LỜI CAM ĐOAN Em xin cam đoan nội dung đồ án chép đồ án cơng trình có từ trước Đà Nẵng, tháng năm 2014 Sinh viên thực Nguyễn Thanh Hằng TIEU LUAN MOI download : skknchat@gmail.com MỤC LỤC LỜI CAM ĐOAN 01 MỤC LỤC 02 DANH MỤC CÁC TỪ VIẾT TẮT 05 DANH MỤC CÁC HÌNH ẢNH 06 LỜI MỞ ĐẦU 08 Chương 1: TỔNG QUAN VỀ ANTEN 11 1.1 Giới thiệu chương 11 1.2 Giới thiệu anten 11 1.3 Một vài loại anten 13 1.3.1 Anten dây 13 1.3.2 Anten miệng 14 1.3.3 Anten vi dải 15 1.4 Các thông số anten 16 1.4.1 Băng thông 16 1.4.2 Phân cực sóng 17 1.4.2.1 Phân cực thẳng 19 1.4.2.2 Phân cực tròn 19 1.4.2.3 Phân cực elip 20 TIEU LUAN MOI download : skknchat@gmail.com 1.4.3 Trở kháng vào 21 1.4.4 Mơ hình xạ 22 1.4.5 Hệ số định hướng 23 1.4.6 Độ lợi 24 1.5 Kết luận chương 26 Chương 2: ANTEN VI DẢI 27 2.1 Giới thiệu chương 27 2.2 Anten vi dải 27 2.2.1 Giới thiệu chung 27 2.2.2 Một số loại anten vi dải 29 2.2.2.1 Anten patch vi dải 29 2.2.2.2 Anten dipole vi dải 30 2.2.2.3 Anten khe mạch in 31 2.2.2.4 Anten sóng chạy vi dải 31 2.3 Anten PIFA 32 2.4 Kết luận chương 33 Chương 3: MÔ PHỎNG ANTEN PIFA CHO THIẾT BỊ DI ĐỘNG 3G 35 3.1 Giới thiệu chương 35 3.2 Mô anten đơn giản 35 TIEU LUAN MOI download : skknchat@gmail.com 3.2.1 Anten đơn cực 35 3.2.2 Anten chữ L 37 3.2.3 Anten chữ F 39 3.3 Mô anten PIFA 40 3.3.1 Giới thiệu sơ lược 40 3.3.2 Những yêu cầu anten cho thiết bị di động 3G 41 3.3.3 Cấu trúc anten PIFA 42 3.3.4 Một phương pháp cải thiện cấu trúc anten 45 3.3.5 Cấu trúc anten sau cải tiến 50 3.4 Kết luận chương 53 KẾT LUẬN VÀ HƯỚNG PHÁT TRIỂN ĐỀ TÀI 54 TÀI LIỆU THAM KHẢO 55 DANH MỤC CÁC BÀI BÁO ĐÃ NỘP 56 PHỤ LỤC 57 TIEU LUAN MOI download : skknchat@gmail.com 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ong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2: DANH MỤC CÁC TỪ VIẾT TẮT A AR Tỉ lệ bán trục Axial Ratio B BW Băng thông Bandwidth C CW CCW HFSS PIFA VSWR Clockwise Counterclockwise Quay theo chiều kim đồng hồ Quay ngược chiều kim đồng hồ H High Frequency Structural Simulator Phần mềm mô trường điện từ P Planar Inverted F Antenna Anten phẳng dạng chữ F ngược V Voltage Standing Wave Ratio Tỉ số điện áp sóng đứng TIEU LUAN MOI download : skknchat@gmail.com 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ong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2: DANH MỤC CÁC HÌNH ẢNH Hình 1.1: Mạch tương đương cho hệ thống anten phát 11 Hình 1.2: Các cấu hình anten dây 14 Hình 1.3: Các cấu hình anten miệng 15 Hình 1.4: Các hình dạng patch phần tử vi dải 16 Hình 1.5: Các patch anten hình chữ nhật hình trịn 16 Hình 1.6: Sự quay sóng điện từ phân cực elip 18 Hình 1.7: Hệ thống tọa độ để phân tích anten 23 Hình 2.1: Cấu trúc anten vi dải đơn giản 28 Hình 2.2: Các hình dạng anten patch vi dải thường dùng thực tế 29 Hình 2.3: Các hình dạng kiểu khác cho anten patch vi dải 30 Hình 2.4: Một vài dạng dipole vi dải 30 Hình 2.5: Một số anten khe mạch in với cấu trúc tiếp điện 31 Hình 2.6: Một vài cấu hình anten sóng chạy vi dải mạch in 32 Hình 2.7: Anten chữ F ngược 33 Hình 3.1: Anten đơn cực 36 Hình 3.2: Kết mơ VSWR trở kháng vào anten đơn cực 37 Hình 3.3: Anten chữ L 38 TIEU LUAN MOI download : skknchat@gmail.com 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ong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2: Hình 3.4: Kết mơ VSWR trở kháng vào anten chữ L 38 Hình 3.5: Anten chữ F 39 Hình 3.6: Kết mơ VSWR trở kháng vào anten chữ F 40 Hình 3.7: Anten PIFA 43 Hình 3.8: Kết mô VSWR trở kháng vào 45 Hình 3.9: Anten PIFA sau hạ chiều cao h 46 Hình 3.10: Kết mơ VSWR anten PIFA sau hạ chiều cao chất thay đổi đoạn l9 47 Hình 3.11: Anten PIFA sau phân khe 48 Hình 3.12: Kết mơ VSWR anten PIFA sau thay đổi w3 chiều dài mặt phẳng đất 49 Hình 3.13: Anten PIFA sau cải tiến 50 Hình 3.14: VSWR trở kháng vào anten PIFA sau cải tiến 52 TIEU LUAN MOI download : skknchat@gmail.com 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ong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2: DANH MỤC BÀI BÁO ĐÃ NỘP T T Huong, N T Hang, “Design enhancements of PIFA for 3G mobile device” (Đã nộp chờ kết quả) 56 TIEU LUAN MOI download : skknchat@gmail.com Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuon g.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2: Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chu ong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2: PHỤ LỤC Mô VSWR trở kháng vào anten đơn cực f = 1.8:0.01:2.2; VSWR= [3.062078798 2.937150169 2.813627665 2.69200119 2.57274264 2.456304154 2.343117654 2.233596054 2.128136667 2.027127489 1.930957333 1.840031149 1.754792276 1.675753761 1.603540607 1.538942524 1.482969331 1.4368834 1.402153399 1.380250783 1.372260275 1.378450257 1.398101934 1.429747475 1.471624632 1.522052928 1.579613361 1.64317743 1.711866469 1.784994048 1.862014018 1.942480202 2.026017165 2.112299702 2.201038691 2.291971418 2.384855006 2.479461977 2.57557727 2.672996263 2.771523462]; Z=[67.93566619 67.37090734 66.87104131 66.43556125 66.06390673 65.75547842 65.50965079 65.32578316 65.2032291 65.14134458 65.13949482 65.19706009 65.31344055 65.48806029 65.72037062 66.00985271 66.3560197 66.75841825 67.2166298 67.73027131 68.29899573 68.92249227 69.60048624 70.33273886 71.11904674 71.95924124 72.85318765 73.8007843 74.80196138 75.85667983 76.96492994 78.12672995 79.34212445 80.61118277 81.93399709 83.31068062 84.7413655 86.22620063 87.76534939 89.35898711 91.00729848]; subplot(2,1,1) plot (f,VSWR,'k','linewidth',1.8); grid on axis ([1.8 2.2 1.2 2]) xlabel('Frequency (GHz)') ylabel('VSWR') title('Ket qua mo phong VSWR cua anten don cuc') subplot(2,1,2) plot (f,Z,'k','linewidth',1.8); grid on axis([1.8 2.2 60 100]) xlabel('Frequency (GHz)') ylabel('Z (Ohm)') title('Ket qua mo phong tro khang vao cua anten don cuc') Mô VSWR trở kháng vào anten chữ L f = 1.8:0.01:2.2; VSWR = [2.982837871 2.853808671 2.727882651 2.605423378 2.48676473 2.372211993 2.262044232 2.156518228 2.055874353 1.96034489 1.87016553 1.785590967 1.706915786 1.63450181 1.568812364 1.510451292 1.460197859 1.41901526 1.387992064 1.36816973 1.360254939 1.364327983 1.379736859 1.405264266 1.439447422 1.480860059 1.528265098 1.580655123 1.637232641 1.697370034 1.760569313 1.826428794 1.894617731 1.964857763 2.036909619 2.110563653 2.185633104 2.261949284 2.339358093 2.417717465 2.496895427]; Z=[61.30718465 61.12849861 61.00462261 60.93474122 60.91805992 60.95380671 61.04123326 61.17961567 61.36825483 61.60647664 61.89363189 62.22909601 62.61226868 63.04257328 63.5194563 64.04238662 57 TIEU LUAN MOI download : skknchat@gmail.com Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuon g.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2: Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chu ong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2: 64.61085483 65.22437236 65.88247076 66.58470085 67.33063191 68.11985094 68.95196183 69.82658466 70.74335509 71.70192366 72.70195539 73.74312927 74.82513809 75.94768824 77.11049983 78.31330691 79.55585806 80.83791715 82.1592644 83.51969785 84.91903493 86.35711444 87.83379848 89.34897434 90.90255586]; subplot(2,1,1) plot (f,VSWR,'k','linewidth',1.8); grid on axis ([1.8 2.2 1.2 2]) xlabel('Frequency (GHz)') ylabel('VSWR') title('Ket qua mo phong VSWR cua anten chu L') subplot(2,1,2) plot (f,Z,'k','linewidth',1.8); grid on axis([1.8 2.2 60 100]) xlabel('Frequency (GHz)') ylabel('Z (Ohm)') title('Ket qua mo phong tro khang vao cua anten chu L') Mô VSWR trở kháng vào anten chữ F f = 1.8:0.01:2.2; VSWR = [2.949581865 2.821982848 2.697149932 2.575461474 2.457266859 2.342886972 2.232615939 2.126724452 2.025465125 1.929080493 1.837814615 1.751929611 1.671729077 1.59759091 1.530012247 1.469667488 1.417472995 1.374631923 1.342594146 1.322830707 1.316379683 1.323353347 1.34279159 1.373007615 1.412125502 1.458459326 1.510652051 1.567665078 1.628714465 1.693203628 1.76066902 1.830740516 1.903113805 1.97753149 2.05377023 2.13163198 2.210938001 2.29152472 2.373240823 2.455945172 2.539505226]; Z=[61.61742344 61.33175103 61.10130879 60.92522277 60.80263185 60.7326908 60.71457278 60.74747113 60.83060079 60.96319924 61.14452718 61.37386884 61.65053215 61.9738486 62.34317309 62.7578835 63.21738027 63.72108585 64.26844407 64.85891953 65.49199685 66.16718007 66.88399187 67.64197291 68.44068121 69.27969146 70.15859453 71.07699701 72.03452077 73.03080283 74.06549529 75.13826549 76.24879651 77.39678794 78.58195704 79.80404041 81.06279603 82.35800581 83.68947847 85.05705253 86.46059892]; subplot(2,1,1) plot (f,VSWR,'k','linewidth',1.8); grid on axis ([1.8 2.2 1.2 2]) xlabel('Frequency (GHz)') ylabel('VSWR') title('Ket qua mo phong VSWR cua anten chu F') subplot(2,1,2) plot (f,Z,'k','linewidth',1.8); grid on axis([1.8 2.2 50 90]) xlabel('Frequency (GHz)') 58 TIEU LUAN MOI download : skknchat@gmail.com Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuon g.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2: Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chu ong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2: ylabel('Z (Ohm)') title('Ket qua mo phong tro khang vao cua anten chu F') Mô VSWR trở kháng vào anten PIFA f = 1.7:0.02:2.3; VSWR= [2.488171271 2.333122012 2.188481241 2.0535797 1.927786292 1.810508959 1.701195507 1.599335061 1.504461352 1.416160448 1.334089426 1.258025005 1.188009016 1.124892393 1.07314359 1.054842987 1.088648656 1.142837547 1.203879191 1.269005296 1.337421066 1.408812753 1.483018632 1.559930941 1.639459832 1.721518053 1.806013823 1.892847458 1.981909997 2.073083121 2.166240063]; Z=[50.0957684 49.20528648 48.44485415 47.80350798 47.27233416 46.84417551 46.513403 46.27573955 46.1281269 46.06862902 46.09636713 46.21148318 46.41512984 46.70948642 47.09780094 47.58445995 48.17508893 48.87668705 49.69780212 50.64875293 51.74190854 52.99203674 54.41673671 56.03697468 57.87774485 59.96888151 62.34604956 65.0519383 68.13766994 71.66439915 75.70499993]; subplot(2,1,1) plot (f,VSWR,'k','linewidth',1.8); grid on axis ([1.7 2.31 2]) xlabel('Frequency (GHz)') ylabel('VSWR') title('Ket qua mo phong VSWR cua anten PIFA') subplot(2,1,2) plot (f,Z,'k','linewidth',1.8); grid on axis([1.7 2.31 40 80]) xlabel('Frequency (GHz)') ylabel('Z (Ohm)') title('Ket qua mo phong tro khang vao cua anten PIFA') Mô VSWR anten PIFA sau hạ chiều cao chất thay đổi l9 f = 1.7:0.01:2.3; VSWRA= [3.15376448 3.062368461 2.973829168 2.888059528 2.804974113 2.724489276 2.64652326 2.570996285 2.497830611 2.426950583 2.358282663 2.291755439 2.227299629 2.164848077 2.104335729 2.045699612 1.988878802 1.933814384 1.880449419 1.82872889 1.778599663 1.730010433 1.682911677 1.637255605 1.592996106 1.550088704 1.508490508 1.468160171 1.429057849 1.391145176 1.354385242 1.318742596 1.284183288 1.250674963 1.218187079 1.186691364 1.156162798 1.126581932 1.097941045 1.070264133 1.043697106 1.019298844 1.014245601 1.036905247 1.062584202 1.089159027 1.116379323 1.144180353 1.172539109 1.201446053 1.230896964 1.260889987 1.291424404 1.322500075 1.354117173 1.386276075 1.418977329 1.45222168 1.486010129 1.520344027 1.555225197]; VSWRB1= [1.208996694 1.302063469 1.377418985 1.435228149 1.477579715 1.50684672 1.525244008 1.53470354 1.536860711 1.533080615 1.524496033 59 TIEU LUAN MOI download : skknchat@gmail.com Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuon g.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2: Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chu ong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2: 1.512045783 1.496509187 1.478535529 1.458668673 1.437367484 1.415022832 1.39197193 1.368510752 1.344905165 1.321401452 1.298236863 1.275650893 1.253897957 1.233261992 1.214072927 1.19672335 1.181680242 1.169480838 1.160695737 1.155845446 1.15528152 1.159084763 1.167045613 1.178741109 1.193656116 1.211285234 1.231188641 1.253009001 1.27646673 1.301347088 1.327486252 1.354759214 1.383070184 1.412345291 1.442527145 1.473570808 1.505440813 1.538108944 1.571552569 1.60575338 1.640696429 1.676369377 1.71276191 1.749865268 1.787671874 1.826175019 1.865368612 1.905246954 1.945804557 1.987035977]; VSWRB2= [1.417269054 1.478823852 1.52365097 1.55445226 1.573664176 1.58338327 1.585370771 1.581088463 1.571743221 1.558330259 1.541671372 1.522447256 1.50122425 1.478476273 1.45460282 1.429943863 1.404792382 1.379405217 1.354012843 1.328828679 1.304058585 1.27991125 1.25661031 1.234409068 1.213608456 1.194577817 1.17777502 1.163755822 1.153152161 1.146593136 1.144562227 1.147243177 1.154454898 1.165727309 1.180458849 1.198056498 1.218011253 1.239918346 1.263468456 1.288429391 1.314627721 1.34193361 1.370249254 1.39950039 1.429630133 1.460594535 1.492359362 1.524897732 1.558188377 1.592214348 1.626962027 1.662420377 1.698580354 1.735434447 1.772976302 1.811200425 1.850101925 1.889676304 1.92991927 1.970826578 2.01239388]; VSWRB3= [1.720888935 1.734017618 1.738158854 1.734993309 1.725912573 1.712066289 1.694404576 1.673714267 1.650649044 1.625754179 1.59948675 1.57223218 1.54431786 1.516024487 1.487595667 1.459246256 1.431169846 1.403545762 1.376545947 1.350342087 1.325113305 1.301054741 1.278387112 1.257366937 1.238296161 1.221528156 1.20746452 1.196534647 1.189150862 1.185640613 1.186174382 1.190721827 1.199060824 1.2108345 1.225626372 1.243023561 1.262654986 1.28420672 1.307422694 1.332098273 1.358071561 1.385214872 1.413427373 1.442629092 1.472756209 1.503757396 1.535591006 1.568222904 1.601624794 1.635772914 1.670647021 1.706229578 1.742505115 1.779459702 1.817080526 1.85535553 1.894273121 1.933821909 1.973990491 2.014767251 2.056140195]; subplot(2,1,1) plot (f,VSWRA,'k','linewidth',1.8); grid on axis ([1.7 2.31 2]) xlabel('Frequency (GHz)') ylabel('VSWR') title('Ket qua mo phong VSWR cua anten PIFA sau chieu cao chat nen') subplot(2,1,2) plot (f,VSWRB1,'r.',f,VSWRB2,'k-',f,VSWRB3,'b.'); grid on axis([1.7 2.31 2]) xlabel('Frequency (GHz)') ylabel('VSWR') title('Ket qua mo phong VSWR cua anten PIFA thay doi l9') legend ('l9 = 7.1 mm', 'l9 = 7.6 mm', 'l9 = 8.1 mm') Mô VSWR anten PIFA sau thay đổi w3 chiều dài mặt phẳng đất 60 TIEU LUAN MOI download : skknchat@gmail.com Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuon g.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2: Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chu ong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2: f = 1.7:0.01:2.3; VSWRC1= [1.813599272 1.811049176 1.801664013 1.786795834 1.767553881 1.744849093 1.719431316 1.691919748 1.662827609 1.632582059 1.601540345 1.570002939 1.538224372 1.506422299 1.474785266 1.443479596 1.412655771 1.382454706 1.353014356 1.324477171 1.296999077 1.2707608 1.245982466 1.222942245 1.201998643 1.183612661 1.168358311 1.156897616 1.149888831 1.147820946 1.150839878 1.158686323 1.170797567 1.186491804 1.205119486 1.226136848 1.249119523 1.273747754 1.299784005 1.327052184 1.355421121 1.384792275 1.415090834 1.446259347 1.47825316 1.511037119 1.544583179 1.578868638 1.613874822 1.649586087 1.685989065 1.723072059 1.760824585 1.799236986 1.838300129 1.878005148 1.918343227 1.959305417 2.000882474 2.043064712 2.08584188]; VSWRC2= [1.417269054 1.478823852 1.52365097 1.55445226 1.573664176 1.58338327 1.585370771 1.581088463 1.571743221 1.558330259 1.541671372 1.522447256 1.50122425 1.478476273 1.45460282 1.429943863 1.404792382 1.379405217 1.354012843 1.328828679 1.304058585 1.27991125 1.25661031 1.234409068 1.213608456 1.194577817 1.17777502 1.163755822 1.153152161 1.146593136 1.144562227 1.147243177 1.154454898 1.165727309 1.180458849 1.198056498 1.218011253 1.239918346 1.263468456 1.288429391 1.314627721 1.34193361 1.370249254 1.39950039 1.429630133 1.460594535 1.492359362 1.524897732 1.558188377 1.592214348 1.626962027 1.662420377 1.698580354 1.735434447 1.772976302 1.811200425 1.850101925 1.889676304 1.92991927 1.970826578 2.01239388]; VSWRC3= [4.06722872 3.161297718 2.429306862 1.9169016 1.587681429 1.391744011 1.292799203 1.262660947 1.271147224 1.293666444 1.317297659 1.3369367 1.351065955 1.359631361 1.363136741 1.362265293 1.357722215 1.350172356 1.340219792 1.328406121 1.315217019 1.3010923 1.286437305 1.271634645 1.257055713 1.243071355 1.230060586 1.218415415 1.208538806 1.200832247 1.195670544 1.193365659 1.194128166 1.198040252 1.205052284 1.215004895 1.227667108 1.242776537 1.260071312 1.279310106 1.300281626 1.322806857 1.346737231 1.371950954 1.398348856 1.425850435 1.454390385 1.483915686 1.51438321 1.545757799 1.578010711 1.611118375 1.645061395 1.679823738 1.715392082 1.751755277 1.788903897 1.826829877 1.865526191 1.904986588 1.945205359]; VSWRD1= [1.638458587 1.663921253 1.678576054 1.684379844 1.682962525 1.675672776 1.663624013 1.647735716 1.628768689 1.60735437 1.584018866 1.559202565 1.533276167 1.506553844 1.479304175 1.451759396 1.424123429 1.396579129 1.369295154 1.342432941 1.316154272 1.290630106 1.266051451 1.242643214 1.220681882 1.200517068 1.182594316 1.167470134 1.155798966 1.148261741 1.145419217 1.147534282 1.154474782 1.165774893 1.180804377 1.198930108 1.219606555 1.242401547 1.266987418 1.293120669 1.320621474 1.349356811 1.379227697 1.410159864 1.44209705 1.47499617 1.508823835 1.543553803 1.579165107 1.615640646 1.652966121 1.691129211 1.730118932 1.769925117 1.810538003 1.851947884 1.894144824 1.937118408 1.980857531 2.025350206 2.070583397]; VSWRD2= [1.417269054 1.478823852 1.52365097 1.55445226 1.573664176 1.58338327 1.585370771 1.581088463 1.571743221 1.558330259 1.541671372 1.522447256 1.50122425 1.478476273 1.45460282 1.429943863 1.404792382 61 TIEU LUAN MOI download : skknchat@gmail.com Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuon g.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2: Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chu ong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2: 1.379405217 1.354012843 1.328828679 1.304058585 1.27991125 1.25661031 1.234409068 1.213608456 1.194577817 1.17777502 1.163755822 1.153152161 1.146593136 1.144562227 1.147243177 1.154454898 1.165727309 1.180458849 1.198056498 1.218011253 1.239918346 1.263468456 1.288429391 1.314627721 1.34193361 1.370249254 1.39950039 1.429630133 1.460594535 1.492359362 1.524897732 1.558188377 1.592214348 1.626962027 1.662420377 1.698580354 1.735434447 1.772976302 1.811200425 1.850101925 1.889676304 1.92991927 1.970826578 2.01239388]; VSWRD3= [1.142423079 1.185119802 1.230000188 1.268476988 1.299743919 1.324554318 1.34388016 1.358605881 1.369471699 1.377081319 1.38192412 1.384397686 1.384827073 1.383480403 1.380581316 1.376319006 1.370856579 1.364338455 1.356897513 1.348662567 1.339765533 1.330342017 1.320498584 1.31017975 1.298954468 1.286281138 1.272384838 1.258008961 1.24356734 1.229140485 1.214722116 1.200322626 1.185990228 1.171813875 1.157928008 1.144523807 1.131868099 1.120329279 1.110404268 1.102727385 1.098021994 1.096955111 1.09992526 1.106926557 1.117608536 1.131466054 1.148006841 1.166830576 1.187641353 1.210231712 1.234460948 1.260236226 1.287498288 1.316211165 1.346354891 1.377920315 1.410905332 1.445312098 1.481144881 1.518408373 1.557106302]; subplot(2,1,1) plot (f,VSWRC1,'r.',f,VSWRC2,'k-',f,VSWRC3,'b.'); grid on axis ([1.7 2.31 2]) xlabel('Frequency (GHz)') ylabel('VSWR') title('Ket qua mo phong VSWR cua anten PIFA sau thay doi w3') legend ('w3 = 21 mm', 'w3 = 20.7 mm', 'w3 = 20 mm') subplot(2,1,2) plot (f,VSWRD1,'r.',f,VSWRD2,'k-',f,VSWRD3,'b.'); grid on axis([1.7 2.31 2]) xlabel('Frequency (GHz)') ylabel('VSWR') title('Ket qua mo phong VSWR cua anten PIFA thay doi chieu dai mat phang dat') legend ('L = 80 mm', 'L = 70 mm', 'L = 60 mm') Mô VSWR trở kháng vào anten PIFA sau cải tiến f = 1.7:0.01:2.3; VSWR= [1.417269054 1.478823852 1.52365097 1.55445226 1.573664176 1.58338327 1.585370771 1.581088463 1.571743221 1.558330259 1.541671372 1.522447256 1.50122425 1.478476273 1.45460282 1.429943863 1.404792382 1.379405217 1.354012843 1.328828679 1.304058585 1.27991125 1.25661031 1.234409068 1.213608456 1.194577817 1.17777502 1.163755822 1.153152161 1.146593136 1.144562227 1.147243177 1.154454898 1.165727309 1.180458849 1.198056498 1.218011253 1.239918346 1.263468456 1.288429391 1.314627721 1.34193361 1.370249254 1.39950039 1.429630133 1.460594535 1.492359362 1.524897732 1.558188377 1.592214348 62 TIEU LUAN MOI download : skknchat@gmail.com Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuon g.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2: 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ong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2:Chuong.2: