a perspective from design for reliability and manufacturability utilizing simulations

... performance of precision range and direction measurements This book offers basic as well as advanced research materials for antennas and propagation It has taken a theoretical and experimental approach ... Planar Monopole Antenna with Dual Band Rejection Characteristics Woo Chan Kim and Woon Geun Yang 231 Chapter 13 Design of a CPW-Fed Dual Band-Notched Planar Wideband Antenna for UWB Applications ... Haider, P Aubry, A Szilagyi, I.E Lager, A Yarovoy and L.P Ligthart VII Preface Ultra wideband (UWB) has advanced and merged as a technology, and many more people are aware of the potential for this...

Ngày tải lên: 29/06/2014, 13:20

... Chương 2: Boadband Planar Monopole Antennas Do thời gian có hạn nên em tìm hiểu sơ qua lý thuyết anten nói chung Boadband Planar Monopole Antennas nói riêng, đồng thời thiết kế mô anten đơn giản ... Planar Monopole Antenna, thể Hình 2.1(c) Hình 2.1: (a) MSA treo không khí, (b) S a đổi nguồn cấp liệu MSA, (c) Planar Monopole Antenna Planar Monopole Antennas có BW lớn, giải thích hai cách sau ... Planar Monopole Antennas: D a việc phân tích anten khác mục trên, từ ta thiết kế ví dụ Planar Monopole Antennas trình bày sau: 2.6.1 Planar Monopole Antennas cho 225-400 MHz : Trong ví dụ sau,...

Ngày tải lên: 21/08/2015, 16:38

... Gholamreza Askari, Khatereh Ghasemi and Hamid Mirmohammad Sadeghi Novel Polarization-Agile Annular Waveguide Slot Antennas 109 Siamak Ebadi and Keyvan Forooraghi Reconfigurable radiation pattern antennas ... intensity and attenuation for the design and evaluation of microwave and millimeter-wave communication systems 271 Gamantyo Hendrantoro and Akira Matsushima 15 High-Temporal Global Rainfall Maps from ... significant and among its potential applications, high-resolution radar and short-range ultra-high speed data transmission are very attractive In this scenario, design, fabrication and characterization...

Ngày tải lên: 21/06/2014, 11:20

... Electrical Engineers, London Angelopoulos E S.; Anastopoulos A Z.; Kaklamani D I.; Alexandridis A A.; Lazarakis F & Dangakis K (2006) Circular and elliptical CPW-fed slot and microstrip-fed antennas ... Naghshvarian-Jahromi M and Falahati A (2008) Classic Miniature Fractal Monopole Antennae for UWB Applications; Modification of The Feeding Structures of Fractal Antenna for Improving Performances, ... dipole antenna from the cone antenna Except that, the folded bowtie antenna in Fig 9, also called sectorial loop antennas (SLA) is suitable for UWB antenna (Behdad & Sarabandi, 2005) Its preformance...

Ngày tải lên: 21/06/2014, 11:20

... achieve a dual band, the antenna array is designed such that for a 16 patch configuration, half the number of patches i.e patches are designed to radiate at 1.9 GHz and the remaining patches are designed ... Broadband Antenna Array It was seen in section 5.1 that for an x patch antenna array, the use of different patch size combinations were used for a dual band antenna In this section all antenna ... diagram and (b) discretised model 5.3 Results of a Dual band and Broad band Antenna Array The VSWR and S11 are obtained using the full-wave MoM and the reduced model for the above designed dual band...

Ngày tải lên: 21/06/2014, 11:20

... Novel Polarization-Agile Annular Waveguide Slot Antennas 109 x Novel Polarization-Agile Annular Waveguide Slot Antennas Siamak Ebadi and Keyvan Forooraghi Microwave Lab., Tarbiat Modares University ... X-Band 83 x A Complete Practical Ultra wideband Test Bed in X-Band Gholamreza Askari, Khatereh Ghasemi and Hamid Mirmohammad Sadeghi Isfahan University of Technology (Information and Communication ... radiation, and as short and closely matched in length as possible Additionally, a good transition should be easy to fabricate, mechanically robust, and insensitive to ambient temperature variations...

Ngày tải lên: 21/06/2014, 11:20

... al., 2009d] 3.2 Minimum Redundancy Planar Arrays The main advantage of planar arrays over linear arrays in ASR is that planar arrays can provide the instantaneous spatial frequency coverage for ... array Y-shape array was adopted in MIRAS [Martín-Neira & Goutoule, 1997] for two-dimensional imaging of the Earth There are several variations for Y-shape array Staggered-Y array was proposed for ... configuration, and optimization algorithms can also be applied to the Reuleaux triangle array to achieve a more uniform (u, v) coverage within a circular area Antenna Array Design in HUST-ASR The...

Ngày tải lên: 21/06/2014, 11:20

... interval from m to m Note that the change of antenna impedance due to height variation may cause also additional error in mismatch between antenna and receiver Broadband antennas have radiation patterns ... expressed as error of antenna factor AF: AF  AFh  AFFS (7) where AFFS is antenna factor of antenna in free space and AFh antenna factor of the same antenna, calculated by the same conditions, in the ... for planar scanning The plane wave spectrum of the measurement Am, as definite previously, is the scalar product of the plane wave spectra of the tested antenna Aa and the probe Ap: Am = Aa Ap...

Ngày tải lên: 21/06/2014, 11:20

... sweeping signal In this way, a mm-wave at frequency 2nfs is generated which can be picked up using a narrowband band-pass filter and amplified for radiating into the air via an antenna In this scheme, ... arrays of randomly spaced antennas, IEEE Transactions on Antennas and Propagation, Vol AP-20, No 3, (May 1972) 288-295, ISSN 1045-9243 J Bae, K Kim, and C Pyo (2005) Design of Steerable Linear and ... Modern UWB antennas and equipment will be amplified and radiated into the air via an antenna In uplink, the 38-GHz signal from the antenna is amplified by a low noise amplifier (LNA) and then mixed...

Ngày tải lên: 21/06/2014, 11:20

... measurement using rain radar can be done, as exemplified by Tan and Goddard (1998) and Hendrantoro and Zawadzki (2003) Radar has its strength in large observation area and feasibility of simulating ... o C ) and (b) Real and Imaginary parts of relative permittivity r Measurement and modeling of rain intensity and attenuation for the design and evaluation of microwave and millimeter-wave communication ... Indonesia and Kumamoto University, Japan The research is aimed at devising transmission strategies suitable for broadband wireless access in microwave and millimeter-wave bands, especially in tropical...

Ngày tải lên: 21/06/2014, 11:20

... compares the square and octagonal inductors for the inductance and Q based on EM simulations With the same chip area (100 m 100 m), the octagonal design has a slightly smaller overall length and ... (OC-1536), and the demands increase as well for these amplifiers with a bandwidth up to microwave and millimeter frequency range Another main application of broadband amplifiers is for wireless ... The gate-source capacitance Cgs and gate-drain capacitance Cgd are important to the high frequency response of the transistor The capacitances Csb and Cdb represent the paracitic capacitances...

Ngày tải lên: 21/06/2014, 11:20

... communication and radar sensor applications Various millimeter-wave multi-port circuits covering the Ka, V and W bands are presented and analyzed In addition, a Ka band demodulator and a W-band radar ... due to relative movements between transmitter and receiver After low pass filtering (LPF) and baseband amplification (BBA), the quadrature baseband demodulated signals are obtained at the outputs ... components as wave-guide antennas, attenuator (Att), phase shifter (PhSh) and a baseband module to generate I/Q signals according to multi-port theory (Moldovan et al., 2007) The metallic target is placed...

Ngày tải lên: 21/06/2014, 11:20

... were made for a Gaussian wave pulse (8.4 ns as standard deviation) modulating a 622 MHz carrier This signal was provided by a vector signal generator Rhode & Schwarz SMJ 10 0A and measured with a ... typically provides admittance matrices In this way, a wideband cascade connection of Y matrices can be applied References Alessandri, F., G Bartolucci, and R Sorrentino (1988), Admittance matrix formulation ... the case of a 622-MHz carrier modulated by a Gaussian input (about 8.4 ns as standard deviation) Figs show that the measured output behaves as a Gaussian pulse and is slightly compressed because...

Ngày tải lên: 21/06/2014, 11:20

... availability and assortment, which decreases actually generally at the time being due to, essentially, a shortage in demand from non-radar application Certainly we not mean a fantastic breakthrough ... practically always to build any modulator Instead the limitations for currently available powerful MOSFETs in the maximal rated voltage, makes inevitable utilizing a stack arranged from many transistors ... mag gnetron based rad dar Magnetron Based Radar Systems for Millimeter Wavelength Band – Modern Approaches and Prospects 473 It does not require a great accuracy and may be implemented relatively...

Ngày tải lên: 21/06/2014, 11:20

... Low-Pass Filter MSA Microstrip Antenna MS-LPDA Microstrip – Log Periodic Dipole Array PAM Pulse Amplitude Modulation PCS Personal Communications Service PPM Pulse Position Modulation RMSA Rectangular ... Conference of Postal and Telecommunications DSP Digital Signal Processing EIRP Equivalent Isotropically Radiated Power FCC Federal Communication Commission FNBW First Null BeamWidth GPS Global Positioning ... Position Modulation RMSA Rectangular Microstrip Antenna SNR Signal – to – Noise Ratio SWR Standing Wave Ratio TH Time Hopping UWB Ultra – Wide Band Trang SVTH : NGUYỄN HOÀI ANH GVHD : Th.S NGUYỄN DƯƠNG...

Ngày tải lên: 22/06/2014, 14:47

... diversity and enhance performance The benchmark for comparison in this work is a CI/DSCDMA system employed in conjunction with a conventional smart antenna array (an antenna array which creates an adaptive ... CI/DS-CDMA with traditional smart antenna arrays When compared to traditional DS-CDMA with RAKE reception (e.g., [8]) combined with a conventional smart antenna array, even larger performance gains are ... Independent fades Movement of the antenna array beam pattern based on the time-varying antenna array phases in (5) or (6) results in a time varying channel, and rate of variation of the channel is measured...

Ngày tải lên: 23/06/2014, 01:20

... Gholamreza Askari, Khatereh Ghasemi and Hamid Mirmohammad Sadeghi Novel Polarization-Agile Annular Waveguide Slot Antennas 109 Siamak Ebadi and Keyvan Forooraghi Reconfigurable radiation pattern antennas ... intensity and attenuation for the design and evaluation of microwave and millimeter-wave communication systems 271 Gamantyo Hendrantoro and Akira Matsushima 15 High-Temporal Global Rainfall Maps from ... significant and among its potential applications, high-resolution radar and short-range ultra-high speed data transmission are very attractive In this scenario, design, fabrication and characterization...

Ngày tải lên: 27/06/2014, 01:21

... Chen and M Y W Chia, Broadband Planar Antennas: Design and Applications Hoboken, NJ: Wiley, Feb 2006 [15] N Herscovici, A wide-band single-layer patch antenna,” IEEE Trans Antennas Propag., ... patches,” Electron Lett., vol 23, pp 606–607, May 1987 [9] F Yang, X Zhang, X Ye, and Y Rahmat-Samii, “Wide-band E-shaped patch antennas for wireless communications,” IEEE Trans Antennas Propag., ... ground plane It can be seen that there are minimal changes to the impedance matching and gain profile Therefore this design has a good mechanical tolerance due to the low Q value of the antenna Furthermore,...

Ngày tải lên: 10/07/2014, 01:20

... "Microwave Imaging via space-time beamforming for early detection of breast cancer" IEEE Trans on Antennas and Prop Vol 51.N°8 August 2003 Pp 1690-1705 [3] M Barnes "Ultra-Wideband Magnetic Antenna" ... obtained from (1) for 6GHz, several simulations were made changing the W/L ratio We found that increasing slot dimensions the matching bandwidth increases and the frequency band where radiation pattem ... change decreases In order to get an ultra-wide matching band maintaining the broadside maximum radiation, a longer slot bent across H-plane is proposed, as figure I shows After studying several...

Ngày tải lên: 10/07/2014, 01:20

... University, San Diego, California, in 2008 His main research interests are in small, planar and broadband antennas including ultrawideband antennas for handheld wireless applications Authorized licensed ... the radiation patterns of the antenna Design B within the UWB range obtained using the HFSS simat plane and at ulations The co-polarization ( plane) and cross-polarization ( at plane at plane) ... addition to several academic and industrial technical reports He also holds one U.S and one Canadian patent His main research interests are in microstrip antennas, ultrawide bandwidth antennas,...

Ngày tải lên: 10/07/2014, 01:20