a formal model driven approach

... 1.8 NA NA NA 17.34 NA {RX,TX}={OMNI,OMNI} NA NA NA 11.35 NA {RX,TX}={OMNI,DIR} NA NA 7.71 NA {RX,TX}={DIR,DIR} NA NA NA NLOS NA NA NA 13 LOS NA NA NA NA NA NA 10 NA NA NA 8.5 NA NLOS NA NA NA 16.2 ... Office/Laboratory (60) Office/Laboratory NA 2.41 NA 3.26 NA LOS NA 1.6 NA 1.58 NA NA 2.6 NA 6.08 NA NA 1.3 NA 2.6 NA NLOS NA 2.3 NA 2.4 NA LOS NA 1.3 NA 2.8 NA NA 2.4 NA 5.1 NA LOS 53.7 1.62 NA 1.7 NA ... 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...

Ngày tải lên: 29/06/2014, 13:20

... 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, ... 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...

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 ... 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 ... coefficient and radiation patterns of the antenna under test have been measured in anechoic chamber using a 2-port Agilent N523 0A Directive Ultra-Wideband Planar Antennas PNA-L network analyzer, a Satimo...

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 ... spiral antenna, IRE Transactions on Antennas and Propagation, Vol 7, No 2, pp 181-187, ISSN: 0018-926X Gopikrishnaa M.; Krishna D D.; Aanandan C K.; Mohanan P & Vasudevan K (2008) Compact linear ... California, United States, Vol 3, June 20-25, 2008, Piscataway, N.J Krishna D D.; Gopikrishna M.; Aanandan C K.; Mohanan P & Vasudevan K (2009) Ultrawideband slot antenna with band-notch characteristics...

Ngày tải lên: 21/06/2014, 11:20

... model of a 8x2 dual band antenna array Patch Antennas and Microstrip Lines 57 Fig 10 VSWR characteristics of the full model and the reduced model of a 4x4 broadband antenna array using a quarter ... Patch antenna array modelled as (a) full and (b) reduced model As mentioned earlier, the greatest drawback of a patch antenna is its narrow bandwidth Steps were taken to broaden the antenna bandwidth ... using a quarter wave transformer: (a) Schematic 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...

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 ... it was shown that the AWSA could be modeled as a shunt conductance in the annular line As the first step to the study of an AWSA, the annular waveguide was compared with the rectangular waveguide...

Ngày tải lên: 21/06/2014, 11:20

... et 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 ... cases In case 1, suppose that an MRLA of n antennas (MRLA1 with the maximum spacing N) are arranged in the array configuration of an MRLA of m antennas (MRLA2 with the maximum spacing M) As a ... triangular-shape 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...

Ngày tải lên: 21/06/2014, 11:20

... 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 = Aax ... 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 ... J Villacorta1 and Mariano Raboso2 Universidad de Valladolid (Departamento de Teor a de la Señal y Comunicaciones e Ingenier a Telemática) Spain Universidad Pontificia de Salamanca (Escuela Universitaria...

Ngày tải lên: 21/06/2014, 11:20

... It can be seen that in CS a light-wave is launched by a laser diode operating at CW mode and then phase-modulated in an extennal phase modulator by a microwave signal at frequency fs with a large ... makes grating lobes appearance more gradual and less abrupt than in the omnidirectional case This is an improvement in array performance, but it is also a problem because it can be even greater ... 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,...

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 ... specific attenuation of rain from raindrop size distribution models Stochastic model of rain attenuation that can be adopted to generate rain attenuation samples for use in evaluation of fade mitigation ... DSD curves for all rain rate bins Singapore and Surabaya are located in the same region of Southeast Asia and share the same tropical maritime climate Three models fitted to Singapore DSD reported...

Ngày tải lên: 21/06/2014, 11:20

... Different approaches were proposed for bandwidth extension such as fT doubler (Galal & Razavi, 2003), negative impedance converter (Galal & Razavi, 2003), negative Miller capacitance (Galal & Razavi, ... 2003; Mataya et al., 1968), distributed amplifier (DA) (Arbabian & Niknejad, 2008; Chien & Lu, 2007), and inductive peaking technique (Mohan et al., 2000; Galal & Razavi, 2003; Galal & Razavi, ... On-Chip Coplanar Waveguides to Design Local Oscillators for Wireless Communications System 339 oscillator, varacter is connected as a capacitive load to a resonator But the parasitic capacitances of...

Ngày tải lên: 21/06/2014, 11:20

... generalized scattering matrix (Safavi-Naini & MacPhie, 1981; Safavi-Naini & MacPhie, 1982; Eleftheriades et al., 1994) Alternatively, the planar waveguide junction can be characterized using a generalized ... 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 ... 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...

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 ... 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 ... 11(b) show that the gain and flatness are both affected by variations on R Increase of R-value leads to a simultaneous enhancement of the gain value and flatness Then, the phase slope is affected,...

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 ... above achievable resolution, accuracy and measurement capabilities of any magnetron based radar are related tightly to a particular implementation of sampling of the phase of radiated RF pulse...

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

... 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 ... 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 ... Mobile Radio Communications, vol 1, pp 130–134, San Diego, Calif, USA, September 2001 [6] S A Zekavat and C R Nassar, “Smart antenna arrays with oscillating beam patterns: characterization of transmit...

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 ... 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 ... coefficient and radiation patterns of the antenna under test have been measured in anechoic chamber using a 2-port Agilent N523 0A Directive Ultra-Wideband Planar Antennas PNA-L network analyzer, a Satimo...

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., ... Gibson, “The Vivaldi aerial,” in Eur Microw Conf., Oct 1979, pp 101–105 [3] N P Agrawall, G Kumar, and K P Ray, “Wide-band planar monopole antennas,” IEEE Trans Antennas Propag., vol 46, no 2,...

Ngày tải lên: 10/07/2014, 01:20

... 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 angles, we have found an optimal ... "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" ... 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 does not change decreases...

Ngày tải lên: 10/07/2014, 01:20

... 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) ... slot antennas,” IEEE Trans Antennas Propag., vol 56, no 4, pp 1183–1187, Apr 2008 [17] A M Abbosh and M E Bialkowski, “Design of planar ultrawideband planar monopole slot antennas of circular and ... California, in 2008 His main research interests are in small, planar and broadband antennas including ultrawideband antennas for handheld wireless applications Authorized licensed use limited to: Phan...

Ngày tải lên: 10/07/2014, 01:20