Phase Error Effects on the Radiation Patterns of Space-Fed Planar Phased Arrays, (9999)
The effects of the quantization and collimation phase errors on the radiation patterns of planar phased arrays fed optically through radar horns, are discussed in this paper. Based on the results...
On the Quasi-Periodic Microstrip Snake Antenna with Metal Trough Backing, (9999)
This study tackles the radiation mechanism of a microstrip with a quasi-periodic undulation supported inside a metal trough of a rectangular cross section that acts as a choke on the closed side and...
Ghosh, B, Simons, NRS, Shafai, L, Ittipboon, A, Petosa, A
This paper presents a full-wave modal analysis of several typical components based on a nonradiative dielectric (NRD) waveguide technology using the transmission line matrix (TLM)-based modal...
Ghosh, B, Simons, NRS, Shafai, L, Ittipboon, A, Petosa, A
This paper presents a full-wave modal analysis of several typical components based on a nonradiative dielectric (NRD) waveguide technology using the transmission line matrix (TLM)-based modal...
Multiple phase center performance of reflector antennas using a dual mode horn (2006)
Shafai, L, Sharma, SK, Balaji, B, Damini, A, Haslam, G
A new application for reflector antennas is proposed and developed. Using the aperture theory, a phase center on the reflector aperture is determined and shown that, its location is dependent on the...
Multiple phase center performance of reflector antennas using a dual mode horn (2006)
Shafai, L, Sharma, SK, Balaji, B, Damini, A, Haslam, G
A new application for reflector antennas is proposed and developed. Using the aperture theory, a phase center on the reflector aperture is determined and shown that, its location is dependent on the...
Phase shift bandwidth and scan range in microstrip arrays by the element frequency tuning (2006)
Shafai, L, Sharma, SK, Shafai, L, Daneshmand, M, Mousavi, P
In this paper, the far-field phase shift properties of microstrip patch antennas are investigated. It is shown that, similar to reflectarrays, the resonant nature of microstrip patches can be used to...
Phase shift bandwidth and scan range in microstrip arrays by the element frequency tuning (2006)
Shafai, L, Sharma, SK, Shafai, L, Daneshmand, M, Mousavi, P
In this paper, the far-field phase shift properties of microstrip patch antennas are investigated. It is shown that, similar to reflectarrays, the resonant nature of microstrip patches can be used to...
Beam focusing properties of circular monopole array antenna on a finite ground plane (2005)
This paper presents the investigation results on the beam focusing properties of a wire circular monopole array (CMA) antenna consisting of six-elements on a finite ground plane, by exciting more...
Beam focusing properties of circular monopole array antenna on a finite ground plane (2005)
This paper presents the investigation results on the beam focusing properties of a wire circular monopole array (CMA) antenna consisting of six-elements on a finite ground plane, by exciting more...
Bandwidth enhancement and size reduction of microstrip slot antennas (2005)
Latif, SI, Shafai, L, Sharma, SK
Reduced size microstrip monopole slot antennas with different slot shapes-straight, L and inverted T, and placed on a small ground plane, are investigated. The ground plane size is 50 mm x 80 mm,...
Bandwidth enhancement and size reduction of microstrip slot antennas (2005)
Latif, SI, Shafai, L, Sharma, SK
Reduced size microstrip monopole slot antennas with different slot shapes-straight, L and inverted T, and placed on a small ground plane, are investigated. The ground plane size is 50 mm x 80 mm,...
This paper presents the investigations on a miniaturized vertically polarized traveling wave antenna for operation in the high frequency band (3-6 MHz), with a specific requirement of keeping its...
This paper presents the investigations on a miniaturized vertically polarized traveling wave antenna for operation in the high frequency band (3-6 MHz), with a specific requirement of keeping its...
Investigation of wide-band microstrip slot antenna (2004)
Sharma, SK, Shafai, L, Jacob, N
This paper presents the simulation and experimental investigations of a printed microstrip slot antenna. It is a quarter wavelength monopole slot cut in the finite ground plane edge, and fed...
Investigation of wide-band microstrip slot antenna (2004)
Sharma, SK, Shafai, L, Jacob, N
This paper presents the simulation and experimental investigations of a printed microstrip slot antenna. It is a quarter wavelength monopole slot cut in the finite ground plane edge, and fed...
Microstrip phase shifter using ground-plane reconfiguration (2004)
Shafai, C, Sharma, SK, Shafai, L, Chrusch, DD
In this paper, a new reconfigurable microstrip structure is presented where line impedance can be actively controlled to induce phase shift on a transmission-line signal. Micromachining is used to...
Microstrip phase shifter using ground-plane reconfiguration (2004)
Shafai, C, Sharma, SK, Shafai, L, Chrusch, DD
In this paper, a new reconfigurable microstrip structure is presented where line impedance can be actively controlled to induce phase shift on a transmission-line signal. Micromachining is used to...
Small reflector antenna with low sidelobes (2003)
A prime focus low sidelobe parabolic reflector antenna with self-supported feed is designed for low sidelobe, applications. The parabolic reflector diameter is between I nine and 12 wavelengths. A...
Small reflector antenna with low sidelobes (2003)
A prime focus low sidelobe parabolic reflector antenna with self-supported feed is designed for low sidelobe, applications. The parabolic reflector diameter is between I nine and 12 wavelengths. A...
Characteristics and design of the LAR offset system with feed-reflector (2003)
Mousavi, P, Shafai, L, Veidt, B, Daneshmand, M, Dewdney, P
A novel approach for analyzing the quasi-optical offset Large Adaptive Reflector (LAR) Cassegrain system is described. In this system a Feed-Reflector is used to illuminate a reconformable...
Characteristics and design of the LAR offset system with feed-reflector (2003)
Mousavi, P, Shafai, L, Veidt, B, Daneshmand, M, Dewdney, P
A novel approach for analyzing the quasi-optical offset Large Adaptive Reflector (LAR) Cassegrain system is described. In this system a Feed-Reflector is used to illuminate a reconformable...
Ghosh, B, Simons, NRS, Shafai, L, Ittipiboon, A, Petosa, A
This paper describes the development of a rigorous transmission-line matrix-based modal-extraction approach to analyze discontinuities in guided-wave structures in general, with particular attention...
Ghosh, B, Simons, NRS, Shafai, L, Ittipiboon, A, Petosa, A
This paper describes the development of a rigorous transmission-line matrix-based modal-extraction approach to analyze discontinuities in guided-wave structures in general, with particular attention...
Tavakkol-Hamedani, F, Tavakoli, A, Shafai, L
Two techniques based on electric and magnetic field integral equation (EFIE and MFIE) formulations of surface equilalent principle and multiple network theory (SEMN) method are developed for the...
Tavakkol-Hamedani, F, Tavakoli, A, Shafai, L
Two techniques based on electric and magnetic field integral equation (EFIE and MFIE) formulations of surface equilalent principle and multiple network theory (SEMN) method are developed for the...
Feed-Reflector design for large adaptive reflector antenna (LAR) (2001)
Mousavi, P, Shafai, L, Veidt, B, Dewdney, P
A novel Feed-Reflector system for large Cassegrain antennas of radio astronomy and deep-space communication applications is investigated. This Feed-Reflector is used to illuminate a hyperboloid...
Feed-Reflector design for large adaptive reflector antenna (LAR) (2001)
Mousavi, P, Shafai, L, Veidt, B, Dewdney, P
A novel Feed-Reflector system for large Cassegrain antennas of radio astronomy and deep-space communication applications is investigated. This Feed-Reflector is used to illuminate a hyperboloid...
Dispersion characteristics of grooved microstrip line (GMSL) (2000)
Chamma, W, Gupta, N, Shafai, L
In this paper, the method of lines and finite-difference time-domain numerical methods are used to investigate the field distribution, dispersion, and impedance characteristics of the grooved...
Dispersion characteristics of grooved microstrip line (GMSL) (2000)
Chamma, W, Gupta, N, Shafai, L
In this paper, the method of lines and finite-difference time-domain numerical methods are used to investigate the field distribution, dispersion, and impedance characteristics of the grooved...
Experimental Study of Parasitically Steered, Fixed Beam Microstrip Patch Arrays (1997)
Gray, D.P., Lu, Junwei, Shafai, L.
The linearly polarised single feed point Yagi microstrip patch array was previously developed from the concept of the thin wire Yagi-Uda array. It is possible to build either vertically polarised or...
Experimental Study of Parasitically Steered, Fixed Beam Microstrip Patch Arrays (1997)
Gray, D.P., Lu, Junwei, Shafai, L.
The linearly polarised single feed point Yagi microstrip patch array was previously developed from the concept of the thin wire Yagi-Uda array. It is possible to build either vertically polarised or...