Search
Now showing items 1-10 of 14
Small reflector antenna with low sidelobes
(2003-10-31)
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 simple design is achieved ...
Multiple phase center performance of reflector antennas using a dual mode horn
(2006-11-30)
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 field distribution. The ...
Phase shift bandwidth and scan range in microstrip arrays by the element frequency tuning
(2006-05-31)
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 change the phase of ...
Analysis of NRD waveguide-based components and transitions using the TLM-based modal extraction approach
(2006-12-31)
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 extraction approach (TMEA) for ...
Bandwidth enhancement and size reduction of microstrip slot antennas
(2005-03-31)
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, which is about the size ...
TLM-based modal-extraction approach for the investigation of discontinuities in the rectangular waveguide and the NRD
(2002-10-31)
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 to the nonradiative ...
Analysis of finite-micro strip structures using surface equivalence principle and multiple network theory (SEMN)
(2002-08-31)
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 analysis of finite microstrip ...
Characteristics and design of the LAR offset system with feed-reflector
(2003-07-31)
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 hyperboloid subreflector with 5 ...
Investigation of wide-band microstrip slot antenna
(2004-03-31)
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 electromagnetically by a ...
Microstrip phase shifter using ground-plane reconfiguration
(2004-01-31)
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 fabricate thin-film copper ...