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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 ...
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 ...
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 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 ...
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 ...
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 ...
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 ...
Investigations on miniaturized endfire vertically polarized quasi-fractal log-periodic zigzag antenna
(2004-08-31)
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 height near 1/8th of a ...
Dispersion characteristics of grooved microstrip line (GMSL)
(2000-04-30)
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 microstrip line (GMSL) structure. ...
Beam focusing properties of circular monopole array antenna on a finite ground plane
(2005-10-31)
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 than one monopole at a ...