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This paper aims to formulate a mathematical model for efficiently estimating the performance of parabolic reflector antennas. The paper provides more general and complete formulations with arbitrary power for the feed cosine taper. The cross-polarized components are modeled by sine tapers which results in more practical performance estimations. Particular aperture efficiency and spillover efficiency...
Broadband antennas such as horn and spirals are suitable for testing range references, direction-of-arrival estimation and other UWB applications. However, one problem with most broadband antennas is the frequency dependency of the antenna beamwidth as well as antenna gain. In this work, a beamwidth compensation measure is proposed by adding an RF lens in front of the broadband antenna. By adjusting...
In this work, an LNA module is moved into a corner-truncated patch antenna, which is intended for GPS reception use. A cavity is formed within the substrate of the patch to accommodate the LNA module. The built-in LNA enhances the antenna reception capability without adding external circuits. Hence, the resulting patch has the same footprint and thickness as ordinary passive patches. Simulations and...
Irregularly contoured two-dimensional arrays consisting of finite number of probe-fed microstrip patches are investigated using a generalized forward backward method (GFBM) with discrete Fourier transform (DFT)-based acceleration algorithm. In this method, unknown current coefficients corresponding to a single patch are first solved by a conventional method-of-moments (MoM) procedure. The solution...
Multi-arm spiral antennas are widely employed in the applications of radar direction-finding system. In practical applications, they can be integrated with external structures such as radomes and RF lens. The external structures alter the antennas' natures of frequency-independency and may impact their performance in predicting the direction of an incident plane wave. This paper evaluates their performance...
An efficient procedure, based on a discrete Fourier transform (DFT) expansion of planar array distributions, is described for synthesizing contoured beams in satellite antenna applications. The DFT provides a global basis set that spans over the entire array, and thus produces highly directional beam patterns to serve as corresponding local basis functions for representing the desired far zone radiation...
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