Topic
Cassegrain antenna
About: Cassegrain antenna is a research topic. Over the lifetime, 3207 publications have been published within this topic receiving 28278 citations.
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Abstract: A low profile coplanar waveguide (CPW) fed printed slot antenna is presented with uni-directional radiation properties. The slot antenna radiates above a closely spaced artificial magnetic conducting (AMC) reflector consisting of an array of rectangular patches, a substrate and an electric ground plane. The electromagnetic bandgap (EBG) performance of the cavity structure between the upper conducting surface in which the slot is etched, and the ground plane at the bottom of the reflector, is investigated using an equivalent waveguide feed in the place of a half-wavelength section of the slot antenna. From the reflection coefficient of the equivalent waveguide feed one can determine the frequency band where minimum energy will be lost due to unwanted radiation from the cavity sides. The dimensions of the cavity were found to be very important for minimum energy loss. Experimental results for the final antenna design (with a size of 1.02λ0×0.82λ0×0.063λ0), mounted on a 1.5λ0×1.5λ0 back plate, exhibit a 5% impedance bandwidth, maximum gain in excess of 10 dBi, low cross-polarization, and a front-to-back ratio of approximately 25 dB. This low-profile antenna with relatively high gain could be a good candidate for a 2.4 GHz WLAN application.
100 citations
TL;DR: In this paper, a Van Atta antenna array, which has a major lobe of the reradiated field in a direction retrograde to that of the incident wave for arbitrary directions of incidence, is analyzed in terms of the scattering matrix of the network interconnecting the antennas.
Abstract: A Van Atta antenna array, which has a major lobe of the reradiated field in a direction retrograde to that of the incident wave for arbitrary directions of incidence, is analyzed in terms of the scattering matrix of the network interconnecting the antennas.
95 citations
TL;DR: In this paper, the equivalent paraboloid for offset Cassegrain and Gregorian antennas is derived for systems with circular exit apertures and diffraction effects are investigated using tapered and scanned feeds.
Abstract: The equivalent paraboloid is derived for classical offset Cassegrain and Gregorian antennas. The important practical case of systems with circular exit apertures is discussed in detail, and a condition for a symmetric equivalent paraboloid is derived. For such systems, diffraction effects are investigated using tapered and scanned feeds to illuminate the equivalent paraboloid and the two-reflector system. >
86 citations
01 Nov 1947
TL;DR: In this paper, the fundamental relations and design criteria for parabolic radiators at microwave frequencies (i.e., wavelengths between 1 and 10 centimeters) are given, and the properties of the parabola which make it useful as a directional antenna are discussed.
Abstract: This paper is intended to give fundamental relations and design criteria for parabolic radiators at microwave frequencies (i.e., wavelengths between 1 and 10 centimeters). The frst part of the paper discusses the properties of the parabola which make it useful as a directional antenna, and the relation of phase polarization and amplitude of primary illumination to the over-all radiation characteristics. In the second part, the characteristics of practical feed systems for parabolic antennas are discussed.
84 citations
TL;DR: The FT of a square, uniformly illuminated aperture can be obtained from the following Mathematica routine (to replace Mat.3.6), showing the well-known "cross-shaped" sidelobes of the "Sinc" function.
Abstract: p. 51 Fig. 3.9 this is not the correct three-dimensional picture of the Fourier Transformation of a square aperture distribution. Rather, as the Mathematica routine on page 54 indicates, it is the "azimuthal revolution" of the one-dimensional block-function. The FT of a square, uniformly illuminated aperture can be obtained from the following Mathematica routine (to replace Mat.3.6), showing the well-known "cross-shaped" sidelobes of the "Sinc" function.
83 citations