NDLI: A 10-183 GHz common aperture antenna with a quasioptical frequency multiplexer

Content Provider	IEEE Xplore Digital Library
Author	Moore, E.L.
Copyright Year	1995
Description	Author affiliation: Millitech Corp., South Deerfield, MA, USA (Moore, E.L.)
Abstract	A multifrequency coboresighted antenna would be cost effective because many wavelengths utilizing different receiver technologies would be observed with one instrument. Because the size of quasioptical components is determined by wavelength, filtering the lowest frequencies from the beam first allows the system to be compact. Two calibration schemes are then possible, a conventional method for the microwave frequencies and a quasioptical method for the shorter wavelengths. The brassboard instrument described in this paper consists of an offset Cassegrain antenna with a 60/spl times/65 cm aperture and a quasioptical frequency multiplexer with 7 distinct channels at 10, 18, 22, 37, 50-58, 90, and 183 GHz. The frequency selective surfaces (FSS) include 1 dual frequency bandpass filter and 4 perforated ellipsoidal mirrors, which are high pass filters in the band of interest and focusing elements below the cutoff frequency. With the main reflector and subreflector this system is contained in a volume 175/spl times/155/spl times/68.3 cm. The multiplexer by itself has dimensions of 100/spl times/155/spl times/32 cm, which include all feeds, lenses, and fss components. In each band the power is coupled to waveguide via a scalar feed and a lens. In all channels the authors measured beam patterns, gain, cross polarization, return loss, and interchannel isolation.<>
Starting Page	220
Ending Page	222
File Size	236315
Page Count	3
File Format	PDF
ISBN	0780324021
DOI	10.1109/COMEAS.1995.472316
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-04-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Aperture antennas Frequency selective surfaces Instruments Multiplexing Cutoff frequency Band pass filters Feeds Lenses Multifrequency antennas Receiving antennas
Content Type	Text
Resource Type	Article

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