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A dual frequency microstrip antenna for Ka bandFor fixed satellite communication systems at Ka band with downlink at 17.7 to 20.2 GHz and uplink at 27.5 to 30.0 GHz, the focused optics and the unfocused optics configurations with monolithic phased array feeds have often been used to provide multiple fixed and multiple scanning spot beam coverages. It appears that a dual frequency microstrip antenna capable of transmitting and receiving simultaneously is highly desirable as an array feed element. This paper describes some early efforts on the development and experimental testing of a dual frequency annular microstrip antenna. The antenna has potential application for use in conjunction with a monolithic microwave integrated circuit device as an active radiating element in a phased array of phased array feeds. The antenna is designed to resonate at TM sub 12 and TM sub 13 modes and tuned with a circumferential microstrip ring to vary the frequency ratio. Radiation characteristics at both the high and low frequencies are examined. Experimental results including radiating patterns and swept frequency measurements are presented.
Document ID
19860000913
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Lee, R. Q. (NASA Lewis Research Center Cleveland, OH, United States)
Baddour, M. F. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1985
Subject Category
Communications And Radar
Report/Patent Number
NAS 1.15:87124
NASA-TM-87124
E-2737
Meeting Information
Meeting: 1985 Antenna Appl. Symp
Location: Cleveland, OH
Country: United States
Start Date: September 18, 1985
End Date: September 20, 1985
Sponsors: Illinois Univ. and RADC, Monticello, Ill.
Accession Number
86N10380
Funding Number(s)
PROJECT: RTOP 506-58-22
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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