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A microstrip array feed for land mobile satellite reflector antennas

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2 Author(s)
Huang, J. ; Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA ; Jamnejad, V.

A circularly polarized feed array for a spacecraft reflector antenna is described that was constructed by using linearly polarized microstrip elements. The array has seven subarrays which form a single cluster as part of a large overlapping cluster reflector feed array. Each of the seven subarrays consists of four linearly polarized microstrip elements. The array achieved a better than 0.8-dB axial ratio at the array pattern peak and better then 3 dB antenna gain to 20 degrees from the peak, across a 7.5% frequency bandwidth. A teardrop-shaped feed probe was used to achieve wideband input impedance matching for the relatively thick microstrip substrate. The low impedance and axial ratio bandwidths were achieved using a relatively thick honeycomb substrate with the impedance-matching feed probes.<>

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Antennas and Propagation, IEEE Transactions on  (Volume:37 ,  Issue: 2 )