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ABSTRACT: The design of electrically steerable traveling wave microstrip antenna arrays is presented. Varactor diode based phase shifters implemented on the same metallic layer as the patch elements are used to provide a variable progressive phase shift in the array. Two antennas for the 5.8 GHz ISM band, manufactured as single layer printed designs on a standard PTFE soft substrate, are demonstrated. A ten-element beam-tilting vertical array using transmission type phase shifters is realized, yielding between 11.8 to 13.9 dBi gain for the 0deg to 11deg beam tilt tuning range. Using wide phase tuning range reflection type phase shifters a five-element horizontally scanning array with -32deg to 32deg steering range and 10.9-11.3 dBi gain has been realized.
IEEE Transactions on Antennas and Propagation 10/2007; · 2.15 Impact Factor
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ABSTRACT: A traveling-wave microstrip array antenna with circular polarization in presented. It uses a novel circularly polarized dual-feed radiating element. The element is a square microstrip patch with a chamfered corner. It is fed by microstrip lines, so radiating element and feed lines can be realized in a single layer. A five-element array is designed and built. Measured performance is presented.
IEEE Antennas and Wireless Propagation Letters 02/2007; · 1.37 Impact Factor
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ABSTRACT: New mobile broadband high bit rate services will require significantly better spectral efficiency than traditional mobile voice and low bit rate services to reach a mass market. Radio base station antennas with fast beam steering in elevation and/or azimuth can significantly improve the carrier to interference ratio and hence the spectral efficiency. The carrier to interference ratio improvement of using fast beam steering in elevation is estimated using a two cell model. Electrically steerable base station antennas suitable for fast beam steering have been designed and built. The antennas are travelling wave microstrip patch arrays with varactor diode based phase shifters between the elements. The phase shifters are chosen to have very fast response time to allow beam steering on a per time slot basis
Wireless Technology, 2006. The 9th European Conference on; 10/2006
