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A compact and low-loss MEMS-based phase shifter is proposed for microwave/millimetre-wave phased array antenna systems. The proposed phase shifter is an alumina-based CPW line, loaded with a variable series capacitor. The phase shifter uses an electromagnetic MEMS actuator to change the capacitor value. A simple three-mask surface micromachining process has been developed for device fabrication. The...
A stair-planar phased array antenna system for vehicular reception of DBS signal in Ku-band was introduced. The height of the antenna is only 6 cm and the system has two-dimensional electronic scanning capability (Fig. 1). A novel beamforming algorithm which is implemented in the system compensates for the fabrication inaccuracies of the microwave components. In this paper we evaluate several beamforming...
We have presented a mobile Ku band satellite TV antenna array which is adaptively controlled by a simple continuous-time analog circuit performing gradient descent. The system achieves tracking speeds in excess of 60deg/s. The analog controller is expected to result in reduced system cost, power consumption and simpler VLSI integration. The algorithm needs no knowledge of the target function and could...
A low-cost Ku-band array of circularly polarized microstrip antennas benefiting from a low-loss waveguide feed network is demonstrated (patent pending). The 128 elements of the array which are arranged in a 4-by-32 configuration are subdivided into four 4-by-8 subarrays. To maintain feed losses and thus the overall noise temperature at a minimum, the subarrays are excited using a 1-by-4 corporate...
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