Ka band phased patch array antenna integrated with a PET controlled phase shifter
In this article, a 4 x 4 linear phased patch array antenna, consisting of four 1 x 4 patch subarrays and a true time delay multiline phase shifter, is proposed on a thin film liquid crystal polymer substrate at Ka band. The patch antenna is designed with a gain of 6 dBi at 35 GHz and a bandwidth of 23% centered at 35 GHz. To enhance the gain and symmetrize the beam patterns of the 4 x 4 array, a 1 x 4 patch subarray in the E plane was designed and characterized. The subarray produces an enhanced gain of 11 dBi and a wide beamwidth of 38deg in the H plane for beam steering. The proposed phase shifter comprises a 1 x 4 microstrip line power splitter and a piezoelectric transducer controlled phase perturber. A large phase variation of up to 370deg and a low insertion loss of less than 2 dB were demonstrated for the phase shifter at Ka band. The integrated phased array attains a gain of 15.6 dBi, and a continuous true time delay beam steering of up to 33 1deg from 31 to 39 GHz. (c) 2015 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2015.