S-band phase shifter for phased array antenna by using double balanced mixer

摘要

This paper describes S-band phase shifter by using double balanced mixer (DBM). The phase shifter was developed as a component of a S-band active phased array antenna for the test vehicle which is prepared for the mobile satellite communications experiments using the Engineering Test Satellite VIII (ETS-VIII). Commercial QPSK modulator was used as the DBM phase shifter. Maximum amplitude variance from mean amplitude was 0.7 dB, and maximum phase variance from the input phase value was 1.7°, when the input phase value was rotated from 0° to 360°. The amplitude was linearly operated from 0 dB (at an operating voltage of 7.5 V) to -7 dB (3.5 V). These facts indicated that this phase shifter could precisely control both the phase and the amplitude.