A Ka-band YIG-based local oscillator for astronomical heterodyne receiver.

A Ka-band local oscillator generator based on YIG-tuned oscillator is designed, fabricated and measured for astronomical telescope applications. The optimized bandwidth analysis can overcome high phase noise problems caused by poor microwave photonic source noise and to improve the outband phase noise of LO by at least 10.5 dB. The experimental results show that the 33.8 GHz LO phase noise of −107 dBc/Hz is achieved at offset frequency of 700 kHz and exhibits a reference spurs of −71 dBc. [ABSTRACT FROM PUBLISHER]