W Band Efficient Frequency Doubling Technology

Millimeter-wave source is a very crucial part of advanced communication and radar system. Stability and phase noise of simple solid state millimeter-wave source are difficult to meet the engineering requirements. Frequency-multiply technology reduces the main vibration frequency and provides high quality millimeter-wave source. Three millimeter wave (94GHz) is not only the window frequency, but also the basic study of THz, so three millimeter wave frequency multiplier is widely used.W band doubler and tripler are studied in this dissertation. The doubler is formed by a GaAs flip chip schottky barrier diode with self-bias. The input signal and output signal are fed by finline. In order to design the doubler more effectively, operating at the U band and W band antipodal finline-to-microstrip transition, microstrip low pass filter, input and output matching circuit and the performance of entire doubler are optimized by circuit simulation software ADS and 3D field simulation software HFSS. Varactor diodes constituting anti-parallel pairs structure is used to achieve the tripler. ADS and HFSS are also used to co-simulate the circuit. Operating at the Ka band and W band microstrip probe, microstrip low pass filter and the performance of entire tripler are optimized.Finally, the W band frequency doubler and tripler are developed to test their performances. The output power of doubler from 84GHz to 96GHz is about between 1mW and 3.4mW. The output power of tripler from 94.2GHz to 95.6GHz is about between 1mW and 4.7mW. This study has a positive role on the promotion of W band frequency multiplier.