Abstract
ABSTRACTIn this letter, a novel differential transmission‐line (TL) loaded with circular substrate integrated waveguide (SIW) cavity is presented for realizing K‐band push‐push oscillator. The SIW cavity is working at TM110 mode to enforce the 180° phase difference between two sub‐oscillators, and the tuning metal vias perturbation is introduced in the SIW resonator to maximize the distance between desired odd TM110 mode and adjacent even modes to stabilize the oscillation mode. Unlike the conventional SIW resonator structure, this differential TL possesses a reflective‐type property at the resonance frequency. A 19.76 GHz push–push oscillator based on this differential TL is designed and implemented. The measured suppression of fundamental frequency component is −25.62 dBc, and the phase noise is −118.1 dBc Hz−1 at 1 MHz offset frequency, which corresponds to a figure‐of‐merit (FOM) of −191 dBc Hz−1. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1217–1221, 2016
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