X Band Feedback Type Miniaturized Oscillator Design With Low Phase Noise Based on Eighth Mode SIW Bandpass Filter
A standard substrate integrated waveguide (SIW) based bandpass filter (BPF) suffers from bulkiness that limits its application in the implementation of compact size low phase noise oscillator. Instead, in this letter, an eighth mode SIW (EMSIW) resonator based BPF is utilized to realize a miniaturized low phase noise oscillator for <inline formula> <tex math notation="LaTeX"$X$ /tex math>/inline formula> band applications. Additionally, an equivalent circuit model of EMSIW BPF is presented. A compact feedback type oscillator prototype using EMSIW BPF is designed and fabricated for the first time with a circuit area of just 1092 mm<sup>2</sup> The experimental results of the prototype show a phase noise of 126.13 dBc/Hz at 1 MHz offset from 9.97 GHz oscillation frequency with an output power of 3.17 dBm.
IEEE Microwave and Wireless Components Letters