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A novel E‐plane probe microstrip‐to‐waveguide transition for millimetre‐wave application is proposed. By introducing a fin‐line back‐short structure, tight‐tolerance machining and assembling of the waveguide back‐short commonly encountered with traditional E‐plane probe microstrip‐to‐waveguide transition are no longer necessary. A Ka‐band transition prototype is designed and fabricated to validate the design concept. Simulated and measured results agree well and both of them show the proposed transition achieved good return and insertion losses over the full Ka band. [ABSTRACT FROM AUTHOR]

A high Q‐factor substrate integrated waveguide (SIW) cavity resonator and its application of X‐band low phase noise oscillator is proposed. Complementary split‐ring resonators are used to improve the Q‐factor of the proposed resonator. The size of the resonator is reduced by using quarter‐mode circular SIW cavity. The oscillator based on the proposed SIW cavity resonator can be easily designed and tested. Measured results demonstrate an output frequency of 10.11 GHz and a phase noise of −108.7 dBc/Hz at 100 kHz offset. The oscillator is also able to deliver an output power of 4.6 dBm and harmonic rejection of better than 30 dBc. The proposed oscillator is suitable for low‐cost high‐frequency systems. [ABSTRACT FROM AUTHOR]

A broadband transition from microstrip line to spoof surface plasmon (SP) waveguide is proposed. The transition transforms the guided wave into a spoof SP polariton in a broad microwave frequency band. A back‐to‐back transition sample is fabricated using the proposed method. Good agreement between the measurement and simulation is obtained. The measured results show an insertion loss <2 dB and a return loss below −11 dB from 2.2 to 10 GHz. The proposed broadband transition may pave a way for advanced conventional plasmonic integrated microwave devices and circuits. [ABSTRACT FROM AUTHOR]