Generation and filtering of microwave radiation in the antenna-oscillator with substrate integrated waveguide

 

V. E. Lyubchenko, E. O. Yunevich, V. I. Kalinin, V. D. Kotov, D. E. Radchenko, S. A. Telegin

Kotel’nikov Institute of  Radio-engineering and Electronics of Russian Academy of Sciences

 

The paper is received on September 20, 2016

 

Abstract: Microwave oscillator, based on the microstrip log-periodic antenna integrated with field-effect transistor and substrate integrated waveguide (SIW) is experimentally studied. SIW consisted of two dielectric plates with one side being covered by thin metal film. Another side of one of these dielectric plates was used as a substrate for the antenna-coupled field-effect transistor. Thus the microstrip antenna-oscillator was inserted into the SIW. SIW geometry provides microwave propagation and output both at the fundamental frequency of the log-periodic antenna and at the second harmonic. For more generation efficiency one end of the SIW was shorted and another one was narrowed, so the microstrip antenna-oscillator turned to be inside the rectangular microwave resonator. Computer modeling of the oscillator construction at the fundamental frequency and second harmonic was performed via FDTD method. S-parameters were evaluated in the frequency range 10.5-12.5 GHz, that confirmed a good matching and feedback in the oscillator. The simulation showed also, that the microwave energy at the fundamental frequency is concentrated inside the resonator and the second harmonic radiation propagates outside through the narrow part of the SIW if the evanescent waveguide is used. In the experiments Arlon AD255 was used as a dielectric for SIW fabrication and NE350184C field-effect transistor with 13,5 dB gain at 20 GHz was integrated with log-periodic antenna. Experimentally obtained output power was 1mW at the fundamental frequency (12 GHz) and 100 uW at the second harmonic.

Key words: microwave, oscillator, substrate integrated waveguide, log-periodic antenna, field-effect transistor.

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