Development of GaAs Gunn diodes and their applications to frequency modulated continuous wave radar

Seok Gyu Choi, Min Han, Yong Hyun Baek, Dong Sik Ko, Tae Jong Baek, Sang Jin Lee, Jin Ho Kim, Seong Dae Lee, Mi Ra Kim, Yeon Sik Chae, Adaikalam Kathalingam, Jin Koo Rhee

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4 Scopus citations

Abstract

In this work, we have designed and fabricated the GaAs Gunn diodes for a 94 GHz waveguide voltage controlled oscillator (VCO) which is one of the important parts in a frequency modulated continuous wave (FMCW) radar application. For fabrication of the high power GaAs Gunn diodes, we adopted a graded gap injector which enhances the output power and conversion efficiency by effectively removing the dead-zone. We have measured RF characteristics of the fabricated GaAs Gunn diodes. The operating current, oscillation frequency, and output power of the fabricated GaAs Gunn diodes are presented as a function of the anode diameters. The operating current increases with anode diameters, whereas the oscillation frequency decreases. The higher oscillation frequency was obtained from 60 mm anode diameters of the fabricated Gunn GaAs diodes and higher power was obtained from 68 mm. Also, for application of the 94 GHz FMCW radar system, we have fabricated the 94 GHz waveguide VCO. From the fabricated GaAs Gunn diodes of anode diameter of 60 mm, we have obtained the improved VCO performance.

Original languageEnglish
Article number111202
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume49
Issue number11
DOIs
StatePublished - Nov 2010

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