• Journal of the Institute of Electronics Engineers of Korea TC
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• v.44 no.9
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• pp.63-69
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• 2007

The directivity of crossed waveguide directional coupler is generally decreased according as coupling coefficient of it increase. In this paper, the geomertical parameters of crossed slot pair for directivity improvement is modified and the formulas for design of it are proposed. The crossed waveguide directional coupler designed upon the formulas is fabricated with the WR42 waveguide in K-band. The measured results show that the coupling coefficient is 21.5 dB and directivity is minimum 23.9 dB over the operating frequency from 18GHz to 26.5GHz.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.12 no.2
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• pp.176-183
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• 2001

A cavity stabilized Gunn oscillator at 24 GHz has been developed with WR-42 waveguide structure by HFSS simulation. The oscillator has been optimized by using a circular iris and cap resonator structure. This oscillator needs 4.5 V DC voltage / 1.2 A current and produces a maximum +21.27 dBm RF power at 24.0675 GHz.