Hyper NRD guide oscillator with Gunn diodes mounted in the dielectric strip

Hyper NRD guide oscillators mounted with a single and multiple Gunn diodes have been investigated. The operating mode of the hyper NRD guide can be lower order by optimizing the structure of the guide. The Gunn diodes were arranged in the dielectric strip of the guide. In experiments at X-band, the oscillation frequencies could be varied by a movable shorting plane for the single diode case and an almost perfect power combining was obtained for the double diode case