Wideband integrated varactor-tunable active notch antennas and power combiners

A Gunn device in a varactor-tuned slotline coplanar waveguide (CPW) resonator has been integrated with a planar, endfire notch antenna. The varactor provides more than 14% tuning bandwidth centered at 9.6 GHz, with a power output of 14.5+or--0.8 dBm. Wideband tunable quasi-optical power combiners have also been developed using the active elements. The signal spectrum remains clean and very stable with nearly constant power output throughput the electronic tuning range. These results offer a simple, lightweight, low-cost, reproducible, and truly planar active wideband tunable source for many microwave applications.<<ETX>>

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