Compact Directional Coupler for High-Power Applications

In this paper, a compact and miniaturized coupler is designed for high-power applications with coupling of about - 53dB in the frequency band between 10 ∼ 100 MHz. The coupler is composed of a compact coaxial line and a series of equalizers. Such design exhibits high power handling capacity (up to 2 kW), flat coupling of −53 dB, and high directivity (more than 30 dB). And the coupling value can also be conveniently tuned by the equalizers.