Substrate integrated waveguide signal level control element and signal processing circuitry

Abstract

A signal level control element comprises a substrate having conductive formations defining a substrate integrated wave-guide arrangement disposed at least partly within the substrate; the substrate integrated waveguide arrangement providing a quadrature hybrid coupler having first and second pairs of signal ports, such that a signal introduced to a port of one pair of the first and second pairs is provided with equal amplitude but a 90 degree phase difference to both ports of the other pair of the first and second pairs; in which a port of the first pair is configured to receive an input signal and the other port of the first pair is configured to provide an output signal; and termination circuitry connected to the ports of the second pair, the termination circuitry providing, for each port of the second pair, a respective termination having a variable impedance dependent upon a respective control signal.

Dependencies are inferred from the claim text.