SUBSTRATE INTEGRATED WAVEGUIDE SIGNAL LEVEL CONTROL ELEMENT AND SIGNAL PROCESSING CIRCUITRY
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United States of America Patent
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Issued Date -
Jun 16, 2022
app pub date -
Feb 28, 2020
filing date -
Feb 28, 2020
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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.
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