Abstract
A 3 dB quadrature hybrid in the form of a 4-port microstrip circular disc, is investigated experimentally and theoretically. The hybrid consists of additional reactive stubs and impedance steps to achieve greater operational bandwidth. A relative bandwidth of over 20% is easily obtained for this device.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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