A shield enclosed microstrip circuit microwave multi-diode switch with undesired waveguide signal transmission minimized. Diodes are spaced and connective microstrip sections dimensioned for optimum signal isolation in the OFF state. Further, diode dc bias isolation is provided for multi-diode sections of such switches by signal path coupling capacitors, along with dc bias supply RF rejection filtering minimizing loss of signal power and that minimizes disturbance of signal line impedance over a relatively broad band range of operation.
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