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The design and test results of an improved C-band four-bit PIN-diode phase shifter are described. Exceptional wideband performance is achieved through the use of a novel planar, s t r i e l i n _~y b~~. c u p ! e r t h a t is used in the 90-degree and 180-degee phase b~t s . The measured amplitude and phase flatness versus frequency of these phase bits exceeds the theoretical bandwidth characteristics of a conventional hybrid ring by itself. For BITE implementation, the PIN diodes are mounted to allow bias voltage and current of each diode to be monitored individually.