Low Loss, Wide Band, Phase Shifter Utilizing Transformer

A phase shifter circuit comprising:

• a first port configured to receive a radio frequency (RF) signal that is processed by the phase shifter circuit and output at a load;
• a first switchable conduction path comprising one or more series connected transmission lines, and one or more shunted switching transistors each coupled to a respective transmission line of the one or more series connected transmission lines, the first switchable conduction path configured to selectively couple the first port to a second port via one of a low impedance conduction path and a high impedance conduction path by respectively opening and closing of at least one shunted switching transistor of the one or more shunted switching transistors of the first switchable conduction path;
• a second switchable conduction path comprising one or more series connected transmission lines, and one or more shunted switching transistors each coupled to a respective transmission line of the one or more series connected transmission lines, the second switchable conduction path configured to selectively couple the first port to a third port via one of a low impedance conduction path and a high impedance conduction path by respectively opening and closing of at least one shunted switching transistor of the one or more shunted switching transistors of the second switchable conduction path;
• and
• a first transformer having a first winding and a second winding, the first winding coupled to the second port and the third port at a respective one of two ends of the first winding, and the second winding coupled to the load,
• wherein the phase shifter circuit is configured to operate according to at least two modes of operation, a first mode and a second mode,
• wherein in the first mode of operation, the first switchable conduction path couples the first port to the second port via the low impedance conduction path, and the second switchable conduction path couples the first port to the third port via the high impedance conduction path, and
• wherein in the second mode of operation, the first switchable conduction path couples the first port to the second port via the high impedance conduction path, and the second switchable conduction path couples the first port to the third port via the low impedance conduction path.