Abstract
A 30% bandwidth phase shifter with four phase states is designed to be integrated in a radio astronomy receiver. The circuit has two 90° out-of-phase microwave phase-shifting branches which are combined by Wilkinson power dividers. Each branch is composed of a 180° phase shifter and a band-pass filter. The 180° phase shifter is made of cascaded hybrid rings with microwave PIN diodes as switching devices. The 90° phase shift is achieved with the two band-pass filters. Experimental characterization has shown significant results, with average phase shift values of -90.7°, -181.7°, and 88.5° within the operation band, 35-47 GHz, and mean insertion loss of 7.4 dB. The performance of its integration in a polarimetric receiver for radio astronomy is analyzed, which validates the use of the presented phase shifter in such type of receiver.
Highlights
The design of phase switching circuits has been a significant task over decades since they define the performance of multiple communication systems
A 30% bandwidth phase shifter with four phase states is designed to be integrated in a radio astronomy receiver
The 180◦ phase shifter is made of cascaded hybrid rings with microwave PIN diodes as switching devices
Summary
The design of phase switching circuits has been a significant task over decades since they define the performance of multiple communication systems. Some phase shifter solutions working at Q-band have been implemented using several technologies, such as monolithic microwave integrated circuit (MMIC) or microelectromechanical systems (MEMS), in which transmission line topologies with active devices are used to achieve the phase shift at a single frequency or over a couple of gigahertz bandwidths with the exception of one broadband design in Ref. 4. All these designs show good phase performances with low phase errors and root-mean-square (RMS) phase errors better than 11.3◦.
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