Electronically Controllable Phase Shifter with Progressive Impedance Transformation at K Band

Abstract

This communication presents the design of a two-port electronically tunable phase shifter at K band. The phase shifter consists of a 3 dB hybrid coupler loaded with reflective phase-controllable circuits. The reflective circuits are formed by varactors and non-sequential impedance transformers which increase the operational bandwidth and the provided phase shift. The final phase shifter design is formed by two loaded-coupler stages of phase shifting to guarantee a complete phase turn. An 18 GHz phase shifter design with dynamic range of 600 degrees of phase shift is depicted in this document. The prototype is manufactured and validated through measurements showing good agreement with the simulation results.

Passive Planar Microwave Devices

“…In [1], ElKhorassani et al presented the design of a two-port electronically tunable phase shifter with progressive impedance transformation in the K band. The phase shifter consists of a 3 dB hybrid coupler loaded with reflective phase-controllable circuits.…”

Low-Loss Reconfigurable Phase Shifter in Gap-Waveguide Technology for mm-Wave Applications

“…Some of them require a complex setup [5] or a more complicated implementation of the tunning elements in the waveguide [15]. By applying the gap-waveguide technology in the phase shifter design, more options in the location of the gap for the split waveguide is achieved in contrast with the traditional implementation using E-plane split waveguide [13,10]. In addition, the required volume of the device is reduced compared to the commercial devices [27].…”

“…Similarly, [5] shows a reconfigurable phase shifter based on a piezoelectric actuator, where the side wall of the waveguide is in this case a perfect magnetic conductor (PMC). Other approaches to obtain phase shift employ PIN diodes [6,7,8,9,10,11,12]. Nevertheless, PIN diodes suffer from high losses in mm-wave regime.…”