Novel UWB Trapezoidal and Butterfly Shaped Microstrip Phase Shifters Using Multilayered PCB Technology
Keywords:
Beam-forming, microstrip phase shifters, microstrip printed circuit board (PCB) technology, multi-layer technology, ultra-wideband (UWB)Abstract
In this paper, design of two different aperture-coupled phase shifters for ultra-wideband (UWB) multilayer microwave circuits are introduced. The proposed phase shifters use broadside coupling between microstrip patches at the top and the bottom layers via a rectangular-shaped slot in the common ground plane (mid-layer). The proposed patch shapes are trapezoidal and butterfly shapes which are capable of achieving broadband characteristics for UWB operation. The reference transmission line is installed on the top layer. The numerical calculated results using two simulation programs using two different numerical techniques show that the proposed phase shifters have good phase characteristics with high return losses and good insertion losses over most of the 3.1–10.6 GHz frequency band. The phase characteristics for the proposed phase shifters can be easily controlled by proper adjusting the physical dimensions. Two 45° phase shifters prototypes are fabricated and then tested experimentally using Agilent E8364B PNA Network Analyzer. Experimental results are in good agreement with the calculated ones.
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References
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