Microstrip Phase Inverter Using Interdigital Strip Lines and Defected Ground
2012
Abstract—A new wide-band microstrip phase inverter is reported in this paper. Interdigital striplines, defected ground and via holes are used to obtain 180◦ phase shift. The structure is simple and can be realized with ordinary microwave integrated circuit (MIC) fabrication process. The bandwidth is enhanced largely. A lumped-element model of the phase shifter is devised. The fabricated phase inverter has a bandwidth of 105.6% (2.065–6.682 GHz), with 1 dB insertion loss and a phase deviation less than 10◦.
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