Microstrip Antenna with Centrally Loaded Inductive Discontinuity for Dual Band Operation

A conventional microstrip antenna on grounded PTFE substrate with centrally loaded indu c tive discontinuity is proposed for dual band operation. The discontinuity has been produced by two thin metallic plates centrally beneath the rectangular patch to form an inductive window. The proposed antenna has been studied methodically and the results are verified with commercially available software package (High Frequency Structure Simulator, V. 10). The specialty of the proposed antenna is to excite a new resonant mode with good impedance bandwidth while the usual dominant TM 10 mode is kept unaltered. Moreover, the salient feature of the new antenna is that it produces the radiation pattern exactly similar to dominant TM 10 mode at its new resonant mode.