Design and analysis of microstrip line with novel defected ground structure

Defected ground structure have been always an area of interest for research in millimetre waves and microwaves. In this paper, the different parameters of a defected ground structure which helps in lowering cut-off frequency and resonant frequency of microstripline have been analysed. A circularly shaped defected ground structure which is equivalent to LC model circuit has been simulated and its performance characteristics are studied. As the complexity of a structure increases, due to slow wave effect there is variation in the cut-off frequency and resonant frequency. These variations are useful in size, mutual coupling reduction and harmonic suppression which help in designing of various microwave circuit.