Performance Enhancement of Microstrip Hairpin Band Pass Filter Using Dumbbell DGS and Split Ring Resonator DGS
Keywords:
Bandpass, Chebyshev, DGS, Hairpin Resonator, Openstub, StopbandAbstract
In this paper, five pole chebyshev microstrip band
pass filter is designed using hairpin resonators. A dumbbell shaped defected ground structure and square split ring resonator DGS are presented to suppress the second and third order harmonics of bandpass filter. Dumbell and square split ring resonator defected ground structure cells are etched under feed lines for improving stop band rejection without affecting the centre frequency and insertion loss of basic filter. For
effective suppression of higher order harmonics open stubs are also used at the input and output feed lines. A five pole chebyshev microstrip band pass filter is designed with 700 MHz bandwidth at the centre frequency of 2.5 GHz. Band pass filter is simulated using ADS 2009 software. The simulated results of conventional band pass filter, dumbbell DGS bandpass filter and SRR DGS bandpass filter are compared and tabulated.Compared to dumbbell DGS bandpass filter, SRR DGS bandpass filter has improved suppression at second harmonic frequency
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