An Improvement of Defected Ground Structure Lowpass/Bandpass Filters Using H-Slot Resonators and Coupling Matrix Method

Ano: 2011 | Volume: 10 | Número: 2

Autores: Ahmed Boutejdar, Abbas Omar, Edmund P. Burte, Reinhard Mikuta

Palavras-chave: H-defected ground structure (H-DGS), microstrip lowpass filter (LPF), microstrip bandpass filter (BPF).

Resumo Inglês:

A novel compact wideband high-rejection lowpass filter
(LPF) using H-DGS is presented. The proposed filter has neither
open stub nor cascaded high-low impedance elements. It consists of
two coupled H-slots in the ground plane along with a compensated
line. The effect of the new slot on the filter performance is examined.
The comparison with the conventional filters shows that the
proposed one guarantees a large rejected-band of 20dB from 2.5 to
16 GHz. Experimental measurements by means of HP8719D
network analyzer agree well with simulated results which are
carried out by Microwave Office. Based on H-DGS LPF Structure, a
novel bandpass filter (BPF) will be is designed and tested verified by
using both J-inverter and coupling matrix methods.