Band-stop Filtering for Electromagnetic Interference Rejection in Printed UWB Components Using Single Compact Archimedean Spiral EBG Cell

Abstract

The design and analysis of a compact printed Archimedean spiral electromagnetic bandgap (EBG) structure are presented for frequency shielding in microwave circuits, including antenna and bandpass filters. The EBG characterization resonating at 7.7 GHz is done through a performance matrix such as transmission and reflection coefficients and equivalent circuit modeling, which demonstrates excellent resonance stability. The EBG unit cell is investigated for achieving frequency rejection in the printed monopole-based ultra-wideband (UWB) antenna and bandpass filter circuits. By introducing the Archimedean EBG unit cell on the UWB antenna ground plane, dual-frequency rejection, at 7.4, and 7.7 GHz, was realized. Further, such a structure is utilized in a multi-mode resonator (MMR) based UWB bandpass filter to attain band-notched functionality at 7.6 and 7.8 GHz with maximum attenuation of −16.5 and −15.6 dB, respectively. The prototypes of the EBG-loaded UWB antenna and EBG-Loaded UWB filter are fabricated and characterized. Excellent agreement is achieved between simulated and measured results of both prototypes.

Design of a Miniaturized Split-ring Resonator Based UWB Notched Bandpass Filter

“…For example, electromagnetic bandgap (EBG) unit cell of Archimedean spiral shape is implemented in both UWB monopole antenna and multi mode resonator (MMR)-based ring stub attached UWB bandpass filter for interfering frequency suppression [4]. Archimedean spiral electromagnetic bandgap (ASEBG) structure is also applied to an existing double-notch UWB bandpass filter comprising a defected L-shaped microstrip structure along with a T-shaped resonator to realize triple-notch bandgap characteristics [5].…”