Microstrip filter with defected ground structure: a close perspective

Abstract

This paper presents a close but a beginner's perspective and a comprehensive review of microstrip filters with defected ground structure (DGS). The concept of DGS is inspired by photonic/electromagnetic bandgap structures (EBG/PBG) and metamaterials that are employed in microwave components to achieve a variety of performance enhancement features. Modeling of DGS and metamaterials as an L-C equivalent lumped circuit is much simpler in comparison with complex EBGs/PBGs. In this review, we have given a detailed account of the microstrip filters using DGS.

Compact Wideband Broadside-Coupled Microstrip-Slot Bandpass Filter for Communication Applications

“…Besides, numbers of researchers have also proposed a design of bandpass filter by using defected ground structure (DGS) technique [2][3]. In [2], the design has four coupled Ushaped DGS on the common ground plane.…”

“…Subsequently, the vital front-end component features in the wireless communication system, includes bandpass filter (BPF). In recent years, it can be seen that various rapid developments in the variety of BPF designs have been reported in the literature [1][2][3][4][5][6][7].In [1], the authors present a theory and direct synthesis of a wideband progressively coupled BPF. The designed filter is claimed adequate to accomplish similar manageable number transmission zeros as that of resonators over the passband.…”

“…The designed filter is claimed adequate to accomplish similar manageable number transmission zeros as that of resonators over the passband. The resonators contain a parallel pair attached capacitive loaded, and grounded inductive stubs are linked over a short section of a transmission line with a certain assigned electrical length, which allow the filter to have a wide range of stopband.Besides, numbers of researchers have also proposed a design of bandpass filter by using defected ground structure (DGS) technique [2][3]. In [2], the design has four coupled Ushaped DGS on the common ground plane.…”

“…As a result, the BPF displays two transmission zeros on either side of the passband, thereby improving the selectivity of the filter on both sides of the passband. Similar to the filter reviewed in [3], the DGS has been implemented into the filter designed whereas the motivation of the DGS technique is impending from the bandgap structures of electromagnetic/photonic (EBG/PBG). In the paper, the authors introduce the function of metamaterials.…”

Investigation on Microstrip Filters with CSRR Defected Ground Structure

“…The slow-wave effect arises due to the defect in the ground plane of microstrip line. This slow-wave effect assists in size reduction of components [1][2][3]. In recent year, the lefthanded Metamaterial drew the attention of scientist, engineers and researchers in designing microwave components for high performance [4].…”