Implementation of defected ground structure for microstrip filtenna design

Abstract

A microstrip patch filtenna inspired by defected ground structure (DGS) is presented in this article. It uses modified split ring resonator and capacitance loaded strip as a radiating element. The presented structure is incorporated with a pair of double U-shaped DGS (DU-DGS) to obtain filtering characteristics. The width of DU-DGS plays a vital role in selecting attenuation poles of the filter as well as for the filtenna circuit. The separation distance between the DU-DGS also affects the resonant frequency of the structure. Both radiation and filtration can be performed through a single structure, otherwise known as filtenna. The physical size of the proposed filtenna in terms of guided wavelength is 2.465λ g × 1.160λ g × 0.116λ g at 10.8 GHz, and is comparatively less to others reported, so is considered as a superior feature. The presented filtenna possesses impedance bandwidth of 700 and 1800 MHz at 10.8 and 16.6 GHz, which covers standards of X-and Ku-band, respectively. So, this can be referred to as dual band filtenna. The radiation pattern shows omnidirectionality in both E and H planes at resonance. K E Y W O R D Sdefected ground structure, dual band, filtenna, omnidirectional, split ring resonator

A dual-band filtenna with improved gain using AMC for 5G sub-6 GHz applications

“…Filters designed using SIW technology and resonators can also be integrated with radiating elements to design filtennas. However, they offer narrow impedance bandwidth, which can be mitigated using a double substrate layer in the former case and defected ground structure (DGS) in the latter [7, 8]. A low-profile two-pole filtenna is designed by uniting a ground-imposed coupled line resonator with a monopole antenna [9].…”

Synthesis approach to design a compact printed monopole filtenna for 2.4 GHz Wi‐Fi application

“…The demand for wireless services have seen exemplary growth, whether it is Wireless Local Area Network (WLAN), Worldwide Interoperatability for Microwave Access (WiMax), Global Positioning System (GPS) or portable devices such as mobile phone, Bluetooth, medical equipments, etc. Antenna and filters being inherent passive components in RF front‐end system of wireless communication, there is exponential surge in research targeting to achieve the desired features like light weight, compact, low cost robust front‐end system with good filtering and radiating properties 1‐18 . The performance of front‐end system deeply affects the efficiency and quality of wireless communication system.…”

“…Conventionally, the reported filtennas follows two design approaches, like fusion method 1‐4 and filter synthesis method 5‐13 , 16,18 . Filtennas based on fusion approach, focused on antenna design.…”