scholarly journals A Compact Wideband Dual-Polarized Antenna with Harmonic Suppression Using Nonuniform Defected Ground Structure

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Lana Damaj ◽  
Anne-Claire Lepage ◽  
Xavier Begaud
Keyword(s):  
Coplanar Waveguide ◽  
Stop Band ◽  
Harmonic Suppression ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Complete Structure ◽  
Harmonic Rejection ◽  
Compact Size ◽  
Dual Polarized ◽  
Band Characteristic

A wideband dual-polarized coplanar waveguide (CPW) fed antenna integrating a wide stop-band filter is presented. The designed filter is based on a nonuniform defected ground structure (DGS) in order to obtain a wide stop-band and a compact size. This filter is used to reject harmonics and spurious radiation arising from the RF front end. The complete structure (antenna and filter) has been optimized to have a compact size of0.6×0.6λ02(λ0being the free-space wavelength at the lowest operating frequency). The realized antenna operates in the frequency range between 2.7 GHz and 5.9 GHz (bandwidth of about 74%). The isolation between feeding ports is more than 18 dB. The complete structure has a wide stop-band characteristic (103%) for harmonic rejection. The simulated numerical results have been confirmed with measurements.

Novel Low-Pass Microwave Filter Based on Rectangular Ring DGS

2013 ◽  
Vol 273 ◽  
pp. 371-374
Author(s):  
Bao Ping Li ◽  
Yan Liang Zhang
Keyword(s):  
Stop Band ◽  
Center Frequency ◽  
Pass Band ◽  
Band Pass Filter ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Compact Size ◽  
Low Pass

Due to the frequency response periodicity of distributed transmission line, microstrip band-pass filter usually produces parasitic pass-band and outputs harmonics away from the center frequency of main pass-band. Based on the study of rectangular ring defected ground structure, a 5-order microstrip LPF(low-pass filter) was designed using the single-pole band-stop and slow-wave characteristics of the rectangular ring DGS(Defected Ground Structure) and SISS(Step-Impedance Shunt Stub) structure. Compared with traditional LPF, this LPF presents the advantages of compact size, low insertion loss, broad stop-band and high steep. It also validates the requirements of miniaturization and high performance for filters.

scholarly journals A Bandpass Filter Based on Half Mode Substrate Integrated Waveguide-to-Defected Ground Structure Cells

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Yong Mao Huang ◽  
Zhenhai Shao ◽  
Zhaosheng He ◽  
Chang Jiang You ◽  
Di Jiang
Keyword(s):  
Insertion Loss ◽  
Bandpass Filter ◽  
Second Harmonic ◽  
Substrate Integrated Waveguide ◽  
Harmonic Suppression ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
X Band ◽  
Compact Size ◽  
Low Insertion Loss

A half mode substrate integrated waveguide-to-defected ground structure (HMSIW-DGS) cell and its embedded form are proposed to miniaturize a bandpass filter. Both cells can purchase wideband frequency response and low insertion loss, as well as simple and easy fabrication. By cascading two of them according to design requirement, an X-band bandpass filter is designed and measured to meet compact size, low insertion loss, good return loss, second harmonic suppression, and linear phase.

Design of a Dual Stop-Band Filter Based on Coplanar Waveguide

2012 ◽  
Vol 151 ◽  
pp. 145-149
Author(s):  
Zhong Liang Deng ◽  
Chang Shu ◽  
Nai Bo Zhang
Keyword(s):  
Equivalent Circuit ◽  
Coplanar Waveguide ◽  
Stop Band ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Band Filter ◽  
Spiral Shape

This letter presents a dual stop-band filer based on coplanar waveguide (CPW), which consists of two spiral-shaped defected ground structure (DGS). The model of the equivalent circuit, discussing the influence of the spiral shape size, and simulated performances are presented. Finally, a dual stop-band filter is presented and verified by simulations, which is operated from 11.5 to 14 GHz and 23 to 28 GHz.

scholarly journals Application of Defected Ground Structure to Suppress Out-of-Band Harmonics for WLAN Microstrip Antenna

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Pravin Ratilal Prajapati
Keyword(s):  
Microstrip Antenna ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Filter Design ◽  
Stop Band ◽  
Local Area ◽  
Area Network ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Cst Microwave Studio

An application of defected ground structure (DGS) to reduce out-of-band harmonics has been presented. A compact, proximity feed fractal slotted microstrip antenna for wireless local area network (WLAN) applications has been designed. The proposed 3rd iteration reduces antenna size by 43% as compared to rectangular conventional antenna and by introducing H shape DGS, the size of an antenna is further reduced by 3%. The DGS introduces stop band characteristics and suppresses higher harmonics, which are out of the band generated by 1st, 2nd, and 3rd iterations. H shape DGS is etched below the 50 Ω feed line and transmission coefficient parameters (S21) are obtained by CST Microwave Studio software. The values of equivalent L and C model have been extracted using a trial version of the diplexer filter design software. The stop band characteristic of the equivalent LC model also has been simulated by the Advance Digital System software, which gives almost the same response as compared to the simulation of CST Microwave Studio V. 12. The proposed antenna operates from 2.4 GHz to 2.49 GHz, which covers WLAN band and has a gain of 4.46 dB at 2.45 GHz resonance frequency.

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