Open AccessMicrostrip Feed Trapezoidal Shape Antenna Array with Defected Ground Structure for S Band Applications
Author(s) -
S. Suganthi,
Thiruvalar Selvan Palavesam
Publication year - 2021
Publication title -
international journal of engineering and advanced technology
Language(s) - English
Resource type - Journals
ISSN - 2249-8958
DOI - 10.35940/ijeat.d2497.0610521
Subject(s) - return loss , standing wave ratio , bandwidth (computing) , radiation pattern , insertion loss , materials science , acoustics , ground plane , microstrip , directivity , optics , microstrip antenna , parametric statistics , antenna (radio) , optoelectronics , telecommunications , engineering , physics , mathematics , statistics
In this proposal new trapezoidal patch microstrip feedantenna array with ground defected by square shape is designedfor detailed antenna parameter study in terms of return loss,VSWR, gain and radiation pattern for S band applications from 2to 3 GHz. The bandwidth and radiation properties of fourradiating element arranged in 2 x 2 array has been improved bydefecting half of the ground by etching square shape opposite tothe vertical feed point. 30 x 70 x 1.6 mm dimension structure hasbeen fabricated in FR4 substrate for low cost applications andperformance analyzed in three different planes. With comparisonof four element array with full ground, the proposed array withdefected ground has proved the improvement in behavior withreturn loss of -34.687 dB and ideally fit with VSWR of 1.038.Parametric study with feed length and substrate thickness has alsobeen performed optimized decision of structure dimension. Thisstudy reveals that by reducing the substrate thickness andincreasing the feed length, we can improve the performance ofloss reduction. The front view has been simulated with full groundand defected ground for comparison and the compared resultsshows that the loss reduction of -22 dB has been achieved withVSWR value of 1.03 from 2.28 for defected ground structure. Thedesigned structure has been simulated with CST software and thecomparison of simulated results has conform that the proposedstructure can be used for S band application like airportsurveillance radars with wide bandwidth of 120 MHz and gain of3.52 dBi. Comparison has been made between the proposedantenna array and the antennas available in literature withrespect to bandwidth gain, reflection coefficient and defection typefor better understanding.