Open AccessFive Element Printed Modified Vivaldi Array Covering 5.3 to 20 GHz
Author(s) -
Aparna Harshitha chitturu,
M. Bhagyalakshmi,
Narasmiha Sastry Neti
Publication year - 2019
Publication title -
international journal of innovative technology and exploring engineering
Language(s) - English
Resource type - Journals
ISSN - 2278-3075
DOI - 10.35940/ijitee.i7589.078919
Subject(s) - vivaldi antenna , phased array , antenna array , bandwidth (computing) , reflective array antenna , collinear antenna array , optics , standing wave ratio , grating , directivity , antenna (radio) , acoustics , materials science , dipole antenna , computer science , radiation pattern , microstrip antenna , physics , telecommunications , slot antenna
Isolated singular Vivaldi antennas have been in vogue for multi octave band communications and EW applications. For shared aperture EW applications phased array antennas are being used extensively. For such applications the spacing between array elements is required to be less than 0.576λ for scanning to ±45° to reduce grating and side lobes, where the wavelength (λ) at the highest frequency. Single antennas covering 6 to 18GHz when inserted in an array perform differently due to mutual coupling effects. In this paper, the single isolated antenna is taken as a reference antenna and inserted in the array and parametric studies have been carried out to arrive at an optimum solution for maximizing VSWR and pattern bandwidth in a five element array environment. A S11 of less than -7.5 dB over 5.3-18 GHz has been obtained in array environment. Satisfactory scanning of ±40°over 5.3 to 17.5 GHz is obtained for an 8 element linear array and results are presented.