Five Element Printed Modified Vivaldi Array Covering 5.3 to 20 GHz
Aparna Harshitha Chitturu1, Bhagya Lakshmi Munagoti2, Narasimha Sastry Neti3

1Aparna Harshitha chitturu, ECE, V R Siddhartha Engineering College, Vijayawada, India.
2Bhagyalakshmi Munagoti, Asst.Prof, ECE, V R Siddhartha Engineering College, Vijayawada, India..
3Narasmiha Sastry Neti, Prof, ECE, V R Siddhartha Engineering College, Vijayawada, India..

Manuscript received on 30 June 2019 | Revised Manuscript received on 05 July 2019 | Manuscript published on 30 July 2019 | PP: 1659-1664 | Volume-8 Issue-9, July 2019 | Retrieval Number I7589078919/19©BEIESP | DOI: 10.35940/ijitee.I7589.078919
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Abstract: 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.
Keywords: Multi octave band, phased array, Vivaldi.

Scope of the Article: Multi-Agent Systems