Sidelobe level reduction using Teflon for a microwave and millimetre‐wave antipodal Vivaldi antenna. Issue 6 (19th February 2020)

• Record Type: Journal Article
• Authors: Moosazadeh, Mahdi
• Is Part Of: IET microwaves, antennas & propagation. Volume 14:Issue 6(2020)
• Page Start: 474
• Page End: 478
• Publication Date: 2020-02-19
• Subjects: antenna radiation patterns -- broadband antennas -- electromagnetic wave polarisation -- Vivaldi antennas -- microwave imaging -- millimetre wave imaging -- electromagnetic wave reflection -- microwave antenna arrays -- millimetre wave antenna arrays; millimetre‐wave antipodal Vivaldi antenna -- tapered‐shape Teflon -- wideband low SLL -- cross‐polarisation level -- sidelobe level reduction -- microwave antipodal Vivaldi antenna -- microwave AVA -- end‐fire direction -- reflection coefficient -- imaging applications -- frequency 3.2 GHz to 40.0 GHz; Microwaves -- Periodicals; Microwave antennas -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Microwave communication systems -- Periodicals; 621.381305
• DOI: 10.1049/iet-map.2019.0836
• Languages: English
• ISSNs: 1751-8725

Abstract

Abstract : A new technique for lowering the sidelobe level (SLL) of the microwave and millimetre‐wave antipodal Vivaldi antenna (AVA) has been presented in this study. The technique is based on introducing tapered‐shape Teflon surrounding AVA to couple energy propagated from the antenna and produce stronger radiation in the end‐fire direction and as a result, it offers wideband low SLL. Some features of the presented antenna with the utilised new technique are summarised as follows: high gain in wide bandwidth corrected tilt of beam on E ‐plane in wide bandwidth and low cross‐polarisation level. The presented antenna is fabricated and the magnitude of the reflection coefficient of the fabricated antenna is tested, which is from 3.2–40 GHz with S 11 < −10 dB. It exhibits an average of SLL < −10 dB in E ‐plane and SLL < −18 dB in H ‐plane at a wideband of 3.2–40 GHz. Moreover, the lowest E ‐plane's SLL of −20 dB is achieved over the frequency band of 7–7.5 GHz. The proposed antenna has a small size of 43 (width) × 108 (length) mm 2 . The proposed antenna with the mentioned features becomes an attractive candidate for imaging applications.