Beam-steering high-gain array antenna with FP Bow-tie slot antenna element for pattern stabilisation

Rafiei V., Sharifi G., Karamzadeh S., Kartal M.

IET MICROWAVES ANTENNAS & PROPAGATION, vol.14, no.11, pp.1185-1189, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 14 Issue: 11
  • Publication Date: 2020
  • Doi Number: 10.1049/iet-map.2019.1071
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Applied Science & Technology Source, Business Source Elite, Business Source Premier, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, Civil Engineering Abstracts
  • Page Numbers: pp.1185-1189
  • Keywords: slot antennas, coplanar waveguides, antenna radiation patterns, beam steering, antenna feeds, microstrip antenna arrays, millimetre wave couplers, bow-tie antennas, beam-steering high-gain array antenna, pattern stabilisation, operating frequencies, elliptical broadband Fabry-Perot cavity structure, modified Butler matrix, phase shift section, frequency band, beam-tilting antenna, FP bow-tie slot antenna element, antenna element, CPW transition, stationary phase, feed network, frequency 20, 0 GHz to 30, 0 GHz, BUTLER MATRIX, PATCH ANTENNA, COMPACT, DESIGN
  • Istanbul Technical University Affiliated: Yes


In this work, a beam-steering array antenna for pattern stabilisation is presented. The antenna element consists of two layers with a unique structure of microstrip to coplanar waveguide (CPW) transition to cover a frequency range from 20 to 30 GHz and a stable pattern at all operating frequencies. To increase the gain of the antenna element, an elliptical broadband Fabry-Perot cavity structure is used. The element manages 3 dB gain bandwidth of almost 23-26 GHz with a 14.4 dBi peak. In addition, a modified Butler matrix consisting of two 90 degrees and two 135 degrees couplers without phase shift section is used to attain a stable pattern. The proposed Butler matrix performs a stationary phase with a phase error of less than +/- 6 degrees over a frequency band from 21 to 29 GHz. The integration of the proposed element and feed network leads to a beam-tilting antenna capable of managing its patterns through the input ports in the operating frequency range of 20-29.5 GHz (9.5 GHz) and 20.6-29.6 GHz (9 GHz) for ports 1 and 2, respectively.