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Analytical study of open-stopband suppression in leaky-wave antennas

Rezaee, S ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1109/LAWP.2019.2963798
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2020
  4. Abstract:
  5. In the majority of leaky-wave antennas (LWAs), the lack of broadside radiation is due to the existence of an open-stopband (OSB) at broadside. In this letter, we present a study on the OSB suppression in LWAs. In particular, we start from a simple unit cell comprising a planar waveguide having alternating open and short sidewalls. The analytical and simulated band structures testify consistently that OSB suppression can indeed be realized by proper design, analytically studied using mode-matching, and further supported by full-wave simulations. An LWA is then implemented using the substrate integrated waveguide (SIW) technology, which provides interesting features such as a high directive beam with frequency scanning capabilities, and a simple feeding network, making it well suited for microwave applications. Phase and leakage constants are adjusted to yield a directive beam with beam scanning over a wide range of angles (from -30° to 30°). The presented 25-cell LWA has a wide impedance bandwidth of 20% around 15 GHz with high efficiency and operates with peak gains of about 9 dBi throughout the frequency scan range of 13.5-16.5 GHz. A prototype is fabricated using standard substrates, and measured results show an excellent agreement with the simulated results, validating the proposed concepts. © 2002-2011 IEEE
  6. Keywords:
  7. Broadside radiation ; Frequency scanning antenna ; Leaky-wave antenna (LWA) ; Mode-matching technique ; Substrate integrated waveguide (SIW) ; Electric impedance ; Microwave antennas ; Scanning antennas ; Substrates ; Traveling wave antennas ; Broadside radiations ; Frequency scanning ; Full-wave simulations ; Leaky wave antennas ; Microwave applications ; Mode matching technique ; Substrate integrated waveguide technologies ; Wide impedance bandwidths ; Substrate integrated waveguides
  8. Source: IEEE Antennas and Wireless Propagation Letters ; Volume 19, Issue 2 , 2020 , Pages 363-367
  9. URL: https://ieeexplore.ieee.org/abstract/document/8949487