SIW cavity-backed circularly polarized square ring slot antenna with wide axial-ratio bandwidth |
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| Affiliation: | 1. School of Electronics and Information Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi, 710049, China;2. Deptartment of Electrical Engineering, KU Leuven, Kasteelpark Arenberg 10, Box 2444, 3001 Leuven, Belgium;3. Interuniversity Microelectronics Center (IMEC), Kapeldreef 75, 3001 Leuven, Belgium;1. Dept. of Electronics and Communication Engineering, Dr. B C Roy Engineering College, Durgapur, West Bengal, India;2. Dept. of Electrical Engineering, National Institute of Technology, Durgapur, West Bengal, India |
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| Abstract: | In the proposed work, Substrate Integrated Waveguide (SIW) cavity-backed circularly polarized slot antenna for wideband operation is proposed. A square-ring-slot is etched on the top of the SIW cavity, used for radiation To generate the circularly polarized (CP) wave, the slot is placed slightly offset from the centroid of the cavity. By finely optimizing the antenna dimensions, it exhibits a wide axial-ratio (AR) bandwidth of 789 MHz (7.1%) ranging from 10.64 to 11.45 GHz. Moreover, the radiating slot is excited by an SIW based feed by an inductive window, which lead to a wide impedance matching over 1.74 GHz ranging from 9.92 to 11.67 GHz. Due to the SIW cavity-backing structure, the antenna offers unidirectional radiation patterns while maintaining a low-profile and planar compatibility. To validate the proposed design, the antenna is fabricated and experimentally tested in terms of reflection coefficients, AR, gain, and radiation patterns. The simulated and measured results reveal good mutual agreement. Moreover, the proposed antenna is very useful for wideband applications operating in X-band (8–12 GHz) |
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| Keywords: | Cavity-backed antenna Wideband Circular polarization Square ring slot SIW |
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