A novel circularly polarized cavity backed SIW antenna with capability to change polarization diversity by a reconfigurable polarizer structure

Abstract

This article examines a substrate integrated waveguide (SIW) cavity‐backed circularly polarized diversity antenna. In the proposed novel antenna, parasitic patch and reconfigurable diodes are used to change polarization diversity from left hand to right hand and vice versa, respectively. In addition to, what makes distinctive proposed antenna in compared with similar works, is ability to change linear polarization from a SIW slot to circularly polarization by a parasitic patch. Chopping off two diagonally opposite corners makes the resonance frequency of the mode along this diagonal to be higher than that for the mode along the unchopped diagonal. By exciting parasitic patch with a slot along axes of it the orthogonal modes are generated which causes to CP. The comparison between simulation and measurement results validate antenna design. The measured impedance BW (VSWR < 2) for state 1 and 2 are 22.18% (11.86‐14.82 GHz) and 21.68% (11.88‐14.77 GHz), and The measured 3‐dB AR BW for states 1 and 2 are about 11.46% (11.43‐12.82 GHz) and 11.23% (11.43‐12.79 GHz), respectively. Finally, the measured maximum gain is 9.81 dBic.

Wideband low cost FR4 epoxy based antenna with H‐shaped slot for V‐band applications

“…With mm‐wave the size of the wavelength decreases; therefore, in order to behave like a proper metallic sidewall and to prevent any radiation leakage between the vias below conditions should be met. where λ g is the wavelength for the highest operating frequency, while d and s represent the diameter of the vias and spacing between the vias, respectively. The standard equation to determine the width and length of the vias 12 is …”

“…The following equation represents the relationship between the resonance frequency and the geometrical dimensions of antenna 12 where f mn and ε r express the resonance frequency of the cavity and permittivity, respectively.…”

“…where λ g is the wavelength for the highest operating frequency, while d and s represent the diameter of the vias and spacing between the vias, respectively. The standard equation to determine the width and length of the vias 12 is…”

“…Substrate integrated waveguide (SIW) antennas are used frequently for high frequency applications such as mm-wave or even centimeter wave applications. [12][13][14][15] These antennas generate a rectangular waveform with the help of the sidewalls that are created by aligning the plated through holes (vias) side by side. SIW antennas have the advantage of wide bandwidth, high gain, high efficiency, light weight and low cross polarization.…”

Broadband low‐profile monopole antenna design with coplanar waveguide , substrate integrated waveguide, and slots based on characteristic mode theory

“…The substrate integrated waveguide (SIW) is used to design many high-quality microwave devices, such as antennas, power dividers, directional couplers, filters, due to its advantages of low profile, low loss, low interference, and easy integration with planar circuits. [1][2][3][4][5][6] In recent years, some new technologies based on microwave integrated circuit manufacturing have been proposed, such as slot antenna and antenna array etched on SIW. At present, with the great progress in miniaturization of active and passive electronic devices, the antenna has become the largest and heaviest component in many electronic systems, which limits the development of miniaturization and integration of microwave equipment.…”