Substrate integrated waveguide circularly polarized horn‐dipole antenna with improved gain

Abstract

A substrate integrated waveguide (SIW) horn antenna is combined with a dipole to achieve circular polarization (CP). First, it is established that CP can be achieved by combining a horn and a dipole. To excite the dipole, double‐sided tapered and balanced transmission lines are employed at the central part of the horn aperture. Secondly, after the position and the size of the dipole are determined, a directional circularly polarized beam in the plane of the substrate is achieved. Finally, the proposed antenna is fabricated and measured. Experimental results are in good agreement with simulations. Measured results show that an effective bandwidth of 5% for axial ratio (AR) less than 3 dB and return loss (RL) better than 10 dB from 11.8 to 12.4 GHz is achieved. In particular, the maximum gain of the proposed antenna is as high as 7.5 dBi due to the design of the horn structure. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2973–2977, 2016

The Design of Pixelated SIW Horn Antennas With Nearly Equal Beamwidths Using Binary Ink Stamp Optimization

“…The main advantage of CP lies in its immunity to multi-path interferences and polarization mismatch [10]. CP SIW horn antennas are mainly composed of two or more antenna elements to obtain orthogonal modes [11][12][13][14]. In [15] an inhomogeneous polarizer is placed in front of the antenna aperture to achieve CP.…”