Abstract
In this paper, an 8 × 2-element 60-GHz band circularly polarized post-wall waveguide slot array antenna loaded with dipoles is proposed. The antenna is composed of a feeding circuit, radiating slots on radiating waveguides, and dipoles for polarization conversion. By integrating the feeding circuit and the radiating waveguides into a single dielectric layer, the total number of dielectric layers is reduced to two which greatly increases ease of mass production. The feeding circuit divides power into two and feeds the two radiating waveguides from their center. 8 × 2 radiating elements are composed of a slot and a dipole placed on the radiating waveguides. The elements are designed by standing-wave excitation. The antenna is fabricated by printed circuit board technology and its dimensions are 44.5 × 20.0 × 2.16 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> . The measured results show a 2.1-dB axial ratio, 15.6-dBi gain, and 57.2% efficiency at 61.5 GHz. The proposed antenna realizes a circular polarized array antenna with the minimum number of dielectric layers and electric performance comparable to conventional antennas.
Highlights
The millimeter-wave band enables high data rate wireless communication because wider frequency bands are available than in the microwave bands [1]
Post wall waveguides [5], known as substrate integrated waveguides (SIW) [6], feeding circuits are widely used in the millimeter-wave band because of their low transmission losses [7]
We propose a 60-GHz-band circular polarized array antenna with a much simpler structure than conventional ones [8]–[20] and which can be fabricated by conventional printed circuit board (PCB) technology
Summary
The millimeter-wave band enables high data rate wireless communication because wider frequency bands are available than in the microwave bands [1]. The slot array antenna [12] is fabricated by a printed circuit board (PCB) process and suitable for mass production This antenna requires a reflector which makes the structure complex. A circularly polarized slotted SIW cavity antenna has a simple feeding circuit [13], [14] and 4 × 4 elements are placed on the cavity and fed by a single coaxial probe It requires an air spacer between the slots and dipoles which weaken the physical strength and complicates production. The target bandwidth is channel two of IEEE 802.11ad [1], which is 59.5 - 61.5 GHz. The antenna is suitable for base stations and enables more practical mass production because of the simple structure and the fabrication by PCB technology. The design method and characterization of the fabricated antenna are detailed
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