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Design and Measurement of a Probe-Fed Open-Ended Rectangular Waveguide with Four-Stacked-Coupling-Aperture DOI:10.15199/48.2019.06.13

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Point-to-point communication systems have promptly advanced and become one of the growing communication business over the late decades [1]-[2]. Particularly, point-topoint links between hosts and clients are required in numerous wireless communication systems over long distances, for examples, the microwave radio relay link, long length Wi-Fi, wireless WAN/LAN link, satellite communication, and home satellite television, etc. [2]-[4]. To increase the performance of the point-to-point communication desires a narrow-beam or pencil beam antenna with high gain [5], which is probably provided by a reflector antenna. To generate pencil beam for point-topoint communications, a symmetrical beam antenna is required for a primary feed [6], since the radiation pattern of the secondary antenna (reflector antenna) typically corresponds to that of the primary feed antenna [7]. However, it is not easy to obtain symmetrical radiation pattern because of the asymmetrical beamwidth between the yz- and xz-planes depending on the antenna structure [8]. The development of symmetrical beam antennas has been continuously researched and proceeded [9]-[12]. Among these symmetrical beam antenna designs, a tripleaperture waveguide antenna (TAWA) was lately introduced to be a primary feed antenna for reflector [11], because its structure is not complex. Nevertheless, the radiating section of TAWA is not small size. To further reduce the size of that radiating section, a probe-fed open-ended rectangular waveguide (OERW) with four-stacked-coupling-aperture (FSCA) antenna was preliminary studied for designing a symmetrical beam antenna in 2018 [12]. It was found that the effect of FSCA could transform the asymmetrical beam to be symmetry at -3 dB beamwidth. However, an equal beamwidth of both yz- and xz-planes at -10 dB could not accomplish yet. Therefore, this paper aims to continuously improve the FSCA for the better symmetrical beamwidth at -10 dB b[...]

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