Abstract
This research presents a triple-aperture waveguide antenna as the primary feed of parabolic reflectors. The proposed antenna is able to rectify the asymmetry and also achieve a symmetrical unidirectional beam through the application of two parasitic coupling apertures. The design of the antenna is that of a rectangular waveguide (radiating aperture) vertically jointed to the two coupling apertures of the same measurement widthwise (i.e., one stacked on top and the other underneath) to achieve the symmetrical beam. The rectangular waveguide is 97.60 mm and 46.80 mm in width (a) and height (b), respectively, to propagate the WLAN frequency band of 2.412–2.484 GHz. Simulations were carried out to determine the optimal antenna parameters and an antenna prototype was subsequently fabricated and tested. The simulated beamwidths in theE- andH-planes at-3 dB were equally 67° (i.e., 67° for both theE- andH-planes) and at-10 dB also equally 137°, while the measured results at-3 dB were equally 65° and at-10 dB equally 135°. The simulation and measured results are thus in good agreement. The simulated and measured antenna gains are, respectively, 8.25 dBi and 9.17 dBi. The findings validate the applicability of the antenna as the prime feed for rotationally symmetric parabolic reflectors.
Highlights
In recent decades, the point-to-point communications systems have rapidly advanced and become one of the brightest areas of the communications business [1]
The results indicate that b1 exerts little influence over |S11| and the optimal coupling aperture height (b1) is 0.236λ, at which the beamwidths at −3 dB and −10 dB in both the E- and H-planes are symmetrical
The proposed antenna is operable in the 2.30–2.60 frequency range (12.245%), which covers the WLAN frequency, for |S11| < −10 dB
Summary
The point-to-point communications systems have rapidly advanced and become one of the brightest areas of the communications business [1]. Horn antennas, which are a principal component of the point-to-point communication systems, were first developed nearly a century ago for military and scientific purposes but were not widely adopted until World War II. To enhance the performance of the point-to-point communication requires a narrow-beam antenna with high gain [5], and one possible method to achieve the narrow beam is through a parabolic metal reflector antenna. The feeding point of the parabolic reflector should be located at the reflector focus to generate the narrow beam (i.e., pencil beam). In [6], the authors reviewed publications on the point-to-point communication and documented that the generation of the pencil beam requires an antenna with symmetrical beam as the primary feed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
