Substrate-Integrated-Waveguide-Based Complementary Source Array With Enhanced Beamwidth

A complementary source array with enhanced beamwidth is presented based on the substrate-integrated waveguide (SIW) in this communication. The orthogonal complementary source consists of a SIW slot and a vertical monopole, of which the radiation pattern is heart-shaped, pointing to the direction per...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2021-08, Vol.69 (8), p.5136-5141
Main Authors: Sun, Kai, Chen, Yongpin, Liu, Sihao, Zhao, Yanwen, Yang, Deqiang
Format: Article
Language:English
Subjects:
Antenna arrays
Antenna radiation patterns
Arrays
Complementary sources
Current
Excitation
linear array
Magnetic resonance imaging
Magnetosphere
Monopoles
Radiation
Slot antennas
Substrate integrated waveguides
substrate-integrated waveguide (SIW)
Substrates
wide beamwidth
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Summary:A complementary source array with enhanced beamwidth is presented based on the substrate-integrated waveguide (SIW) in this communication. The orthogonal complementary source consists of a SIW slot and a vertical monopole, of which the radiation pattern is heart-shaped, pointing to the direction perpendicular to both slot and monopole. To achieve an enhanced beamwidth from the heart-shaped pattern, the complementary sources are cascaded to form an array. In particular, the slots are etched alternately on both sides of the central axis to achieve an in-phase excitation, while the monopoles are uniformly loaded with an alternate antiphase excitation. This arrangement makes the heart-shaped pattern of each complementary source element alternately point to either side of the array axis, so that the synthesized radiation beamwidth is enhanced in the E-plane. Based on the proposed idea, a nine-element line array is designed, fabricated, and tested. Compared with the same-sized referenced SIW slot array with an E-plane half-power beamwidth (HPBW) of only 80°, the proposed complementary source array extends the HPBW to 180°.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2021.3060058