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- Quan, Yu, et al.
(författare)
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A Double-layer Multibeam Antenna with 45° Linear Polarization Based on Gap Waveguide Technology
- 2022
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Ingår i: IEEE Transactions on Antennas and Propagation. - 0018-926X .- 1558-2221. ; 70:1, s. 56-66
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, a double-layer 1-D multibeam antenna based on gap waveguide (GWG) technology is proposed. The bottom layer is the beamforming network (BFN), which is composed of four cruciform couplers and two -45° phase shifters realized by groove gap waveguides. Four output ports of the BFN are connected to the slot arrays on the top layer through 180° E-plane bends. The output amplitudes of the BFN are -6.3 ± 0.5 dB and the phase errors are within ± 14° from 26 to 32 GHz with a bandwidth of 20%. To relieve the grating lobe problem, groove gap waveguides are transited to ridge gap waveguides on the top layer and the slot array is fed from ridge gap waveguides. Due to the topology of the BFN, the slot array is oriented along the diagonal plane and as a result, the multibeam antenna is 45° linearly polarized. To handle the dip emerging in the side beam caused by the finite ground of the BFN, several metal fences working as a soft surface are applied to suppress the edge diffractions. Besides, the gain is increased by 0.78 dB compared to the case without metal fences at 29 GHz. Thanks to the low-loss property of gap waveguide technology, high gain and high radiation efficiency are obtained. The maximum gain is 17.46 dBi with the beam direction at -11° for Port 1 and 16.51 dBi with the beam direction at 37° for Port 2. The simulated radiation efficiency is above 97% for both Port 1 and Port 2.
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| 2. |
- Quan, Yu, et al.
(författare)
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A Wideband End-fire Double Dipole Antenna Fed from Double-ridge Gap Waveguides for Multibeam Array Application
- 2022
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Ingår i: IEEE Antennas and Wireless Propagation Letters. - 1548-5757 .- 1536-1225. ; 21:4, s. 760-764
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Tidskriftsartikel (refereegranskat)abstract
- In this letter, an end-fire double dipole antenna fed from double-ridge gap waveguides (DRGWG) is proposed and designed for multibeam array application. Two dipoles with different lengths are connected to the extension of the ridges of DRGWG in series. Different resonances can be generated by these two dipoles, which contributes to a wide impedance bandwidth, high gain and stable radiation patterns across the working band. The double dipole antenna is vertically polarized and has a wide H-plane beam width suitable for beam scanning application. To verify the performance of the double dipole antenna, a butler matrix is designed based on ridge gap waveguides (RGWG) to feed a 1*4 double dipole array arranging in H-plane. The maximum gains achieved for Port 1 and Port 2 are 13.94 dBi and 12.68 dBi respectively. Besides, the simulated radiation efficiencies for Port 1 and Port 2 are both above 94%.
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