A Systematic Approach to Design Spatial Filtenna for Aperture-Shared Base-Station Array

In multi-band aperture-shared base-station arrays, the blockage of lower band (LB) elements on higher band (HB) radiation causes HB pattern distortion. Some methods such as loading frequency selective surface (FSS) to LB radiator have been proposed, but they inevitably affect the performance of LB a...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2023-10, Vol.71 (10), p.1-1
Main Authors: Wang, Yu, Su, Huafeng, Dai, Rong Chao, Chen, Li Tao, Ye, Liang Hua, Zhang, Xiu Yin
Format: Article
Language:English
Subjects:
Antenna arrays
Antenna design
Antennas
Aperture antennas
Aperture-shared array
Apertures
base-station antenna
blockage effect reduction
Capacitors
Circuit design
Current distribution
Dipole antennas
Equivalent circuits
Filtration
Frequency selective surfaces
impedance matching
Integrated circuit modeling
pattern distortion
Prototypes
Radiators
spatial-filtering antenna
Unit cell
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Summary:In multi-band aperture-shared base-station arrays, the blockage of lower band (LB) elements on higher band (HB) radiation causes HB pattern distortion. Some methods such as loading frequency selective surface (FSS) to LB radiator have been proposed, but they inevitably affect the performance of LB antenna. To solve this problem, this paper proposes a systematic method to design LB spatial-filtering antenna (spatial filtenna), which can efficiently suppress HB blockage effect and maintain LB performance. The design method and equivalent circuits of the LB spatial filtenna element are presented and analyzed. The prototype circuits are proposed to realize a first-order bandpass spatial-filtering response at HB and not affect the LB antenna, resulting in low HB blockage effect and maintaining LB performance. To realize the prototype circuit, a unit cell including a slot unit and tuner are incorporated to the LB radiator. Based on the proposed method, a dual-band aperture-shared base-station antenna array operating at 0.69-0.96 GHz and 3.0- 4.2 GHz is designed. The LB element has low-profile characteristic, high suppression on HB blockage effect and good performance to satisfy the requirement of base-station array antenna. The measurement results further demonstrate the proposed method.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2023.3299409