Scattering Suppression in a 4G and 5G Base Station Antenna Array Using Spiral Chokes

Sun, Hai-Han; Zhu, He; Ding, Can; Jones, Bevan; Guo, Y. Jay

doi:10.1109/lawp.2020.3019930

Cited by 73 publications

(33 citation statements)

References 10 publications

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“…Finally, the cross‐band and polarization isolations are larger than 30 dB in the proposed work. Nevertheless, in References 8,10, the cross‐band and polarization isolations are not satisfactory. In Reference 15, the LB polarization isolation is deteriorated.…”

Section: Resultsmentioning

confidence: 98%

“…Please note that in the proposed work, the HB antenna distance is smaller than those of the referential works. IBD is not considered in 8,13 . Thus, in these works, the HB antennas have to be placed far away (separation distance much larger than 0.5 λ H0 ) to obtain an in‐band isolation (IBI) of >20 dB.…”

Section: Resultsmentioning

confidence: 99%

“…A comprehensive performance comparison is given in Table 3. Without loss of generality, antenna arrays with various CBD methods (ETA 8,10 and isolating surface 13,15 ) are included. Please note that in the proposed work, the HB antenna distance is smaller than those of the referential works.…”

Section: Resultsmentioning

confidence: 99%

“…ETA yields low scattering when it is illuminated by the high-band (HB) wave. It can be devised by loading current choke [7][8][9] or transforming the low-band (LB) radiator into a band-pass frequency selective surface (FSS). 10,11 In stacked arrays, the works in [12][13][14][15] proposed that an isolating surface, typically a band-stop FSS, can effectively isolate the LB and HB radiating environments.…”

Section: Introductionmentioning

confidence: 99%

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Dual‐band stacked base station antenna array with high isolation

Chu

2022

Int J RF Mic Comp-Aid Eng

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A high‐isolation dual‐band base station antenna array is proposed. At first, a 5‐element high‐band (HB) dipole antenna array with inter‐element distance of 0.4 λH0 (the free‐space wavelength at the center frequency of the HB) is decoupled. With the main antenna decoupling surface (ADS), metal baffles and auxiliary ADS, the E‐plane and H‐plane couplings can be reduced to <−23.1 dB (<−11.4 dB without decoupling) and <−22.6 dB (<−14.8 dB without decoupling), respectively. The dual‐layer ADS design successfully resolves the contradiction between decoupling performance and matching. The ground plane of the 5‐element array is then exploited as the low‐band patch radiator, forming the proposed dual‐band antenna array. Measured results show that satisfactory cross‐band isolation (>33.1 dB), in‐band isolation (>22.2 dB) and polarization isolation (>30 dB) are obtained. Stable unidirectional radiation patterns are also acquired.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dual‐band stacked base station antenna array with high isolation

Chu

2022

Int J RF Mic Comp-Aid Eng

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“…The third scattering-suppression technique exploits the insertion of lumped-element chokes with filtering properties to minimize the unwanted currents and, thus, restore the radiation pattern. Strip and spiral chokes have been proposed for this purpose in [16] and [17]. However, as drawbacks, the design processes and principle analyses are complex, and the shapes of the chokes are limited by the original antenna structure.…”

Section: Introductionmentioning

confidence: 99%

Scattering Suppression of Closely-Packed Cross-Band Patch Antennas Using Absorptive/Reflectionless Filtering Techniques

Wang

Fan

Gómez‐García

et al. 2021

IEEE Open J. Antennas Propag.

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This paper presents a novel method for cross-band scattering cancellation in closely-spaced antennas inspired by absorptive/reflectionless filtering principles. Prior-art approaches that combine a bandpass-filter (BPF) unit and an antenna in multiple-input multiple-output (MIMO) systems can improve cross-band isolation between the antenna ports. However, such procedure is ineffective in suppressing cross-band scattering, which leads to radiation-pattern distortion. This is because in closely-packed antennas each radiating element behaves as an external source for the others, so that it induces currents into them. To overcome this problem, a method originating from absorptive/reflectionless filtering techniques is reported here and applied to a dual-antenna scenario. In complementary-diplexer-based reflectionless BPFs, an absorptive bandstop-filter-(BSF)-type branch loaded by a resistor is utilized to absorb the out-of-band RF power not transmitted by the main BPF channel. By using this concept in a first patch-type antenna and owing to the reciprocity principle, the RF coupled energy or induced currents in the first antenna due to the surrounding antenna can be absorbed. Thus, radiation-pattern distortion for the surrounding antenna is avoided. Equivalent-circuit, simulated, and measured results are provided to show the effectiveness of this engineered scattering-suppression method, which is believed to be promising for application in cross-band multi-antenna systems.

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De‐scattering Methods for Coexistent Antenna Arrays

Guo

Ziolkowski

2021

Advanced Antenna Array Engineering for 6G and Beyond Wireless Communications

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Scattering Suppression in a 4G and 5G Base Station Antenna Array Using Spiral Chokes

Cited by 73 publications

References 10 publications

Dual‐band stacked base station antenna array with high isolation

Dual‐band stacked base station antenna array with high isolation

Scattering Suppression of Closely-Packed Cross-Band Patch Antennas Using Absorptive/Reflectionless Filtering Techniques

De‐scattering Methods for Coexistent Antenna Arrays

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