Decoupling Between Extremely Closely Spaced Patch Antennas by Mode Cancellation Method

Sun, Libin; Li, Yue; Zhang, Zhijun

doi:10.1109/tap.2020.3030922

Cited by 105 publications

(53 citation statements)

References 39 publications

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“…Obviously, the reported works on decoupling require making a trade-off between polarizations, radiation patterns, and radiating apertures, that is, compromising one degree of freedom to reduce the decoupling difficulty, which implies that the radiation properties or sizes of the MPAs have inevitably deteriorated. As seen, [5][6][7][8][9][10][11][12][13][14][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] mainly concentrate on the decoupling between the two-patch array, each port works with two radiating apertures of its respective patch (i.e., as port 1 is excited, the patch 1 works and the patch 2 is isolated, and vice versa when port 2 is excited), which leads to a larger overall size of antennas and a higher profile. Although the antenna in ref.…”

Section: Comparisonmentioning

confidence: 99%

“…29,30 Besides, decoupling can also be realized by placing the coupled antenna element or port at the near-field nulls of the operating element, which could be naturally available 31,32 or obtained by constructing. 33 However, multipatch antennas with decoupling structures usually suffer from an oversized and high profile compared to multiports single patch antennas.…”

Section: Introductionmentioning

confidence: 99%

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Co‐linear polarization decoupling of two feeding ports in a single patch antenna without radiation patterns deterioration

Deng

Liu

et al. 2021

Int J RF Mic Comp-Aid Eng

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In this paper, a novel decoupling scheme is proposed to suppress the mutual coupling between the two ports of a single patch antenna (SPA), while maintaining the radiation properties of each port with co-linear polarization, co-radiating aperture, and broadside radiation patterns without deterioration in gain. For this purpose, a pair of λ/4 nonradiative stubs are introduced and loaded symmetrically in the SPA. Thanks to the good feature that the nulls of the composite fields of TM 20 and TM 30 modes are present only near the coupled port, both radiating apertures of the SPA can operate simultaneously.Moreover, the decoupling principle, equivalent transmission-line models, and design guidelines are extensively illustrated. The measured results show that each port of the SPA has a broadside radiation pattern with co-linear polarization and about 7-dBi gain under isolation improvement. As such, this two-port SPA, with the size of 0.41*0.37*0.04*λ 0 3 , can be equivalent to a two-patch antenna array with 0 edge-to-edge distance. Most importantly, the proposed decoupling method is achieved without compromise in the three degrees of freedom (i.e., co-polarization, similar radiation pattern, and co-radiating aperture), which is a tough challenge nowadays. This decoupling approach allows the two-port SPA could be an alternative solution in MIMO systems or in-band full-duplex systemsco-radiating aperture, microstrip patch antenna, mutual coupling, port-to-port decoupling, radiation pattern, two feeding ports

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Section: Comparisonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Co‐linear polarization decoupling of two feeding ports in a single patch antenna without radiation patterns deterioration

Deng

Liu

et al. 2021

Int J RF Mic Comp-Aid Eng

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“…A complex DGS is proposed in Saurabh and Meshram 21 achieve significant isolation between rhombus‐shaped patch antennas for a sub 6 GHz frequency band, which is not suitable for compact devices. In Sun et al, 22 a relatively simple inductance‐based isolation technique is proposed that achieves about 15 dB isolation between extremely close square patch antennas, however, patch antennas are fed directly with the coaxial probe, which is not considered compatible for thicker substrates and larger arrays.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, many efforts have been made to achieve higher isolation between two closely spaced antenna elements [18][19][20][21][22] ; however, most of the works presented multilayer structures with DGS and vias, which increases design and fabrication complexity. In Sun and Cao, 18 six parallel passive metallic strips are used to achieve higher isolation of 42 dB between two square patch antennas, however, its design technique is a little complex.…”

Section: Introductionmentioning

confidence: 99%

A simple and modular MIMO antenna system for closely spaced patch antennas

Abbasi

Aziz

Malik

et al. 2022

Micro & Optical Tech Letters

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A simple, low cost and modular decoupling technique is proposed to achieve high isolation between very close antenna elements of a multiple-inputmultiple-output (MIMO) system without any complex decoupling structure, vias, or defected ground structure (DGS). A rectangular thin parasitic strip is used to decouple square patch elements, which are separated by an extremely close distance of λ 0.018 at 6 GHz. The proposed technique has achieved more than 40 dB isolation between MIMO antenna elements with a minimum return loss of 22 dB. A straightforward three-step method is also proposed to shift the resonance frequency to some other frequency with similar isolation and impedance matching. All the important characteristics and performance parameters of the proposed design technique are analyzed, simulated, and verified through the measurement of the fabricated prototype.

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“…As a consequence, mutual interference among the antenna elements must be considered, and decoupling becomes necessary for their proper operation [1]- [3]. Most of previous studies on this subject have focused on in-band decoupling to improve the isolation between the antenna ports [4]- [6]. However, cross-band decoupling is also relevant, since the coupling from cross bands causes undesired effects, such as radiation-pattern distortion.…”

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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Decoupling Between Extremely Closely Spaced Patch Antennas by Mode Cancellation Method

Cited by 105 publications

References 39 publications

Co‐linear polarization decoupling of two feeding ports in a single patch antenna without radiation patterns deterioration

Co‐linear polarization decoupling of two feeding ports in a single patch antenna without radiation patterns deterioration

A simple and modular MIMO antenna system for closely spaced patch antennas

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

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