Dual-Frequency Decoupling for Two Distinct Antennas

Albannay, Mohammed M.; Coetzee, Jacob; Tang, Xinyi; Mouthaan, Koen

doi:10.1109/lawp.2012.2226635

Cited by 17 publications

(12 citation statements)

References 13 publications

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“…In [17], [18], a decoupling and matching network is proposed based on even-odd mode analysis. [17], [19], [20] discuss improving dual-band isolation using lumped elements between the antenna feeds. Mak in [21] proposes a field cancellation element to artificially create a coupling path to improve the antenna isolation.…”

Section: Previous Workmentioning

confidence: 99%

Impact of Using Resistive Elements for Wideband Isolation Improvement

Venkatasubramanian

Lehtovuori

et al. 2017

IEEE Trans. Antennas Propagat.

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Abstract-Improving the isolation between antenna elements in compact arrays has been a major focus of recent research. In this paper, we present ideas to improve the wideband isolation between closely spaced antennas. We do this by connecting lumped lossy (resistive) elements between the antenna feeds. A simple analytical expression is provided to compute the impact of resistive elements on efficiency to analyse the power lost in the resistive element. Three configurations of decoupling circuits are designed and fabricated for two closely spaced monopoles operating at 2.4 GHz. The decoupling circuit contains transmission lines of different lengths at the antenna inputs such that the mutual admittance between the antenna elements is 1) resistive, 2) resistive and inductive, or 3) resistive and capacitive. Lumped elements are then connected between the transmission lines followed by matching circuit. The paper shows that with configurations 2) and 3) we can improve the wideband isolation compared to 1), as well as compared to using only lossless elements. The wideband isolation was improved by 17.6 dB across a 200 MHz band at 2.4 GHz, with a final isolation level of 20 dB over that band. Better than 30 dB isolation was achieved across a narrower band of 55 MHz. The proposed technique provides wideband isolation improvement for multiple-input multipleoutput (MIMO) as well as narrowband performance with large isolation suitable for in-band full-duplex (FDX) applications. The impact on efficiency is investigated to verify that the advantages from the improved wideband isolation outweighs the possible reduction in overall efficiency.

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Section: Previous Workmentioning

confidence: 99%

Impact of Using Resistive Elements for Wideband Isolation Improvement

Venkatasubramanian

Lehtovuori

et al. 2017

IEEE Trans. Antennas Propagat.

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“…At present, most antenna decoupling methods use a method of loading decoupling networks between antennas. A dual‐frequency decoupling for two distinct coupled antennas is presented in a study . But the maximum coupling of the two antennas with 4.5 mm spacing with recommended decoupling network in the entire frequency bands exceeds −14 dB.…”

Section: Introductionmentioning

confidence: 99%

Higher isolation dual‐frequency distinct coupled antennas based on integrated filtering structures

Zhai

Shi

et al. 2018

Micro & Optical Tech Letters

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This letter proposes a new higher isolation dual‐frequency distinct coupled monopole antenna system by using integrated low‐pass and high‐pass filtering structures. The isolation of the dual‐frequency distinct antennas at 2.4 GHz and 3.6 GHz can be successfully improved by 24 dB under the stable radiation performances. The measurement results are consistent with the simulation results of the fabricated prototype, which verifies the feasibility of this method. The present compact higher isolation frequency distinct antennas could be chosen as a new candidate for integrated multiband anti‐interference terminal systems.

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“…Decoupling method often used for dual-band is to connect each antennas by decoupling network such as lines or circuits [3,4,5]. However, decoupling network generates electrical loss and restricts antenna arrangement.…”

Section: Introductionmentioning

confidence: 99%

A decoupling method for MIMO antenna using trifurcation elements

2017

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Technology of MIMO using multiple antennas and Carrier Aggregation operating multiple frequency bands are introduced in a mobile terminal to improve communication capacity. However, if plural MIMO antennas are installed closely, mutual coupling between the antennas must be reduced to suppress deterioration of radiation efficiency and increase of correlation coefficient. In this paper, we proposed a decoupling method for dual-band using trifurcation elements. Moreover, it is confirmed to be broadened decoupling bandwidth by optimizing branch width and length.

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Dual-Frequency Decoupling for Two Distinct Antennas

Cited by 17 publications

References 13 publications

Impact of Using Resistive Elements for Wideband Isolation Improvement

Impact of Using Resistive Elements for Wideband Isolation Improvement

Higher isolation dual‐frequency distinct coupled antennas based on integrated filtering structures

A decoupling method for MIMO antenna using trifurcation elements

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