Isolation Enhancement Between Two Closely Packed Antennas

Mak, A.C.K.; Rowell, Corbett; Murch, R.D.

doi:10.1109/tap.2008.2005460

Cited by 374 publications

(196 citation statements)

References 19 publications

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“…To find optimal locations of the I-shaped branch, several simulations were performed to check the isolation, return loss and radiation characteristics of the antenna. It was interesting to find these findings were in agreement with published works [11,37,38]. To evaluate the effectiveness of the I-shaped branch, the simulated reflection coefficient (S 11 ) and mutual coupling (S 21 ) of the proposed unloaded antenna with and without the line are shown in Fig.…”

Section: The Antenna Design Conceptsupporting

confidence: 85%

Compact and closely spaced tunable printed F‐slot multiple‐input–multiple‐output antenna system for portable wireless applications with efficient diversity

Elfergani

Hussaini

Rodriguez

et al. 2014

IET Science, Measurement & Technology

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In this work, miniaturized tunable two-antenna MIMO systems composed of printed F-slot shaped is developed to operate in the GPS, PCS, DCS and UMTS bands. The two-element MIMO antenna occupies a volume of 50 × 37.5 ×1.6 mm 3 , and is printed on an FR4 substrate. Initially, the frequency tunability of the MIMO antennas was verified by lumped capacitors with values between 0.75 to 2.75 pF to achieve a tuning range from 1.55 to 2.07GHz while the low mutual coupling between the radiators was accomplished by adding an I-shaped branch to a cut-away ground plane. The two antennas are then loaded with varactors to simultaneously achieve miniaturization and tunability. Simulation and measurement results demonstrate the successful implementation of a tunable MIMO with coupling reduction mechanism for a portable handheld wireless transceiver. The channel capacity of the proposed antenna is investigated and found to be close to that of an uncorrelated system with efficient diversity in which the mutual coupling across the full bandwidth was better than -13dB. Owing to the compact size and ease of manufacture, the proposed antennas can be a promising solution for adaptive MIMO systems in handheld devices.

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Section: The Antenna Design Conceptsupporting

confidence: 85%

Compact and closely spaced tunable printed F‐slot multiple‐input–multiple‐output antenna system for portable wireless applications with efficient diversity

Elfergani

Hussaini

Rodriguez

et al. 2014

IET Science, Measurement & Technology

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show abstract

“…If the current flows in same direction on the adjacent sides of both the antennas, the mutual coupling is more. Similarly, if the currents are in opposite direction, the induced mutual coupling is minimized [15]. In the proposed MIMO antenna system, the surface currents on the right arm of the first antenna and on the patch element placed in between the antennas are flowing in opposite directions as shown in Figure 10, thus minimizing the mutual coupling.…”

Section: Design Of Mimo Antenna System With Improved Isolationmentioning

confidence: 99%

Design of a Compact Two Element Mimo Antenna System With Improved Isolation

Kamili¹,

Aldhaheri²,

Talha³

et al. 2014

PIER Letters

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Abstract-A novel compact two-element MIMO (Multiple Input Multiple Output) antenna system operating from 6.1-7.8 GHz is proposed for wireless applications. The developed antenna system resonates at 6.8 GHz frequency, giving an impedance bandwidth of 25% (based on S 11 < −10 dB). An efficient technique is proposed to reduce the mutual coupling developed in the antenna system by employing a simple microstrip patch element in between the antennas. Using the proposed method, the mutual coupling is reduced to around −33 dB at the resonant frequency and maintaining the overall mutual coupling less than −20 dB in the operating band. The experimental models are developed for both the MIMO systems, i.e., without and with patch element between the antennas and the results are compared with simulated results. Also, Envelope Correlation Coefficient (ECC) between the two antennas is calculated and compared.

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“…일반적으로 MIMO 안테나 는 휴대 단말기, LTE 라우터, USB dongle 등 휴대용 무선 통신 기기에서 다양하게 사용되고 있다. 최근 휴대용 무 선 통신 기기의 고집적화, 소형화에 따라 안테나를 설계 할 수 있는 공간이 더욱 협소해지고 있어 근접한 두 안테 나 사이의 격리도 저하 문제가 대두되고 있다 [3], [4] . 공진기 를 사용하지 않고 격리도를 상승시키기 위한 기존 연구 로는 첫째, 두 안테나 사이를 반파장 이상 이격시키는 방 법이 있는데, 이는 휴대 단말기의 특성상 제한된 공간으 로 사실상 실제 제품에 적용시키기 많은 어려움이 있다 [5], [6] .…”

Section: ⅰ 서 론unclassified

Analysis of Antenna Isolation Using Decoupling Structure

Lee¹,

Kim²,

Kim³

et al. 2015

The Journal of Korean Institute of Electromagnetic Engineering

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In this paper, isolation enhanced antenna using isolating resonator was proposed. Two loop type antennas were designed to operate at Wi-Fi band(2.4～2.5 GHz), in symmetry to the center, and are closely located to each other. In order to enhance isolation characteristics at Wi-Fi bands, isolating resonator was designed between the two loop type antennas. The proposed isolating resonator is a slot type antenna that enhances isolation with the control of the size, and by adjusting the value of capacitor(CD) the resonant frequency of the isolating resonator can easily be adjusted to enhance isolation characteristic at the target frequency. . 공진기 를 사용하지 않고 격리도를 상승시키기 위한 기존 연구 로는 첫째, 두 안테나 사이를 반파장 이상 이격시키는 방 법이 있는데, 이는 휴대 단말기의 특성상 제한된 공간으 로 사실상 실제 제품에 적용시키기 많은 어려움이 있다 [5], [6] . 둘째, 안테나 사이에 stub나 EBG(Electromagnetic BandGap), Neutralization line, suspended-line 같은 구조물을 추 가하는 방법이 있다 [7] . 하지만 Stub나 EBG의 경우, 그라 ⓒ

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Isolation Enhancement Between Two Closely Packed Antennas

Cited by 374 publications

References 19 publications

Compact and closely spaced tunable printed F‐slot multiple‐input–multiple‐output antenna system for portable wireless applications with efficient diversity

Compact and closely spaced tunable printed F‐slot multiple‐input–multiple‐output antenna system for portable wireless applications with efficient diversity

Design of a Compact Two Element Mimo Antenna System With Improved Isolation

Analysis of Antenna Isolation Using Decoupling Structure

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