A Novel Isolation Technique for Closely Spaced PIFAs for UMTS Mobile Phones

Chebihi, A.; Luxey, Cyril; Diallo, Aliou; Thuc, Philippe Le; Staraj, Robert

doi:10.1109/lawp.2008.2009887

Cited by 93 publications

(54 citation statements)

References 12 publications

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“…These EBG structures provide substantial decoupling but suffer from large surface area, high cost of manufacturing and complicated design. To avoid increasing the volume and weight of the antenna, authors in [19][20][21][22][23] propose a neutralization technique to cancel out the reactive coupling between two closely placed radiators. This is done by physically connecting the multiple antenna elements with a transmission line.…”

Section: Introductionmentioning

confidence: 99%

“…This is done by physically connecting the multiple antenna elements with a transmission line. This method has been initially used on a suspended PIFA antenna structure as in [19][20], and was further adopted in a printed microstrip antenna array for mobile applications [21]. The results in [19]- [21] show that this technique provides an isolation of about 18 dB between two antenna elements.…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

“…Thus, integrating multiple antennas closely in a small and compact mobile device while maintaining good isolation between them is a challenging task. A lot of efforts have been made to reduce the mutual coupling or enhance the isolation between closely placed antenna elements [7][8][9][10][11][12][13][14][15][16]. Decoupling networks for enhancing the port isolation between two closely spaced antennas are presented in [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Various ground branches such as T-shaped branch [8][9][10], vertical branch [11], dual inverted L-shaped branches [12], tree-like structure branches [13] are applied to achieve high isolation. By linking two planar inverted F antennas (PIFAs) with a suspended strip to cancel the reactive coupling, the isolation between them can be improved [14][15][16]. Then, this method is further used on a printed microstrip antenna array for mobile applications [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Compact Dual-Band Printed Diversity Antenna for Wimax/Wlan Applications

Xiong¹,

Gao²

2012

PIER C

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Abstract-A compact dual-band multiple-input-multiple-output (MIMO)/diversity antenna is proposed. This antenna is designed for 2.4/5.2/5.8 GHz WLAN and 2.5/3.5/5.5 GHz WiMAX applications in portable mobile devices. It consists of two back-to-back monopole antennas connected with a T-shaped stub, where two rectangular slots are cut from the ground, which significantly reduces the mutual coupling between the two ports at the lower frequency band. The volume of this antenna is 40 mm * 30 mm * 1 mm including the ground plane. Measured results show the isolation is better than −20 dB at the lower frequency band from 2.39 to 3.75 GHz and −25 dB at the higher frequency band from 5.03 to 7 GHz, respectively. Moreover, acceptable radiation patterns, antenna gain, and envelope correlation coefficient are obtained. These characteristics indicate that the proposed antenna is suitable for some portable MIMO/diversity equipments.

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“…상호 근접되어진 두 안테나 사이의 격리 도를 향상시키는 방법에는 다수의 슬릿을 안테나 접 지 면에 배치시키거나 [1], [2] , 소위 중화 선로(neutralization line)라고 불리는 단락 선로를 두 안테나 방 사 소자 사이에 접속시키는 방법 [3], [4] 등이 있다. 그 러나 안테나의 접지 면에 놓인 슬롯은 안테나의 후 방 방사를 증가시키게 되며, 두 안테나 사이의 단락 선로를 접속시키는 방법은 단락 점의 최적 위치를 선정하는 방법이 쉽지 않다.…”

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Isolation Enhancement between Two Dual-Band Microstrip Patch Antennas Using EBG Structure without Common Ground Plane

Choi¹,

Lee²

2012

The Journal of Korean Institute of Electromagnetic Engineering

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In order to enhance the isolation level between two dual-band E-slot microstrip patch antennas, EBG structure which operates in UMTS Tx(1.92～1.98 GHz) and Rx(2.11～2.17 GHz) band is proposed. The proposed EBG structure made with a periodic array of two different size EBG unit cells which has a modified mushroom-type for isolation improvement between two antennas. They do not share a common ground plane of the microstrip patch antenna. Overall size of the fabricated antenna is 210.5 mm×117 mm. The two different EBG unit cell sizes are 15.6 mm×4 mm and 17.4 mm×4 mm, respectively. It was etched on the FR-4 substrate(thickness=3.93 mm, εr=4.6). The experiment results show that the isolation level between antennas in Tx/Rx band were improved by about 9 dB and 12 dB, respectively, through the use of the proposed EBG structure.

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A Novel Isolation Technique for Closely Spaced PIFAs for UMTS Mobile Phones

Cited by 93 publications

References 12 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

Compact Dual-Band Printed Diversity Antenna for Wimax/Wlan Applications

Isolation Enhancement between Two Dual-Band Microstrip Patch Antennas Using EBG Structure without Common Ground Plane

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