Investigations of Isolation Improvement Techniques for Multiple Input Multiple Output (Mimo) Wlan Portable Terminal Applications

Chou, Hsi‐Tseng; Cheng, Hao-Chung; Hsu, Houtse; Kuo, Li-Ruei

doi:10.2528/pier08090905

Cited by 50 publications

(34 citation statements)

References 28 publications

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“…Surface current distribution is one of the key factors in deciding the amount of mutual coupling between the antennas. By altering the ground surface current distribution, a MIMO system with reduced mutual coupling is developed in [5]. Employing EBG structures on the ground plane is another technique to reduce the mutual coupling between MIMO elements [6][7][8].…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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show abstract

“…The vertical stub can be viewed as a reflector which can reduce the mutual coupling by separating the two antennas' radiation patterns [13,27]. The two rectangular slots cut on the ground plane change the current distribution which further decreases the mutual coupling [23]. Figure 5 shows the simulated surface current distribution of the antenna with and without the decoupling structure.…”

Section: Analysis Of Working Mechanismmentioning

confidence: 99%

“…Then, this method is further used on a printed microstrip antenna array for mobile applications [17][18][19][20]. High port isolation can also be achieved by etching slits or slots on the ground plane [21][22][23][24][25]. It is noticed that none of these antennas mentioned above are designed for both the 2.4/5.2/5.8 GHz WLAN bands and 2.5/3.5/5.5 GHz WiMAX bands.…”

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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“…By etching slots on the ground plane [5,6], mutual coupling was also suppressed, which can be thought as a bandstop filter between antennas and this effectively reduces current flow between antennas. Similarly, insertion of a ground strip between antennas also shows a good isolation between dual elements [7]. The electromagnetic characteristics of photonic band-gap materials [8] allow reducing the interactions between the antenna and its backward environment.…”

Section: Introductionmentioning

confidence: 99%

Port Isolation Enhancement by Connecting Dual-Element Antenna for Mimo Communications

Ni¹,

Chen²

2014

PIER C

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Abstract-This paper presents a general method to isolate the compact dual-element antenna for mobile radio communications. The basic concept to cancel the coupling current is proposed, and two individual implemental solutions, connecting the transmission lines and the antenna elements, are illustrated respectively. Two examples targeted at 2.4 GHz ISM band have been implemented for the practical cellular phone environment. The antennas are well designed followed by the proposed principle. The result shows that the magnitude of S 21 between two ports can be no higher than −10 dB in the interested bandwidth after applying the proposed methods. Good agreements are observed between measurements and simulations. It is suitable for application to mobile terminals due to its relatively low profile and good MIMO performance.

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Investigations of Isolation Improvement Techniques for Multiple Input Multiple Output (Mimo) Wlan Portable Terminal Applications

Cited by 50 publications

References 28 publications

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

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

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

Port Isolation Enhancement by Connecting Dual-Element Antenna for Mimo Communications

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