A method to improve the correlation coefficient and the mutual coupling for diversity antenna

Ohishi, Takafumi; Oodachi, Noriaki; Sekine, S.; Saito, Hiroki

doi:10.1109/aps.2005.1551365

Cited by 32 publications

(33 citation statements)

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“…Consequently, the effect of mutual coupling (MC) on the achievable data rates can not be ignored. The impact of MC on channel capacity has been studied in [24][25][26][27][28][29][30][31][32]. In [24], it was shown that MC can increase system capacity, due to pattern diversity and in [25], the authors describe conditions beyond which MC will no longer affect the spatial correlation of the channel.…”

Section: Introductionmentioning

confidence: 99%

Impact of Mutual Coupling on Adaptive Switching Between MIMO Transmission Strategies and Antenna Configurations

Bhagavatula

Heath

Forenza³

et al. 2008

Wireless Pers Commun

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Adaptive switching between multiple-input multiple-output (MIMO) transmission strategies like diversity and spatial multiplexing is a flexible approach to respond to channel variations. It is desirable to obtain accurate estimates of the switching points between these transmission schemes to realize the capacity gains made possible by adaptive switching. In this paper, it is shown that the accuracy of switching point estimates for switching between statistical beamforming and spatial multiplexing is improved by taking into account the effects of mutual coupling between antenna array elements. The impact of mutual coupling on the ergodic capacities of these two transmission strategies is analyzed, by deriving expressions for the same. Adaptive switching between combinations of transmission strategies and antenna array configurations (using reconfigurable antenna arrays) is shown to produce maximum capacity gains. Expressions for the switching points between transmission strategies and/or antenna configurations, including mutual coupling effects, are derived and used to explore the influence of mutual coupling on the estimates. Finally, measurements taken from reconfigurable rectangular patch antenna arrays are used to validate the analytical results.

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Section: Introductionmentioning

confidence: 99%

Impact of Mutual Coupling on Adaptive Switching Between MIMO Transmission Strategies and Antenna Configurations

Bhagavatula

Heath

Forenza³

et al. 2008

Wireless Pers Commun

View full text Add to dashboard Cite

show abstract

“…Accordingly, many antennas are demanded and may be closely packed inside the devices due to limited space left for antennas. Several researches on improving antenna port isolation have been reported, including incorporating slits into the ground plane [1][2][3] or arranging the shorted portions of the antennas towards each other [4 -6]. However, these designs mainly focus on multiantennas sharing a common ground plane, and thus the decoupling between antennas is related to ground plane currents or surface waves.…”

Section: Introductionmentioning

confidence: 99%

“…Alternatively, high frequency signal can be obtained by multiplying the low frequency signal that has relatively high stability and low PN. Therefore, several studies have been done on the design of frequency multiplier circuit [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Realization of dual‐dipole‐antenna system for concurrent dual‐radio operation using polarization diversity

Chou

Liu

2009

Micro & Optical Tech Letters

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The study of the mutual coupling between the two simple strip dipole antennas is first carried out and investigated. The results show that the coupling or the antenna port isolation is almost separation distance independent when the two dipole antennas are arranged to be of orthogonal polarization. Following this characteristic, a novel dual‐dipole‐antenna system aimed for concurrent 2.4 and 5 GHz band operation and at the same time, to achieve very compact integration of two individual antennas with separate feeds is proposed. The two dipole antennas are etched on a two‐layered dielectric substrate with dimensions 30 mm × 30 mm. On the front layer is put the 2.4 GHz dipole, which is perpendicular to the 5 GHz dipole located on the bottom layer. Though the two dipoles are stacked up with a distance of 0.8 mm only, port isolation can still be below −15 dB. The proposed dual‐dipole‐antenna system is a promising candidate for the antenna solution that enables simultaneous dual‐radio operation. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1725–1729, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24421

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“…EBG (electromagnetic bandgap) periodic structures were placed in the vicinity of an antenna [12][13][14][15], which produced a band notch effect to prevent fields from penetrating through the structure to affect the antenna radiation. Cutting straight slits (or slots) on the finite ground plane in vicinity of the antenna was adopted in both [16] and [17]. Apparently current distribution on the ground plane was changed due to the slits and the reduction of mutual coupling was thus achieved.…”

Section: Introductionmentioning

confidence: 99%

“…Efforts [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] have been contributed to the reduction of mutual coupling between antennas. In [11], a smart antenna system consisted of microstrip antenna elements was presented.…”

Section: Introductionmentioning

confidence: 99%

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

Chou

Cheng

Hsu

et al. 2008

PIER

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Abstract-Various isolation improvement techniques for MIMO WLAN card bus applications consisted of three closely spaced loop antennas are presented and investigated both numerically and experimentally in this paper. The proposed techniques are easily implemented and proven effective to achieve high isolation among the antennas which is a must for MIMO terminals to receive uncorrelated signals with good system throughputs.

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A method to improve the correlation coefficient and the mutual coupling for diversity antenna

Cited by 32 publications

References 0 publications

Impact of Mutual Coupling on Adaptive Switching Between MIMO Transmission Strategies and Antenna Configurations

Impact of Mutual Coupling on Adaptive Switching Between MIMO Transmission Strategies and Antenna Configurations

Realization of dual‐dipole‐antenna system for concurrent dual‐radio operation using polarization diversity

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

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