Diversity and MIMO performance evaluation of compact multi element antennas with common phase center

Papamichael, V.; Karaboikis, M.; Soras, C.; Makios, V.

doi:10.1109/icecom.2007.4544418

Cited by 7 publications

(15 citation statements)

References 13 publications

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“…If single polarization is considered, (13) will have similar form with the covariance matrix formula of [7], when conditioned on (1) with 1 c to be defined as in (6). The covariance matrix in (13) …”

Section: B Proposed Methodologymentioning

confidence: 99%

“…The covariance matrix has been determined using the mean effective gain and correlation coefficient of the antenna elements [2], [6], or using the non-rigorous formula [7, eq. (25)] having an undefined mathematical constant and a quantity that ambiguously incorporates antenna radiation characteristics.…”

Section: Covariance Matrix Methodologymentioning

confidence: 99%

“…The DAG is determined in terms of SNR enhancement at a specific outage probability (OP) 1 u (DAG-OP) and in terms of average SNR reduction for achieving a specific average bit error rate (BER) 2 u (DAG-BER) [6]. In order to find both DAGs, the PDF and CDF of received SNR are needed.…”

Section: Dag-op and Dag-ber Under Tas/mrcmentioning

confidence: 99%

“…Comparing (1) and (4) c depends on the spatial direction that the sums in (6) are maximized and its determination requires numerical techniques. No analytical generic solution can thus be found, as it will rely on the specific MPA setting and application of suitable numerical techniques.…”

Section: A the Covariance Matrix Formula [7 Eq (25)]mentioning

confidence: 99%

“…In previous approaches, the respective parameters for determining the covariance matrix (i.e., the mean effective gain and correlation coefficient) were affected by the termination conditions, e.g., [2], [6]. The covariance matrix formula in [7] was derived without rigorously applying the reciprocity principle of MPA systems.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

On the Covariance Matrix and Diversity Performance Evaluation of Compact Multiport Antenna Systems

Papamichael¹,

Karadimas

2017

IEEE Trans. Antennas Propagat.

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Abstract-In this paper, we present a new electromagnetic methodology that determines the covariance matrix of compact multi-port antenna (MPA) systems at the early design stage. Further insight to this field is provided, as contrary to existing methodologies, it rigorously relies on the reciprocity principle of MPA systems. Thus, the impact of propagation environment, termination conditions and MPA radiation characteristics as independent factors affecting performance is physically incorporated. Provided the availability of mathematical expressions for the cumulative distribution function (CDF) and probability density function (PDF) of received signal-to-noise ratio (SNR), performance can be then analytically studied via the diversity antenna gain (DAG) in terms of a) SNR enhancement at a specific outage probability (OP) level (that is DAG-OP) and b) average SNR reduction for achieving a specific average bit error rate (BER) (that is DAG-BER). Illustrative examples with performance evaluation of compact MPA systems are presented. The adopted diversity technique is the transmit antenna selection/maximal ratio combining (TAS/MRC), which for the first time is analytically studied employing realistic MPA systems. Comparisons with existing published results further demonstrate the validity and usefulness of the proposed methodology.Index Terms-Antenna diversity, Covariance matrix methodology, Diversity antenna gain, Multi-port antenna systems.

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Section: B Proposed Methodologymentioning

confidence: 99%

Section: Covariance Matrix Methodologymentioning

confidence: 99%

Section: Dag-op and Dag-ber Under Tas/mrcmentioning

confidence: 99%

Section: A the Covariance Matrix Formula [7 Eq (25)]mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the Covariance Matrix and Diversity Performance Evaluation of Compact Multiport Antenna Systems

Papamichael¹,

Karadimas

2017

IEEE Trans. Antennas Propagat.

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Low-cost thin film patch antennas and antenna arrays with various background wall materials for indoor wireless communications

Kerminen

Xie

Mela

et al. 2023

Flex. Print. Electron.

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The present study introduces an inkjet-printed flexible coplanar waveguide (CPW) patch antenna array concept. Single antenna and four-element antenna arrays were characterized, which were attached to a sub-miniature version A (SMA) connector via an innovative solderless, 3-D printed "plug and play type" tightener. Furthermore, indoor wireless communication and internet of things (IoT) scenarios with commonly used wall materials including gypsum and plywood board, on which the patch antennas and antenna arrays can be attached, were also presented. In order to validate the concept, design and fabrication iterations in parallel with numerical and experimental investigations were executed. To elaborate, single antenna and antenna array configurations without and with wall materials were characterized to see their functionality at 2.4 GHz resonance frequency with beyond 300 MHz bandwidth, respectively. The results demonstrated that the investigated configurations fulfill the short-range radio transmission and can be utilized, e.g. for indoor backscattering type communications and wireless sensing applications, as an affordable and versatile alternative for their conventional counterparts. Being attached to their corresponding background materials, single antenna specimens were measured to have return losses beyond 18 dB and peak gains around 1 dBi while higher peak gains above 6 dBi were detected for antenna arrays.Moreover, the antenna arrays can enable multiple-input and multiple-output (MIMO) communication. The proposed arrays had diversity performance in terms of return losses higher than 15 dB, isolation more than 20 dB, envelope correlation coefficient (ECC < 0.001), diversity gain (DG > 9.95 dB), mean effective gain (MEG < -3 dB), power ratio factor (k < 0.5 dB), and channel capacity loss (CCL < 0.4 bits/s/Hz).

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Study on Mutual Coupling Reduction Technique for MIMO Antennas

2019

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In recent years, multiple-input-multiple-output (MIMO) antennas with the ability to radiate waves in more than one pattern and polarization play a great role in modern telecommunication systems. This paper provides a theoretical review of different mutual coupling reduction techniques in MIMO antenna systems. The increase in the mutual coupling can affect the antenna characteristics drastically and therefore degrades the performance of the MIMO systems. It is possible to improve the performance partially by calibrating the mutual coupling in the digital domain. However, the simple and effective approach is to use the techniques, such as defected ground structure, parasitic or slot element, complementary split ring resonator, and decoupling networks which can overcome the mutual coupling effects by means of physical implementation. An extensive discussion on the basis of different mutual coupling reduction techniques, their examples, and comparative study is still rare in the literature. Therefore, in this paper, different MIMO antenna design techniques and all of their mutual coupling reduction techniques through various structures and mechanisms are presented with multiple examples and characteristics comparison.

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Diversity and MIMO performance evaluation of compact multi element antennas with common phase center

Cited by 7 publications

References 13 publications

On the Covariance Matrix and Diversity Performance Evaluation of Compact Multiport Antenna Systems

On the Covariance Matrix and Diversity Performance Evaluation of Compact Multiport Antenna Systems

Low-cost thin film patch antennas and antenna arrays with various background wall materials for indoor wireless communications

Study on Mutual Coupling Reduction Technique for MIMO Antennas

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