Low Correlation Mimo Antennas With Negative Group Delay

Chung, Jae‐Young; Yang, Tianhe; Lee, Juhyung

doi:10.2528/pierc11051007

Cited by 22 publications

(21 citation statements)

References 23 publications

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“…If the h has frequency ans, then he filter [3]. The d if we know the Commonly group or it specifies the oup of sinusoidal narrow frequency odel n components with med to be Rayleigh The signal to noise r is given as … (8) ... (9) filter is calculated 0) from … (11) ng with Doppler se varying ON tical model of the ter coefficients are compare the result for two frequency ranges, one one is 910 to 914 MHz. We take the coefficients l x2=0.1191-.0670i, x3= After calculating the coeffic determined.…”

Section: Results and Discussiomentioning

confidence: 99%

Analytical model of cooperative MIMO channel under severe fading

Bora

Sarma

2015

2015 2nd International Conference on Signal Processing and Integrated Networks (SPIN)

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The Cooperative Multiple Input Multiple Output (CMIMO) is an important segment of 4G communications. The working of a Multiple Input Multiple Output (MIMO) set-up in a cooperative manner becomes crucial primarily due to the delays involved among different nodes of the network. Hence minimization of delay is one of the primary concerns of CMIMO. This paper presents an analytical model of CMIMO to calculate the group delay and phase delay between nodes in real time for a severely faded non-linear non-line-of-sight (NLOS) propagation environment. This model can effectively be used for designing a CMIMO network with reduced delay. The theoretical basis of delay analysis proves the simplicity and accuracy of the proposed technique.

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Section: Results and Discussiomentioning

confidence: 99%

Analytical model of cooperative MIMO channel under severe fading

Bora

Sarma

2015

2015 2nd International Conference on Signal Processing and Integrated Networks (SPIN)

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“…A correlation reduction technique with a negative group delay using slots was proposed for compact MIMO systems in [14]. When two linearly polarized antennas are located orthogonally to each other, they can reduce the mutual coupling and provide polarization diversity [15,16].…”

Section: Introductionmentioning

confidence: 99%

A Broadband Technique for a Decoupling Network in a Compact Antenna Array in a Mimo System

Ko¹,

Han²,

Myung³

2014

PIER C

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Abstract-Decoupling networks (DNs) have frequently been used to obtain high isolation performance between coupled antennas in multiple-input multiple-output (MIMO) systems due to their advantage of spatial efficiency, which is particularly important for mobile devices. However, conventional DNs suffer from narrowband limitations. In this paper, a broadband decoupling technique is proposed that broadens the isolation bandwidth using a parallel resonant point. A 1.95 GHz MIMO antenna system with 460 MHz of bandwidth (fractional bandwidth, FBW = 23.6%) is designed and measured using the scattering parameters. The isolation is found to be better than −15 dB, while the reflection coefficient is better than −6 dB. Furthermore, the antenna efficiency and envelope correlation coefficient (ECC) are evaluated in a reverberation chamber.

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“…Hence, the planetary signal caused by the planetary caustic has not been understood as a single-lensing light curve. Recently, Chung & Lee (2011) studied the perturbation pattern of the planetary caustics in the separation range of 1 R E <s<3 R E , which focused on the properties related to the strength of the perturbation depending only on the star-planet separation but did not deal with in detail with the change of the perturbation according to the finitesource effect.…”

Section: Introductionmentioning

confidence: 99%

Properties and Detection Limits of Planetary Caustic Perturbation Induced by a Wide-Separation Planet

Ryu

Chung

Lee

et al. 2016

ApJ

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Microlensing experiments are entering a next generation of survey types to monitor a wide field of view continuously with a frequent sampling. The theoretically predicted sensitivity of a planet detection on the lensing parameters can be used for the establishment of observational strategies for maximal planet detections. Hence, we investigate the detection condition of planetary signals caused by the planetary caustic. We calculate the deviation area induced by the planetary caustic for various lensing parameters and find that the deviation area generally increases according to the increase of the source radius. However, after the normalized source radius approaches a certain value the deviation area rapidly decreases and disappears at the same normalized source radius, regardless of the mass ratio and the separation between the planet and its host star. We find a simple relation between the normalized source radius and the deviation threshold for the largest and smallest deviation areas. From this relation we also find an analytic condition for the detection limit of the planetary signal as the function of the source radius and the deviation threshold. In addition, we compare the deviation areas and the light curves between the planetary caustic perturbation and a free-floating planet. We find that the planetary caustic perturbation can be approximated by the single-lensing light curve of the planet itself perturbed by the planetary caustic. Finally, we can expect to find a low-mass planet with the Earth's mass or even that of the Earthʼs moon from the detection condition and conclude that our findings may help for maximal planet detections considering the source type and the photometric accuracy.

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Low Correlation Mimo Antennas With Negative Group Delay

Cited by 22 publications

References 23 publications

Analytical model of cooperative MIMO channel under severe fading

Analytical model of cooperative MIMO channel under severe fading

A Broadband Technique for a Decoupling Network in a Compact Antenna Array in a Mimo System

Properties and Detection Limits of Planetary Caustic Perturbation Induced by a Wide-Separation Planet

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