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The mutual coupling reduction between mm-wave dipole antennas using a corrugated surface is presented. The corrugated surface has a bandgap along the propagation direction toward the adjacent antenna. The mutual coupling is reduced between 4 to 20 dB when the corrugated surface is placed between the antennas. Moreover, the proposed corrugated surface does not have significant impact on the antenna...
A MIMO antenna with small size and ultrawideband (UWB) is proposed in this paper. The MIMO antenna has four basic antenna units that are placed vertically with each other and four embedded U-shaped metal frames. The improved isolation functions are achieved by utilizing the orthogonal polarization between each unit. It is demonstrated that this antenna can well meet the requirements of isolation and...
A dual-band coplanar waveguide (CPW) fed folded printed pseudo-monopole antenna (PPMA) of T-shape having 5.4% bandwidth (BW) at 1.5 GHz and 54% BW in the 3.5 GHz bands is proposed for LTE/WLAN/WiMAX. Not only the T-shaped PPMA is more compact than the standard PPMA, but also the capacitive loading, caused by the folding of the strip, is shown to improve the impedance matching, where two resonances...
This paper proposes a simple formulation for computing the full cross-covariance of multi-user multi-antenna multipath propagation channels where the multipath characteristics observed at two adjacent radios are correlated. The technique is applied to the case of key establishment based on reciprocal electromagnetic propagation to demonstrate the impact of a proximate eavesdropper on the key rate...
A 4-element dual-band Circular Yagi based multiple-input-multiple-output (MIMO) antenna system with loop excitation is presented. It has a very wide-bandwidth of 1 GHz in both bands. The lower band covers from 1.45–2.55 GHz while the upper band covers from 3.707–4.71 GHz. This antenna is highly directional with front-to-back ratio (FBR) of 13.8 dB, gain of 6.6 dB and directivity of 7 dB. The proposed...
We describe a novel two-port MIMO antenna that is intended for use in wireless capsule endoscope systems. The purpose of the MIMO antenna is to enable increases in data transmission rates, compared to existing single antenna systems, to support the transmission of high resolution images from the capsule. The proposed MIMO antenna consists of a small magnetic loop antenna with horizontal polarization...
In this paper, a dual-band CPW-fed MIMO antenna is designed and analyzed. Fundamental resonance of the coplanar stepped impedance resonator (CSIR) produces the 1st operating band, while its harmonic resonance and the resonance of the rectangular slot line resonator (RSLR) construct the 2nd band. The port-to-port isolation within the 2nd band is high since it works at the harmonic resonant frequency...
The triple band MIMO antenna composed of two unbalanced fed ultra low profile inverted L antennas with parasitic elements on the rectangular conducting plane is proposed for WiMAX applications of 2.3 GHz to 2.7 GHz, 3.3GHz to 3.8 GHz, and 5.25 GHz to 5.85 GHz. The inverted L parasitic element is located between the inverted L antenna and ground plane. In addition, the rectangular parasitic element...
In this letter, a dual-band differential CPW-fed MIMO antenna for Worldwide Interoperability for Microwave Access (WiMAX) application is proposed. The antenna has a square ring ground and a common patch which is shared by two pairs of differentially-fed ports. By arranging two pairs of differential ports orthogonally in the virtual ac ground of each other, the differential isolation can be infinite...
Wideband collocated antennas for multiple input multiple output (MIMO) systems are presented. The structure is disposed on a single substrate layer and is composed of a disc monopole and a tapered slot antenna in a form of a Vivaldi one, both operating in the band 2.15–3.76 GHz. The two elements exhibit a low mutual coupling since it is around −17 dB over the considered bandwidth. This performance...
A novel design of four-port MIMO antenna with backed co-located dual cavities is presented. The proposed MIMO antenna can operate in dual band and dual polarization for WLAN applications. By means of the backed co-located dual cavities, the proposed antenna can generate unidirectional radiation patterns in the 2.4GHz and 5.5GHz bands. Using two orthogonal feedings, the antenna can achieve dual polarized...
The implementation of a four sectorial reconfigurable MIMO antenna system is discussed in this paper. The proposed antenna system consists of two MIMO structures that operate at two different frequencies. The reconfigurability of the antenna system is software controlled through an arduino board and a mobile phone application. A prototype is fabricated and tested as a proof of concept.
This paper presents a 6-element 28/38 GHz dualband multiple-input multiple-output (MIMO) printed inverted F-antenna (PIFA) for the future millimeter-wave (mm-Wave) fifth generation (5G) cellular communication systems. The MIMO antenna system consists of six dual-band PIFA antenna elements in a certain arrangement. This arrangement has been chosen based on an extensive study to select the best one...
In this paper, a hybrid analog-digital beamforming technique for downlink massive multiple input multiple output (MIMO) system is studied. The performances of fully analog beamforming, fully digital beamforming, and hybrid beamforming are to be examined when applying both uniform and non-uniform linear arrays. For this system, first perfect channel estimation is assumed at the base station and the...
A design of a compact multiple-input multiple-output (MIMO) antenna with a small size of 36 × 72 mm2 for multiband applications is introduced. The presented MIMO antenna includes of two similar antenna elements. Each element has a planar radiator with microstrip-feed and an asymmetrical truncated rectangular ground plane. The designed triple-band antenna is formed by employing meander line stubs with...
This paper discusses over-the-air (OTA) testing for multiple-input–multiple-output (MIMO) capable terminals with emphasis on wideband MIMO channel capacity analysis in a multiprobe anechoic chamber setup. In the literature, the spatial correlation simulation accuracy at the receiver (Rx) side has been used to determine the test area size for a limited number of probes. However, it is desirable that...
Over-the horizon wireless communications within the HF-band is subject to the Faraday effect where the polarization of electromagnetic waves rotates due to the ionization and geomagnetic interactions. This results in further signal loss and fading in addition to the usual multi path propagation fading. In this work, based on the standard Watterson HF channel model, a new HF-MIMO fading channel model...
Understanding the impact of interference upon the performance of a multiple input multiple output (MIMO) based device is of paramount importance in ensuring a design is both resilient and robust. In this work the effect of element-element interference in the creation of multiple channels of a wireless link approaching the near-field regime is studied. The elements of the 2-antenna transmit- and receive-arrays...
In this paper, a four port disk shaped compact multiple input multiple output (MIMO) patch antenna for vehicular application is proposed and fabricated. The structure is composed of a circle patch with cross slot combined to an annular ring patch. The structure is analyzed by using Theory of Characteristic Modes (TCM). The inner and outer part of the antenna operated at its TM11 and TM21 modes respectively...
This paper presents a simple tunable decoupling mechanism for a tri-band coupled monopole antenna working in LTE700/GSM850/900 bands for MIMO application. A parasitic scatterer with two distributed MEMS tunable capacitors is utilized to match the impedance and mitigate the effects of mutual coupling between elements. Thus, the antenna performance is enhanced significantly by minimizing the coupling...
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