Current Issue : October - December Volume : 2018 Issue Number : 4 Articles : 7 Articles
A series-fed linear substrate-integrated dielectric resonator antenna array (SIDRAA) is presented for millimeter-wave applications,\nin which the substrate-integrated dielectric resonator antenna (SIDRA) elements and the feeding structure can be codesigned and\nfabricated using the same planar process. A prototype 4 Ã?â?? 1 SIDRAA is designed at Ka-band and fabricated with a two-layer printed\ncircuit board (PCB) technology. Four SIDRAs are implemented in the Rogers RT6010 substrate using the perforation technique\nand fed by a compact substrate-integrated waveguide (SIW) through four longitudinal coupling slots within the Rogers RT5880\nsubstrate. The return loss, radiation patterns, and antenna gain were experimentally studied, and good agreement between the\nmeasured and simulated results is observed. The SIDRAA example provides a bandwidth of about 10% around 34.5 GHz for\n10 dB return loss and stable broadside radiation patterns with the peak gain of 10.5ââ?¬â??11.5 dBi across the band....
When designing printed wide-slot antennas, the shape or profile of the tuning stub is a key geometric structure that affects the\nimpedance bandwidth of the antenna. This article introduces a new process for designing tuning stub shapes, which are the\nblended results of a diamond and a circle. By using different geometry shapes, the design could generate a series of bandwidths\nwith a regular trend. Detailed investigations and analysis were conducted on some key geometry parameters to explore their\nimpact on the impedance bandwidth of the antenna. To certify the new design method, several prototypes were simulated,\ndeveloped, and measured. The experimental and simulated results showed good agreement with each other. The results indicate\nthat by properly selecting various blended shapes, a BW range from 80.1 to 117.3% for a VSWR of less than 2 could be\nobtained, which provides a convenient model for a wideband antenna design....
Communication between moving vehicles is very important for safety. In this paper, a bidirectional antenna that can be installed\ninside a vehicle is proposed and tested in a real vehicular environment at 5.8 GHz. The forward link and backward link seated by\ntwo persons and three persons were compared in terms of received RF power and the peak-to-average power ratio (PAR). It was\nfound that, even with three persons, the power link fulfilled the communication requirements using the proposed antenna....
A compact high isolation ultrawideband (UWB) multiple-input-multiple-output (MIMO) antenna is designed. The proposed\nMIMO antenna consists of a rectangular monopole antenna and a slot antenna fed by two microstrip lines, respectively. To\nimprove the impedance matching, a circular coupling structure is designed to feed the tapered slot antenna. The parasitic\nresonance introduced by the ground stub helps to extend the impedance bandwidth of monopole antenna at the upper UWB\nband. Commonly used complex decoupling or coupling structures are eliminated that endow the proposed antenna minimized\nfoot print, which is preferred in mobile handset. Although without decoupling structure, high isolation is obtained between two\nantenna elements. Simulation and measurement verify the antennaââ?¬â?¢s desirable performance, showing a broad impedance\nbandwidth of 3.1ââ?¬â??10.6 GHz with |S11| < âË?â??10 dB and |S21| < âË?â??20 dB over 3.4ââ?¬â??10.6 GHz, and |S21| < âË?â??18 dB from 3.1ââ?¬â??3.4 GHz....
Currently, communication system requires multiband small antennas for 5G\nmobile applications. Driven this motivation, this paper proposes a multiband\npatch antenna for Wi-Fi, WiMAX and 5G applications. The proposed antenna\ncan effectively operate at 2.4 GHz as Wi-Fi, 7.8 GHz as WiMAX and 33.5 GHz\nas 5G communication purposes. The proposed antenna arrays have given directional\nradiation patterns, very small voltage standing wave ratio, high gain\n(VSWR) and directivity for each aforementioned systems operating frequency.\nThis antenna is made for multiband purpose which can be effective for not\nonly Wi-Fi and WiMAX but also 5G applications....
This paper proposes a dual-band reconfigurable square-ring antenna with a polarization diversity property. The proposed antenna\nconsists of a square-ring resonator, two stubs with a shorting via, and two PIN diodes. The stub is positioned symmetrically to the\nleft and right of the square-ring resonator, and the square-ring antenna connected to one of two stubs has a dual-band resonance. In\nthis case, both resonant frequencies exhibit linear polarization (LP), and the two polarized waves are perpendicular to each other.\nThe PIN diode selectively connects only one of the two stubs to the square-ring resonator. Thus, the polarization of the proposed\nantenna changes electrically at the two resonant frequencies. In addition, the frequency ratio (f2/f1) can be easily controlled by\nchanging the length or width of the stub....
This paper considers a Multiple-Input Multiple-Output (MIMO) system with P transmitting\nand R receiving antennas and different overall noise characteristics on the different receiver antennas\n(e.g., due to nonlinear effects at the receiver side). Each communication link employs a Single-Carrier\nwith Frequency-Domain Equalization (SC-FDE) modulation scheme, and the receiver is based on\nrobust iterative frequency-domain multi-user detectors based on the Iterative Block Decision Feedback\nEqualization (IB-DFE) concept. We present low complexity efficient receivers that can employ low\nresolution Analog-to-Digital Converters (ADCs) and require the inversion of matrices with reduced\ndimension when the number of receive antennas is larger than the number of independent data\nstreams. The advantages of the proposed techniques are particularly high for highly unbalanced\nMIMO systems, such as in the uplink of Base Station (BS) cooperation systems that aim for\nSingle-Frequency Network (SFN) operation or massive MIMO systems with much more antennas at\nthe receiver side....
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