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Isolation between antennas in a multiantenna terminal plays an important role in the performance analysis of wireless systems. When comparing different methods for increasing isolation between the antennas, it is important to note that isolation depends strongly on antenna matching. The effect of matching on isolation can be removed by numerically matching two antennas simultaneously. The resulting...
In this paper, the proposed small antenna, which using negative permittivity meta-material structure is designed, achieves wide Q more than calculated QL of chu limits. The equivalent circuit of proposed antenna is realized by Ansoft designer. The proposed small antenna is optimized by 3-D field simulation tool, CST MWS(micro wave studio).
In this paper, the miniaturization of a printed circular disc monopole antenna is investigated. It is shown that by halving the original antenna and adjusting the coplanar ground plane width, an even wider impedance bandwidth at the lower end can be obtained. Furthermore, a clear physical explanation is provided to illustrate the mechanism of this type of half circular disc antenna.
The purpose of this paper is to indicate some basic properties of the Green's functions for the DNG slab materials in comparison with normal materials. It will be shown that a closed form expression can be obtained when the DNG slab has a special constitutive parameters.
A microstrip antenna (MSA) has a number of useful properties. However, its narrow bandwidth characteristic is disadvantage in applying to practical wireless systems. Some of the conventional techniques for widening bandwidth for the MSA are using thick structures, adding parasitic patches or using electromagnetically coupled feed. In this paper, we proposed a folded inverted L-shaped probe (FILP)...
Traditional broadband antenna designs with compact radiating elements often explores the multiple resonant modes existing in the designed physical structure to obtain more bandwidth, or say to decrease the quality factor. It is well-known that antenna arrays could support multiple radiation modes. Recently, the modes in a coupled antenna system have been explored for MIMO and for beam-forming applications...
In this paper, a dual-band rejected design for cross monopole antenna is proposed and experimentally studied. To achieve wide and dual-band rejected operation, the proposed antenna consists of a UWB cross monopole antenna and the small h-shaped slots, producing dual band-rejected characteristics, maintaining wideband performance, and good omnidirectional radiation pattern. Details of the results for...
In this paper, a cavity-backed slot antenna for on-body BAN devices has been investigated. The electric field distributions inside and around the human body are numerically analyzed by the use of the FDTD method. According to the results, in the region on and near the human body, the dominant component of electric field is vertical to the body surface, and the propagation mode is assumed to be creeping...
A printed monopole antenna for quad-band operation in the mobile phone has been proposed and studied. The antenna occupies a volume of 24.3 x 20 x 4 mm3 with a very low height as compared to others, yet it can cover two wide bands centred at about 925 MHz and 1920 MHz to realize GSM/DCS/PCS/UMTS operation. Good radiation characteristics of the antenna over the operating bands have also been observed...
A proposed compact PIFA antenna with small dimension suitable for 4G handsets is presented. Overall volume of this antenna is significantly small with 0.741cm3 that makes it attractive for recent modern slim personal communication handhelds. This proposed antenna is attached with a varactor diode to archive tuning frequency property that makes antenna able to covering most popular frequency bands...
Narrow frequency bandwidth antenna is a typical shortcoming for most of the communication devices. Thus, a single radiating element which able to have resonant frequencies covering from 780MHz till 3000MHz with at least VSWR of 2.5:1 is critically needed especially for a mission critical two-way portable radio. A novel patch antenna was designed to cater for this inadequacy. Using one radiating element...
From this paper, the characteristic of the rectangular ring EBG structure has been presented. The band gap characteristic for EBG structure is depending on the gap between the elements and the different via location between elements in EBG structure. The operating frequency of this EBG structure can be used for ISM band application.
A modified small-size tapered monopole antenna is optimized for ultra wideband applications in co-design with the transceiver. Our optimization procedure aims at finding an antenna not only with low VSWR, but also miniaturizing the antenna at the same time. Our proposed optimization algorithm, real-coded compact genetic algorithm, RCCGA, has lowered the antenna area more than 48% compared to previous...
As part of an ongoing study of the electromagnetic architecture of buildings, the behaviour of frequency selective surfaces (FSS) employing only a small number of elements for indoor communications is discussed in this paper. This paper reports some results from an ongoing study of small arrays of apertures used as providers of selective transmission between two adjacent rooms within a building. The...
A novel wearable antenna for wireless communications is presented in this paper. This paper has discussed the possibility of employing a belt buckle as an antenna, bringing benefits such as removability and the ability to hand portable wireless devices from the belt itself. The antenna consists of a belt buckle, hinge, denim waist band and electrical connections. The antenna was fed by a microstrip...
In this paper, we proposed a tunable half loop antenna with two inductors and variable capacitance. To achieve the wide bandwidth required for DVB-H service, a variable capacitor is added between the transmission line and ground. In addition, the antenna gain is improved by using helical radiators. Even though the proposed antenna has very compact size of 40 mm x 5 mm x 5 mm, its gain is about 4 dB...
It is well known that a monopole antenna above a ground plane radiates an omni-directional beam around its axis. The height of this monopole can be reduced by using top-loading techniques. One such technique involves attaching a patch to the top of a monopole for use as a microwave antenna. In this case the structure is recognized as a low-profile, center-fed patch antenna. When the antenna height...
A broadband dual-polarized magneto-electric dipole with loaded dielectric substrate suitable for GSM 1800 and GSM 1900 systems have been designed and tested. Dual polarized antenna is popular in wireless communications as it employs diversity technique to combat multi-path fading for enhancing channel capacity. Two pairs of short-circuited patches are fed by four Gamma shaped probes (with the ground...
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