A narrow band antenna of dimensions 0.54Â¿Ã0.28Â¿Ã0.09Â¿ is presented. The design is suited for use in cellular radio-over-fibre networks. Associated mobile equipment using the international unlicensed WiMAX band (5.470-5.725 GHz) is also described. The antenna is well matched across the band and is suitable for a full-duplex bi-directional system with simultaneous transmission ( Tx ) and reception ( Rx ). It can be used with mobile handsets offering WiMAX connections, and in multi-sector configurations for vehicular communication systems.
"It can be either housed in the shark fin multiantenna system or placed inside the vehicle for in-car communications . The antennas presented in  and  are not suitable for in-car communications, since they operate only for a portion of the UWB band. 4) The proposed UWB antenna offers good impedance match over a large frequency range (VSWR ≤ 1.4 from 3.2 to 9 GHz) unlike , , , and , which is one of the key requirement for vehicular antennas. "
[Show abstract][Hide abstract] ABSTRACT: This communication presents a bandwidth enhanced, compact, monopole loop antenna with modified ground plane for modern automotive ultra wide -band (UWB) applications. The proposed loop antenna has hybrid geometry and is constructed using half circular ring and half square ring.The ground plane of the fundamental radiator is curved and defected to improve the VSWR bandwidth. An extended ground stub is added to further enhance the bandwidth to suit the modern automotive requirements. The designed antenna covers 3.1– 10.9 GHz frequency spectrum with VSWR ≤ 2. This antenna can be conveniently placed inside the shark fin housing on the vehicle’s roof or it can be printed along with the existing Print Circuit Board (PCB) electronics nullifying the need for dedicated location on vehicle’s body for in-car communications. Further, a simple 2 port Multiple Input Multiple Output (MIMO) antenna is constructed and its diversity performance is estimated. The prototype is fabricated and tested for impedanceand radiation characteristics.
IEEE Transactions on Antennas and Propagation 06/2015; 63(9). DOI:10.1109/TAP.2015.2447006 · 2.18 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Among the different assets tracking solutions radiofrequency IDentification (RFID) is a promising technology for in-car communications because of its relatively low-cost deployment and real-time monitoring and processes. In this study, a hidden, miniature, narrow-band antenna of dimensions 0.18λ × 0.20λ × 0.005λ is presented, which is easy to manufacture using conductive paint sprayed over a car body. The design relies on a resonator, a negative image of the radiator for improved efficiency when in close proximity to ground planes and is suited for use in RFID networks using the unlicensed RFID band (865.6-867.6 MHz) described. The term miniature comes from the fact that the antenna is physically small given low proximity and insensitivity to the ground plane, which facilitates a possible coating layer over the antenna for hidden applications.
[Show abstract][Hide abstract] ABSTRACT: We present an approach to design from scratch planar microwave antennas for the purpose of ultra-wideband (UWB) near-field sensing. Up to about 120 000 design variables associated with square grids on planar substrates are subject to design, and a numerical optimization algorithm decides, after around 200 iterations, for each edge in the grid whether it should consist of metal or a dielectric. The antenna layouts produced with this approach show UWB impedance matching properties and near-field coupling coefficients that are flat over a much wider frequency range than a standard UWB antenna. The properties of the optimized antennas are successfully cross-verified with a commercial software and, for one of the designs, also validated experimentally. We demonstrate that an antenna optimized in this way shows a high sensitivity when used for near-field detection of a phantom with dielectric properties representative of muscle tissue.
IEEE Transactions on Antennas and Propagation 09/2015; 63(9):4208-4213. DOI:10.1109/TAP.2015.2449894 · 2.18 Impact Factor
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