Current Issue : October - December Volume : 2017 Issue Number : 4 Articles : 6 Articles
This paper proposes a microstrip patch antenna based on the left-handed metamaterial concept, using planar periodic geometry,\nwhich results in improved characteristics. This periodic geometry is derived from fractal shapes, which have been widely used in\nantenna engineering. The metamaterial property was obtained as a result of the double-fractal structure on both the upper and\nthe bottom sides of the antenna. The final structure has been optimized to enhance bandwidth, gain, and radiation characteristics\nof the microstrip antenna. This combination significantly improved antenna performance; our design could support an ultrawide\nbandwidth ranging from 4.1 to 19.4GHz, demonstrating higher gain with an average value of 6 dBi over the frequency range and a\npeak of 10.9 dBi and a radiation capability directed in the horizontal plane of the antenna....
A novel design of 1 Ã?â?? 2 and 2 Ã?â?? 2 circularly polarized (CP) microstrip patch antenna arrays is presented in this paper. The two CP\nantenna arrays are fed by sequentially rotated coplanar waveguide (CPW) to slotline networks and are processed on 1mm thick\nsingle-layer FR4 substrates. Both of the two arrays are low-profile and lightweight. An air-bridge free CPW-slotline power splitter is\nappropriately designed to formthe feeding networks and realize the two CP antenna arrays.Themechanism of circular polarization\nin this design is explained. The simulated and measured impedance bandwidths as well as the 3 dB axial ratio bandwidths and the\nradiation patterns of the two proposed antenna arrays are presented.This proposed design can be easily extended to form a larger\nplane array with good performance owing to its simple structure....
Thedesign and fabrication of a coupler with three reconfigurable output ports have been proposed.The output ports of the proposed\ncoupler can be adjusted by varying the number of shorting pins. An antenna with a reconfigurable beamwidth has been also involved\nin this paper. The proposed antenna has a coupler and a 1 Ã?â?? 3 array rectangular patch.The beamwidth is set by the number of output\nports.The simulation and experiment show the verification of the proposed coupler and beamwidth variation of array antenna.The\nbroadest measured beamwidth was 66.2âË?Ë? and the sharpest measured beamwidth was 24.1âË?Ë?....
This work reports on an efficient design methodology for realizing hybrid filter-antenna subsystems. Designing a filter-antenna\nsubsystem in the case of complex multimode filter is not straightforward. The coupling of the antenna with a multimode filter\ndepends upon several uncorrelated parameters. An efficient design methodology is proposed which can address these complex\nproblems. The work focuses on the characterization of radiating and filtering elements and then proposes a reliable model, which\nis derived mathematically as well as from rigorous statistical analyses, which can then be used for designing hybrid filter-antenna\nstructures such as a hybrid DRA codesigned with a SIW based multimode filter. A highly compact filter-antenna subsystem has\nbeen designed employing the proposed methodology, and the measured results validate the proposed design technique....
This paper presents a hybrid ring feeding dual-polarized patch antenna with high isolation in a wide working band. The proposed\nantenna consists of a circular radiating patch printed on the upper horizontal substrate, two pairs of Ã?â?? shaped strips printed on\ntwo vertical substrates, and a hybrid ring feeding network printed on the lower two horizontal substrates. The proposed antenna\nadopts Ã?â?? shape strips coupled feeding structure to achieve a wide operating band. Furthermore, a hybrid ring feeding structure\nwith high isolation in a wide bandwidth, which is firstly proposed, is applied as feeding network. When one port is excited, the\nfeeding network can realize twice the power cancellation.Thus, high ports isolation characteristics can be obtained. A prototype\nof the proposed antenna is fabricated and measured. Measured results show that the 10 dB reflection coefficient bandwidths of the\ntwo ports are both about 38.7%, with port isolation higher than 40 dB through most of the band, and the cross-polarizations are\nbelow âË?â??24 dB....
This paper presents system modeling of three different single band antennas using the singularity expansion method (SEM). To\nacquire the accurate physical complex poles and the corresponding residues of the narrow band antenna model, an enhanced\nMatrix Pencil (MP) method has been applied to the impulse response of the antennas. A delayed time parameter ...
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