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In this paper, a 6 × 6 planar slot array based on a hollow substrate integrated waveguide (HSIW) is presented. To eliminate the tilting of the main beam, the slot array is fed from the centre at the back of the HSIW, which results in a blockage area. To reduce the impact on sidelobe levels, a slot extrusion technique is introduced. A simplified multiway power divider is demonstrated to feed the array...
Substrate integrated waveguide (SIW) technology is combined with the classical theory of log-periodic antennas to realize SIW slot antennas with broadband performance. Based on the orientation of the slots, two variations are compared - the transverse slot antenna and longitudinal slot antenna. Both techniques achieve much wider impedance bandwidth than a traditional uniform slotted waveguide antenna...
This paper presents a new method to improve isolation between two loop antennas with absorber cells exhibiting negative permittivity and permeability at the aimed frequency of 2.45 GHz. The metamaterial (MTM) unit cell was constructed by two open complimentary split ring resonator (OCSRR) and a split ring resonator (SRR) arrangement. The proposed antenna structures were composed of two loop antennas...
In this paper, a multiple-input-multiple-output (MIMO) for dual frequency band is proposed. Each antenna consists of two folded planar inverted F structure with slits and split ring resonator (SRR) cells on a ground plane. It is designed on a FR-4 substrate (relative permittivity = 4.4, height = 0.8 mm) using micro-strip technology. The size of the ground plane and each chip type planar inverted F...
In this paper a co-planar waveguide (CPW)-fed zeroth-order resonant (ZOR) antenna with an improved gain and radiation efficiency was built and tested. The unit cell of the proposed antenna consists of a series metal-insulator-metal (MIM) capacitor and two shorted shunt stub inductors. In order to reduce the antenna size and to exhibit achieve excellent efficiency a straight strip bent by 90 degree...
In a microstrip patch antenna design on the finite size of ground plane, it shows significant performance degradation by surface waves. It is well known that the smaller ground plane size, the gain is decreased and the back lobe is increased. As the size of the ground plane is reduced, currents distribution of the ground plane edge is increased. These currents results in diffraction of both leaky...
In this paper, a single-feed switchable feed network that combines two port of a micro-strip antenna with a quarter wavelength feed-line, is presented. The principle operation of a switchable feed network is based on the assumption that a quarter wavelength feed-line is terminated with a micro-strip antenna. The proposed switchable feed network can be designed with a multiple odd numbers of a quarter...
In this paper, a wearable antenna for wireless local area network (WLAN: IEEE 802. 11a, n −5.725 GHz ~ 5.825 GHz) band applications using a stacked square ring patch element is proposed. It consists of a micro strip line with indirect feeding method and a stacked square ring patch. It is designed on a flexible printed circuit board (PCB). The proposed antenna shows good characteristics such as a WLAN...
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