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A L-shaped defective ground structure (i.e. DGS) is implemented in the ground surface and length of the DGS is revised accordingly to achieve the lower application frequency bands viz. GSM band, Bluetooth band and WiMax band respectively. As a consequence, frequency tunable characteristics with optimal bandwidth and gain is observed in the application frequency bands for proposed antenna.
This paper presents a systematic design of microstrip decoupling network to reduce the mutual coupling effect between a two-element antenna array. This design is based on the eigen-mode analysis method. The achieved microstrip decoupling network is simple and easy to fabricate. A reduction of more than 20 dB in mutual coupling is obtained for a two-element monopole array with element spacing of 0...
In this paper triangular microstrip antenna with a novel defective ground structure are proposed. Without the defective ground structure (DGS) the structures are found to be resonant at 5.2 GHz. When the DGS are introduced a frequency shift of 5.2 GHz to 1.8 GHz is observed. The main essence of this paper is the miniaturization of the antenna.
Tilting of broadside radiation pattern of microstrip antenna array is obtained by loading SRR on the ground plane between antenna elements. Progressive Phase Shift method is used here. The phase delay generated by single SRR is around 500 when compared to a reference transmission line. The beam scanning is found to be 280 with central frequency of 10 GHz and gain of 11.18 dB.
A compact planar antenna for Low frequency mobile communication is presented. The antenna requires very small portion, i.e.; 45∗32mm2 of system circuit board for its placement over No-Ground portion. And ground-plane requires area of 45∗90mm2. Basically, we initiated from designing a meander monopole antenna. Afterwards impedance-adjustment structure is added, the resulting antenna can be viewed as...
A metasurface (MTS) antenna is proposed for low-profile and wideband operation based on characteristic mode analysis (CMA). An MTS radiator formed by a diamond-slotted patch is fed by a microstrip line at its bottom through a slot centered on a ground plane. The CMA is used for the modeling, analysis, and optimization of the proposed antenna in order to reveal the underlying modal behaviors of the...
A new ultra-wideband planar microstrip antenna obtained by combining rectangular and circular shaped planar monopole patches is proposed. The optimum feed-line position is obtained individually for rectangular and circular patches by studying their surface current distributions. The rectangular and circular geometries are then merged to obtain a modified configuration. A parametric study for varying...
In circularly polarized radiation, the rotational orientations of the transmitter and the receiver antennas are unimportant in relation to the received signal strength. In this paper, a center square slot cut elliptical patch microstrip antenna to realize a tunable circular polarization in 1000 MHz frequency band is proposed. It yields axial ratio bandwidth of nearly 1.2% over tunable range. A rectangular...
A broadband aperture-coupled stacked patch array with a 45° polarization is presented. With the stacked patches and air layer structure being used, the elements' bandwidth and radiation efficiency are improved. The array achieves the 45°-polarization radiation through rotating the patches of each element. Experimental results show that a sound impedance match and stable radiation patterns are achieved...
In this paper, the design of aperture-couplet rectangular dielectric resonator antennas arrays is illustrated. The effect of slot feed on the dielectric resonator antenna (DRA) and the effect of the spacing between array elements is observed. This paperwork can be useful for WLAN applications with the operating frequency 5.8 GHz.
Analysis and design of multi-band dual polarized circular microstrip antenna with an angular cut and pair of rectangular slot in 1000 MHz frequency range is proposed. The angular cut degenerates TMjj and TM21 resonant modes of equivalent circular patch into two orthogonal modes to yield multi-band response. Further pair of rectangular slots optimizes the input impedance at degenerated resonant modes...
A space-fed array fed by a proximity fed microstrip antenna for a broader bandwidth is proposed. The 1 × 3, 3 × 1, plus-shaped and 3 × 3 configurations are studied. A parametric study for varying distances between the fed-patch and the array is done and the optimum results for each configuration have been presented. A bandwidth of 1.1 GHz and a gain of 14.6 dBi is obtained in 3 × 3 space fed configuration.
In this paper a single fed elliptical microstrip antenna to realize circular polarization in 1000 MHz frequency band is proposed. It yields axial ratio bandwidth of 10 MHz (∼1.2%). A sequentially rotated gap coupled configuration with a single parasitic patch along x axis is studied. Thereafter, gap coupled array along x and along y axis, i.e., a plus shaped array is studied to increase the ARBW....
This paper presents the design of a compact size Sierpinski carpet fractal antenna, operating in C-band with two resonant frequencies of TV satellite system, namely (3.625 – 4.2) GHz, and (5.85 – 6,425) GHz. Antenna is designed on FR4 microwave laminate, with return loss S11<−18 dB. Bandwidth of antenna is BW> 80 MHz, for VSWR<2, at 50 ohm input impedance. To achieve compact size, despite...
This paper proposes a novel Multi-band dual polarized elliptical shaped microstrip antenna cut with square and rectangular slot. The square slot in elliptical patch degenerates patch TM11 and TM21 modes into two orthogonal modes to realize multi-band characteristics. The optimization of the input impedance at degenerated resonant modes is done by the introduction of the rectangular slot to realize...
Series-fed array of square patches designed at 10 GHz, with three different configurations has been analyzed for sidelobe level and cross-polarization characteristics. A series-fed 8×2 planar array is analyzed to provide a sidelobe level of − 24.2dB and cross-polarization level of −21.8dB. The second configuration; a 2-line series array of 8 elements oriented back to back and fed with 180° out of...
Circular polarized microstrip antennas are required in applications wherein an uncertainty in the direction of received signal polarization exist. In this paper an offset slot cut circular microstrip antenna to realize circular polarization in 1000 MHz frequency band is proposed. It yields axial ratio bandwidth of 10 MHz (∼1.2%). To increase the axial ratio bandwidth its gap-coupled array configuration...
A new type of antenna is presented in this paper. The main structure is a slot-loaded microstrip patch antenna fed by a half-width microstrip line. Two different types of antenna structure are combined together to make a single element antenna, and the radiation properties of both antennas are utilized in the proposed highly efficient antenna. Radiation from the antenna structure is achieved primarily...
Microstrip reflectarray antenna consisting of rectangular microstrip antenna as the feed and an array consisting of edge shorted rectangular patches, is proposed. Four reflect array configurations namely, 1 × 3, 3 × 1, plus-shaped and 3 × 3 arrays have been studied. A parametric study for varying distances between the fed patch and array of patches is presented. An optimum gain of around 8.8 dBi with...
New type of dielectric resonator antennas (DRAs) with axial symmetry are proposed for frequencies around 5.8 GHz. Each element uses a high permittivity cylindrical resonator and a low permittivity resonator of a truncated cone shape. Two types of microstrip-fed DRAs were investigated. By coupling the resonance modes, the first type and the second type DRA exhibit fractional impedance bandwidth of...
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