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A low cost, simple and compact wideband circularly polarized slotted ground plane antenna design is proposed for mobile terminal. The dual annular perturbation slots antenna with asymmetric stub is built on the grounded substrate. The antenna is design to operate in a wideband that covers 1.85–3.02 GHz frequency band at 10 dB. The circularly polarized radiation patterns have been achieved through...
This paper presents an overview of the advances in single layer reflectarrays. In particular, it reports the progress in wideband reflectarrays and reconfigurable reflectarrays.
Two sequentially rotated, four stage, wideband circularly polarized high gain microstrip patch array antennas at Ku-band are investigated and compared by incorporating both unequal and equal power division based feeding networks. Four stages of sequential rotation is used to create 16×16 patch array which provides wider common bandwidth between the impedance matching (S11 < −10dB), 3dB axial ratio...
3×3 Split Ring resonators with inner ring rotation are etched at the back side of Circular microstrip antenna with elliptical rings. Rotation for multiple angles leads to an enhancement in impedance bandwidth. The selected UWB antenna has fabrication dimensions of 45 mm × 31mm × 1.27 mm. The rotation of the inner rings occur clockwise and counter clockwise for −47°, 33° and 10°. The preferable enhanced...
A suspended plate antenna (SPA) with L-probe feed is of interest as an efficient non-contacting feed method. It maintains high efficiency even when the plate is constructed of poorly conducting materials such as conductive inks. An SPA is designed at 10 GHz where fabrication tolerances can have an impact on performance. The SPA as designed has 36 percent impedance bandwidth and 8 to 9 dBi of gain...
Two-element ultra-wideband (UWB) multiple input and multiple output (MIMO) antennas are presented to obtain high isolation. The designed UWB-MIMO antennas are composed of two identical orthogonal antenna elements, and a defected ground structure with I-shaped slot and a pair of L-shaped stub are employed to get better isolation. Bandwidth of the proposed antennas range from 3.28 GHz-12 GHz. Also,...
Two dielectric resonators antenna (DRA) fed through slotted microstrip line for a wideband application is proposed. The two cylindrical DRs are asymmetrically situated with respect to the rectangular coupling aperture center with a defected ground plane. By optimizing the design parameters, two antenna configurations have been achieved: the first covering an impedance bandwidth of about 57%, from...
In this paper, two different designs of 3-element planar Yagi-Uda antenna based on the shape of driven and reflector elements are studied. To feed the driven element of Yagi-Uda antenna, a tapered microstrip balun is designed, which converts unbalanced coaxial feed to balanced microstrip line feed. Measured results of both the antennas are compared and it is shown that a planar Yagi-Uda antenna using...
The rectangular microstrip patch antenna with V shape slot is presented in this paper (Fig. 1). With this new configuration 33.5% impedance bandwidth with stable radiation pattern is achieved.
The single layer U-slot rectangular patch antenna has been found to provide impedance bandwidth of about 30% [1]. A bandwidth of up to 40% is obtained with a U-slot patch antenna stacked with a parasitic patch [2]. In this paper the effect of second U-slot stacked with the same geometry is presented, Fig. 1. A bandwidth as high as 46% is obtained.
A theoretical study is presented of the input impedance and bandwidth of biconical microstrip antennas asymmetrically excited by a coaxial probe feed. The antenna consists of a conducting cone cap on a grounded cone separated by an electrically thin dielectric. The structure is of biconical type. The analytic results for zero order modes (including the special case, TEM mode) of the biconical structure...
In general, despite the seemingly many advantages of the microstrip reflectarrays, one of the most serious shortcomings of these devices is the issue of limited bandwidth [1]. To improve the bandwidth of the variable-patch-size microstrip refiectarray, the variation in the patch size must be studied more thoroughly so that its phase variation properties, and thus its bandwidth characteristics, can...
A new technique is developed to best locate the coaxial feed of a circularly polarized stacked microstrip antenna (CPSMA) with the objective of improving the axial-ratio (AR) bandwidth and CP quality of the antenna. In the proposed technique, we move the single feed on an arc between the diagonal and main axis of the driven patch to optimize CP performance. An antenna based on this technique has been...
We have proposed and discussed a dual-spiral slot as a circularly polarized radiation element with a simple feeding system [1]. The dual-spiral slot located in the x-y plane, as shown in Fig. 1(a), has different radiation patterns in the x-z and y-z planes, due to its dual-element configuration. When the same radiation pattern is required in the x-z and y-z planes, the dual configuration is changed...
The usefulness of broadband impedance matching to increase the bandwidth of a microstrip patch antenna is illustrated using three different antenna configurations. Measured data for a patch antenna was incorporated into commercial CAD software to design a matching network. Design limitations are also discussed. Practical design examples and experimental results are given which clearly demonstrate...
It is well known that the bandwidth of a microstrip antenna can be increased by overlaying a parasitic element or director. A radioelectric model was presented [l] to explain this property in the case of a rectangular patch antenna. The purpose of this communication is a generalization of the analysis for an arbitrary shape symmetrical patch antenna coupled with a director. A quasi TEM two coupled...
Microstrip ring antennas are investigated numerically and experimentally. Depending on their selected geometry, they provide additional parameters that can be used to control their resonant frequency and impedance. Methods for improving their bandwidth and cross-polarization are also investigated.
The Microstrip reflectarray has been identified as one of the enabling technologies to achieve low mass, conformal mounting, wide-angle beam scanning, etc. [1] for NASA's future spaceborne high-gain antennas. It combines some of the best features of microstrip array antenna technology and the traditional parabolic reflector. Recently, the reflectarray antenna has found another horizon. It has the...
Although conventional microstrip patch antennas have attractive features of easy fabrication and compatibility with MMICs, but they have a narrow bandwidth and large size in some of applications at low frequency bands [1]. In phased array applications, smaller antennas could be packed tightly to take advantages of lower angle scanning as well as reduction of mutual coupling [2]. Hand held communications...
A rigorous analysis of an aperture-coupled stacked microstrip antenna is described. Developed from a coupled integral equation set employing spectral-domain Green's functions, the analysis includes all coupling, radiation and surface-wave effects. Optimization of the patch dimensions yielded VSWR bandwidths of greater than 20%. Theoretical and measured responses exhibited excellent agreement.
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