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In this paper a highly broadband circularly polarized patch antenna design is shown. The design features several novelties which includes the use of a 3-phase feed circular patch for optimal axial ratio and the 3-phase microstrip feed structure to excite the patch antenna. Combining those techniques provides superior bandwidth in both return loss and axial ratio compared to classical rectangular patch...
Ultrawideband (UWB) systems have attracted great attention in recent years with their potential to support the large data bandwidths of modern media streams. To meet these needs, early UWB antenna designs have been rediscovered and improved upon, and a new generation of UWB antenna designs is emerging. This talk will present a historical introduction to UWB antennas. The importance of learning the...
In this paper the design of a high-gain planar antenna is presented. The antenna is designed to operate at 15GHz and has 24dB directivity. This design basically consists of four high-gain Yagi-Uda arrays, which are placed in parallel on a broad-side configuration and are excited uniformly through a feed network. The feed network and the antenna elements are all printed on the same substrate with the...
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...
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.
A curl antenna fed from a coaxial line has been proposed as a radiation element of circular polarization [1]. The curl antenna consists of vertical, horizontal linear sections, and a curled section. This paper presents the effects of the horizontal linear section on the radiation characteristics. The radiation characteristics for higher-order operation modes [2] of the curl antenna are also discussed.
A conventional antipodal Vivaldi antenna has characteristics of multiple-octave operation bandwidth but also relatively low directivity, main beam offset direction and asymmetric radiation patterns with frequency variation. In order to improve the directivity and radiation patterns, a design of a double-slot antipodal Vivaldi antenna is proposed. It makes synthetic radiation patterns by complementary...
Three dimensional (3D) antenna has evolved over the years from 2D planar antenna structure, by placing the radiating element and feed elements in different planes. The ideal 3D antenna configuration involves mechanically resting the antenna element on vertical conducting posts and electrically connecting the radiating element from the feed line patterned on different plane. However the conducting...
A broadband probe-fed array antenna for Ku-band applications covering 10.7–12.75 GHz, a bandwidth of 2.05 GHz, is proposed. The array antenna adopted 4×4 configuration with a parallel branch feeding network to set up required equal current magnitudes and phases. The antenna element in the array utilizes a vertical pillar to reduce the surface wave loss and increase operation bandwidth. The bandwidth...
In this paper, we aim to design a waveguide feeder for a parallel plate slot array antenna for a high resolution Synthetic Aperture Radar system on-board a 100 kg micro-satellite called Micro-XSAR, scheduled to be launched by Japan Aerospace Exploration Agency by 2020. In order to increase the antenna beam-width and thereby mitigate the frequency-dependent beam-shift, we employ center feeding using...
In this paper we present the design concept for a compact printed monopole antenna for super ultra-wideband (SUWB) applications. The proposed antenna operates over a large bandwidth of 1.5GHz–120GHz with a wide impedance bandwidth and has a return loss value lower than −10dB over the entire ultra band. The monopole features looks like a unique horn-shaped configuration to achieve super wideband frequency...
Due to the growth in wireless communication; the user demand for multiband, low cost, high gain, wideband and electrically small size antenna is increasing day by day. The above demands can be fulfilled by the use of Fractal geometry Antennas. In this survey, we have made the comparison of different fractal geometry antennas and techniques used for UWB applications and also observed about obtaining...
This paper presents a novel circularly polarized (CP) printed antenna with wide bandwidth and wide axial ratio (AR) beamwidth. The presented antenna is realized by bending a linearly polarized dipole into “S” shape with variable line width, which achieves circularly polarized radiation. Key parameters in designing such an “S” antenna are discussed and studied. It is found that this “S” antenna has...
This paper describes a low-profile broadband 2×2 metasurface-based circularly polarized (CP) array antenna using a sequentially rotated series-parallel feed. The single element is a truncated corner square patch sandwiched between the ground plane and the metasurface of a lattice of 4×4 metal plates. These antennas are incorporated with the feeding network to achieve broadband operation. The 2×2 metasurface-based...
An ultra-wideband (UWB) W-shaped patch antenna with defected ground is presented in this paper. Design, simulation and the analysis of the proposed single layer line feed antenna is done in CST Microwave Studio with 10.3 GHz operating frequency. The simulated results reveal that, the presented W-shaped line fed antenna offers a very wide bandwidth of 507 MHz ranging from 10.146 GHz to 10.653 GHz....
A novel Flaps antenna for W-band application is proposed in this paper, it can reach a wider bandwidth compared with the conventional reflectarray antenna. The structure of this antenna element is slotted square ring combined cross ring, this new element can get a bigger range of phase variation, which leads to wider bandwidth for the Flaps antenna, and a linear Flaps antenna operating at 94 GHz is...
A wideband, singly fed, circularly polarized, elliptical dielectric resonator antenna has been designed using a conformal open loop antenna in conjunction with a concentric parasitic open loop. A wideband 3dB axial ratio has been achieved over a bandwidth of ∼12% with an impedance matching bandwidth of ∼23% over the same frequency bandwidth.
In this paper a design of linearly and circularly polarised Bull's Eye antenna is presented. The proposed antenna consists of two identical rectangular slots in a shape of cross surrounded by symmetric periodic grooves drilled in the surface of metallic plate. The antenna can operate on vertical, horizontal and circular polarisation over its entire bandwidth. It resonates at 14.8 GHz and it has a...
This study contains theoretical analysis of a single element microstrip patch antenna model by using high frequency structural simulator (HFSS) simulation software to support X-Band applications. In our simulations, FR4 epoxy was used as dielectric material with relative permittivity of 4.4. Also, in order to enhance the gain and the bandwidth of the proposed antenna, 4×1 array element is applied...
In Simultaneous Transmit and Receive (STAR) systems, antenna port isolation is important as it reduces coupling between transmit and receive chains. If the coupling is too high, the transmit signal can leak into the receive path and saturate the receiver. In this paper, we present a dual-polarized four-arm spiral array operating from 3 to 5 GHz for concurrent right hand and left hand circular polarizations...
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