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Operation principle of a dual-band loop-monopole composite antenna is investigated in detail. The prototype antenna under investigation is composed of two monopoles and a sectored loop. Each mode of the antenna is numerically studied by analyzing its surface current distribution and radiation pattern. It is shown that the antenna has three operation modes.
A planar dual-band antenna using off-centered feed structure is proposed and investigated. The antenna consists of an off-centered dipole and an asymmetrical slot radiator. Design guidelines of the antenna are drawn and design principle is analyzed first. By properly selecting the feeding position, an operating frequency band of 2.47 to 2.53GHz and 4.14 to 13.76GHz for return loss larger than 10dB...
This paper presents the design of high gain compact size pyramidal horn lens antenna for 71–76GHz band. The horn antenna aperture is covered by a planar single layer all dielectric lens that is composed of two dimensional periodic unit cells of λ/2 periodicity and low loss (≤1dB). The unit cell is used to design a 21 unit cell × 21 unit cell flat lens which occupied an area of 42mm × 42mm × 4.35mm...
A broadband Ku-band lens horn antenna for airborne SAR applications is presented in the paper. Several design equations, which create the geometric relation between the lens and the horn, are deduced, so the independent design variables are reduced, and the parametric sweep results can be obtained quickly in HFSS. Simulated results show that the antenna is less than 200mm in height, and its gain is...
A novel compact four bands antenna with coplanar waveguide feed is proposed for satisfying GSM, WLAN and WIMAX. Based on the triangle planar patch element, two different slots were embedded. The simulation of the antenna is performed by using software Ansoft HFSS and the results present that the number of multiband, the central of frequency and bandwidth can be controlled by the dimensions of the...
A cross plate antenna (XPA) is constructed by placing a cross-shaped conducting plate around a conducting body of revolution. The XPA realizes the omnidirectional radiation required for a base station antenna, showing an ultrawideband characteristic with an antenna height of less than 0.1 wavelength and a horizontal length of less than 0.4 wavelength at the lower edge operating frequency. In addition,...
A circularly-polarized (CP) rectangular dielectric resonator antenna (DRA) fed by a wideband feed network is introduced. The feed network is designed by using branch-line structure and named as wideband branch-line coupler (WBLC). The proposed WBLC delivers good impedance matching, equal power splitting and consistent 90° shifting over a wide bandwidth. It is demonstrated that for the presented rectangular...
This paper proposed a wideband antenna for global navigation satellite systems (GNSSs). The antenna has a −10 dB impedance bandwidth of 62.40% from 0.86 GHz to 1.64 GHz, 3 dB axial ratio (AR) bandwidth of 51.30% from 1.00 GHz to 1.69 GHz. Its circularly polarized (CP) bandwidth of 48.48% from 1.00 to 1.64 GHz covers the full band of four GNSSs (GPS, GLONASS, Compass and Galileo). In addition to utilizing...
In this paper a wide band slot antenna with a high gain and wide bandwidth is presented. The design is based on a coplanar waveguide (CPW) fed hybrid slot configuration. By applying simple tapering mechanism the gain and bandwidth of an antenna reported earlier have been improved by 4dbi and 28% respectively. The design presents a gain of 5.7 dbi and a very wide bandwidth of 77% covering both of X-band...
A broadband dual-polarization antenna element is presented in this paper. It contains four square-loop radiator dipoles and the quarter-wavelength balun. The antenna achieve a common impedance bandwidth of 1.54GHz-2.5GHz(S11<-10dB) at the input port, it has good performance in the isolation, which is more than 28.7dB, the gain of the antenna is above 8.2dB. In the entire operating frequency, the...
This paper introduces the research of applications of metamaterial-based antennas recently developed in our lab. They include the planar antennas with multi-band multi-function operation, high gain property and enhanced beam scanning ability.
In this paper, a broadband planar magic-T using 3-dB branch-line coupler and phase shifter is presented. The magic-T consisted of a planar branch-line coupler and a planar phase shifter respectively. Compared with the conventional magic-T, which using slot-line transition or waveguide magic-T. The proposed structure can be easily fabricated and integrated in system. Simulation results show our magic-T...
A broadband microstrip patch antenna with dual-polarization is presented in the paper. There are four feed-lines and a cavity-backed ground plane in the antenna. The patch is electromagnetically coupled by these feed-lines. The phase offset of the two feeding ports located symmetrically relative to the center of the patch is 180º, which affords a solution to improve the polarization purity and the...
A probe tangent to the patch fed stacked microstrip antenna for wide band high gain applications is presented. By employing only two patches with proper fixed ratio and applying the probe tangent to the patch for feeding another patch, a novel feeding antenna is designed with both high-gain (12 dBi) and wide-band [35%, standing wave radio (SWR ≤ 2)] characteristics. In addition, the 2-dB-gain bandwidth...
This paper presents investigation of novel circular polarized broadband clover leaf shaped antenna and classic twin dipole antenna mounted on lens for terahertz range. Compact, circular polarized broadband clover leaf antenna covering frequency band of 100–400 GHz, possessing properties of constant impedance and symmetric patterns, is quite new for terahertz detection. A twin dipole antenna is also...
A novel circularly polarized open-end circular waveguide antenna is studied. A pair of metal blocks is added to the circular waveguide cavity to generate circular polarization. The dimension of the metal blocks is adjusted for achieving good axial ratio characteristics of the new antenna. The frequency band is about 27.7% when s11 is less than −15dB. The axial ratio is better than 3dB over 19.3% frequency...
In this paper, a novel Sierpinski Carpet Fractal based Photonic Band Gap (PBG) structure is proposed. The parasitic holes drilled to form the fractal geometry improve the band gap performance. The application of the novel PBG on Hemispherical Dielectric Resonator Antenna (HDRA) improves the impedance bandwidth of operation (S11<-10 dB) from 10.4 % to 21% at 1.82 GHz. The antenna is excited by a...
This article proposes a novel reduce-size circularly polarized microstrip antenna. Slots are introduced in the microstrip patch to affect the distribute of the current, so the miniature area of the patch is obtained. This antenna is fed with a Wilkinson power divider and a 90 phase shifter to generate circular polarization. The antenna was be studied by using EM software HFSS. The results show that...
A dual-band circle polarization microstrip antenna at 1.57GHz and 2.45GHz is presented. We adopt double patch model and feed the top patch through the coaxial feed. Cutting angle and choosing appropriate feeding point was adopted to realize circular polarization of the two patches. The down patch can obtain a good match by moving the top patch. The performance change of the antenna by moving the top...
A novel planar dual-spiral monopole antenna with circular polarization (CP) operation is proposed. Dual asymmetrical strip-sleeves are utilized and shorted at the ground plane, the proposed CP design for 2.45 GHz band can easily be achieved and provides the impedance bandwidth (RL ≧10 dB) of about 240 MHz and the 3 dB axial-ratio (AR) bandwidth of about 130 MHz. The measured peak gain and radiation...
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