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With compact folded method, a kind of folded crossed dipole ultra wideband antenna is proposed with omnidirectional radiation characteristics on the horizontal direction in this paper. The antenna is comprised of orthogonal crossed semicircular metal discs with twice 90° folded on both ends. Horizontal size is reduced obviously compared with original crossed semicircular disc antenna. This antenna...
A multi-band orthomode transducer design, which covers 89, 36.5, 22.3 and 18.6 GHz, the general operating frequencies of microwave radiometers, is presented in this paper. Excellent impedance matching and polarization purity are achieved across all the frequency bands. The coaxial-type orthomode transducer-junction can provide adequate isolation between ports of different frequencies, and avoid serious...
Integrating the concept of Antipodal Vivaldi antenna (AVA) and planar disc-shaped dipole, a half space radiation UWB antenna is proposed in this letter. The antenna adopted approximately 1/4 of the disc-shaped dipole as its radiator, fed by the AVA's exponential slot structure. The proposed antenna has an ultra-wide bandwidth and nearly half space radiation pattern. This character makes it applicable...
A polarized pyramid dielectric resonator antenna fed by rectangular slot aperture is presented. The proposed dielectric resonator with given width to length ratio is easy to generate left-handed circular polarization by clockwise rotation angle of 45°. By optimizing the design parameters, 3dB axial ratio bandwidth of 8.9% (8.86–9.68GHz, 820MHz) and impedance bandwidth of 45.8% (7.78–12.4GHz, 4620MHz)...
In this paper, a power divider is proposed. The presented divider consists four varactors and two microstrip lines. The divider has four ports, port 1, port 2, port 3 and port 4. Port 1 is the input port, and port 3, 4 are output ports. Besides, port 2 is the isolated port. When the capacitance of the four varactors is 0, the power is outputted in port 4. When the capacitance of the four varactors...
In order to achieve a ultra-wideband operating characteristics. A low profile dual-band absorbing structure is proposed, the two-dimensional periodic array double ring printed on a dielectric substrate, and insert the chip resistors in four symmetrical positions on the circumference of the ring. The RCS of the two-dimensional array of finite element simulation, the influence of the various parameters...
A novel balanced antipodal Vivaldi antenna (BAVA) featured with substrate cut-out (CUT), additional substrates (ADS) and mixed slot edge (MSE) is designed to operate from 10GHz to 40GHz. Without increasing the total dimensions, beam squint in E-plane which is considered to be the major defect of conventional BAVA is effectively negated by the asymmetric structure. Besides, the antenna has better than...
A novel dual-band dielectric resonator antenna (DRA) with reconfigurable radiation pattern has been proposed. The antenna adopts cylindrical dielectric resonator (DR) and coplanar waveguide ground fed, which has the potential to achieve dual-band characteristic. Some parallel parasitic strips on the bottom with two pairs of switches are printed on the two opposite sides of the cylindrical DR. The...
A triple-band antenna by combining the meander-line structure with an obtuse-angle bowtie monopole radiator is presented in this paper. The operating mechanism of the proposed antenna at the first operating frequency band is elucidated by treating the meander-line structure as a cascade model of three short-circuited branches. The experimental prototype of the proposed antenna is fabricated, and the...
A novel conical dielectric resonator antenna (DRA) with tunable radiation pattern has been proposed. The antenna adopts one type of conical dielectric resonator (DR) and arc-shaped coplanar waveguide ground, which has the potential to achieve wideband characteristic. The operating frequency range of the antenna is 1550MHz (8.96–10.51 GHz) or 1340MHz (9.53–10.87 GHz). Some parasitic elements with two...
Mobile communication between two moving objects is interesting because of its application in military and navigation. Cassegrain antenna, which is high gain and narrow beam, is the most common construction in mobile communication. To reduce the difficulty of position due to narrow beam, an FSS is proposed to obtain wide beam at some frequencies. The disk sub-reflector is used to decrease the axial...
A novel wide-illumination-angle feed for satellite communication which could operate simultaneously in Ku/Ka uplink and downlink bands is proposed in this paper, based on a highly efficient design routine. Excellent radiation performances and high reflection loss are achieved by employing multi scalar rings, hybrid mode launcher and coaxial structure. Cylindrical modal matching method is employed...
The coaxial annular aperture structure is applied in this paper to construct multi-layer phase-gradient metasurfaces with high transmission efficiency realizing anonymous beam steering at 35GHz. Simulation results confirm that normally incident plane wave is successfully refracted by 19° and 60°, which are in good agreement with the theoretical design by the generalized Snell's law.
An Antipodal Vivaldi antenna (AVA) with improved radiation and gain characters is proposed in this letter. In order to expand the frequency at the low-end bandwidth, three sets of slots are opened on each side of the antenna fins. For the purpose of increasing its performance at high frequency, the substrate structure between the arms of the antenna was designed as a triangular structure, thus minimizing...
A novel compact printed antenna fed by CPW with WLAN band rejection for UWB applications is proposed in this paper. This symmetrical antenna features three parts: a semicircular stub as the UWB radiator, a pair of modified compact patches which are integrated smoothly as the ground plane with the line-to-arc transition structures, and two U-shaped slots which are embedded on the ground plane to reject...
A dual-band conical dielectric resonator antenna with circular patch feed has been presented in this paper. Using conical dielectric resonator, the resonance frequency of monopole can be reduced contributing to antenna miniaturization, and high-order hybrid mode resonance can be achieved for another operating band. The circular patch fed by coaxial line performs the functions of the feeding structure...
A dual-polarized conical dielectric resonator antenna with hybrid feed mechanism is presented. The design for the proposed antenna excitation structure consists of slot fed by a microstrip line and a coplanar waveguide (CPW), providing the orthogonal polarizations. Dual-polarization can be well matched with the common −10dB impedance bandwidth of 1180MHz (24.4%). The overall dimension of the proposed...
A novel dielectric resonator antenna with an ultra-wideband (UWB) bandwidth and great time-domain performances has been proposed. The proposed feed for cone dielectric resonator antenna is a circular patch, which has the potential to achieve ultra-wideband characteristic. The operating frequency range of the antenna is 2.77–11.63GHz. The design provides constant group delay, consistent omni-directional...
In this paper, a new millimeter-wave transmitting/receiving antenna module for bioradar sensors was proposed. This antenna was designed operating at 24 GHz for remote contactless evaluation of the human organism adaptation to physical and mental stress. This module was divided into two parts, both of which were implemented by a microstrip array antenna sub-module. The feed networks were also optimized...
The paper describes an approach of indoor multiple moving target detection and tracking using Ultra Wide-band(UWB) signals. The approach utilizes estimating the time of arrival(TOA) of the UWB pulses through a linear antenna array, providing a real-time computation of moving targets position in X-Y plane. The results of the proposed approach show a reliable and responsive performance in monitoring...
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