The Experts below are selected from a list of 135840 Experts worldwide ranked by ideXlab platform
Richard W Ziolkowski - One of the best experts on this subject based on the ideXlab platform.
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design and testing of simple electrically small low profile huygens source antennas with broadside Radiation Performance
IEEE Transactions on Antennas and Propagation, 2016Co-Authors: Mingchun Tang, Hao Wang, Richard W ZiolkowskiAbstract:The efficacy of a simple, electrically small, low-profile, Huygens source antenna that radiates in its broadside direction is demonstrated numerically and experimentally. First, two types of electrically small, near-field resonant parasitic (NFRP) antennas are introduced and their individual Radiation Performance characteristics are discussed. The electric one is based on a modified Egyptian axe dipole NFRP element; the magnetic one is based on a capacitively loaded loop NFRP element. In both cases, the driven element is a simple coax-fed dipole antenna, and there is no ground plane. By organically combining these two elements, Huygens source antennas are obtained. A forward propagating demonstrator version was fabricated and tested. The experimental results are in good agreement with their analytical and simulated values. This low profile, $\sim 0.05\lambda _{0}$ , and electrically small, $ka = 0.645$ , prototype yielded a peak realized gain of 2.03 dBi in the broadside direction with a front-to-back ratio of 16.92 dB. A backward radiating version is also obtained; its simulated current distribution behavior is compared with that of the forward version to illustrate the design principles.
Mingchun Tang - One of the best experts on this subject based on the ideXlab platform.
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design and testing of simple electrically small low profile huygens source antennas with broadside Radiation Performance
IEEE Transactions on Antennas and Propagation, 2016Co-Authors: Mingchun Tang, Hao Wang, Richard W ZiolkowskiAbstract:The efficacy of a simple, electrically small, low-profile, Huygens source antenna that radiates in its broadside direction is demonstrated numerically and experimentally. First, two types of electrically small, near-field resonant parasitic (NFRP) antennas are introduced and their individual Radiation Performance characteristics are discussed. The electric one is based on a modified Egyptian axe dipole NFRP element; the magnetic one is based on a capacitively loaded loop NFRP element. In both cases, the driven element is a simple coax-fed dipole antenna, and there is no ground plane. By organically combining these two elements, Huygens source antennas are obtained. A forward propagating demonstrator version was fabricated and tested. The experimental results are in good agreement with their analytical and simulated values. This low profile, $\sim 0.05\lambda _{0}$ , and electrically small, $ka = 0.645$ , prototype yielded a peak realized gain of 2.03 dBi in the broadside direction with a front-to-back ratio of 16.92 dB. A backward radiating version is also obtained; its simulated current distribution behavior is compared with that of the forward version to illustrate the design principles.
Hao Wang - One of the best experts on this subject based on the ideXlab platform.
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design and testing of simple electrically small low profile huygens source antennas with broadside Radiation Performance
IEEE Transactions on Antennas and Propagation, 2016Co-Authors: Mingchun Tang, Hao Wang, Richard W ZiolkowskiAbstract:The efficacy of a simple, electrically small, low-profile, Huygens source antenna that radiates in its broadside direction is demonstrated numerically and experimentally. First, two types of electrically small, near-field resonant parasitic (NFRP) antennas are introduced and their individual Radiation Performance characteristics are discussed. The electric one is based on a modified Egyptian axe dipole NFRP element; the magnetic one is based on a capacitively loaded loop NFRP element. In both cases, the driven element is a simple coax-fed dipole antenna, and there is no ground plane. By organically combining these two elements, Huygens source antennas are obtained. A forward propagating demonstrator version was fabricated and tested. The experimental results are in good agreement with their analytical and simulated values. This low profile, $\sim 0.05\lambda _{0}$ , and electrically small, $ka = 0.645$ , prototype yielded a peak realized gain of 2.03 dBi in the broadside direction with a front-to-back ratio of 16.92 dB. A backward radiating version is also obtained; its simulated current distribution behavior is compared with that of the forward version to illustrate the design principles.
Chonghu Cheng - One of the best experts on this subject based on the ideXlab platform.
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improved frequency notched ultrawideband slot antenna using square ring resonator
IEEE Transactions on Antennas and Propagation, 2007Co-Authors: Chonghu ChengAbstract:An improved frequency notched ultrawideband (UWB) microstrip slot antenna with a square ring resonator embedded in the tuning stub is proposed. The antenna is investigated numerically and experimentally for its impedance matching property, frequency notched characteristic and Radiation Performance in detail. As will be reported, compared with conventional frequency notched slot antennas, after incorporating a square ring resonator with the slot antenna's tuning stub, high, sharp band-rejection characteristic of over 20 dB is achieved, which is improved significantly.
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compact frequency notched ultra wideband fractal printed slot antenna
IEEE Microwave and Wireless Components Letters, 2006Co-Authors: Chonghu ChengAbstract:A novel frequency notched ultra-wideband (UWB) fractal printed slot antenna is proposed. The antenna is similar in configuration to a conventional microstrip-fed wide slot antenna, however, by introducing a Koch fractal slot, not only the size of the antenna is reduced significantly but also frequency notched function is achieved. Several properties of the antenna such as impedance bandwidth, frequency notched characteristics, Radiation patterns and gain, have been investigated numerically and experimentally in detail. As will be seen, the operation bandwidth of the antenna is from 2.85 to 12GHz, in which a frequency notched band from 4.65 to 6.40GHz may be achieved, and relatively stable, omnidirectional Radiation Performance over the entire frequency range has also been obtained.
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frequency notched ultra wideband microstrip slot antenna with fractal tuning stub
Electronics Letters, 2005Co-Authors: Chonghu Cheng, Yong ChengAbstract:A frequency notched ultra-wideband (UWB) microstrip slot antenna with a fractal tuning stub is proposed. The antenna is similar to a conventional microstrip slot antenna, and by introducing a fractal tuning stub, frequency notched function is achieved. The antenna was studied experimentally regarding impedance bandwidth, Radiation patterns and gain. The operation bandwidth of the antenna is from 2.66 to 10.76 GHz, in which a frequency notched band from 4.95 to 5.85 GHz was achieved, along with good Radiation Performance over the entire frequency range.
Shahrokh Jam - One of the best experts on this subject based on the ideXlab platform.
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Improved Radiation Performance of Low Profile Printed Slot Antenna Using Wideband Planar AMC Surface
IEEE Transactions on Antennas and Propagation, 2016Co-Authors: Hossein Malekpoor, Shahrokh JamAbstract:In this paper, a novel design of low profile printed slot antenna using wideband artificial magnetic conductor (AMC) is presented with improved Radiation Performance. For this purpose, the radiating slots with three unequal arms fed by coplanar waveguide are employed for broadening the impedance bandwidth with three resonances. It achieves a wide impedance bandwidth in the measured frequency range of 7.96–12.56 GHz ( $S_{11}\leq -10$ dB) for X-band applications. By loading a novel wideband planar AMC surface as the antenna ground plane, the Radiation properties of this printed slot antenna are enhanced. This design includes the measured −10 dB impedance bandwidth from 5.75 to 14.51 GHz (86.48%). The proposed wideband planar AMC design operates at the frequency of 10.15 GHz with ±90° reflection phase bandwidth of 8–12.38 GHz (43.15%). The AMC surface is designed with the $5\times 8$ array of periodic patches which are developed underneath the broadband printed slot antenna. In comparison with the proposed design without AMC, the printed slot antenna loaded with AMC introduces 62.82% size reduction, a bandwidth enhancement of 41.65%, and better impedance matching. It also contributes considerable features like a low profile antenna with unidirectional Radiation patterns and an increased gain of more than 10.6 dBi.
