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ABSTRACT: A CPS-fed printed pentagonal-loop antenna with high gain, and broad beam is proposed. This antenna has not only the high gain of 11.7 dB, but also the low cross-polarization level less than −44 dB. Furthermore, the broad beam width with more than 60°HPBW (Half Power Beam Width) in the E plane is able to avoid the demand of precise main beam alignment. With these advantages, it can be used in the low power density applications of rectenna systems and radio frequency front-ends. For measuring, a balun from the CPS to the microstrip line is designed. The measured results are in agreement with the simulated ones. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1188–1191, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24292
Microwave and Optical Technology Letters 03/2009; 51(5):1188 - 1191. · 0.62 Impact Factor
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ABSTRACT: A novel stepped-impedance resonator (SIR) and its simplified equivalent circuit are proposed in this paper. The frequency responses of the SIR with different sizes are analyzed by the full-wave electromagnetic (EM) simulator. A novel low-pass filter (LPF) with two transmission zeros is designed and fabricated based on the SIR. The measured 3 dB cutoff frequency fc is 7.2 GHz with 0.3 dB ripple level in the pass-band. The rejection bandwidth of the insertion loss more than 15 dB is 9 GHz. The experimental results show good agreement with simulated ones, which validates the effectiveness of the SIR equivalent circuit and the feasibility of the novel SIR LPF.
Microwave Conference, 2008 China-Japan Joint; 10/2008
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ABSTRACT: Bow-Tie loop printed antenna with high gain and broad beam width for 5.8 GHz rectenna application is proposed, analyzed and measured. The high gain of 9.5 dBi can receive more power in a certain power density. And the broad beam width with 90 degrees HPBW (Half Power Beam Width) is able to avoid the precise main beam alignment. The proposed antenna still has the cross polarization level more than 30 dB, and the front-to-back ratio is about -20 dB in the broadside direction. The details of the simulated and experimental results for the proposed design are presented and discussed.
Circuits and Systems for Communications, 2008. ICCSC 2008. 4th IEEE International Conference on; 06/2008
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ABSTRACT: In this article, a printed U-type ultra wide-band (UWB) antenna is designed for UWB communication using a microgenetic algorithm (MGA) in conjunction with the finite-difference time-domain (FDTD) method. A stepped microstrip configuration which improves the impedance bandwidth is optimized by using MGA and FDTD to achieve the UWB characteristics. The measured VSWR of the antenna is less than 2 from 3.1 GHz to 10.6 GHz. The proposed antenna has a good radiation characteristic by measurement and the simulated gain is between 3.3 and 6 dB. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1289–1292, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23358
Microwave and Optical Technology Letters 03/2008; 50(5):1289 - 1292. · 0.62 Impact Factor
