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ABSTRACT: A new type of artifical metallic electromagnetic structure, high impedance electromagnetic surface (HIS), has been developed that is characterized by having high surface impedance. In this paper, the HIS is used as the antenna ground plane to suppress the propagation of surface waves and improve performance of Archimedean planner spiral antenna. Measured results reveal that the HIS can remarkably increase the gain of main lobe, decrease the back lobe, and reduce the mutual coupling between receiving antenna and transmitting antenna. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 129–131, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22097
Microwave and Optical Technology Letters 11/2006; 49(1):129 - 131. · 0.62 Impact Factor
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ABSTRACT: A novel microstrip dipole antenna with H-shaped slot coupled is presented. Several design variations are discussed. Compared to the traditional microstrip dipoles with rectangular coupling slot, this antenna which occupies smaller volume is more suitable to be integrated with other microstrip antenna or active devices.
Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings; 01/2006
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ABSTRACT: In this paper, a novel genetic algorithm (GA)-based AMC structure, which is made up of a high-impedance frequency-selective surface, is introduced. The aperture-coupled microstrip antenna using this structure has 10-dB less back radiation and 3–4-dB more gain than a conventional one. This structure has important reference value for antenna manufacturing. A practical antenna is fabricated, and the measured results basically agree well with the simulated ones. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 47: 20–22, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21069
Microwave and Optical Technology Letters 08/2005; 47(1):20 - 22. · 0.62 Impact Factor
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ABSTRACT: Photonic bandgap materials have significant applications in the elimination of surface wave on a microstrip antenna. In this paper, several kinds of microstrip structures are analyzed in order to assess their potential for constructing PBG materials. The microstrip structures are periodically loaded with cross dipoles, Jerusalem crosses, or square loops. Periodic Green's functions plus the method of moments (MoM) are introduced to obtain the nonlinear characteristics equation. The real roots are found to show the propagation characteristics of the periodic structure and the existence of bandgap is revealed. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 37: 457–458, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10949
Microwave and Optical Technology Letters 04/2003; 37(6):457 - 458. · 0.62 Impact Factor
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ABSTRACT: A high-impedance ground plane (HIGP) is used for a circular waveguide antenna. The benefits of using such a HIGP are related to the suppression of surface waves excited by the circular waveguide mouth, because the HIGP has a very obvious surface wave bandgap. Suppression or reduction of surface waves is expected to improve antenna efficiency and to bring a reduction of sidelobe level due to diffraction of the surface waves. In agreement with the expected result, the measured radiation patterns show that a 2 dB addition in the antenna gain and a 10 dB reduction in the back lobes, if the circular waveguide antenna working frequency is in the HIGP surface wave bandgap.
IEEE Antennas and Wireless Propagation Letters 02/2003; · 1.37 Impact Factor
