Effect of Primary Source Location on Fabry-Perot Resonator Antenna with PEC or PMC Ground Plate
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Effect of Primary Source Location on Fabry-Perot Resonator Antenna with PEC or PMC Ground Plate Zhen-guo Liu & Yong-xin Guo
Received: 27 April 2010 / Accepted: 31 May 2010 / Published online: 19 June 2010 # Springer Science+Business Media, LLC 2010
Abstract The radiation property of Fabry-Perot Resonator antennas made of PEC or PMC ground plate covered with a partially-reflecting surface effected by the primary source location is investigated theoretically, respectively. It is shown that the location of primary source affects the gain of Fabry-Perot Resonator antenna greatly, and the maximum of gain can be obtained when primary source is located at certain positions for these two types of ground plate. But the pattern bandwidth does not vary obviously with the source location, as long as the resonant condition on the height of Fabry-Perot cavity is satisfied. At the same time the normalized product of maxium of gain and its bandwidth act as a reasonable criterion for evaluating the performance of such kind of antenna, a function of reflection coefficient of partially reflective surface, trending to a certain limitation with increase of reflection coefficient is firstly proposed. Finally the simulated results of planar Fabry-Perot Resonator antenna are validated to have good agreement with the calculated theoretically, which is of great significance to antenna designing. Keywords Fabry-Perot Resonator antenna . Bandwidth of gain . Partially Reflective Surface (PRS) . Perfect Magnetic Conductor (PMC)
1 Introduction Fabry-Perot Resonator (FPR) antenna generally consists of a primary source backed with a metal ground plate and a partially reflective covered plate [1, 2]. Its highly directional
Z.-g. Liu (*) State Key Lab of Millimeter Waves, Southeast University, Nanjing 210096, China e-mail: [email protected] Z.-g. Liu : Y.-x. Guo Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576, Singapore Y.-x. Guo e-mail: [email protected]
J Infrared Milli Terahz Waves (2010) 31:1022–1031
1023
radiation properties and low complexity with single-feed system as compared to feeding networks used in conventional antenna arrays represent its key advantage. At the same time, a number of research results based on different viewpoints and analysis models have been obtained and proposed in the past years, such as leaky wave model [3–6], EBG defect model [7–10], FP cavity model [1, 2, 11, 12]. In addition, a perfect magnetic conductor (PMC) is used as the antenna ground plate rather than conventional PEC ground to reduce the profile of antenna [13–15]. A summary of this type of antenna is also presented in [16, 17]. But to our knowledge, for different types ground plate the radiation properties of this kind of antenna effected by primary source location has not been sufficiently studied. In this paper, the gain and its bandwidth properties of FPR antennas with different ground plate are analyzed theoretically based on FP cavity model and plane wave superimposition method [18].
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