A High-Power Reflector Impulse Antenna with Dual-Tem Source
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A High-Power Reflector Impulse Antenna with Dual-Tem Source Chen Guo & An-xue Zhang & Hui Wu & Yan-sheng Jiang & Wen-bing Wang
Received: 13 November 2007 / Accepted: 4 June 2008 / Published online: 3 July 2008 # Springer Science + Business Media, LLC 2008
Abstract There are different demands on radiation efficiency and direction pattern according to various ultra-wideband (UWB) antennas and high power applications. To obtain more radiating gain on bore-sight of paraboloidal reflector and centralized radiating direction, a novel feeding structure called dual-TEM source has been designed and applied in half-paraboloidal reflector impulse radiating antenna (IRA) applications. Simulation results proved that this proposed half-paraboloidal reflector IRA with dual-TEM source provided greater radiation performance on bore-sight as a result of the synthesized power in the aperture space of paraboloid. Moreover, lots of simulation work and comparison have been done in different feeding models to summarize a relative optimal feeding structure. Keywords High-power . Ultra-wideband (UWB) . Impulse radiating antenna (IRA) . Finite-difference time-domain (FDTD) . TEM-horn antenna . Dual-TEM source
1 Introduction Of the various types of antenna for radiating and/or receiving transient pulses, TEM horn and paraboloidal impulse radiating antenna (IRA) with single TEM source [1] are widely used in ultra-wideband (UWB) and high power applications as two kinds of significant antenna forms. However, the radiation power of TEM horn antenna or IRAs with a single feeding source are limited and do not satisfy the demands of high power applications. Recently a novel approach being proposed is a transient array involving many sources feeding an aperture [2]. One of the arraying methods with several planar TEM horns described in [3] was to narrow the beam-width and improve the radiation energy. But more than two TEM horn antenna are required to form this kind of geometrical array and
C. Guo (*) : A.-x. Zhang : H. Wu : Y.-s. Jiang : W.-b. Wang Institute of Microwave Communication, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China e-mail: [email protected]
Int J Infrared Milli Waves (2008) 29:832–838
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inevitably much space has been occupied [4]. Moreover, this kind of antenna array required synchronization of exciting pulses for multi-source without phase difference which is difficult for source manufacture. Another arraying method was described in [5, 6], which is an IRA with dual-TEM horns vertically overlapped in the focus of a paraboloidal reflector. The whole structures of paraboloid and TEM horns were still required too much room. In this paper a novel half-paraboloidal reflector IRA with dual-TEM source has been designed according to the latter idea. The dual source is designed to radiate at an angle θ inside the focus of paraboloid synchronously, thus to satisfy the request of radiation power in high power applications. The improved radiation properties will be presented below.
2 Design and simulation of paraboloidal I
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