The Rectangular Waveguide Board Wall Slot Array Antenna Integrated with One Dimensional Subwavelength Periodic Corrugate
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The Rectangular Waveguide Board Wall Slot Array Antenna Integrated with One Dimensional Subwavelength Periodic Corrugated Grooves and Artificially Soft Surface Structure Cheng Huang & Zeyu Zhao & Xiangang Luo Received: 21 October 2008 / Accepted: 25 November 2008 / Published online: 20 December 2008 # Springer Science + Business Media, LLC 2008
Abstract In this letter, we propose a high gain rectangular waveguide board wall slot array antenna, which is integrated with one dimensional subwavelength periodic corrugated grooves and artificially soft surface structure. The corresponding far field radiation characteristics are investigated. The simulation results show that the gain of planar 2×8 slot array antenna with the introduction of corrugated grooves structure is increased to 26.1 dB, and half power beamwidth in the E plane is considerably reduced. Compared with the subwavelength periodic grooves slits array antenna proposed by Huang et al.[Appl. Phys. Lett. 91, 143512 (2007)], the side and back lobe level of this antenna are also significantly reduced by 6 dB and 10 dB, respectively. The physical mechanism for radiation-pattern improvement has been well explained by the modulation of surface wave, the reradiation of surface energy, and suppression of surplus surface wave at the grounded edge. Keywords Subwavelength periodic corrugated grooves . Artificially soft surface structure . Surface wave . Slot array antenna
1 Introduction The rectangular waveguide board wall slot array antenna is widely used in a broad range of modern radar and communication systems due to its high efficiency, lightweight, compact size and so on. However, the planar slits array antenna fed by waveguide has a large conducting plane, and the ground plane is always finite in reality. When the surface current propagates to the ground plane edges, the diffraction of surface wave would cause a significant amount of wasted energy in the backward radiation and degrade the radiation-pattern, thus decreasing the antenna efficiency. Recently, the introduction of the electromagnetic band-gap (EBG) has attracted great attention and been extensively studied in the antenna community [1–6]. Based on its band-gap features, L. Li et al. [6] has utilized EBG structures as the ground plane of slits array antenna to prevent the surface wave from propagating over it, and 2 dB improvement of antenna gain C. Huang : Z. Zhao : X. Luo (*) State Key Laboratory of Optical Technologies for Microfabrication, Institute of Optics and Electronics, Chinese Academy of Sciences, P.O. Box 350, Chengdu 610209, China e-mail: [email protected]
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J Infrared Milli Terahz Waves (2009) 30:357–366
had been obtained. Meanwhile, the promising results of enhanced transmission and beaming effect obtained in the optical regime [7–10] for subwavelength slit surrounded with periodic grooves simulated our interest to make this corrugated structure applicable to the antenna fields. A number of studies have proved that this extraordinary phenomenon also exists in the microwave range [11–13
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