List of Articles Substrate integrated waveguide

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  1 - Pattern Synthesis of Substrate Integrated Waveguide Leaky-Wave Antennas Using Optimization Algorithm
  Farnoosh Heidari Zahra Adelpour Naser Parhizgar
  In the modern era, the antennas with cosecant squared pattern play a significant role in radar applic­ations. These applications are used to cover an airspace to search for targets and estimate their height. In this article, a method is proposed for the synthesis of More

  In the modern era, the antennas with cosecant squared pattern play a significant role in radar applic­ations. These applications are used to cover an airspace to search for targets and estimate their height. In this article, a method is proposed for the synthesis of cosecant squared pattern using leaky wave antenna. The principal mechanism in the leaky wave antennae is wave attenuation due to power leakage while the wave propagates through the structure. Thus, by controlling the leakage and phase constants along the length of the structure, one can synthesize the desired radiation patterns. We have used the genetic algorithm to optimize the leakage constant and obtain the desired cosecant squared pattern In the range of 10 to 30 degrees. Conformity in simulation results and measured results indicates accuracy in the design process. The proposed method obtains the desired pattern with a ripple of less than 2 dB in the designated area and side lobe level less than -18 dB, which makes the antenna suitable for radar applications. Manuscript profile
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  2 - Waveguide-Type Directional Coupler Based on Substrate Integrated Waveguide (SIW)
  Zohreh Pourgholamhossein Reza Safian
  Substrate Integrated Waveguide (SIW) is a new type of guided wave structure which could be implemented in both microwave and millimeter wave integrated circuits. In this paper a novel waveguide type directional coupler based on substrate integrated waveguide consisting More

  Substrate Integrated Waveguide (SIW) is a new type of guided wave structure which could be implemented in both microwave and millimeter wave integrated circuits. In this paper a novel waveguide type directional coupler based on substrate integrated waveguide consisting a double layer dielectric substrate is proposed. The design process is carried out using coupling theory and Chebyshev method. The proposed structure is fully based on SIW structure except at the input-output ports which are microstrip lines. The SIW bends are optimized for the lowest insertion loss using HFSS software. The center frequency of designed 20dB coupler is at 10GHz with 6GHz bandwidth.  Based on the simulations the coupling remains almost constant over the coupler bandwidth with less than 2 dB variations. Larger bandwidth can be achieved by increasing the number of apertures. Also if we used a second set of apertures opposite side wall, the coupling would be increased by 6 dB. Manuscript profile
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  3 - Design of a Miniaturized SIW Filter by Using DGS in WLAN Frequency Band
  Mohsen Mirchouli Nasrin Amiri
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