طراحی و شبیه‌سازی هورن دندانه‌دار گاوسی در باند W جهت استفاده در سامانه تصویربردار موج میلی‏متری

نوع مقاله : مقاله پژوهشی

نویسندگان

مجتمع دانشگاهی برق و کامپیوتر، دانشگاه صنعتی مالک اشتر، تهران، ایران

چکیده

در این مقاله، یک هورن با پروفایل گاوسی و دیواره دندانه‏دار در فرکانس مرکزی 94 گیگاهرتز طراحی و شبیه‏سازی شده است و با هورن مسطح طراحی شده با پروفایل گاوسی مقایسه شده است. آنتن هورن پیشنهاد شده شامل یک بخش دندانه‏دار عادی (مبدل مد و بخش فازی) و بخشی با پروفایل گاوسی است. آنتن هورن پروفایل گاوسی گذار هموارتری از موجبر تا دهانه را فراهم می‏کند، که تطبیق بین آنتن و فضای آزاد را بهبود می‏بخشد. این تطبیق بهتر، الگوی تابشی بهتر و پهنای باند بیشتری فراهم می‏کند و بازدهی کل سامانه را افزایش می‏دهد. هورن‌ دندانه‏دار نیز پراش لبه کم، تقارن الگوی بهبودیافته و قطبش عرضی کاهش‌یافته دارد، زیرا دندانه‌ها شرایط مرزی یکسانی برای میدان‌های الکتریکی و مغناطیسی ایجاد می‏کنند. تقارن الگوی هورن گاوسی دندانه‏دار طراحی شده در صفحات متعامد E و H، پهنای باند وسیع و همچنین سطوح گلبرگ جانبی پایین آن باعث می‏شود تا نماینده مناسبی جهت استفاده در تغذیه سامانه تصویربردار موج میلی‏متری  در باند W باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Design and Simulation of a Gaussian Corrugated Horn in the W Band for Millimeter Wave Imaging System

نویسندگان [English]

  • F. Jadidi
  • A. Eslami Majd
  • A. Erfaniyan
  • S. H. Mohseni Armaki
Department of Electrical and Computer Engineering, Maleke-ashtar University of Technology, Iran
چکیده [English]

In this paper, a Gaussian corrugated profile horn is designed, simulated and compared with a Gaussian profile horn with flat wall, at central frequency of 94 GHz. The proposed horn antenna consists of a corrugated section(mode converter and phase section) and a Gaussian profile section. The Gaussian profile Horn Antenna provides a smooth transition from waveguide to aperture, which improves matching between antenna and free space. This ensures better matching, better radiation pattern, more bandwidth and increases overall system efficiency. The corrugated horn also has low edge diffraction, improved pattern symmetry, and reduced transverse polarization, because these corrugations create same boundary conditions for electric and magnetic fields. The  symmetry pattern on the E and H orthogonal planes, the broad bandwidth as well as low sidelobes of this designed corrugated Gaussian profile horn, make it a good representative for use as a feed in millimeter wave imaging system in W band.

کلیدواژه‌ها [English]

  • Quasi-optics
  • Millimeter wave imaging
  • Profile horn
  • Gaussian horn
  • Corrugated horn
  • Symmetrical radiation pattern
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