آنتن چند گلبرگی سیمی دارای تشعشع همه جهته با قطبش دایروی در باندs

نویسندگان

دانشگاه علم و صنعت

چکیده

در این مقاله آنتن قطبش دایروی همه جهته با ساختاری ساده و ارزان قیمت که ترکیبی از شبه حلقه‌های کج می­باشد برای ارتباطات هوایی بدون سرنشین از جمله پهبادها و کوادکوپترها معرفی شده است. محیط هر حلقه آنتن، یک طول موج است و حلقه­ها با زاویه مشخص از هم به دور محور آنتن تکرار شده­اند. 90 درجه شیفت فاز بین دو میدان عمود بر هم که لازمه ایجاد قطبش دایروی است، ذاتا توسط خود آنتن و بدون نیاز به تغییر فاز بین حلقه‌های آنتن ایجاد می­شود. قطبش دایروی به دلیل تقارن ساختاری آنتن در هر دو صفحه azimuth و elevation ایجاد  می­گردد. پهنای باند امپدانس اندازه­گیری شده  dB10 حدود  MHz390 در فرکانس مرکزی  GHz2/45 و پهنای باند نسبت محوری کمتر از  dB3 در بازه فرکانسی GHz 2/1 تا  GHz2/5 ایجاد شده است. آنتن دارای قطبش دایروی راستگرد است و تفاوت بین الگو دایروی راست­گرد و چپ­گرد در تمام جهات حدود  dB20 است. همچنین بهره دایروی راست­گرد این آنتن حدود  dBi1/5 است.

کلیدواژه‌ها


عنوان مقاله [English]

Multi-Petal Antenna with Omnidirectional Radiation Using a Circular Polarization in the S Band

چکیده [English]

This paper presents a novel omnidirectional circularly polarized antenna with simple and low cost configuration designed by a combination of tilted semi loops antenna for unmanned aerial vehicle such as drone and quadcopter. Length of each semi loop is one wavelength that has been repeated around antenna axis with a specific angle. The 90° phase difference between two equally orthogonal polarized components is inherently provided by semi-loops and without the need for exciting semi-loops 90° out of phase. Symmetric configuration antenna yields in circular polarization in both the azimuthal and elevation plane. The measured results show that the 10-dB impedance bandwidth is 390MHz (range from 2.1GHz to 2.5GHz) at frequency of 2.45GHz and axial ratio bandwidth for less than 3dB is 400MHz (range from 2.1GHz to 2.5GHz). Also this antenna has a right hand circular polarization whose difference between the measured left hand circular polarization and the right and circular polarization gain is about 20 dB. The right hand circular polarized gain is about 1.5dBi.

کلیدواژه‌ها [English]

  • Axial Ratio
  • Circularly Polarized
  • Omnidirectional Pattern
  • Simple Structure
  • Unmanned Aerial Vehicle
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