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Multi‐petal antenna with omnidirectional circular polarized radiation
Author(s) -
Nadi Morteza,
Amirhosseini Mohammad Khalaj
Publication year - 2018
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21271
Subject(s) - circular polarization , optics , omnidirectional antenna , physics , axial ratio , azimuth , turnstile antenna , bandwidth (computing) , radiation pattern , helical antenna , polarization (electrochemistry) , antenna (radio) , coaxial antenna , telecommunications , engineering , microstrip , chemistry
Abstract This article presented an omnidirectional circularly polarized antenna with simple and low‐cost configuration designed by combination of tilted loops for unmanned aerial vehicles such as drones and quadcopters. Length of each loop was 1 wavelength and was repeated around antenna axis with a specific angle. The 90° phase difference between 2 equally orthogonal polarized components was inherently provided by the loops without the need for exciting the loops 90° out of the phase. Symmetric configuration antenna yields circular polarization in both the azimuthal and elevation planes. The measured results showed that the 10‐dB impedance bandwidth was 390 MHz (ranging from 2.1 to 2.5 GHz) at the frequency of 2.45 GHz and the axial ratio bandwidth for < 3 dB was 400 MHz (ranging from 2.1 to 2.5 GHz). Moreover, this antenna had the right hand circular polarization with the difference between the measured left hand and right hand circular polarization gains being about 20 dB; the right hand circular polarized gain was about 1.4 dB.