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Microwave conical horn antenna with dual circular polarization—Close‐form design equations
Author(s) -
Chakrabarti Satyajit
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.21398
Subject(s) - horn antenna , bandwidth (computing) , center frequency , conical surface , multi band device , optics , frequency band , circular polarization , axial ratio , physics , fractional bandwidth , electrical impedance , microwave , radio spectrum , impedance matching , polarization (electrochemistry) , acoustics , antenna (radio) , engineering , geometry , directional antenna , telecommunications , slot antenna , mathematics , band pass filter , microstrip , chemistry , quantum mechanics , astronomy
In this article, we have proposed the closed form expressions for the optimized dimensions of different parts of the metallic stepped septum in a circular waveguide. Using these relations, a dual circularly polarized (CP) horn can be realized with good AR bandwidth, impedance bandwidth, and interport isolation. The relations are generalized for application at all frequency bands. Using these relations, horns have been designed and simulated at different frequency bands. Prototypes have been fabricated at some frequency bands and are experimentally validated. This design yields impedance bandwidth ( S 11 ≤ −10 dB) of about 18%, AR bandwidth more than 15%, and interport isolation about 24 dB at the band center. Experimental data for the Ka‐band prototype are provided in detail. At the design frequency, the measured axial rations are <1 dB revealing cross‐polar discrimination over 25 dB.