Open AccessPatch‐monopole monopulse feed for deep reflectors
Author(s) -
Miklavčič P.,
Vidmar M.,
Batagelj B.
Publication year - 2018
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2018.5753
Subject(s) - cassegrain antenna , optics , reflector (photography) , monopulse radar , axial ratio , offset dish antenna , physics , multi mode optical fiber , antenna feed , antenna (radio) , helical antenna , monopole antenna , microstrip , engineering , periscope antenna , telecommunications , radar , circular polarization , optical fiber , radar imaging , light source , continuous wave radar
A novel design for a simple and compact monopulse feed is presented for illuminating a deep reflector from the primary focal point, e.g. a rotationally symmetric single‐reflector parabolic antenna, with a diameter‐to‐focal‐distance ratio of around 0.4. The proposed feed is designed as a multimode circular cavity (cup) antenna. The elliptical patch excites a left‐hand‐circularly polarisedTE 11mode for the sum channel. The monopole in the centre of the patch excites the orthogonal, linearly polarisedTM 01mode for the difference channel. Two prototypes for such a feed were developed and fabricated, where the first was a proof‐of‐concept device and the second was a computer simulation‐optimised version. Both the simulations and the measurements of the optimised prototype are presented.