Open AccessLow‐profile ring slot SIW antenna based on higher‐order cylindrical cavity modes
Author(s) -
Aghabeyki Peyman,
Moradi Gholamreza,
Sarraf Shirazi Reza
Publication year - 2020
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2019.0899
Subject(s) - optics , planar , conical surface , slot antenna , radiation pattern , antenna aperture , antenna efficiency , physics , antenna gain , antenna (radio) , electrical engineering , engineering , computer science , mechanical engineering , computer graphics (images)
A novel ring slot substrate‐integrated waveguides (SIW) antenna is presented based on higher‐order cylindrical cavity mode. First, TM 02 is used to realise a conical beam antenna. Electric field distribution on slot aperture generates four pairs of magnetic monopoles, each rotated 90° with respect to the centre of the cavity, resulting in a conical beam. By applying an offset to the feed point, the loading effect of slots generates a hybrid mode, which is a combination of TM 31 and TM 12 . The hybrid mode aligns the magnetic monopoles; thus, a high‐gain antenna with broadside radiation can be realised. The measured results show a 10.5% impedance bandwidth, 11.5 dBi gain, and 90% radiation efficiency. The proposed antenna is low‐profile and compact with a planar structure that could be integrated with other planar circuits; therefore, it could have many practical applications in communication systems.