Premium
Effects of the feed network on the axial ratio of a patch antenna
Author(s) -
GarcíaGarcía Quiterio
Publication year - 1998
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/(sici)1098-2760(199809)19:1<42::aid-mop11>3.0.co;2-5
Subject(s) - wilkinson power divider , microwave , microstrip antenna , patch antenna , antenna feed , power dividers and directional couplers , antenna (radio) , engineering , axial ratio , effective radiated power , coaxial antenna , optics , physics , electrical engineering , electronic engineering , telecommunications , frequency divider
This paper presents, in analytical form, the relationship existing between the input match of a dual‐fed circularly polarized antenna and the feed network used, expressed in terms of their scattering matrices. The analysis shows that the radiating properties, particularly the axial ratio of the wave radiated, are strongly affected by mismatch at the antenna ports when a reactive power divider is used, while it remains unaffected with an isolated power divider. Feed network error effects are also contemplated, and their effect on the polarization purity of the element is addressed. A microstrip patch antenna has been used to illustrate this relationship both with simulated and measured results, although the formulation can be extended to other elementary radiators. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 19: 42–47, 1998.