Analysis of Circular Polarization of Cylindrically Bent Microstrip Antennas | Zendy

Tiiti Kellomäki | Zendy

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Analysis of Circular Polarization of Cylindrically Bent Microstrip Antennas

Author(s) -

Tiiti Kellomäki

Publication year - 2012

Publication title -

international journal of antennas and propagation

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.282

H-Index - 37

eISSN - 1687-5877

pISSN - 1687-5869

DOI - 10.1155/2012/858031

Subject(s) - bent molecular geometry , polarization (electrochemistry) , microstrip antenna , physics , circular polarization , optics , microstrip , axial ratio , linear polarization , conformal map , bending , geometry , engineering , antenna (radio) , telecommunications , structural engineering , mathematics , laser , chemistry , thermodynamics

When circularly polarized (CP) microstrip antennas are bent, the polarization becomes elliptical. We present a simple model that describes the phenomenon. The two linear modes present in a CP patch are modeled separately and added together to produce CP. Bending distorts the almost-spherical equiphase surface of a linearly polarized patch, which leads to phase imbalance in the far-field of a CP patch. The model predicts both the frequency shifting of the axial ratio band as well as the narrowing of the axial ratio beam. Uncontrolled bending is a problem associated especially with flexible textile antennas, and wearable antennas should therefore be designed somewhat conformal.

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