In this paper a design method for a circular polarized small-size microstrip antenna on a short dielectric layer is presented. It's known that exciting two detuned modes with a single coaxial probe makes possible circular polarization (CP) but as yet little efforts were made in order to control CP frequency and exact 50 ohm matching. A straight forward circuital model for the device can solve both this issues and gives hint for the best radiator design; our prototype is a circular disc slotted by a concentric elliptical cut in order to slightly perturb the central symmetry and obtain the modal degeneration. It includes a SPDT to allow the switching between the two CP. The prototype is designed for 2.44 GHz and exhibits a return loss of 19 dB, an impedance BW of 120 MHz a directivity of 6 dB and an estimated gain of 1.8 dB.

A Design Method for Single-Feed Wideband Microstrip Patch Antenna for Switchable Circular Polarization / S. Maddio; A. Cidronali; I. Magrini; G. Manes. - STAMPA. - (2007), pp. 262-265. (Intervento presentato al convegno European Microwave Conference tenutosi a Munich (D) nel 9-12 Oct. 2007) [10.1109/EUMC.2007.4405176].

A Design Method for Single-Feed Wideband Microstrip Patch Antenna for Switchable Circular Polarization

MADDIO, STEFANO
;
CIDRONALI, ALESSANDRO;MAGRINI, IACOPO;MANES, GIANFRANCO
2007

Abstract

In this paper a design method for a circular polarized small-size microstrip antenna on a short dielectric layer is presented. It's known that exciting two detuned modes with a single coaxial probe makes possible circular polarization (CP) but as yet little efforts were made in order to control CP frequency and exact 50 ohm matching. A straight forward circuital model for the device can solve both this issues and gives hint for the best radiator design; our prototype is a circular disc slotted by a concentric elliptical cut in order to slightly perturb the central symmetry and obtain the modal degeneration. It includes a SPDT to allow the switching between the two CP. The prototype is designed for 2.44 GHz and exhibits a return loss of 19 dB, an impedance BW of 120 MHz a directivity of 6 dB and an estimated gain of 1.8 dB.
2007
Proceedings of the 37th European Microwave Conference
European Microwave Conference
Munich (D)
9-12 Oct. 2007
S. Maddio; A. Cidronali; I. Magrini; G. Manes
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/392846
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