Broad-band matching of antennas using dual-mode radiators
- Resource Type
- Conference
- Authors
- Hunter, I.
- Source
- 33rd European Microwave Conference Proceedings (IEEE Cat. No.03EX723C) European microwave conference Microwave Conference, 2003. 33rd European. 1:431-434 Vol.1 2003
- Subject
- Components, Circuits, Devices and Systems
Engineered Materials, Dielectrics and Plasmas
Fields, Waves and Electromagnetics
Aerospace
Communication, Networking and Broadcast Technologies
Photonics and Electrooptics
Bandwidth
Resonance
Microwave theory and techniques
Microwave antennas
Microstrip antennas
Patch antennas
Polarization
Microwave filters
Resonator filters
Impedance
- Language
This paper describes a new method for increasing the bandwidth of microwave antennas. This is achieved by recognizing that microstrip patch antennas may support two orthogonal resonant modes, or polarizations. These resonant modes may be modelled by a simple filter network, consisting of two coupled resonators, which represents the input impedance of such a dual-mode antenna. A novel and simple method of maximizing the bandwidth of the input reflection coefficient of a dual-mode antenna, by suitable choice of resonator couplings is presented. This method provides a theoretical bandwidth improvement of more than 300% when compared with a single mode antenna. The result is experimentally confirmed. From a practical point of view the method could have useful application in the design of antennas for mobile phones.