Novel slot spiral antenna designs for dual-band/multiband operation

New applications for wireless communications are typically accompanied by a need for antennas that integrate several frequencies and functionalities under a single aperture. Different requirements for pattern, gain, and polarization at each operating frequency further complicate the design of such a...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2003-03, Vol.51 (3), p.430-440
Main Authors: Filipovic, D.S., Volakis, J.L.
Format: Article
Language:English
Subjects:
Antennas
Aperture antennas
Apertures
Automotive engineering
Design engineering
Digital
Digital audio broadcasting
Dual band
Frequency
Gain
Impedance matching
Polarization
Slot antennas
Spiral antennas
Spirals
Wireless communication
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Summary:New applications for wireless communications are typically accompanied by a need for antennas that integrate several frequencies and functionalities under a single aperture. Different requirements for pattern, gain, and polarization at each operating frequency further complicate the design of such antennas. Novel slot spiral antenna designs for dual-band/multiband operation are introduced. Typically excited to operate in the first mode, the proposed two-arm slot spiral is redesigned to operate efficiently in the second mode and in a hybrid first/second mode for better functionality. Several key features are introduced to achieve requirements for impedance matching, pattern, and gain suitable for a specific automotive dual-band DAB/SDARS (digital audio broadcasting/satellite digital audio radio services) antenna system. Among these features are new feeding systems, a suitable mix of spiral growth rates, and a low-loss spiral arm termination. The design is accomplished using full-wave finite-element boundary integral simulations and is verified with measurements.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2003.809872