Antenna for a plurality of bands

Details Antenna for a plurality of bands Antenna for a plurality of bands

2003-11-10

2008-09-02

Owens, Douglas W. (Department: 2821)

Communications: radio wave antennas

Antennas

Microstrip

C343S846000

Reexamination Certificate

active

07420511

ABSTRACT:
The present invention provides an antenna for multiple bands employing a single antenna element10, capable of operating in multiple frequency bands, and ideal for size reduction purposes. One end A of an antenna element10is electrically connected to a feeding point12and intermediate points B and C and the other end thereof is electrically connected via switches SWb, SWc, and SWd to a ground conductor14. The electrical lengths of the antenna element10from the terminal to the intermediate points B and C plus connection lines from these points via the switches SWb and SWc to the ground conductor 14 and the electrical length from the one end A to the other end D plus a connection line from the other end via the switch SWd to the ground conductor14are set to be capable of resonating different desired frequency bands. By closing one of the switches SWb, SWc, and SWd, one of the desired frequencies can be selected and the antenna can resonate with that frequency. Thus, the antenna employing the single antenna element10can operate in multiple frequency bands.

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