Broad-band antenna for mobile communication

Details Broad-band antenna for mobile communication Broad-band antenna for mobile communication

2005-07-26

2005-07-26

Ho, Tan (Department: 2821)

Communications: radio wave antennas

Antennas

Microstrip

C343S702000

Reexamination Certificate

active

06922172

ABSTRACT:
The present invention provides a broad-band antenna for mobile communication in which a desired antenna characteristic is obtained in plural frequency bands of a portable phone or the like. A metal plate16having a suitable shape is disposed on an upper surface of a carrier14provided on a circuit board10,and a first and a second antenna elements functioning as inverted-F antennas respectively resonant at a first frequency band and a second frequency band higher than the former are formed by electrically connecting the metal plate16to a grounding plate12and the circuit board10by an earthing terminal18and a feed terminal20,respectively. A third antenna element24having a base end electrically connected to the feed terminal20and resonant at a third frequency band higher than the second frequency band is provided on a side surface of the carrier14,ends of the second antenna element and the third antenna element24are disposed to be spaced from each other by a distance of 0.1 wavelength or more of the third frequency band, and the end of the third antenna element24is disposed to be spaced from the grounding plate12by a distance of 0.01 wavelength or more of the third frequency band. Besides, the third antenna element may be made resonant at a fourth frequency band higher than the third frequency band, and a matching circuit to perform matching for the third frequency band may be provided.

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