Communication antenna and equipment

Details Communication antenna and equipment Communication antenna and equipment

1999-09-20

2002-05-21

Wong, Don (Department: 2821)

Communications: radio wave antennas

Antennas

Microstrip

C343S702000, C343S833000, C343S834000, C343S895000

Reexamination Certificate

active

06392599

ABSTRACT:

TECHNICAL FIELD
This invention relates to a communication antenna and in particular it is concerned with a communication antenna for a mobile phone.
BACKGROUND ART
Known antenna for a mobile phone consist of a helix with or without a radiating straight element. The helix serves to provide for radial radiation/reception. However some energy is lost as circular polarised radiation along the axis of the ‘helicoil’ section.
DISCLOSURE OF INVENTION
According to a first aspect of the present invention there is provided a communication antenna having a driven element extending between a feed point and an attachment point to a top loaded element characterised in that the driven element is longer than the distance between the feed point and the attachment point.
According to a first preferred version of the first aspect of the present invention the driven element is configured to follow a meandering path between the feed point and the attachment point.
According to a second preferred version of the first aspect of the present invention or the first preferred version thereof the driven element is at least in part in the form of straight sections joined to give a zigzag configuration.
According to a third preferred version of the first aspect present invention or the first preferred version thereof the driven element is at least in part in the form of curved sections.
According to a fourth preferred version of the first aspect of the present invention or any preceding preferred version thereof the driven element is of a predetermined length relating to operating frequency band and return loss requirements.
According to a fifth preferred version of the first aspect of the present invention or any preceding preferred version thereof the antenna is equipped with at least a pair of parasitic elements the members of the pair being disposed on either side or on opposite sides of, and off-set from, the driven element and parallel or slant to a straight line linking the feed point to the attachment point; the parasitic elements serving to provide impedance matching and increased bandwidth and providing shielding against radiation from the antenna in a predetermined direction. Typically passive elements are incorporated parasitic elements to provide for an overall reduction in the size of the antenna.
According to a second aspect of the present invention there is provided a mobile phone incorporating an antenna according to the first aspect or any preferred version thereof.
According to a first preferred version of the second aspect of the present invention the antenna is formed as a printed circuit board or is deposited on a laminar member having a structural function for at least a part of the phone.
According to a second preferred version of the second aspect of the present invention or the first preferred version thereof the parasitic elements are disposed relative to the driven element to provide increased bandwidth and shielding against radiation from the antenna in a predetermined direction such as towards a user of the phone or at least towards the nearest part of a user of the phone.


REFERENCES:
patent: 4101898 (1978-07-01), Ingram
patent: 5668559 (1997-09-01), Baro
patent: 5936587 (1999-08-01), Gudilev et al.
patent: 0528775 (1993-02-01), None
patent: 0635898 (1995-01-01), None
patent: 0649181 (1995-04-01), None
Patent Abstracts of Japan; vol. 018, No. 447 (E-1594), Aug. 19, 1994 & JP 06 140820 A (Sansei Denki KK), 20, see abstract.
Morgan M A Et Al: “Eigenmode Analysis of Dielectric Loaded Top-Hat Monopole Antennas” IEEE Transactions on Antennas and Propagation, vol. 42, No. 1, Jan. 1994, pp. 54-61, CP000434716 The whole document (To follow).
Koichi Ogawa et al.: “A Diversity Antenna For Very Small 700-MHZ Band Portable Telephones” IEEE Transactions on Antennas and Propagation, vol. 42, No. 9, Sep. 1994, pp. 1342-1345, XP0004660904 See whole document.
Nakano H. et al: “Shortening Ratios of Modified Dipole Antennas” IEEE Transactions on Antennas and Propagation vol. 32, No. 4, Apr. 1, 1984, pp. 385/386 XP002011484, the whole document.

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