Communications: radio wave antennas – Antennas – Spiral or helical type
Reexamination Certificate
1998-08-04
2001-12-11
Wong, Don (Department: 2821)
Communications: radio wave antennas
Antennas
Spiral or helical type
C343S7000MS, C343S702000
Reexamination Certificate
active
06329962
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to antennas for mobile communication devices. More particularly, the present invention relates to a multiple band, multiple branch antenna.
BACKGROUND OF THE INVENTION
Because there are many different types of communication systems, such as GSM, DCS, PCS, DAMPS, and others, it is increasingly possible to have different types of systems serving a common area. These systems typically operate at different frequency ranges, e.g., GSM typically operates at 890-960 MHz and DCS typically operates at 1710-1880 MHz. In the future, it may be desirable to introduce any of a number of functions such as home based wireless phone, mini data link, wireless hands free set, etc. to a mobile telephone. For these reasons, a multiple mode antenna (that is, an antenna which can resonate at different frequencies to allow a communication device to operate in multiple bands) is highly desirable.
Some dual band antenna designs are known. The Japanese patent (6-37531) discloses a helix which contains an inner parasitic metal rod. In this antenna, the antenna can be tuned to dual resonant frequencies by adjusting the position of the metal rod. Unfortunately, the bandwidth for this design is too narrow for use in cellular communications. Dual band printed monopole antennas are known in which dual resonance is achieve by the addition of a parasitic strip in close proximity to a printed monopole antenna. While such an antenna has enough bandwidth for cellular communication, it requires the addition of a parasitic strip. Moteco AB in Sweden has designed a coil matching dual band whip antenna and coil antenna, in which dual resonance is achieved by adjusting the coil matching component (¼&lgr; for 900 MHz and ½&lgr; for 1800 MHz). While this antenna has relatively good bandwidth and radiation performances, its length is only about 40 mm. A non-uniform helical dual band antenna which is relatively small in size is disclosed in Applicant's copending, commonly assigned U.S. patent application Ser. No. 08/725,507, entitled “Multiple Band Non-Uniform Helical Antennas”, the entirety of which is incorporated herein by reference.
Typical dual band extendable whip antennas, such as those mentioned above, require a complicated matching network to match the whip antenna impedance to the two bands within 50 ohms. A dual band retractable antenna is disclosed in Applicant's copending, commonly assigned U.S. patent application Ser. No. 08/725,504, entitled “Retractable Multi-Band Antennas”, the entirety of which is incorporated herein by reference. Such an antenna includes two ports, one for a helical antenna and another for a whip antenna and a device for switching therebetween.
It would be desirable for a multiple mode portable communication device to have an efficient multiple band antenna. Conventional dual band helical antennas such as those described above have certain disadvantages. For example, mechanical production tolerances can change the resonant frequencies, particularly at higher bands. Also, it can be relatively difficult to provide a sufficient coupling for dual band parasitic coupling extendable antennas because the distance between a base antenna and the extendable whip can be different at different bands.
SUMMARY OF THE INVENTION
The present invention overcomes the above-described problems, and achieves additional advantages, by providing a multiple band, multiple branch antenna which can be tuned to multiple resonant frequencies. The multiple resonances for the antenna (corresponding to, for example, GSM, DCS or PCS bands) are achieved by providing variations in the printed pattern of the antenna branches. Each branch of the antenna can be printed on a relatively thin plastic film, and can be rolled into a cylindrical shape. Alternatively, the branches can be formed by etching patterns on a plastic member having a cylindrical or other suitable shape.
The multiple branch antenna of the present invention achieves resonance at different frequencies without a matching network. If the antenna branches are formed by printing, mechanical tolerance problems are avoided. The geometries of the branches can be varied to allow increased design freedom.
REFERENCES:
patent: 676332 (1901-05-01), Marconi
patent: 1837678 (1931-12-01), Ryder
patent: 2966679 (1960-12-01), Harris
patent: 2993204 (1961-07-01), Macalpine
patent: 3573840 (1971-04-01), Gouillou
patent: 4012744 (1977-03-01), Greiser
patent: 4121218 (1978-10-01), Irwin
patent: 4137534 (1979-01-01), Goodnight
patent: 4161737 (1979-07-01), Albright
patent: 4169267 (1979-09-01), Wong et al.
patent: 4229743 (1980-10-01), Vo et al.
patent: 4356492 (1982-10-01), Kaloi
patent: 4571595 (1986-02-01), Phillips et al.
patent: 4723305 (1988-02-01), Phillips et al.
patent: 4742359 (1988-05-01), Ishino et al.
patent: 4860020 (1989-08-01), Wong et al.
patent: 4868576 (1989-09-01), Johnson, Jr.
patent: 5020093 (1991-05-01), Pireh
patent: 5204687 (1993-04-01), Elliott et al.
patent: 5216436 (1993-06-01), Hall et al.
patent: 5255005 (1993-10-01), Terret et al.
patent: 5298910 (1994-03-01), Takei et al.
patent: 5311201 (1994-05-01), Lillie et al.
patent: 5317325 (1994-05-01), Bottomley
patent: 5353036 (1994-10-01), Baldry
patent: 5363114 (1994-11-01), Shoemaker
patent: 5386203 (1995-01-01), Ishihara
patent: 5436633 (1995-07-01), Liu
patent: 5438339 (1995-08-01), Itoh et al.
patent: 5446469 (1995-08-01), Makino
patent: 5451974 (1995-09-01), Marino
patent: 5467096 (1995-11-01), Takamoro et al.
patent: 5471221 (1995-11-01), Nalbandian et al.
patent: 5479178 (1995-12-01), Ha
patent: 5532703 (1996-07-01), Stephens et al.
patent: 5546094 (1996-08-01), Egashira
patent: 5548827 (1996-08-01), Hanawa et al.
patent: 5550820 (1996-08-01), Baran
patent: 5594457 (1997-01-01), Wingo
patent: 5612704 (1997-03-01), Cole
patent: 5621422 (1997-04-01), Wang
patent: 5635943 (1997-06-01), Grunwell
patent: 5661496 (1997-08-01), Baek et al.
patent: 5709832 (1998-01-01), Hayes et al.
patent: 5828342 (1998-10-01), Hayes et al.
patent: 5838285 (1998-11-01), Tay et al.
patent: 5903240 (1999-05-01), Kawahata et al.
patent: 5936594 (1999-08-01), Yu et al.
patent: 5986609 (1999-11-01), Spall
patent: 5990847 (1999-11-01), Filipovic et al.
patent: 5990849 (1999-11-01), Salvail et al.
patent: 6069592 (2000-05-01), Wass
patent: 6166694 (2000-12-01), Ying
patent: 31 29 045 (1982-10-01), None
patent: 0 372 720 (1990-06-01), None
patent: 0 511 577 (1992-11-01), None
patent: 0 522 806 (1993-01-01), None
patent: 0 593 185 (1994-04-01), None
patent: 0 635 898 (1995-01-01), None
patent: 0 644 606 (1995-03-01), None
patent: 0 660 440 (1995-06-01), None
patent: 0 747 989 (1996-12-01), None
patent: 0 777 293 (1997-06-01), None
patent: 0 855 759 (1998-07-01), None
patent: 2 664 749 (1992-01-01), None
patent: 2175748 (1986-12-01), None
patent: 63-219204 (1988-09-01), None
patent: 6-37531 (1994-02-01), None
patent: 6-90108 (1994-03-01), None
patent: 6-152221 (1994-05-01), None
patent: H10-173430 (1998-06-01), None
patent: WO93/12559 (1993-06-01), None
patent: WO94/21003 (1994-09-01), None
patent: WO96/27219 (1996-09-01), None
patent: WO96/38882 (1996-12-01), None
patent: WO97/11507 (1997-03-01), None
patent: WO 97/49141 (1997-12-01), None
“Microwave Filters and Antennas for Personal Communication Systems” (Inverted-F Antenna For Portable Handsets), Feb. 22, 1994, Electronics Division, Professional Groups E12, Digest No. 1994/047.
“Short Sinusoidal Antennas for Wireless Communications” by M. Ali et al., 1995 IEEE, pp. 542-545.
“A Wideband Dual Meander Sleeve Antenna” by M. Ali et al., 1995 IEEE, pp. 1124-1127.
Patent Abstracts of Japan, JP-0236602, Sep. 30, 1994.
“Antennas” by J.D. Kraus, (McGraw-Hill Book Co., Inc.) pp. 173-178 (1950).
“Microwave Scanning Antennas” edited by R.C. Hansen, Peninsula Publishing, pp. 116-122 (1950).
Burns Doane Swecker & Mathis L.L.P.
Chen Shih-Chao
Telefonaktiebolaget LM Ericsson (publ)
Wong Don
LandOfFree
Multiple band, multiple branch antenna for mobile phone does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multiple band, multiple branch antenna for mobile phone, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiple band, multiple branch antenna for mobile phone will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2578891