Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Reexamination Certificate
2008-07-01
2008-07-01
Nguyen, Hoang V (Department: 2821)
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
C343S7000MS, C343S810000, C343S817000, C343S818000
Reexamination Certificate
active
11843673
ABSTRACT:
A multi-band antenna for use, for example, in a wireless communications network, employs multi-resonant microstrip dipoles that resonate at multiple frequencies due to microstrip “islands.” Gaps in the microstrips create an open RF circuit except for desired frequencies. At a desired frequency, RF energy sees a gap as a short circuit between an island and the rest of a dipole antenna, thus, resonating at the desired frequency. In one instance, the multi-band antenna includes a first, second, third, and fourth dipole elements. Gaps between the first and third dipole elements and the second and fourth dipole elements are sufficiently small that the first, second, third, and fourth dipole elements form a second dipole having a corresponding dipole wavelength longer than that of the first dipole.
REFERENCES:
patent: 6529170 (2003-03-01), Nishizawa et al.
patent: 6965353 (2005-11-01), Shirosaka et al.
Nortel Networks. “GSM 900/1800/1900 Univity GSM Base Transceiver Station eCell” (2002) Product Bulletin, 2 pages, no date avail.
Katherin. “UMTS Antennas from the World's Largest Antenna Supplier” (1999) Product-Marketing, Mobile Communication Antennas, 4 pages, no date avail.
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Katherin. “Technical Information and New Products: Cellular Systems” located at www.katherin.de/de/mca/techn-infos/download/9985654.pdf, last viewed Oct. 23, 2006, 16 pages.
Amin Turocy & Calvin LLP
AT&T Mobility II LLC
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