Source: http://www.google.com/patents/US7116276?dq=5,371,548
Timestamp: 2015-02-28 21:40:35
Document Index: 685486349

Matched Legal Cases: ['arts 35', 'art 31', 'arts 35', 'art 33', 'art 33', 'art 33']

Patent US7116276 - Ultra wideband internal antenna - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsThe present invention relates to an ultra wideband internal antenna, which is provided in a mobile communication terminal to cut off frequencies in a certain frequency band while processing ultra wideband signals. The ultra wideband internal antenna includes a first radiation part, a second radiation...http://www.google.com/patents/US7116276?utm_source=gb-gplus-sharePatent US7116276 - Ultra wideband internal antennaAdvanced Patent SearchPublication numberUS7116276 B2Publication typeGrantApplication numberUS 11/092,187Publication dateOct 3, 2006Filing dateMar 29, 2005Priority dateNov 15, 2004Fee statusLapsedAlso published asUS20060103577Publication number092187, 11092187, US 7116276 B2, US 7116276B2, US-B2-7116276, US7116276 B2, US7116276B2InventorsJae Chan LeeOriginal AssigneeSamsung Electro-Mechanics Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (4), Referenced by (27), Classifications (7), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetUltra wideband internal antenna
For antennas generally used for mobile communication terminals, there are helical antennas and Planar Inverted F Antennas (hereinafter referred to as �PIFA�). Such a helical antenna is an external antenna fixed on the top of a terminal and has a function of a monopole antenna. The helical antenna having the function of a monopole antenna is implemented in such a way that, if an antenna is extended from the main body of a terminal, the antenna is used as a monopole antenna, while if the antenna is retracted, the antenna is used as a λ/4 helical antenna.
The antenna shown in FIG. 2 is a wideband antenna disclosed in U.S. Pat. No. 5,828,340 entitled �Wideband sub-wavelength antenna�. A wideband antenna 2 of the U.S. Patent includes a tap 10 having a tapered region 20, a ground plane 14 and a feeding transmission line 12 on a substrate 4. The bottom end 18 of the tap 10 has a width equal to that of a center conductor 12 a of the feeding transmission line 12. The tapered region 20 is located between the top edge 16 and the bottom end 18 of the tap 10. Such a conventional wideband antenna has a frequency bandwidth of about 40%. However, when a radiation pattern in a horizontal plane, that is, a radiation pattern formed in y-z directions, is observed using a frequency function, the conventional wideband antenna exhibits isotropy in a low frequency band, but much radiation occurs in the transverse direction of the tap 10 (that is, a y direction) as the frequency increases. That is, the wideband antenna 2 is advantageous in that in an inexpensive planar wideband antenna can be implemented using Printed Circuit Board (PCB) technology, but problematic in that, as the frequency increases, serious distortion occurs and the antenna 2 has directionality. Further, the antenna is also problematic in that, since the size of the tap 10 emitting radiation is somewhat large, the tap 10 must occupy a large space in a mobile terminal.
The stubs 51 and 52 are formed in the shape of long striplines, and connected to cut parts 35 and 36 formed on the first radiation part 31 while protruding from the cut parts 35 and 36. Preferably, the stubs 51 and 52 are symmetrically formed around the feeding part 33. Further, the number of stubs 51 and 52 may be one, two or more depending on the frequency bands to be cut off by the antenna 50 according to the second embodiment of the present invention. Further, the stubs 51 and 52 can be formed asymmetrically around the feeding part 33. The stubs 51 and 52 have the characteristics of cutting off different frequency bands depending on whether an angle of inclination is �a� or �b� degrees with respect to the feeding part 33.
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