Source: http://www.google.com/patents/US20040137950?dq=5,884,272
Timestamp: 2014-10-24 07:54:00
Document Index: 32196304

Matched Legal Cases: ['art 4', 'art 5', 'art 6', 'art 6', 'art 4', 'art 5', 'art 6']

Patent US20040137950 - Built-in, multi band, multi antenna system - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA build-in, multi band, multi antenna system (1) for a protable communicaiton device (10) has a first antenna (2, 4, 5), which is resonant in first an second frequency band. A secon antenna (3) is resonant in a fourth frequency bank. The first antenna, the papasitic element and the second antenna are...http://www.google.com/patents/US20040137950?utm_source=gb-gplus-sharePatent US20040137950 - Built-in, multi band, multi antenna systemAdvanced Patent SearchPublication numberUS20040137950 A1Publication typeApplicationApplication numberUS 10/472,996Publication dateJul 15, 2004Filing dateMar 20, 2002Priority dateMar 23, 2001Also published asEP1378021A1, WO2002078123A1Publication number10472996, 472996, US 2004/0137950 A1, US 2004/137950 A1, US 20040137950 A1, US 20040137950A1, US 2004137950 A1, US 2004137950A1, US-A1-20040137950, US-A1-2004137950, US2004/0137950A1, US2004/137950A1, US20040137950 A1, US20040137950A1, US2004137950 A1, US2004137950A1InventorsThomas Bolin, Zhinong Ying, Johan Andersson, Andre Da Silva Frazao, Peter NordenstromOriginal AssigneeThomas Bolin, Zhinong Ying, Johan Andersson, Andre Da Silva Frazao, Peter NordenstromExport CitationBiBTeX, EndNote, RefManReferenced by (44), Classifications (31), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetBuilt-in, multi band, multi antenna systemUS 20040137950 A1Abstract A build-in, multi band, multi antenna system (1) for a protable communicaiton device (10) has a first antenna (2, 4, 5), which is resonant in first an second frequency band. A secon antenna (3) is resonant in a fourth frequency bank. The first antenna, the papasitic element and the second antenna are provided on a common flexible substrate. Images(11) Claims(9)
DETAILED DISCLOSURE [0019] A simplified illustration of the antenna system 1 according to the invention is given in FIGS. 1 and 2. The antenna system has a main antenna 2 for GSM/DCS/PCS and a separate smaller Bluetooth� antenna 3 positioned very close to the main antenna 2. As seen in FIG. 2, the antennas have a folded distribution which occupies a first plane where most of the antenna pattern is located, a second plane which is perpendicular to the first plane, and a third plane which is perpendicular to the second plane and parallel to the first plane. [0020] The main antenna 2 is a built-in patch with parasitic element, whereas the smaller Bluetooth� antenna 3 is a PIFA, however folded a little bit to fit the small space available. The combination of the antennas, their individual positions, and the folding together with the electrical connection are noteworthy features. [0021] A significant advantage with the antenna system according to the present invention is the size reduction that obtained by placing the antennas close together as well as the folding of the antenna patterns. [0022] The main antenna 2 comprises a dual band PIFA antenna with a GMS part 4 and a DCS part 5. In addition, the main antenna 2 comprises a parasitic PCS part 6. The main antenna 2 and the Bluetooth� PIFA antenna 3 are printed on the same flexible substrate (not shown in the drawings) and constitute a common flex film. [0023] The metal trace of the parasitic PCS part 6 is located between the main antenna 2 and the Bluetooth� antenna 3. It is resonant at PCS 1900 MHz, about � wavelength, and will function as a high impedance blocking between the main antenna 2 and the Bluetooth� antenna 3. [0024] By arranging the antennas in this manner, it is possible to reduce the overall size of the antenna system compared to if the parasitic element was not present. As can be understood, moving the antennas further apart, which would be necessary in the absence of the parasitic element, would increase the isolation between the main antenna and the Bluetooth� antenna. [0025] The antenna system 1 has five connection traces 7 a-7 e, which all are located in the third plane. Of these connection traces, the main antenna 2 has a ground trace 7 a (�Ground #1�) and a feed trace 7 b (�Feed #1�) for the GSM part 4 and the DCS part 5. The parasitic PCS part 6 has only a ground trace 7 c (�Ground #2�), whereas the Bluetooth� antenna 3 has a ground trace 7 d (�Ground #3) as well as a feed trace 7 e (�Feed #2�), as shown in FIG. 1. The actual width of the feed traces is a tradeoff between size and performance. By widening the feed traces, a better performance would be achieved. However, wider feed traces result in an increased size of the antenna system. [0026] As seen in FIG. 2, the antenna system 1 is connected to radio circuitry on a printed circuit board 13 (FIG. 5) through electrical feeding 8. As appears from FIGS. 3-5, the electrical feeding 8 is implemented as an antenna connector 11, which is mounted to the printed circuit board 13 and comprises a group of five pogo pins 12 (one for each connection trace 7 a-7 e). [0027] In a preferred embodiment, the flex film with the antenna system 1 is placed on a plastic antenna carrier 9, which will keep the film at its correct position with respect to the printed circuit board 13. FIG. 3 illustrates the antenna carrier 9 together with the antenna connector 11 and the primary side of a mobile telephone 10. [0028] The material used for the antenna carrier will affect the antenna performance. This is due to that the antenna carrier will act as a dielectric loading, changing the resonance frequencies of the antennas slightly. A lossy material, i.e. a material with a large dielectric constant, will give a better VSWR (Voltage Standing Wave Ratio) and hence a broader bandwidth, but will at the same time provide a lower antenna gain. As mentioned above, in the preferred embodiment the antenna carrier is made of plastic. However, other materials such as ceramic, mica, or glass could also be used as carrier material, depending on the desired working characteristics of the antenna system. [0029]FIG. 4 illustrates the base of the antenna system 1 unfolded in one plane above the antenna carrier 9. The antenna connector 11 with its pogo pins 12 is shown underneath the antenna carrier 9. [0030]FIG. 5 illustrates, again, the antenna system 1 unfolded above the antenna connector 11 and the pogo pins 12. The naked printed circuit board 13 is also shown. [0031]FIG. 6 shows return loss for the main antenna 2 and the Bluetooth� antenna 3. As seen, the antennas are tuned (designed) to work at slightly too high frequencies. This is done in order to compensate for losses that are introduced by the plastic cover and the rest of the mechanics underneath. [0032]FIG. 7 illustrates the isolation between the two antennas of FIG. 6. Obviously, the isolation is very good, even in the highest band despite the short distance between the antennas. [0033]FIG. 8 is a dimensioned drawing of the presently preferred embodiment of the antenna system. [0034] Finally, FIGS. 9-12 illustrates four alternative embodiments of the antenna system according to the invention. As can be seen from the figures different parts of the antenna system may look different depending on e.g. the amount of space available inside the portable communication device. [0035] The invention has been described above with reference to a presently preferred embodiment example. However, other embodiments than the one described above as well as many modifications, variations and equivalent arrangements are possible within the scope of the invention, as defined by the appended independent patent claim. 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examinerClassifications U.S. Classification455/562.1International ClassificationH01Q21/28, H01Q19/00, H01Q1/38, H01Q9/04, H01Q21/30, H01Q5/00, H01Q9/42, H01Q1/24Cooperative ClassificationH01Q21/28, H01Q19/005, H01Q5/0062, H01Q1/243, H01Q21/30, H01Q1/38, H01Q5/0072, H01Q9/0414, H01Q9/0421, H01Q5/0058, H01Q9/42European ClassificationH01Q5/00M, H01Q5/00K4, H01Q9/04B1, H01Q21/28, H01Q5/00K2C4A2, H01Q19/00B, H01Q9/04B2, H01Q1/24A1A, H01Q9/42, H01Q1/38, H01Q21/30Legal EventsDateCodeEventDescriptionMar 9, 2004ASAssignmentOwner name: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), SWEDENFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BOLIN, THOMAS;YING, ZHINONG;ANDERSSON, JOHAN;AND OTHERS;REEL/FRAME:015049/0025Effective date: 20030903RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google