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Multi-band antennaMulti-band antenna description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20080150807, Multi-band antenna. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION
1. Field of the Invention The invention relates to a multi-band antenna, and particularly to a multi-band antenna which is adapted for configuring in portable electrical devices. 2. The Related Art There is a growing requirement for multi-band antennas used in wireless communication devices to adapt multi-band operation of wireless communication devices. It is necessary that an antenna adapting to being configured in wireless communication devices is capable of operating in various wireless communication bands such as GSM850 (Global System for Mobile communications), EGSM (Extended Global System for Mobile communications), DCS1800 (Digital Cellular System), PCS1900 (Personal Conferencing Specification), W-CDMA2100 (Wideband Code Division Multiple Access), Wi-Fi (Wireless Fidelity), etc. SUMMARY OF THE INVENTIONAn object of the present invention is to provide a multi-band antenna operating in various wireless communication bands. According to the invention, the multi-band antenna includes an antenna body defining opposite ends and a feeding conductor connecting to the antenna body. The antenna body has a first radiating branch defining opposite elongated edges, a second radiating branch extending from one end of the first radiating branch and a third radiating branch extending from the other end of the first radiating branch. Wherein the length of the first radiating branch is larger than the length of the second radiating branch and the length of the first radiating branch is also larger than the length of the third radiating branch. The feeding conductor is curved to U-shape having a feeding point. The feeding conductor has opposite side arms and a connecting portion. One end of each side arm respectively connects to the second radiating branch and the other end of each side arm respectively connects both ends of the connecting portion. An outer edge of one of the side arms is at the same level with an area where the first radiating branch connects to the second radiating branch. The feeding point is arranged at a corner of the feeding conductor near the outer edge connecting the first radiating branch. While the multi-band antenna operates at wireless communication, the multi-band antenna has a low frequency bandwidth and a high frequency harmonic bandwidth. According to the position where the feeding conductor connects to the antenna body, and the position where the feeding point is arranged at the corner of the feeding conductor, the multi-band antenna has a preferred range of the low frequency bandwidth and the high frequency harmonic bandwidth. Therefore, the low frequency bandwidth of the multi-band antenna includes GSM850 and EGSM bands and the high frequency harmonic bandwidth of the multi-band antenna includes DCP1800, PCS1900, W-CDMA2100 and Wi-Fi bands. BRIEF DESCRIPTION OF THE DRAWINGSThe present invention will be apparent to those skilled in the art by reading the following description of a preferred embodiment thereof, with reference to the attached drawings, in which: FIG. 1 shows the structure of a preferred embodiment of a multi-band antenna according to the present invention; and FIG. 2 illustrates the multi-band antenna configured in a notebook. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTPlease refer to FIG. 1, which shows the structure of a preferred embodiment of a multi-band antenna 100 according to the present invention. The multi-band antenna 100 is made of metallic substances for example, making from a metal foil, printing on a printed circuit board and etc, having an antenna body 1 and a feeding conductor 2. The antenna body 1 defining a first end 13 and a second end 14 includes a first radiating branch 10 defining opposite elongated edges. A second radiating branch 11 having the first end 13 extends from one end of the first radiating branch 10. In this case, the width of the first radiating branch 10 is narrower than the width of the second radiating branch 11 and the length of the first radiating branch 10 is longer than the length of the second radiating branch 11. A third radiating branch 12 having the second end 14 extends from the other end of the first radiating branch 10. The third radiating branch 12 is perpendicular to the first radiating branch 10. In this case, the length of the third radiating branch 12 is shorter than the length of the first radiating branch 10 and the width of the third radiating branch 12 is wider than the width of the first radiating branch 10. In this case, both the second radiating branch 11 and the third radiating branch 12 project toward the same direction. Continue reading about Multi-band antenna... Full patent description for Multi-band antenna Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Multi-band antenna patent application. Patent Applications in related categories: 20090295647 - electronic device and electronic assembly - An electronic assembly and electronic device used for radio frequency communications. The electronic device has a housing and an antenna feed point at least partially enclosed in the housing. There is at least one circuit board enclosed in the housing; an antenna counterpoise is coupled to the feed point. The ... 20090295653 - Antenna and radio communication apparatus - An antenna includes linear electrodes disposed on a surface of a substrate. A surface-mount antenna element including a capacitor is disposed in a non-ground region of a mount board. The capacitor is arranged such that portions of at least one of two linear electrodes face each other with a predetermined ... 20090295650 - Antenna device and wireless communication device - An antenna device includes a first dielectric plate; a radiating element formed on a surface of the first dielectric plate; a second dielectric plate; a first conductive plate formed on a surface of the second dielectric plate; and a magnetic plate provided between a back surface of the first dielectric ... 20090295648 - Antenna diversity systems for portable electronic devices - Antenna diversity systems are provided for portable electronic devices that have wireless communications circuitry and environment sensors. The wireless communications circuitry may include multiple redundant antennas that operate in one or more overlapping radio-frequency communications bands. 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