Integrated multi-band antenna

1. Field of the Invention

The invention relates to an integrated multi-band antenna and more specifically, to an integrated multi-band antenna for use in a portable electrical device, especially a notebook.

2. The Related Art

According to the progress of the communication technology, the key development is the transfer from wired to wireless communication, such as the popularization of the wireless household phones, mobile phones and personal digital assistants. In the field of wireless communication, the signal is carriered through invisible electromagnetic wave. Therefore, the bridge between electrical signal and electromagnetic wave is an antenna. So the antenna is certainly needed by a wireless communication device to transmit or receive electromagnetic wave. The antenna is therefore an essential component in the wireless communication device.

A conventional antenna configured in the wireless communication devise can send and receive four bands wireless signal such as GSM850 (Global System for Mobile communications), EGSM (Extended Global System for Mobile communications), DCS1800 (Digital Cellular System) and PCS1900 (Personal Conferencing Specification). It is necessary that an antenna adapting to configure in the wireless communication device operates at various wireless communication bands further comprising W-CDMA2100 (Wideband Code Division Multiple Access), Wi-Fi (Wireless Fidelity).

An object of the present invention is to provide an integrated multi-band antenna capable of operating at various wireless communication bands.

According to the invention, the integrated multi-band antenna includes a first radiating element and a second radiating element spaced from the first radiating element. The first radiating element defines a first end, a second end, a first edge and a second edge opposite to the first edge. A slot is opened at the second edge of the first radiating element and being extended to the second end of the first radiating element. A feeding conductor with a first feeding point is arranged to close to the opening of the slot. A protrusion is arranged at the first end of the first radiating element and projected from the first edge of the first radiating element. A first ground portion is arranged to close to the feeding conductor.

The second radiating element has a first radiating segment defined opposite sides. A second radiating segment extends from one end of the first radiating segment. A third, a fourth, a fifth and a sixth radiating segments sequentially extend from the other end of the first radiating segment. The second and third radiating segments extend from opposite sides of the first radiating segment. A second feeding point is arranged at where the fourth radiating segment connects the fifth radiating segment. A second ground portion is spaced from the second feeding point.

The first radiating element is divided into a first portion with the slot and a second portion, seen from the feeding conductor. The first portion obtains an electrical resonance length of a quarter wavelength corresponding to a low frequency band including GSM850 and EGSM900 bands. The second portion obtains an electrical resonance length of a quarter wavelength corresponding to a high frequency band including DCS1800, PCS1900 and W-CDMA2100 bands.

The length from the second feeding point to the free end of the second radiating segment of the second radiating element is a quarter of the wavelength corresponding to Wi-Fi2.4 GHz and the length from the second feeding point to the free end of the sixth radiating segment of the second radiating element is a quarter of the wavelength corresponding to Wi-Fi5.2 GHz. Therefore, the integrated multi-band antenna obtains GSM850, EGSM900, DCS1800, PCS1900, W-CDMA2100, Wi-Fi2.4 GHz and Wi-Fi5.2 GHz bands through the first and second radiating elements.

The 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 a preferred embodiment of the structure of an integrated multi-band antenna according to the present invention;

FIG. 2 is a perspective view showing the preferred embodiment of the integrated multi-band antenna folded to configure in a back surface of a display of a notebook; and

FIG. 3 is a perspective view showing the preferred embodiment of the integrated multi-band antenna folded to configure in a front surface of the display of the notebook.

Please refer to FIG. 1 , showing a preferred embodiment of an integrated multi-band antenna 100 according to the present invention. The integrated multi-band antenna 100 is made of metallic substances for example, making from a metal foil, printing on a printed circuit board, etc. The integrated multi-band antenna 100 has a first radiating element 1 and a second radiating element 5 spaced from the first radiating element 1 .

In this case, the first radiating element 1 is a monopole antenna. The first radiating element 1 is substantially formed an elongated shape defining a first edge 10 , a second edge 11 opposite to the first edge 10 , a first end 12 and a second end 13 opposite to the first end 12 . The first radiating element 1 has a slot 14 opened at the second edge 11 thereon. The slot 14 has an opening portion 140 opened at the second edge 11 of the first radiating element 1 and an extension portion 141 being extended from the close end of the opening portion 140 . In this case, the wide range of the opening portion 140 is shorter than the length of the extension portion 141 .

A protrusion 15 is arranged at the first end 12 of the first radiating element 1 . In this case, the protrusion 15 projects from the first edge 10 of the first radiating element 1 . A feeding conductor 16 extends from the second edge 11 of the first radiating element 1 . The feeding conductor 16 is arranged to close to the opening portion 140 of the slot 14 . A first feeding point 2 is arranged at the free end of the feeding conductor 16 . A first ground portion 3 is spaced from the feeding conductor 16 . In this case, the first ground portion 3 is arranged to close to the feeding conductor 16 . In a further embodiment, the integrated multi-band antenna 100 has a first matching circuit 4 which electronically connects the first feeding point 2 and the first ground portion 3 .

The first element 1 is divided into a first portion with the slot 14 and a second portion, seem from the feeding conductor 16 . In this embodiment, the first portion obtains an electrical resonance length of a quarter wavelength corresponding to a low frequency band having GSM850 and EGSM900 bands. The second portion obtains an electrical resonance length of a quarter wavelength corresponding to a high frequency band having DCS1800, PCS1900 and W-CDMA2100 bands.

Still referring to FIG. 1 , the second radiating element 5 is also a monopole antenna in this embodiment. The second radiating element 5 includes a first radiating segment 50 defined opposite sides, a second radiating segment 51 extending from one end of the first radiating segment 50 , and a radiating strip section which has a third radiating segment 52 , a fourth radiating segment 53 , a fifth radiating segment 54 and a sixth radiating segment 55 connecting end to end in sequence wherein one end of the third radiating segment 52 connects to the other end of the first radiating segment 50 , and one end of the sixth radiating segment remains free. Respectively an angle which is formed where the first radiating segment 50 connects the second and third radiating segments 51 , 52 , where the fourth segment 53 connects the third and fifth radiating segments 52 , 54 and where the fifth segment 54 connects the sixth segment 55 .

In this case, the second radiating segment 51 and the third radiating segment 52 are perpendicular to the first radiating segment 50 respectively, which extend from opposite sides of the first radiating segment 50 . The third radiating segment 52 and the fifth radiating segment 54 are arranged to stand side by side. The fourth radiating segment 53 is perpendicular to the third radiating 52 and the fifth radiating segment 54 respectively.

Also, the first radiating segment 50 and the sixth radiating segment 55 are arranged to stand side by side. The width of the first radiating segment 50 is wider than other radiating segments 51 , 52 , 53 , 54 , 55 of the second radiating element 5 . The width of the radiating segments 51 , 52 , 53 , 54 , 55 of the second radiating element 5 is almost the same except the width of the first radiating segment 50 of the second radiating element 5 . The distance between the third radiating segment 52 and the fifth radiating segment 54 and the distance between the first radiating segment 50 and the sixth radiating segment 55 are almost the same.

The third radiating segment 52 of the second radiating element 5 is arranged to correspond to the first end 12 of the first radiating element 1 . A second feeding point 6 is arranged at the corner where the fourth radiating segment 53 connects to the fifth radiating segment 54 . A second ground portion 7 is spaced from the corner where the fourth radiating segment 53 connects to the fifth radiating segment 54 . In this case, the second ground portion 7 is arranged to close to the corner where the fourth radiating segment 53 connects to the fifth radiating segment 54 . In further embodiment, the integrated multi-band antenna 100 includes a second mating circuit 8 which electronically connects the second feeding point 6 and the second ground portion 7 .

In this embodiment, the length from the second feeding point 6 to the free end of the sixth radiating segment 55 of the second radiating element 5 is a quarter of the wavelength corresponding to Wi-Fi5.2 GHz and the length from the second feeding point 6 to the free end of the second radiating segment 51 of the second radiating element 5 is a quarter of the wavelength corresponding to Wi-Fi2.4 GHz.

As shown in FIG. 2 and FIG. 3 . The first and second radiating elements 1 , 5 of the integrated multi-band antenna 100 are folded to fit a housing configured in an electrical device 200 . The electrical device 200 operates the integrated multi-band antenna 100 through a first cable 201 connected the first feeding point 2 and the first ground portion 3 , and a second cable 202 connected the second feeding point 6 and the second ground portion 7 . The first and second radiating elements 1 , 5 are substantially located on a first surface of the housing except the first and second feeding points 2 , 6 which are located on different surfaces of the housing for preventing first signal transmitting through the first cable 201 interfering with second signal transmitting through the second cable 202 .

In this case, the electrical device 200 is a notebook and the housing is configured in a display of the notebook. The first and second radiating elements 1 , 5 are substantially located on a top surface 203 of the display of the notebook 200 . The first feeding point 2 is located on a back surface 204 of the display of the notebook 200 . The second feeding point 6 is located on a front surface 205 of the display of the notebook 200 .

According to the position where the feeding conductor 16 connects the first radiating element 1 and designed the slot 14 , the first radiating element 1 has the low frequency band including GSM850 and EGSM900 bands, and the high frequency band including DCS1800, PCS1900 and W-CDMA2100 bands. Because the slot 14 obtains a high harmonic frequency partially overlapped the high frequency band, the bandwidth of the high frequency band of the first radiating element 1 can be enhanced.

According to the position where the second feeding point 6 arranged at the corner between the fourth radiating segment 53 and the fifth radiating segment 54 , the second radiating element 5 obtains Wi-Fi2.4 GHz and Wi-Fi5.2 GHz bands. According to the relation position between the first radiating element 2 and the second radiating element 3 , the integrated multi-band antenna 100 obtains a preferred pattern gain and a preferred high frequency bandwidth and low frequency bandwidth.

Furthermore, the present invention is not limited to the embodiments described above; various additions, alterations and the like may be made within the scope of the present invention by a person skilled in the art. For example, respective embodiments may be appropriately combined.