Patent Application
20130127668
1. Field of the Invention
The present invention relates to a field of communication equipment, and in particular to a multi-band antenna which has a compact size to meet the requirement of various communication standards.
2. The Related Arts
With the development of communication industries of high technology, the application of mobile communication, especially 4G communication technologies, is widely used nowadays. Hence, a requirement of ranges of antenna frequency bands of mobile communication equipment, such as mobile phone and notebook computer, is higher day by day.
However, with the miniaturization trend of mobile communication, in particular to the miniaturization trend of mobile phone, the space for an internal antenna is limited. Because the use of the mobile equipment usually causes the antenna to produce resonance shift on account of different intensity, wherein the type of the resonance frequency shift must be compensated by bandwidth, namely, the actual bandwidth of the antenna needs to be larger than the designed bandwidth. However, the radiation area of antenna must be increased if the bandwidth increases, so that it is important for the technician to solve the problem of making a multi-band antenna in a limited space and to meet a requirement of various communication standards.
Therefore, this is a solution for providing a multi-band antenna which has a compact size and can meet the requirement of various communication standards.
To overcome the problem of traditional technology, the present invention provides a multi-band antenna which has a compact size to meet the requirement of various communication standards.
To achieve the above objective, the present invention provides a multi-band antenna used for receiving and transmitting electromagnetic wave signals of five different bands, and comprises a substrate and an electro-conductive layer formed on the substrate. The electro-conductive layer comprises: a feed-in terminal; a ground terminal; a connecting portion extended forward from the feed-in terminal; a first high frequency portion extended leftward from a rear end of the connecting portion for controlling a third frequency band; a low frequency portion bent and extended leftward from a front end of the connecting portion for controlling a first frequency band and a second frequency band; and a second high frequency portion extended rightward from the front end of the connecting portion for controlling a fourth frequency band. Furthermore, the second high frequency portion is connected with the ground terminal and wider than the first high frequency portion; and harmonic oscillations are generated between the second high frequency portion and the first high frequency portion to control a fifth frequency band.
In one embodiment of the present invention, the low frequency portion comprises: a first low frequency arm extended leftward from the front end of the connecting portion; a bent sheet bent and extended forward from the rear end of the first low frequency arm; a second low frequency arm extended rightward from the bent sheet; and a third low frequency arm bent and extended forward and then downward from a rear end of the bent sheet; wherein the first low frequency arm, the second low frequency arm and the third low frequency arm are parallel to each other; a first gap is formed between the first low frequency arm and the second low frequency arm; a second gap is formed between the first low frequency arm and the third low frequency arm; and the second high frequency portion is disposed outside the first gap and the second gap.
In one embodiment of the present invention, the second low frequency arm is extended from a middle part of a right side of the bent sheet.
In one embodiment of the present invention, a compensation arm is bent and extended downward and then leftward from a front end of the bent sheet.
In one embodiment of the present invention, the compensation arm is perpendicularly bent leftward and then bent toward the bent sheet, and a third gap is formed between the compensation arm and the second low frequency arm.
In one embodiment of the present invention, the frequency range of the first frequency band is between 824 and 894 MHz; the frequency range of the second frequency band is between 880 and 960 MHz; the frequency range of the third frequency band is between 1710 and 1880 MHz; the frequency range of the forth frequency band is between 1850 and 1990 MHz; and the frequency range of the fifth frequency band is between 1920 and 2170 MHz.
As above mentioned, in the present invention, the harmonic oscillations/resonances are generated between the first high frequency portion and the second high frequency portion to control the fifth frequency band, so that the bandwidth of high frequency in the multi-band antenna is broadened, and the multi-band antenna can meet the requirement of various communication standards.
The present invention will be apparent to those skilled in the art by reading the following description of a preferred embodiment of the present invention, with reference to the attached drawings, in which:
The foregoing objects, features and advantages adopted by the present invention can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings.
Referring now to
To continue Referring to
Moreover, the frequency range of the first frequency band is between 824 and 894 MHz; the frequency range of the second frequency band is between 880 and 960 MHz; the frequency range of the third frequency band is between 1710 and 1880 MHz; the frequency range of the forth frequency band is between 1850 and 1990 MHz; and the frequency range of the fifth frequency band is between 1920 and 2170 MHz.
Specifically, to continue Referring to
Specifically, to continue Referring to
Furthermore, the first high frequency portion 21 is 2 mm in width and 11.9 mm in length; the second high frequency portion 22 is 10 mm in width and 11.5 mm in length; the first low frequency arm 31 is 30 mm in length and 2.5 mm in width; the second low frequency arm 32 is 15.3 mm in length and 2 mm in width; the third low frequency arm 33 is 13.7 mm in length and 2.6 mm in width; the first gap 41 is 2.55 mm in width; and the compensation arm 35 is 11.8 mm in length and 2.4 mm in width.
Referring now to
As above mentioned, in the present invention, the resonance is produced between the first high frequency portion 21 and the second high frequency portion 22, and controls the fifth frequency band, so that the multi-band antenna can broaden the bandwidth of high frequency, and to meet the requirement of various communication standards.
Although the present invention has been described with reference to the preferred embodiment thereof, it is apparent to those skilled in the art that a variety of modifications and changes may be made without departing from the scope of the present invention which is intended to be defined by the appended claims.
