Patent Application
20250192432
The present disclosure relates to an antenna, and especially relates to an inverted F-shaped (PIFA) dual-band antenna structure that reduces the height of the antenna.
The development of the wireless communications in recent years has required wireless communication apparatuses (such as smartphones, tablets, laptops, and wireless access points) to not only provide basic communication functions, but also support message exchange, network connection, and other functions using multiple communication protocols. However, as mobile communication apparatuses become increasingly compact in size, how to design an antenna with small size and good radiation effect in a limited space is currently one of the directions of the industry's efforts.
However, in the development of the antenna structures, the application of the inverted F-shaped antenna is more common because of its advantages of simple structure, light weight, relatively low cost, and high radiation efficiency. However, the shape, structure and even size of the antenna structure will significantly affect the impedance matching, operating frequency band, radiation efficiency, and other aspects of the antenna structure.
A related art inverted F-shaped antenna structure 100 is shown in
Because the total height (length) of the signal transmission section (impedance-matching terminal) 102, the radiation terminal 103, and the signal feed-in terminal 104 of the related art inverted F-shaped antenna structure 100 is 10 mm or more than 10 mm, in many light, thin, and compact electronic apparatuses with the limited installation space (height) inside the apparatuses, the related art inverted F-shaped antenna structure 100 with the height of 10 mm or more than 10 mm cannot be arranged and used inside the electronic apparatus.
Therefore, how to enable the related art inverted F-shaped antenna structure 100 to be arranged and used inside a light, thin, and compact electronic apparatus is a problem to be solved by the present disclosure.
Therefore, the main object of the present disclosure is to solve the traditional deficiencies. The present disclosure redesigns the inverted F-shaped antenna structure, and shortens the length of the impedance-matching terminal, and increases the area of the radiation terminal, and shortens the distance between the ground terminal and the radiation terminal, and allows the inverted F-shaped antenna structure to be arranged and used inside the electronic apparatus with the limited height and space.
In order to achieve the object mentioned above, the present disclosure provides a dual-band antenna structure which includes a ground terminal, an impedance-matching terminal, a radiation terminal, and a signal feed-in terminal. The ground terminal includes a body. The impedance-matching terminal is bent and extended from one side of the body, and is connected perpendicularly to the body. The radiation terminal is G-shaped, and includes a low-frequency radiation terminal and a high-frequency radiation terminal, and is bent and extended from one side of the impedance-matching terminal, and is connected perpendicularly to the impedance-matching terminal, and is arranged correspondingly with (namely, opposite to, or mapping to) the body. The signal feed-in terminal is bent and extended from one side of the high-frequency radiation terminal, and is connected perpendicularly to the high-frequency radiation terminal, and is also connected to the impedance-matching terminal on a same side, and fails to be connected to the ground terminal.
In one embodiment of the present disclosure, the body is a rectangular body; the ground terminal further includes two lugs; the two lugs extend respectively from two ends of the body; each of the two lugs defines a perforation; the ground terminal is fixed and connected to a metal sheet through the two perforations.
In one embodiment of the present disclosure, the low-frequency radiation terminal of the radiation terminal is L-shaped and is connected to the impedance-matching terminal; the high-frequency radiation terminal extends from one side of a connection between the low-frequency radiation terminal and the impedance-matching terminal.
In one embodiment of the present disclosure, the low-frequency radiation terminal and the high-frequency radiation terminal define a plurality of through holes; the radiation terminal defines a slot between the low-frequency radiation terminal and the high-frequency radiation terminal.
In one embodiment of the present disclosure, a frequency of a signal of the low-frequency radiation terminal is 2.4 GHz; an operating frequency range of the signal of the low-frequency radiation terminal is 2400 MHz to 2500 MHz.
In one embodiment of the present disclosure, a frequency of a signal of the high-frequency radiation terminal is 5 GHz; an operating frequency range of the signal of the high-frequency radiation terminal is 5150 MHz to 5850 MHz.
In one embodiment of the present disclosure, a corresponding distance between the radiation terminal and the ground terminal is about 1 mm to 9 mm.
In one embodiment of the present disclosure, the corresponding distance between the radiation terminal and the ground terminal is about 6 mm.
In one embodiment of the present disclosure, the signal feed-in terminal includes a first signal feed-in terminal; the first signal feed-in terminal is bent and extended from one side of the high-frequency radiation terminal, and is connected perpendicularly to the high-frequency radiation terminal, and is connected to the impedance-matching terminal on the same side, and fails to be connected to the ground terminal; the signal feed-in terminal defines a gap between one side of the first signal feed-in terminal and the impedance-matching terminal, and further defines a notch at the other side of the first signal feed-in terminal.
In one embodiment of the present disclosure, the signal feed-in terminal further includes a second signal feed-in terminal; the second signal feed-in terminal is bent and extended from one side of the body, and is connected perpendicularly to the body, and is located in the notch at the first signal feed-in terminal.
The technical content and detailed description of the present disclosure are now explained with the figures as follows:
The ground terminal 1 includes a body 11 and two lugs 12. The two lugs 12 extend respectively from two ends of the body 11. Each of the two lugs 12 defines a perforation 13, so there are two perforations 13. The ground terminal 1 is fixed and connected inside the electronic apparatus or to a metal sheet (not shown in
The impedance-matching terminal (signal transmission section) 2 is bent and extended from one side of the body 11 of the ground terminal 1, and is connected perpendicularly to the body 11. The purpose of the impedance-matching terminal 2 is to eliminate the reactance part of the antenna input impedance and to make the resistance part as close as possible to the characteristic impedance of the signal feed-in terminal 4.
The radiation terminal 3 is G-shaped, and is bent and extended from one side of the impedance-matching terminal 2, and is connected perpendicularly to the impedance-matching terminal 2, so that the radiation terminal 3 and the body 11 of the ground terminal 1 are arranged correspondingly. The radiation terminal 3 includes a low-frequency radiation terminal 31 which is L-shaped and connected to the impedance-matching terminal 2. The radiation terminal 3 further includes a high-frequency radiation terminal 32 extending from one side of a connection between the low-frequency radiation terminal 31 and the impedance-matching terminal 2. The low-frequency radiation terminal 31 and the high-frequency radiation terminal 32 define a plurality of through holes 33. The radiation terminal 3 defines a slot 34 between the low-frequency radiation terminal 31 and the high-frequency radiation terminal 32.
It is worth mentioning that the radiation terminal 3 is dual-band. A frequency of a signal of the low-frequency radiation terminal 31 is 2.4 GHz. An operating frequency range of the signal of the low-frequency radiation terminal 31 is 2400 MHz to 2500 MHz. A frequency of a signal of the high-frequency radiation terminal 32 is 5 GHz. An operating frequency range of the signal of the high-frequency radiation terminal 32 is 5150 MHz to 5850 MHz. A corresponding distance between the radiation terminal 3 and the ground terminal 1 is about 1 mm to 9 mm. The corresponding distance D between the radiation terminal 3 and the ground terminal 1 is about 6 mm. A length of the impedance-matching terminal 2 is shortened to increase the area of the radiation terminal 3 to reduce the height of the antenna, so that the inverted F-shaped dual-band antenna structure 10 may be arranged and used inside the electronic apparatus with limited height and space.
The signal feed-in terminal 4 includes a first signal feed-in terminal 41 and a second signal feed-in terminal 42. The first signal feed-in terminal 41 is bent and extended from one side of the high-frequency radiation terminal 32, and is connected perpendicularly to the high-frequency radiation terminal 32, and is also connected to the impedance-matching terminal 2 on a same side, and fails to be connected to the ground terminal 1. The signal feed-in terminal 4 defines a gap 40 between one side of the first signal feed-in terminal 41 and the impedance-matching terminal 2, and further defines a notch 411 at the other side of the first signal feed-in terminal 41. The second signal feed-in terminal 42 is bent and extended from one side of the body 11 of the ground terminal 1, and is connected perpendicularly to the body 11, and is located in the notch 411 at the first signal feed-in terminal 41.
A high-frequency signal (voltage) on a transmission path is transmitted from the cable 20 to the signal feed-in terminal 4, and then transmitted from the signal feed-in terminal 4 to the high-frequency radiation terminal 32. The low-frequency signal (voltage) on a transmission path is transmitted from the cable 20 to the signal feed-in terminal 4, and then transmitted from the signal feed-in terminal 4 to the low-frequency radiation terminal 31. A ground signal is transmitted to the ground terminal 1 through the impedance-matching terminal 2.
It may be seen from the above content that when the signal feed-in terminal 4 inputs a voltage with a corresponding frequency, for example, 2.4 GHz, the voltage may be radiated through the low-frequency radiation terminal 31; and for example, 5 GHz, the voltage may be radiated through the high-frequency radiation terminal 32. On the contrary, when receiving the electromagnetic wave with the same frequency, the electromagnetic wave with the corresponding frequency is received in a reverse manner through the low-frequency radiation terminal 31 or the high-frequency radiation terminal 32, and is induced as a voltage input.
However, the above descriptions are only embodiments of the present disclosure and are not intended to limit the scope of the claims of the present disclosure. Therefore, any equivalent changes made by using the contents of the specifications or drawings of the present disclosure are also included in the claims of the present disclosure, which is stated here clearly.
