CN1917283B - Planar inverted F shaped antenna, and method for adjusting input impedance - Google Patents

Abstract

An antenna device includes an antenna made of sheet metal, a casing and a coaxial cable, the antenna includes a radiation part, a ground part and an impedance matching part with an impedance matching space; the coaxial cable includes a The inner core and the braided layer conductor connected to the ground part; wherein the antenna device also includes a metal foil located in the impedance matching space and connected to the impedance matching part to adjust the input impedance of the antenna. A method for adjusting the input impedance of an antenna in the present invention includes: first step: selecting the aforementioned antenna and casing used inside the notebook computer; second step: pasting a metal foil in a certain area inside the casing, so that when the antenna is assembled into the casing, , this area corresponds to the impedance matching space of the antenna; Step 3: assemble the antenna into the casing so that the metal foil contacts the impedance matching part of the antenna. The adjustment method of the antenna input impedance of the present invention does not need to change the existing antenna mold, which not only reduces the complexity of the mold but also reduces the certification cost of the antenna.

Description

Planar Inverted-F Antenna and Its Input Impedance Adjustment Method

【Technical field】

The invention relates to an antenna, in particular to a planar inverted-F antenna used in electronic equipment and an input impedance adjustment method thereof.

【Background technique】

With the increasing popularity of products with wireless transmission capabilities, it is very convenient for users to transmit data wirelessly without being restricted by the environment.

Portable electronic devices such as notebook computers often utilize antennas for wireless data transmission. However, the antenna is greatly affected by its environment in the whole system, so the functionality of the antenna with the same structure in different notebook computers will also be greatly affected by the different background conditions. Therefore, in different notebook computers, the antenna design with the same excitation principle must be fine-tuned to have normal functions.

For stamped metal antennas, the traditional correction method is to change the length and width of the radiation part of the antenna, or to modify the impedance matching part of the antenna in a small range. However, this method will increase the complexity of the mold and increase the cost of antenna certification.

【Content of invention】

The object of the present invention is to provide an antenna whose input impedance can be adjusted without changing the antenna mold.

Another object of the present invention is to provide an antenna device capable of adjusting the input impedance of the antenna.

Another object of the present invention is to provide a method for adjusting the antenna input impedance of the above-mentioned antenna device.

In order to achieve the above object, a planar inverted F-type antenna of the present invention includes a radiation part made of a metal sheet, a ground part and an impedance matching part with an impedance matching space, and the impedance matching part connects the radiation part and the ground part, The coaxial cable includes an inner core connected to the radiation part or the impedance matching part and a braided layer conductor connected to the ground part, wherein the planar inverted-F antenna further includes a metal foil located in the impedance matching space and connected to the impedance matching part.

The antenna device of the present invention includes an antenna made of metal sheets, a shell and a coaxial cable, the antenna includes a radiation part, a ground part and an impedance matching part; the coaxial cable includes a The inner core and the braided layer conductor connected to the grounding part; wherein the antenna device also includes a metal foil attached to the shell and connected to the impedance matching part.

A method for adjusting the input impedance of an antenna in the present invention comprises: the first step: selecting the aforementioned antenna and casing used inside the notebook computer; the second step: pasting a metal foil in a certain area inside the casing so that when the antenna is assembled to the casing Finally, this area corresponds to the impedance matching space of the antenna; Step 3: assemble the antenna into the casing so that the metal foil contacts the impedance matching part of the antenna.

Compared with the prior art, the adjustment method of the antenna input impedance of the present invention does not need to change the existing antenna mold, but only needs to add a piece of metal foil in the impedance matching area of the antenna. Since the input impedance of the antenna is changed by the inductance effect, the situation that a single antenna can work on various notebook computers can be realized. This not only reduces the complexity of the mold but also reduces the certification cost of the antenna.

【Description of drawings】

FIG. 1 is a perspective view of a conventional planar inverted-F antenna used inside a notebook computer.

Fig. 2 is a perspective view of the first embodiment of the present invention where the aluminum foil is pasted on the casing.

Fig. 3 is a perspective view of the planar inverted-F antenna assembled on the housing according to the first embodiment of the present invention.

【Detailed ways】

FIG. 1 shows an existing planar inverted-F antenna 1 used inside a notebook computer. The planar inverted F-shaped antenna 1 is integrally formed by a bracket connecting the liquid crystal display screen inside the notebook computer with the casing or an independent metal sheet with a slot (not labeled). The above-mentioned bracket is a metal sheet. Referring to FIG. 1 , FIG. 2 and FIG. 3 , the planar inverted-F antenna 1 includes a radiation part 2 , a ground part 5 , a coaxial cable 4 and an impedance matching part 3 connecting the radiation part 2 and the ground part 5 .

The radiating part 2 is in the shape of a longitudinal strip, and includes a first radiating unit 20 , a second radiating unit 21 and a third radiating unit 22 that are located in the same longitudinal direction as the first radiating unit 20 and extend toward the other end. The third radiating unit 22 is connected to the intersection of the first radiating unit 20 and the second radiating unit 21 through a vertical bar. The impedance matching part 3 includes a first connecting arm 30 , a third connecting arm 32 and a second connecting arm 31 connecting the first connecting arm 30 and the third connecting arm 32 . The above connecting arms enclose an impedance matching space 8 . The impedance matching part 3 has an inverted "ㄈ" structure. In addition, the radiating part 2 and the first connecting arm 30 form an "E" structure.

The grounding portion 5 extends horizontally from inside to outside along the second and third connecting arms 31 and 32 . The ground part 5 is perpendicular to the radiation part 2 and the impedance matching part 3 .

The coaxial cable 4 includes an inner core 40 and a braided conductor 41 . The inner core 40 is electrically connected to the radiation portion 2 , and the braided layer conductor 41 is electrically connected to the ground portion 5 . The feed point 9 is formed at the intersection of the third radiating unit 22 and the first connecting arm 30 of the impedance matching part 3 , and the inner core 40 and the radiating part 2 are connected at the feed point 9 .

The first radiating unit 20, the third radiating unit 22, the impedance matching part 3, the grounding part 5 and the coaxial cable 4 constitute the first planar inverted F antenna, which is used to receive or transmit higher frequency signals (4.9-5.35GHz , 5.47-5.875GHz). The second radiating unit 21 , the impedance matching part 3 , the grounding part 5 and the coaxial cable 4 constitute a second planar inverted-F antenna for receiving or transmitting lower frequency signals (2.4-2.5 GHz).

A piece of metal foil, which is aluminum foil 7 in this embodiment, is pasted in a certain area inside the shell 6 of the planar inverted-F antenna 1 . Of course, other metal foils such as copper foil may also be used in other embodiments. After the planar inverted-F antenna 1 is assembled into the housing 6 , the aluminum foil 7 is in contact with the impedance matching part 3 of the planar inverted-F antenna 1 . In addition, the above-mentioned area corresponds to the impedance matching space 8 .

In another embodiment of the present invention, the aluminum foil 7 can be connected to the impedance matching part 3 of the planar inverted-F antenna 1 by means of conductive glue or welding to adjust the input impedance of the antenna.

A method for adjusting the antenna input impedance of the present invention includes: the first step: selecting a planar inverted-F antenna 1 and a casing 6 used in a notebook computer, and the planar inverted-F antenna 1 includes a metal sheet The radiating part 2, the grounding part 5 and the impedance matching part 3 with an impedance matching space 8; the second step: paste a metal foil 7 in a certain area inside the shell 6, so that when the antenna 1 is assembled into the shell 6, the area Corresponding to the impedance matching space 8 of the antenna; the third step: assembling the antenna 1 into the casing 6 so that the metal foil 7 is in contact with the antenna impedance matching part 3 .

Claims (6)

1. A planar inverted F-type antenna, comprising a radiation part, a ground part and an impedance matching part made of a sheet metal body, the impedance matching part connects the radiation part and the ground part, and the coaxial cable includes a radiation part or an impedance matching part The inner core connected with the part and the braided layer conductor electrically connected with the ground part; it is characterized in that: the planar inverted F-type antenna also includes a metal foil which is independently arranged and is in contact with the impedance matching part to adjust the input impedance of the antenna; the impedance The matching part includes a first connecting arm, a second connecting arm and a third connecting arm, the connecting arms enclose an impedance matching space, and the metal foil is arranged in the impedance matching space. 2. The planar inverted-F antenna according to claim 1, wherein the metal foil is aluminum foil or copper foil. 3. The planar inverted-F antenna according to claim 1, characterized in that: the radiating part comprises a first radiating unit and a second radiating unit positioned in the same longitudinal direction, and the impedance matching part passes through a vertical The bar is connected to the intersection of the first and second radiating units, and the radiating part also includes a third radiating unit connected to the impedance matching part, and the third radiating unit is connected to the first and second radiating units through the aforementioned vertical bar The aforementioned intersection points are connected. 4. The planar inverted-F antenna according to claim 1, wherein the inner core of the coaxial cable is welded at the intersection of the radiation part and the impedance matching part. 5. The planar inverted-F antenna according to claim 1, further comprising a housing for fixing the antenna, and the metal foil is attached to the housing. 6. A method for adjusting the input impedance of a planar inverted-F antenna, characterized in that: it comprises the following steps: the first step, selecting a planar inverted-F antenna and casing used in a notebook computer, said planar inverted-F The type antenna includes a radiating part made of a metal sheet, a grounding part, and an impedance matching part with an impedance matching space; the second step is to paste a metal foil in a certain area inside the casing, so that when the antenna is assembled into the casing, the area It corresponds to the impedance matching space of the antenna; in the third step, the antenna is assembled into the casing so that the metal foil contacts the impedance matching part of the antenna.