CN103855465B - monopole antenna - Google Patents

Abstract

The present invention discloses a monopole antenna, comprising: an antenna body, the antenna body comprising a first radiating portion and a second radiating portion, the second radiating portion having a signal feeding end, the first radiating portion extending in a first direction and a second direction respectively and having a first length and a first width, the first direction being perpendicular to the second direction, the first radiating portion and the second radiating portion being adjacent to each other along the first direction; a dielectric portion adjacent to the antenna body; and a grounding portion adjacent to the dielectric portion, the dielectric portion isolating the antenna body from the grounding portion; wherein the first length and the first width of the first radiating portion are respectively adjusted to adjust the operating frequency and bandwidth of the antenna body, and the shape and size of the second radiating portion are adjusted to adjust the impedance matching of the antenna body.

Description

monopole antenna

technical field

The invention relates to a monopole antenna, in particular to a single-frequency monopole antenna made by printing technology.

Background technique

Nowadays, wireless transmission products (such as mobile phones, notebook computers, wireless network cards, etc.) all need to be equipped with antennas for transmission and reception. The use of antennas in general wireless transmission devices often depends on the size, characteristics and cost of the space. Antennas used in currently used wireless transmission devices can be classified into single-frequency, dual-frequency, multi-frequency, and broadband antennas according to different frequencies. In addition, according to the structure, it can be divided into two categories, one is the chip antenna, and the other is the printed antenna. Among them, the chip antenna has the characteristics of small required area, high cost and narrow bandwidth. According to the structure, the printed antenna is divided into monopole antenna, double dipole antenna, planar inverted F antenna and loop antenna, etc., which are characterized by large area required, low cost and wide bandwidth, which is just the opposite of chip antenna. . For example, a planar inverted-F antenna (planarinverse-Fantenna, hereinafter referred to as PIFA) or a monopole antenna (monopole antenna) that has a light structure, good transmission performance, and can be easily installed on the inner wall of a handheld electronic device already exists and is widely used in multiple applications. In the wireless transmission of a handheld electronic device, a notebook computer or a wireless communication device.

In the conventional technology, the inner conductor layer and the outer conductor layer of the coaxial cable are mostly welded to the signal feeding point and the signal grounding point of the PIFA respectively, so as to output the signal to be transmitted through the PIFA. However, the bandwidth of the PIFA antenna is relatively narrow, and fine-tuning of the frequency band is required for different environments. The monopole antenna is one of the most traditional and classic antenna designs, as shown in Figure 1. The traditional monopole antenna 1 shown in FIG. 1 must have a support portion 11 joined to a substrate 12 to support and fix the monopole antenna 1, and the monopole antenna 1 is likely to fall up, down, left, and right, which is not easy Fixed, and difficult to produce, increasing production costs.

Therefore, in view of the aforementioned problems, it is urgent to propose a novel monopole antenna that can be easily adjusted to meet the requirements of the device and save costs.

Contents of the invention

One of the objectives of the present invention is to provide a monopole antenna, which can be adjusted according to different environments, so as to achieve multi-system commonality and effectively save costs.

Another object of the present invention is to provide a monopole antenna, which can be printed on a circuit board, so as to reduce the mold cost and production assembly cost of the three-dimensional antenna.

A monopole antenna provided by the present invention includes: an antenna body, and the antenna body includes a first radiating part and a second radiating part, the second radiating part has a feed-in signal end, and the first radiating part The portion extends to a first direction with a first length, the first radiating portion extends to a second direction with a first width, the first direction is perpendicular to the second direction, and the first radiating portion and the The second radiating part is adjacent to the first direction; a dielectric part is adjacent to the antenna body; and a ground part is adjacent to the dielectric part, and the dielectric part isolates the antenna body and the ground part; wherein, adjusting the first The first length of a radiating part further adjusts the operating frequency of the antenna body, adjusts the first width of the first radiating part and then adjusts the operating bandwidth of the antenna body, adjusts the shape and size of the second radiating part and then adjusts the Impedance matching of the antenna body.

Preferably, the first radiating portion is a rectangular radiating portion, and the length of the first radiating portion is approximately equal to a quarter of the resonant wavelength of the frequency used in the frequency band to be operated.

Preferably, the antenna body includes four sides, three of which are adjacent to the dielectric portion, and the ground portion is adjacent to the dielectric portion in a manner corresponding to the arrangement of the above three sides.

Preferably, the second radiating portion extends toward the first direction with a second length, the second radiating portion extends toward the second direction with a second width, the first length is greater than the second length, and the second radiating portion extends toward the second direction with a second width. A width is greater than the second width.

Preferably, the impedance matching of the antenna body is further adjusted by adjusting the second length and/or the second width.

Preferably, the impedance matching of the antenna body is adjusted by adjusting a first distance between the first radiation portion and the ground portion along a first direction.

Preferably, the impedance matching of the antenna body is adjusted by adjusting a second distance between the second radiation portion and the ground portion along the first direction.

Preferably, the second distance is greater than the first distance.

Preferably, the second radiating part is an inverted F-shaped radiating part, and the shape and size of the inverted F-shaped radiating part can be adjusted to further adjust the impedance matching of the antenna body.

Preferably, the second radiating portion is an inverted F-shaped radiating portion, and further includes a first extension portion and a second extension portion extending toward the ground portion along the second direction, wherein the first extension portion is located at the second The end of the radiating part, the second extending part is located between the first extending part and the first radiating part, by adjusting the size of the first extending part and/or the second extending part, and then adjusting the size of the antenna body Impedance matching.

Preferably, a first slot is formed between the first extension and the second extension, and a second slot is formed between the second extension and the first radiating portion, by adjusting the first slot and/or Or the size of the second slot, and then adjust the impedance matching of the antenna body.

Preferably, the second extension part further includes the feed signal end, which is used for receiving the feed signal of the monopole antenna.

Preferably, it also includes a printed circuit board, which includes a corresponding first surface and a second surface, the antenna body, the dielectric portion and the ground portion are co-located on the first surface, and the antenna body is projected on The area of the second surface is free of any circuits or components.

Preferably, the antenna body is disposed adjacent to any edge of the printed circuit board.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

Figure 1 shows a conventional monopole antenna;

FIG. 2 shows a monopole antenna according to an embodiment of the present invention.

Among them, reference signs

1 monopole antenna

11 support part

12 Substrates

2 printed circuit boards

2a first surface

2b second surface

21 antenna body

22 Media Department

23 ground part

211 First Radiant Department

212 Second Radiant Department

212a first extension

212b second extension

L1, L2 length

D1, D2 distance

W1, W2 width

H1, H2 Slots

F1 feeds into the signal terminal

detailed description

Below in conjunction with accompanying drawing, structural principle and working principle of the present invention are specifically described:

In order to have a further understanding and understanding of the features, purposes and functions of the present invention, the relevant detailed structure and design concept of the device of the present invention will be described below, so that the features of the present invention are described in detail as follows:

FIG. 2 shows a monopole antenna according to an embodiment of the present invention, and the monopole antenna is arranged on a printed circuit board 2, and the printed circuit board 2 has a first surface 2a and a second surface corresponding to each other. 2b. The monopole antenna includes: an antenna body 21, a dielectric portion 22 and a ground portion 23, and the antenna body 21, the dielectric portion 22 and the ground portion 23 are jointly arranged on a first surface 2a of the printed circuit board 2 , and the projected area of the antenna body on the second surface 2b is not provided with any circuit or component. The antenna body 21 can be disposed adjacent to any edge of the printed circuit board 2 .

The antenna body 21 includes a first radiating portion 211 and a second radiating portion 212. The second radiating portion 212 has a feed-in signal terminal F1, and the first radiating portion 211 extends toward a first direction and has a first Length L1, the first radiating portion 211 extends toward a second direction, has a first width W1, the first direction is approximately perpendicular to the second direction, and the first radiating portion 211 and the second radiating portion 212 are adjacent along the first direction. Wherein, the first length L1 of the first radiation portion 211 can be adjusted to adjust the operating frequency of the antenna body 21, and the first width W1 of the first radiation portion 211 can be adjusted to adjust the operating bandwidth of the antenna body 21, Adjusting the shape and size of the second radiation portion 212 further adjusts the impedance matching of the antenna body 21 . Furthermore, the second radiating portion 212 extends toward the first direction with a second length L2, and the second radiating portion 212 extends toward the second direction with a second width W2. Therefore, the second length is adjusted L2 or the second width W2 can adjust the impedance matching of the antenna body 21 . In addition, in this embodiment, the first length L1 is greater than the second length L2, and the first width W1 is greater than the second width W2. In addition, the second radiating portion 212 can be an inverted F-shaped radiating portion, and the shape and size of the inverted F-shaped radiating portion can be adjusted to further adjust the impedance matching of the antenna body 21 .

The dielectric portion 22 is adjacent to the antenna body 21 , and the ground portion 23 is adjacent to the dielectric portion 22 , and the dielectric portion 22 isolates the antenna body 21 and the ground portion 23 . The first radiating portion 211 is an approximately rectangular structure, and a first distance D1 between the first radiating portion 211 and the ground portion 23 along the first direction is adjusted, and/or the distance along the first direction is adjusted. A second distance D2 between the second radiation part 212 and the ground part 23 is used to adjust the impedance matching of the antenna body, and the second distance D2 is greater than the first distance D1.

The second radiating portion 212 further includes a first extending portion 212a and a second extending portion 212b extending toward the ground portion 23 along the second direction, and the first extending portion 212a is located on the second radiating portion 212 At the end, the second extension part 212b is between the first extension part 212a and the first radiation part 211, by adjusting the size of the first extension part 212a and/or the second extension part 212b, and then adjusting the antenna body Impedance matching. And in this embodiment, the second extension portion 212b is longer than the first extension portion 212a, and its width is also wider than the first extension portion 212a. The second extension part 212b also includes the feed signal terminal F1, which is used to correspond to a feed signal point or couple to a transmission line (not shown), and the feed signal terminal F1 can be used to receive the feed signal of the monopole antenna. input signal.

A first slot H1 is formed between the first extension portion 212a and the second extension portion 212b, and a second slot H2 is formed between the second extension portion 212b and the first radiation portion 211. By adjusting the first slot hole The size of H1 and/or the second slot H2 further adjusts the impedance matching of the antenna body 21 .

In addition, the antenna body 21 includes four sides, three of which are adjacent to the dielectric portion 22 , and the ground portion 23 is adjacent to the dielectric portion 22 in a manner corresponding to the above-mentioned three sides. The aforementioned ground portion 23 is made of metal. The monopole antenna is a single-frequency monopole antenna, and the single-frequency monopole antenna is used in a wireless communication field, such as IEEE802.11a/b/c/g or single-frequency 5.15~5.85GHz.

In this embodiment, the printed circuit board 2 can be a dielectric substrate, one surface of the dielectric substrate is used to set the monopole antenna, and the surface is also provided with a grounded metal surface (three-layer board) or completely There is no metal (double-layer board), and the other surface of the dielectric substrate corresponds to the position of the microstrip line, and the ground metal plane is not printed. The second extension portion 212b of the antenna body 21 of the present invention can be used as a signal feed-in end, and the first extension portion 212a is extended corresponding to the ground portion 23 . And the first length L1 of the first radiating portion 211 of the antenna body 21 can be roughly equal to a quarter length of the frequency resonance wavelength used in the frequency band to be designed, so the first radiating portion 211 can be used as the monopole Antennas radiate frequency band signals. The second length L2 of the second radiating portion 212 can be adjusted to adjust the impedance matching of the monopole antenna, so that the voltage standing wave ratio (VSWR) of the antenna can meet industry standards and requirements. In addition, the monopole antenna of the present invention does not need another lower ground terminal like the PIFA antenna, so the size can be smaller than that of the PIFA antenna, and the monopole antenna signal feeding method of the present invention can be fed directly on the circuit board with a 50Ω transmission line. , avoiding the feed-in cost of using cables, as well as the mold cost and assembly cost of the three-dimensional antenna.

The built-in monopole antenna of the present invention is suitable for any wireless communication product, and can be easily adjusted and corrected to meet the needs of the product, and the present invention can also be applied to the operating frequency band of WiFi802.11a (5.15~5.85GHz) systems such as laptops, mobile phones, or TVs or DVDs that include WiFi, etc. The printed monopole antenna of the present invention, in addition to being shared by multiple systems, can also be printed directly on the circuit board, which can reduce the mold cost and production assembly cost of the three-dimensional antenna.

Of course, the present invention can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the present invention without departing from the spirit and essence of the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (10)

1. a unipole antenna, is characterized in that, comprising:

One antenna body, and this antenna body comprises one first Department of Radiation and one second Department of Radiation, this second Department of Radiation has a FD feed end, and this first Department of Radiation has one first length to a first direction extension, this first Department of Radiation has one first width to a second direction extension, this first direction is vertical with this second direction, and this first Department of Radiation and this second Department of Radiation adjoin along this first direction, this second Department of Radiation has one second length to the extension of this first direction, this second Department of Radiation has one second width to the extension of this second direction, and this first length is greater than this second length, this first width is greater than this second width,

One dielectric portion, is adjacent to this antenna body; And

One grounding parts, is adjacent to this dielectric portion, and this dielectric portion isolates this antenna body and this grounding parts;

Wherein, adjust this first length of this first Department of Radiation and then adjust the frequency of operation of this antenna body, adjust this first width of this first Department of Radiation and then adjust the operation frequency range of this antenna body, adjust the shape size of this second Department of Radiation and then adjust the impedance matching of this antenna body.

2. unipole antenna according to claim 1, it is characterized in that, this first Department of Radiation is an approximate rectangular structure, and adjustment is along one first distance between this first Department of Radiation and this grounding parts of this first direction, and/or adjustment is along the second distance between this second Department of Radiation and this grounding parts of first direction, and then adjust the impedance matching of this antenna body, and this second distance is greater than this first distance.

3. unipole antenna according to claim 1, is characterized in that, this second Department of Radiation is a reversed F-typed Department of Radiation, and adjusts the shape size of this reversed F-typed Department of Radiation, and then adjusts the impedance matching of this antenna body.

4. unipole antenna according to claim 1, it is characterized in that, this second Department of Radiation also comprises one first extension and one second extension that extend along second direction toward grounding parts, and this first extending part is in an end of this second Department of Radiation, second extending part is between this first extension and this first Department of Radiation, utilize the size of this first extension of adjustment and/or this second extension, and then adjust the impedance matching of this antenna body.

5. unipole antenna according to claim 4, is characterized in that, this second extension also comprises this FD feed end, and it is in order to receive the FD feed of this unipole antenna.

6. unipole antenna according to claim 4, it is characterized in that, one first slotted eye is formed between this first extension and second extension, one second slotted eye is formed between this second extension and this first Department of Radiation, utilize the size of this first slotted eye of adjustment and/or this second slotted eye, and then adjust the impedance matching of this antenna body.

7. unipole antenna according to claim 1, it is characterized in that, also comprise a printed circuit board (PCB) and a corresponding first surface thereof and a second surface, wherein this antenna body, this dielectric portion and this grounding parts are located at this first surface of this printed circuit board (PCB) jointly.

8. unipole antenna according to claim 7, is characterized in that, the region that this antenna body is projected on this second surface does not arrange any circuit or element.

9. unipole antenna according to claim 7, this antenna body is arranged at arbitrary edge of this printed circuit board (PCB) contiguous.

10. unipole antenna according to claim 1, is characterized in that, this unipole antenna is a single-frequency unipole antenna, and this single-frequency unipole antenna is used for a field of wireless communication.