CN103531893B - Monopole Broadband Antenna Structure - Google Patents

Abstract

A monopole broadband antenna structure comprising: an antenna area, the antenna area includes an independent radiation main body and an independent frequency band width adjusting area, the radiation main body includes a first extension end, a second extension end and a feed-in signal end, the first extension end forms a first impedance matching adjusting area along a first direction; the second extending end is connected with the first extending end and forms a main radiating area along a second direction; the feed-in signal end is connected with the joint of the two extending ends and extends along a third direction; the band bandwidth adjusting area is arranged between the areas formed by the two extending ends; a grounding area adjacent to the feed-in signal end; and a second impedance matching adjustment region for adjusting the area increase or decrease between the grounding region and the adjacent antenna region. The wall-mounted monopole broadband antenna has the advantages of large broadband, suitability for various electronic products, direct printing and forming on a circuit board, low cost and light volume.

Description

Monopole Broadband Antenna Structure

technical field

The invention relates to a monopole broadband antenna structure, in particular to a printed wall-mounted monopole broadband antenna.

Background technique

In today's era of rapid technological development, electronic products require antennas of various lightweight sizes. For example, the applied electronic products may include: mobile phones, notebook computers or external wireless transmission devices (wireless network base stations (Access Point , AP) or wireless network card (Card Bus)), in general, planar inverted F antenna (Planar Inverse-F Antenna, PIFA) or monopole antenna (Monopole Antenna) two types of antenna, with light structure and transmission The characteristics of excellent performance have been widely used in handheld electronic products. In the existing traditional two antennas, 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 plane inverted F-shaped antenna, and then the transmission signal is transmitted through the plane. The inverted-F antenna output. The monopole antenna is also an earlier antenna structure that still exists in the general commercially available handheld electronic products.

An existing wide-band antenna is disclosed in Taiwan Patent No. TW 200824289. The structure of the antenna is unstable, which has the problems of easy toppling and high technical difficulty in production, and the antenna needs an antenna fixing structure to fix it when it is installed in an electronic product. , thus increasing production costs.

The other two existing wide-band antennas are disclosed in Taiwan Patent Nos. TW M260011 and TW M325616. The two external antennas are designed to respond to the electronic wireless bandwidth section and adopt a larger antenna structure. Therefore, it undoubtedly increases the inconvenience in use.

Contents of the invention

The purpose of the present invention is to provide a monopole broadband antenna structure, which is to provide an easily adjustable wall-mounted monopole broadband antenna.

Another object of the present invention is to provide a monopole broadband antenna structure. The operating frequency band of the monopole broadband antenna of the present application can be applied to the fourth-generation mobile communication standard Long Term Evolution Technology (Long Term) through simple adjustment and correction. Evolution, LTE), WiFi (802.11a), Ultra Wideband UWB (UltraWideband) and Worldwide Interoperability for Microwave Access (WiMAX) related electronic product communication frequency bands.

For reaching above-mentioned object, the present invention is a kind of monopole broadband antenna structure, and it is made on a printed circuit board, comprises:

An antenna area, the antenna area includes an independent radiation body and an independent frequency bandwidth adjustment area, the radiation body includes a first extension end, a second extension end and a feed signal end, wherein the first extension The end forms a first impedance matching adjustment area along the first direction; the second extension end joins the first extension end and forms a main radiation area along the second direction; the feed signal end is connected to the junction of the two extension ends And extend along the third direction; the frequency band bandwidth adjustment area is set between the areas sandwiched by the two extension ends;

a grounding area adjacent to the feed-in signal terminal; and

A second impedance matching adjustment area is adjusted by increasing or decreasing the area between the ground area and the adjacent antenna area.

Preferably, the feed-in signal terminal is further connected to a resistor, and the resistance of the resistor is 50Ω.

Preferably, the shape of the radiation body is close to a "Y" shape.

Preferably, the operating frequency band of the monopole broadband antenna structure is 4GHz to 7GHz.

Preferably, the shape of the frequency bandwidth adjustment area is close to that of a triangular island block, and one of the top corners is adjacent to the second extension end.

Preferably, the radiation body is formed by a microstrip line.

Preferably, the radiating body extends to a predetermined resonance length, and the length of the second extension end is equal to a quarter of the frequency resonance of the designed frequency band.

Preferably, the portion of the second extension end gradually widens toward the second direction.

Preferably, the first extending end has at least one bend.

Preferably, the printed circuit board is formed by a dielectric substrate.

The monopole broadband antenna structure of the present invention is a wall-mounted monopole broadband antenna that can be easily adjusted. It has the advantage of large bandwidth, so it can be applied to various electronic products. The monopole broadband antenna of the present application is directly printed and formed on the circuit board, and has the advantages of low cost and light volume.

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

Fig. 1 is the front view structural diagram of monopole broadband antenna of the present invention;

Fig. 2 is the three-dimensional structural diagram of the monopole broadband antenna of the present invention;

3A-C are schematic diagrams of the frequency width adjustment of the monopole broadband antenna of the present invention using the first and second impedance matching adjustment areas and the frequency band bandwidth adjustment area of the grounding area;

Fig. 4 is a graph of voltage standing wave ratio and frequency of the monopole broadband antenna of the present invention.

Among them, reference signs:

1～printed circuit board

11～antenna area

111 ~ radiation subject

1111～Second extension end

1112～the first extension end

1113～feed signal terminal

112～Band bandwidth adjustment area

12～Touch area

121 ~ the second impedance matching adjustment area

Detailed ways

The detailed structure and connection relationship of the present invention are described in conjunction with the following drawings.

Please refer to Fig. 1 to Fig. 2, which are the structural diagrams of the monopole broadband antenna of the present invention, which are made on a printed circuit board 1, and the printed circuit board 1 is made of a dielectric substrate, including: an antenna Area 11, the antenna area 11 includes an independent radiation body 111 and an independent frequency band bandwidth adjustment area 112, the radiation body 111 includes a first extension end 1112, a second extension end 1111 and a feed signal end 1113 , the shape of the radiation body 111 is close to a "Y" shape, wherein the first extension end 1112 forms a first impedance matching adjustment area along the first direction, and the first extension end 1112 has at least one bend; the second extension end 1112 The extension end joins with the first extension end 1112 and forms a main radiation area along the second direction, and the part of the second extension end 1111 gradually widens toward the second direction; the feed signal end 1113 and the two extension ends ( 1111, 1112) are connected at the junction and extend along the third direction. The feed-in signal terminal 1113 is further connected to a resistor (not shown in the figure), and the resistance value of the resistor is 50Ω. Of course, those skilled in the art can change the resistance value arbitrarily To adjust different frequency bandwidths; the above-mentioned frequency bandwidth adjustment area 112 is set between the areas sandwiched by the two extension ends (1111, 1112); a grounding area 12 is adjacent to the feed-in signal end 1113; A second impedance matching adjustment area (shown in FIG. 3A ) is adjusted by increasing or decreasing the area between the ground area 12 and the adjacent antenna area. The operating frequency band of the monopole broadband antenna structure is 4GHz to 7GHz.

Please refer to Figure 3 A to Figure 3 C, which are schematic diagrams of frequency width adjustment using the first and second impedance matching adjustment areas and frequency band bandwidth adjustment areas of the monopole broadband antenna of the present invention, wherein Figure 3 A is before adjustment antenna structure, wherein the first impedance matching adjustment area 1112 of the radiating body 111 can be widened (such as the dotted line area) to adjust the frequency bandwidth; at the same time, the second impedance matching adjustment area 121 outside the grounding area 12 ( Such as the dotted line area, modify the original three-step shape into a two-step shape) to fill in, and the adjustment structure shown in Figure 3B can be formed. By changing the first impedance matching adjustment area 1112 and the second impedance matching adjustment area 121, you can achieve The purpose of simply adjusting the bandwidth of the frequency band.

Based on the above, furthermore, Figure 3A is also used as the antenna structure before adjustment, wherein the frequency band and bandwidth adjustment area 112 of the triangular island-shaped block is removed to form an adjustment structure as shown in Figure 3C, which can also achieve simple The purpose of adjusting the bandwidth of the frequency band.

The above-mentioned wall-mounted monopole broadband antenna made on a printed circuit board 1, the monopole antenna is printed with a microstrip line (Microstrip Line) on one side of a dielectric substrate, and the microstrip line is a A ribbon wire is isolated from the ground plane by a dielectric, and its other side is in direct contact with the air. There is only one ground plane as a reference plane, and one end of it is used as a signal feed-in end. The other side of the dielectric substrate is not printed with a grounded metal surface at the position corresponding to the microstrip line, and the other side corresponding to the non-antenna position can be divided into a printed grounded metal surface (three-layer board) or a metal-free ( Two different structures of double-layer panels).

The radiating body 111 of the antenna area 11 uses one end as a signal feed-in end 1113, and the other end of the microstrip line extends in two different directions corresponding to positions outside the grounding area 12 to form the radiating body 111 of the antenna. , the radiating body 111 extends to a predetermined resonance length, and the length of the second extension 1111 is equal to a quarter of the frequency resonance of the designed frequency band, the radiating body 111 can be used as an antenna to radiate frequency band signals. The extension of the radiation body 111 in the other direction corresponds to adjusting the impedance matching of the antenna, so that the voltage standing wave ratio (VSWR) of the antenna can reach the standard. The shape of the frequency bandwidth adjustment area 112 is close to a triangular island block, and one of the top corners is adjacent to the second extension end 1111 for increasing the width of the applied frequency.

Please refer to Figure 4, which is a graph of the voltage standing wave ratio and frequency of the monopole broadband antenna of the present invention. When the maximum value of the voltage standing wave ratio (VSWR) is set to 2, it can be observed that between 4.2GHz and 7.3 The entire frequency band of GHz is below the maximum value of the voltage standing wave ratio (VSWR), which means that the antenna of this application has a full band effectively applicable to wireless communication, and fully complies with the requirements on Long Term Evolution (LTE), WiFi (802.11a), ultra-wideband UWB (Ultra Wideband) and Worldwide Interoperability for Microwave Access (WiMAX) communication frequency band standards for related electronic products.

Through the above-mentioned disclosure of Figures 1 to 4, it can be understood that the present invention is a monopole broadband antenna structure, the main purpose of which is to provide an easily adjustable wall-mounted monopole broadband antenna, which has the advantage of large bandwidth, so it can be Applicable to various electronic products, the monopole broadband antenna of the present application is directly printed and formed on the circuit board, which has the advantage of low cost.

In summary, the structural features and various embodiments of the present invention have been disclosed in detail, and it can be fully demonstrated that the present invention is highly progressive in terms of purpose and effect, has great industrial utilization value, and is currently the According to the spirit of the patent law, this invention fully meets the requirements of an invention patent.

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

Claims (9)

1. A monopole broadband antenna structure, which is made on a printed circuit board, is characterized in that, comprising: An antenna area, the antenna area includes an independent radiation body and an independent frequency bandwidth adjustment area, the radiation body includes a first extension end, a second extension end and a feed signal end, wherein the first extension The end forms a first impedance matching adjustment area along the first direction; the second extension end joins the first extension end and forms a main radiation area along the second direction; the feed signal end is connected to the junction of the two extension ends And extend along the third direction; the frequency band bandwidth adjustment area is set between the areas sandwiched by the two extension ends; a grounding area adjacent to the feed-in signal terminal; and A second impedance matching adjustment area, which is adjusted by increasing or decreasing the area between the ground area and the adjacent antenna area; The shape of the bandwidth adjustment area is close to a triangular island block, and a vertex is adjacent to the second extension end. 2 . The monopole broadband antenna structure according to claim 1 , wherein the feed-in signal end is further connected to a resistor, and the resistance value of the resistor is 50Ω. 3 . 3. The monopole broadband antenna structure according to claim 1, wherein the shape of the radiation body is close to a Y shape. 4 . The monopole broadband antenna structure according to claim 1 , wherein the operating frequency band of the monopole broadband antenna structure is 4 GHz to 7 GHz. 5. The monopole broadband antenna structure according to claim 1, wherein the radiation body is formed by a microstrip line. 6. The monopole broadband antenna structure according to claim 1, wherein the radiating body extends to a predetermined resonance length, and the length of the second extension end is equal to a quarter of the frequency resonance of the designed frequency band . 7. The monopole broadband antenna structure according to claim 1, wherein the printed circuit board is formed of a dielectric substrate. 8 . The monopole broadband antenna structure according to claim 1 , wherein the portion of the second extension end gradually becomes wider toward the second direction. 9 . The monopole broadband antenna structure according to claim 1 , wherein the first extension end has at least one bend.