WO2016198000A1

WO2016198000A1 - Antenna

Info

Publication number: WO2016198000A1
Application number: PCT/CN2016/086256
Authority: WO
Inventors: 赵晓平
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-10-27
Filing date: 2016-06-17
Publication date: 2016-12-15
Also published as: CN205122769U

Abstract

Disclosed is an antenna. The antenna comprises: a dielectric substrate, a radiation patch disposed on the front of the dielectric substrate and a ground plane disposed on the back of the dielectric substrate. The radiation patch is connected to a radio frequency (RF) line via a microstrip line. The ground plane has a circular gap formed thereon. A pair of parasitic stubs are formed at an inner edge of the circular gap and extend into the gap.

Description

Antenna

Technical field

This document relates to, but is not limited to, the field of antenna technology, and in particular to an antenna.

Background technique

Since the United States Federal Communications Commission (FCC) allocated the band 3.1-10.6 GHz to UWB in February 2002, the rapidly developing radio communication technology has attracted more and more attention and attention, but due to the dense spectrum of modern communications. Distribution, the UWB band has to face interference from other narrowband communication systems, such as global microwave interconnection (WiMAX: 3.3-3.6GHz) and infinite LAN (WLAN: 5.15-5.825GHz). Once the interference occurs, the communication system cannot Normal operation, communication quality will be seriously affected, using filters to suppress interference signals in the ultra-wideband frequency band is an effective method, but its drawback is that it will increase the size of the communication system, and does not meet the requirements of miniaturization of some systems, and The cost of hardware design will also increase greatly. Usually, it is a common method to slot the radiating patch or floor of the ultra-wideband antenna, but the process of slotting on the patch or the floor is relatively complicated and difficult to implement.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

Embodiments of the present invention provide an antenna that is simple in structure, easy to implement, and highly practical, and can effectively suppress a predetermined signal.

An embodiment of the present invention provides an antenna, including a dielectric substrate, a radiation patch disposed on a front surface of the dielectric substrate, and a floor disposed on a back surface of the dielectric substrate, wherein the radiation patch is connected to the RF line through a microstrip line, and the floor is A circular slit is opened, and a pair of parasitic branches extending to the inside of the slit are symmetrically formed at the edge of the circular slit.

Optionally, the parasitic branch pair includes: a first parasitic branch pair disposed to suppress a predetermined first signal; and a second parasitic branch pair configured to suppress a predetermined second signal, wherein the length of the first parasitic branch pair is greater than The length of the second parasitic branch pair.

Optionally, the first parasitic branch pair and the second parasitic branch pair are both L-shaped.

Optionally, the length of the first parasitic branch pair is one quarter of a wavelength corresponding to a center frequency of the first signal, and the length of the second parasitic branch pair is four wavelengths corresponding to a center frequency of the second signal. One of the points.

Optionally, the first signal is a global microwave interconnection access WiMAX signal, and the second signal is a wireless local area network WLAN signal.

Optionally, the first parasitic branch pair has a length of 9.2 mm, a width of 0.5 mm, a left-right symmetric spacing of 9 mm, a center-to-center spacing of the circular slit of 11.7 mm, and a length of the second parasitic branch pair. It is 7.8 mm, the width is 0.6 mm, the left-right symmetric spacing is 19 mm, and the center-to-center spacing of the circular slit is 12.8 mm.

Optionally, the circular slit has a radius of 14 mm.

Optionally, the radiation patch is a regular hexagon having a side length of 8.9 mm.

Optionally, the microstrip line has a width of 2.6 mm.

Optionally, the dielectric substrate is a substrate material having a dielectric constant of 4.4, a length of 40 mm, a width of 30 mm, a thickness of 1.4 mm, and a loss tangent of 0.02 and a flame resistance rating of FR4.

In an antenna according to an embodiment of the present invention, optionally, the parasitic branch pair may be only a pair of third parasitic branch pairs, and is configured to suppress a predetermined signal, and the length of the third parasitic branch pair is the predetermined signal. One quarter of the wavelength corresponding to the center frequency.

An embodiment of the above technical solution of the present invention is to open a circular slit on the floor of the back surface of the substrate, and to establish a parasitic branch pair on the circular slit. By adjusting the size of the parasitic branch, a stop band for the predetermined signal can be formed, which can be effectively realized. The suppression of the predetermined signal, and the structure is easy to implement, and the structure is also simple. It can be realized very easily by using a PCB process, that is, an electronic printing process. Alternatively, the logarithm of the parasitic branch pair can be increased or decreased to achieve Different predetermined signal suppression can be applied Different needs, strong applicability and high practicality.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

DRAWINGS

1 is a front elevational view of an antenna according to an embodiment of the present invention;

2 is a right side view of an antenna according to an embodiment of the present invention;

3 is a rear view of an antenna according to an embodiment of the present invention;

4 is a schematic diagram of an overall structure of an antenna according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a simulation curve of VSWR and frequency according to an embodiment of the present invention; FIG.

6 to FIG. 8 are schematic diagrams showing simulated radiation directions according to an embodiment of the present invention;

FIG. 9 is a schematic structural view of a pair of symmetric parasitic branches in an embodiment of the present invention. FIG.

[Main component symbol description]

1-radiation patch; 2-media substrate; 3-microstrip line; 4-floor; 5-first parasitic branch pair; 6-second parasitic branch pair; 7-circular slit; 8-third parasitic branch pair .

detailed description

The detailed description will be made below in conjunction with the accompanying drawings and specific embodiments.

The embodiments of the present invention provide an antenna that can effectively suppress interference of a predetermined signal, has a simple structure, is easy to implement, and has high practicability.

As shown in FIG. 1 to FIG. 4, the antenna includes a dielectric substrate 2, a radiation patch 1 disposed on the front surface of the dielectric substrate 2, and a floor 4 disposed on the back surface of the dielectric substrate 2. The radiation patch 1 is connected by a microstrip line 3. The RF line, wherein the microstrip line 3 and the RF line are connected by a 50 Ω SMA head, that is, the 50 Ω SMA head is connected to the microstrip line 3 at one end, and the other end is connected to the RF line, wherein the SMA head is an antenna RF connector, and the RF Lines are connected. The floor 4 is provided with a circular slit 7 in which an inner side of the circular slit 7 is formed with a bilaterally symmetrical, extending slit inside to prevent the predetermined signal from being parasitic. By forming a parasitic branch pair on the circular slit 7, a stop band for a predetermined signal is formed, which can effectively suppress the predetermined signal, and the structure is easy to implement and the structure is simple.

Optionally, the parasitic branch includes: a first parasitic branch pair 5 configured to suppress a predetermined first signal, and a second parasitic pair 6 disposed to suppress a predetermined second signal, wherein a center frequency of the first signal is less than The center frequency of the second signal, the length of the first parasitic branch pair 5 is greater than the length of the second parasitic branch pair 6.

Optionally, the length of the first parasitic branch pair 5 is one quarter of a wavelength corresponding to a center frequency of the first signal, and the length of the second parasitic branch pair 6 is a wavelength corresponding to a center frequency of the second signal. One quarter of the.

Optionally, the first parasitic branch pair 5 and the second parasitic branch pair 6 are both L-shaped (including one long side and one short side), and the length of the first parasitic branch pair 5 is The length of the long side of the parasitic branch is 9.2 mm, the width is 0.5 mm, and the distance between the left and right symmetry (ie, the distance between the ends of the short sides of the two symmetrical parasitic branches) is 9 mm, and the center of the circular slit 7 The spacing (ie, the distance between the center of the circle and the long side of the parasitic branch, the long side of the parasitic branch is usually an arc of a circle whose center of the circular slit 7 is its own center) 11.7 mm, and the second parasitic branch pair 6 The length (ie, the length of the long side of the parasitic branch) is 7.8 mm, the width is 0.6 mm, and the left-right symmetric spacing (ie, the distance between the ends of the short sides of the two symmetrical parasitic branches) is 19 mm, and the circular slit The center-to-center spacing of 7 (i.e., the distance between the center of the circle and the long side of the parasitic branch, the long side of the parasitic branch is usually an arc of a circle whose center of the circular slit 7 is its own center) 12.8 mm.

The radius of the circular slit 7 is 14 mm.

The radiation patch 1 is a regular hexagon having a side length of 8.9 mm.

The microstrip line 3 has a width of 2.6 mm.

The dielectric substrate 2 has a dielectric constant of 4.4, a length of 40 mm, a width of 30 mm, and a thickness. It is a substrate material with a flame-resistant grade of FR4 of 1.4mm and a loss tangent of 0.02. FR4 is a code name of a flame-resistant material grade. It means a material specification that the resin material must be self-extinguishing after being burned. It is not a Material name, but a material grade.

The effect of the antenna made by using the above data is to shield the interference of the WLAN and WIMAX signals; when shielding the interference of other predetermined signals, it is possible to change the value of each part of the data and/or increase or decrease the parasitic branch pair. The logarithmic method is selected, and the data selected by the experiment is confirmed by experiments or the like to better suppress the predetermined signal, and the interference of the predetermined signal is shielded; the implementation can be applied to different requirements, and has strong applicability and Very practical purpose.

Optionally, as shown in FIG. 9, the parasitic branch may further include only a pair of third parasitic branch pairs 8 arranged to suppress a predetermined signal, the length of the third parasitic branch pair 8 being the center of the predetermined signal One quarter of the wavelength corresponding to the frequency. Alternatively, the suppression of different predetermined signals may be achieved by increasing or decreasing the logarithm of the parasitic branch pairs, wherein, optionally, the length of the parasitic branch pairs involved satisfies the wavelength corresponding to the center frequency of the signal to be suppressed A quarter of the antennas designed in this manner can be adapted to different requirements, and have high applicability and high practicability. Optionally, the predetermined signals described in the embodiments of the present invention are relative. One or more of the narrowband signals in the case of ultra-wideband signals.

The final parameter combination is determined by adjusting the size of the branch. The antenna is simulated and optimized by the 3D electromagnetic simulation software Ansoft HFSS 13.0, and the relationship between the VSWR of the antenna, that is, the voltage standing wave ratio and the frequency is obtained, as shown in Fig. 5. For the antenna in the state where no parasitic branch pair is provided, the antenna in the state of the first parasitic branch pair 5 and the antenna in the state of the first parasitic branch pair 5 and the second parasitic branch pair 6 are respectively simulated. Antenna 1, antenna 2, antenna 3 in 5, optionally, antenna 1 satisfies VSWR in the 2.2-12 GHz band, that is, the voltage standing wave ratio is less than 2, and antenna 2 realizes the notch of 2.7-3.7 GHz, and antenna 3 realizes A notch of 4.9-6.0 GHz. Thus, an antenna having double notch characteristics is obtained. It can be seen from the figure that the antenna better shields the signal interference in the frequency band where WiMAX and WLAN are located.

Through experiment, the surface current of the antenna at the center frequency of the notch can be obtained at 3.5 GHz. At the same time, the long L-shaped parasitic branch has a relatively concentrated current distribution, which indicates that the structure has a main inhibitory effect on the interference of the WiMAX system; at 5.5 GHz, the surface current is almost entirely distributed in the short L-shaped parasitic branch pair. In the above, this indicates that the structure plays a major role in suppressing the interference of high frequency bands in the WLAN system.

Figure 6 to Figure 8 show the E-plane and H-plane simulated radiation patterns of the antenna at 3 GHz, 4.5 GHz and 8 GHz, respectively. The E plane refers to the plane where the maximum direction of radiation and the electric field are located, and the H plane refers to the magnetic field and The plane where the maximum radiation direction is located can be seen from the figure. The simulated radiation pattern of the antenna is basically similar to that of the symmetric vibrator, and the whole exhibits good radiation characteristics and superior omnidirectional performance.

An embodiment of the above technical solution of the present invention is to open a circular slit on the floor of the back surface of the substrate, and to establish a parasitic branch pair on the circular slit. By adjusting the size of the parasitic branch, a stop band for the predetermined signal can be formed, which can be effectively realized. The suppression of the predetermined signal, and the structure is easy to implement, and the structure is also simple. It can be realized very easily by using a PCB process, that is, an electronic printing process. Alternatively, the logarithm of the parasitic branch pair can be increased or decreased to achieve The suppression of different predetermined signals can be applied to different requirements, and has strong applicability and high practicability.

The above is a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Industrial applicability

The antenna of the above technical solution can effectively suppress interference of a predetermined signal, is applicable to different requirements, has a simple structure, is easy to implement, and has high practicability.

Claims

An antenna comprising a dielectric substrate (2), a radiation patch (1) disposed on a front surface of the dielectric substrate (2), and a floor (4) disposed on a back surface of the dielectric substrate (2), the radiation patch (1) connected to the radio frequency line through the microstrip line (3), the floor (4) is provided with a circular slit (7), and a parasitic extension extending to the inside of the slit is formed symmetrically at the edge of the circular slit (7) The branches are right.
The antenna according to claim 1, wherein the parasitic branch pair comprises: a first parasitic branch pair (5) configured to suppress a predetermined first signal; and a second parasitic branch pair (6) set to suppress a predetermined number The two signals, wherein the length of the first parasitic branch pair (5) is greater than the length of the second parasitic branch pair (6).
The antenna according to claim 2, wherein the length of the first parasitic branch pair (5) is one quarter of a wavelength corresponding to a center frequency of the first signal, and the second parasitic branch pair (6) The length is one quarter of the wavelength corresponding to the center frequency of the second signal.
The antenna of claim 2, wherein the first signal is a global microwave interconnect access WiMAX signal and the second signal is a wireless local area network WLAN signal.
The antenna according to claim 4, wherein said first parasitic branch pair (5) and said second parasitic branch pair (6) are both L-shaped.
The antenna according to claim 5, wherein said first parasitic branch pair (5) has a length of 9.2 mm, a width of 0.5 mm, a left-right symmetric pitch of 9 mm, and a center of said circular slit (7) The pitch is 11.7 mm, the length of the second parasitic branch pair (6) is 7.8 mm, the width is 0.6 mm, the left-right symmetric pitch is 19 mm, and the center-to-center spacing of the circular slit (7) is 12.8 mm.
The antenna according to claim 6, wherein the circular slit (7) has a radius of 14 mm.
The antenna according to claim 7, wherein said radiation patch (1) is a regular hexagon having a side length of 8.9 mm.
The antenna according to claim 8, wherein the microstrip line (3) has a width of 2.6 mm.
The antenna according to claim 9, wherein the dielectric substrate (2) is resistant to a dielectric constant of 4.4, a length of 40 mm, a width of 30 mm, a thickness of 1.4 mm, and a loss tangent of 0.02. A substrate material having a grade of FR4.
The antenna according to claim 1, wherein said parasitic branch pair is only a pair of third parasitic branch pairs (8) arranged to suppress a predetermined signal, said third parasitic branch pair (8) having a length of said A quarter of the wavelength corresponding to the center frequency of the predetermined signal.