CN218334322U - WiFi omnidirectional antenna with filtering function - Google Patents

Abstract

The utility model discloses a WiFi omnidirectional antenna with filtering function, including the medium base plate, the upper surface of medium base plate is equipped with the feed line and two sets of zigzag radiation paster of symmetrical arrangement in the feed line both sides, the lower surface of medium base plate is equipped with trapezoidal radiation paster, low frequency filtering subassembly and high frequency filtering subassembly, wherein, the end of feed line is connected with trapezoidal radiation paster; the low-frequency filtering component comprises two semicircular patches which are symmetrically arranged and are provided with openings in a forming mode, wherein the two semicircular patches are respectively connected with the two groups of zigzag radiation patches; the high frequency filter assembly includes a plurality of resonant rings with openings.

Description

WiFi omnidirectional antenna with filtering function

Technical Field

The utility model belongs to the technical field of antenna structure's technique and specifically relates to indicate a wiFi omnidirectional antenna with filtering capability.

Background

With the increasingly common laying of wireless communication devices in society today, the appearance of various mobile devices such as mobile phones, tablet computers, smart headsets and the like also promotes the continuous popularization of WiFi networks, and the realization of wireless signal transmission through WiFi networks has become an indispensable function of mobile devices. The performance of a WiFi antenna, one of the most important components in a wireless communication device, has a significant impact on the rate and efficiency of signal transmission. However, since the frequency of the WiFi antenna is very close to the frequency of part of mobile communication, the problem of signal interference is often generated, and in addition, high gain and low out-of-roundness are also the difficulties in designing the omnidirectional WiFi antenna, so it is valuable to design a WiFi omnidirectional antenna with high gain and low out-of-roundness and having a filtering function.

Secondly, the problem of structural homogenization in the existing omnidirectional WiFi antenna is serious, the problem of frequency interference is rarely considered, and particularly, the design of realizing a filtering function from the antenna structure is rarely adopted. Moreover, since the WiFi antenna has a high requirement on size, adding a filtering function to the antenna in a miniaturized environment is not difficult in design, and it is also necessary to ensure high gain performance of the WiFi antenna and low non-circularity of a pattern, which also adds a challenge to the design of the WiFi filtering antenna. Therefore, the realization of miniaturization, high gain and low out-of-roundness on the basis of realizing the filtering performance is a great difficulty in designing the WiFi antenna.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's is not enough, provide one kind and can cover 2.4-2.5GHz frequency channel, have filtering capability, high-gain wiFi omnidirectional antenna, this antenna possesses filtering capability, high-gain, low out of roundness, low-cost class characteristic simultaneously.

In order to achieve the above object, the utility model provides a WiFi omnidirectional antenna with filtering function, including the medium base plate, the upper surface of medium base plate is equipped with the feed line and two sets of zigzag radiation patches symmetrically arranged on both sides of the feed line, the lower surface of medium base plate is equipped with trapezoidal radiation patch, low frequency filter subassembly and high frequency filter subassembly, wherein, the end of feed line is connected with trapezoidal radiation patch; the low-frequency filtering component comprises two semicircular patches which are symmetrically arranged and provided with openings in a forming mode, wherein the two semicircular patches are respectively connected with the two groups of zigzag radiation patches; the high frequency filter assembly includes a plurality of resonant rings with openings.

Further, every the resonance ring comprises the octagonal ring that three size skew reduces in proper order, wherein, it is same each octagonal ring homomoulding of resonance ring has aligned opening.

Further, the device comprises four resonance rings which are arranged in a matrix.

Further, each group of zigzag radiation patches includes a first zigzag radiation unit and a second zigzag radiation unit which are arranged side by side on the same side, wherein the semicircular patches are connected with the first zigzag radiation unit.

Furthermore, the tail end of the feeder line is connected with the trapezoidal radiation patch in a penetrating mode, and the semicircular patch is connected with the zigzag radiation patch in a penetrating mode through a metalized through hole preset in the medium substrate.

Furthermore, the size of the resonant ring and the opening position thereof are determined according to the required filtering frequency.

Further, the size of the semicircular patch is determined according to the required filtering frequency.

Further, the trapezoidal radiation patch and the zigzag radiation patch are not overlapped in the vertical direction.

The utility model adopts the above technical scheme, its beneficial effect lies in:

1) The utility model discloses a good impedance match of antenna and stable omnidirectional pattern have covered 2.4GHz-2.5 GHz's wiFi frequency channel, and the emission coefficient of antenna can reach-15 dB, and this antenna can have abundant application market satisfying present wiFi frequency channel commonly used. Compared with the traditional regular radiation patch, the antenna adopts the sawtooth-shaped metal patch as a radiation main body.

2) The utility model discloses an antenna possesses high gain performance, generally is less than the problem of 2 dBi's gain for traditional omnidirectional antenna, the utility model discloses an antenna can realize the gain stabilization more than 3dBi in the work bandwidth, can improve its performance characteristic to the wiFi antenna undoubtedly greatly, makes it have more extensive application scene.

3) The utility model discloses an antenna possesses the low out-of-roundness performance of omnidirectional radiation, can not compromise high gain and the relatively poor requirement of out-of-roundness for traditional omnidirectional antenna, the utility model discloses an antenna realizes stabilizing high gain and keeping out-of-roundness below 1dBi in the bandwidth scope, has good omnidirectional radiation performance, adapts to the applied scene of wiFi antenna.

4) The utility model discloses an antenna possesses the function of carrying out filtering to the partial frequency channel beyond the working frequency channel, and the filtering performance of antenna is rarely considered to traditional wiFi antenna, the utility model discloses an antenna has carried out filtering to the higher frequency channel and the lower frequency channel of antenna respectively through the filtering structure of two kinds of differences, greatly reduced the radiant efficiency and the gain of filtering frequency.

Drawings

Fig. 1-2 are schematic diagrams of the overall structure of the antenna according to the embodiment.

Fig. 3 is a schematic structural view of an upper surface of an antenna according to an embodiment.

Fig. 4 is a schematic structural diagram of a lower surface of the antenna according to the embodiment.

FIG. 5 is a graph showing a reflection coefficient curve according to an embodiment.

FIG. 6 is a schematic diagram of a gain curve of an embodiment.

FIG. 7 is a graph showing the radiation efficiency curves of the examples.

FIG. 8 is a schematic diagram of a peak gain curve of an embodiment.

Fig. 9 is a directional diagram of the antenna of the embodiment at a frequency of 2.4 GHz.

Fig. 10 is a directional diagram of the antenna of the embodiment at a frequency of 2.45 GHz.

Fig. 11 is a directional diagram of the antenna of the embodiment at a frequency of 2.5 GHz.

The antenna comprises a dielectric substrate 1, a feeder 2, a zigzag radiating patch 3, a first zigzag radiating element 31, a second zigzag radiating element 32, a semicircular patch 4, a resonant ring 5 and a trapezoidal radiating patch 6.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete.

Referring to fig. 1 to 4, in the present embodiment, a WiFi omnidirectional antenna with a filtering function includes a dielectric substrate 1, where the dielectric substrate 1 is an FR4 substrate with a thickness of 1mm and a dielectric constant of 4.4. For convenience of explanation, the two surfaces arranged up and down in the dielectric substrate 1 shown in fig. 1 and 2 are defined as an upper surface and a lower surface, respectively.

Referring to fig. 3, in the present embodiment, a power feed line 2 and two groups of zigzag radiation patches 3 symmetrically arranged on both sides of the power feed line 2 are printed on the upper surface of a dielectric substrate 1, wherein the power feed line 2 is arranged to extend along a central line direction of the dielectric substrate 1, so that a coplanar waveguide structure is formed by the power feed line 2 and the two groups of zigzag radiation patches 3 to feed power, and the zigzag radiation patches 3 are excited by combining direct feeding and coupled feeding, thereby effectively improving impedance matching performance of the antenna and stabilizing a radiation pattern of the antenna.

Further, each group of the zigzag radiating patches 3 of the present embodiment includes a first zigzag radiating element 31 and a second zigzag radiating element 32 that are arranged side by side on the same side, where outer edges of the first zigzag radiating element 31 and the second zigzag radiating element 32 are both zigzag for optimizing impedance matching performance.

Referring to fig. 4, in the present embodiment, a trapezoidal radiation patch 6, a low frequency filter component and a high frequency filter component are disposed on the lower surface of the dielectric substrate 1, wherein the trapezoidal radiation patch 6 of the present embodiment is in a trapezoidal shape with a wide left side and a narrow left side as shown in the drawing. The trapezoidal radiation patch 6 extends along the central line direction of the dielectric substrate 1, and the trapezoidal radiation patch 6 and the zigzag radiation patch 3 are not overlapped in the vertical direction, so that the gain of the antenna is effectively improved on the premise of keeping miniaturization. The tail end of the feeder line 2 is connected with the trapezoidal radiation patch 6 in a penetrating way through a metalized through hole preset in the dielectric substrate 1.

In the present embodiment, to implement the filtering function for the lower frequency of 1.7GHz-2GHz, the low frequency filtering component includes two semicircular patches 4 which are symmetrically arranged and formed with openings, that is, the two semicircular patches 4 are symmetrically arranged with the central line of the dielectric substrate 1 as the axis. The opening of each semicircular ring patch 4 is adjacent to the side edge facing the dielectric substrate 1. Two semicircle ring patches 4 are connected with two sets of zigzag radiation patches 3 respectively, specifically, wear to establish the connection mutually through the metallization via hole that dielectric substrate 1 was preset between the semicircle ring patch 4 of this embodiment and the first zigzag radiation unit 31.

Further, the size of the semicircular patches 4 in the present embodiment is determined according to the required filtering frequency, and those skilled in the art can correspondingly set the size of the semicircular patches 4 according to the actual filtering frequency requirement, which is not specifically limited herein.

In the present embodiment, in order to implement the filtering function for the higher frequency of 2.9GHz-3.2GHz, the high frequency filtering assembly includes a plurality of resonant rings 5 with openings, wherein the present embodiment includes four resonant rings 5 arranged in a 2 × 2 matrix. Wherein, every resonant ring 5 comprises by the octagonal ring that three size squints the reduction in proper order, and each octagonal ring homomorphism of same resonant ring 5 all takes shape to have aligned opening. The opening of the resonance ring 5 of this embodiment is adjacent to the side edge facing the dielectric substrate 1.

Further, the size and the opening position of the resonant ring 5 of the present embodiment are determined according to the required filtering frequency, and those skilled in the art can correspondingly set the size and the opening position of the resonant ring 5 according to the actual filtering frequency requirement, which is not limited herein.

In order to facilitate understanding of the above-mentioned antenna performance, the following description is made by taking two types of antennas with conventional structures as reference examples.

Referring to the reflection coefficient graph shown in fig. 5, the antenna 1 is a reflection coefficient curve of the antenna structure of the present embodiment, and the antennas 2 and 3 are reflection coefficient curves of two conventional structures, and it can be seen from the graph that the antenna reflection coefficient of the antenna structure of the present embodiment in the frequency band of 2.4-2.5GHz is less than-10 dB, and can cover the WiFi frequency band.

Referring to the schematic diagram of the gain curve shown in fig. 6, the antenna 1 is a gain curve of the antenna structure adopting the embodiment, and the antennas 2 and 3 are gain curves of two conventional structures; referring to the schematic diagram of the radiation efficiency curve shown in fig. 7, the antenna 1 is a radiation efficiency curve of the antenna structure adopting the embodiment, and the antennas 2 and 3 are radiation efficiency curves of two types of conventional structures; as can be seen from the illustration, the low frequency filtering component and the high frequency filtering component of the present embodiment can effectively reduce the gain and the radiation efficiency of the frequency bands other than the operating frequency band, and achieve the desired filtering effect.

Referring to the peak gain curve shown in fig. 8, it can be seen that the peak gain of the antenna of this embodiment in the operating frequency band is about 3dBi, and the radiation efficiency is greater than 87%.

Referring to the directional diagrams shown in fig. 9-11, the antenna of the present embodiment corresponds to the directional diagrams at three frequencies, i.e., 2.4GHz, 2.45GHz, and 2.5GHz, and as can be seen from the diagrams, the antenna exhibits good omnidirectional radiation performance, the out-of-roundness is less than 1dBi, and the cross polarization is less than-24 dB.

The above-described embodiments are merely preferred embodiments of the present invention, which are not intended to limit the present invention in any way. Those skilled in the art can make many changes, modifications, and equivalents of the embodiments of the invention without departing from the scope of the invention. Therefore, the content of the technical solution of the present invention, equivalent changes made by the idea of the present invention, should be covered by the protection scope of the present invention.

Claims (8)

1. A WiFi omnidirectional antenna with a filtering function comprises a dielectric substrate (1), and is characterized in that: the upper surface of the medium substrate (1) is provided with a feeder line (2) and two groups of zigzag radiation patches (3) symmetrically arranged on two sides of the feeder line (2), the lower surface of the medium substrate (1) is provided with a trapezoidal radiation patch (6), a low-frequency filtering component and a high-frequency filtering component, and the tail end of the feeder line (2) is connected with the trapezoidal radiation patch (6); the low-frequency filtering component comprises two semicircular patches (4) which are symmetrically arranged and provided with openings in a forming mode, wherein the two semicircular patches (4) are respectively connected with the two groups of zigzag radiation patches (3); the high frequency filter assembly includes a plurality of resonance rings (5) with openings.

2. The WiFi omni directional antenna with filtering function of claim 1, characterized in that: every resonance ring (5) are become by the octagonal ring that three size squints in proper order and reduce, wherein, same each octagonal ring homomoulding of resonance ring (5) has the opening of alignment.

3. The WiFi omni directional antenna with filtering function as claimed in claim 1, wherein: comprises four resonance rings (5) arranged in a matrix.

4. The WiFi omni directional antenna with filtering function as claimed in claim 1, wherein: each group of the sawtooth-shaped radiating patches (3) comprises a first sawtooth-shaped radiating unit (31) and a second sawtooth-shaped radiating unit (32) which are arranged side by side on the same side, wherein the semicircular patches (4) are connected with the first sawtooth-shaped radiating units (31).

5. The WiFi omni directional antenna with filtering function as claimed in claim 1, wherein: the tail ends of the feeder lines (2) are connected with the trapezoidal radiation patches (6) in a penetrating mode, and the semicircular ring patches (4) are connected with the zigzag radiation patches (3) in a penetrating mode through metalized through holes which are preset in the medium substrate (1).

6. The WiFi omni directional antenna with filtering function as claimed in claim 1, wherein: the size of the resonance ring (5) and the opening position thereof are determined according to the required filtering frequency.

7. The WiFi omni directional antenna with filtering function of claim 1, characterized in that: the size of the semicircular patch (4) is determined according to the required filtering frequency.

8. The WiFi omni directional antenna with filtering function as claimed in claim 1, wherein: the trapezoidal radiation patch (6) is not vertically overlapped with the zigzag radiation patch (3).

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