CN216362159U

CN216362159U - Novel low-out-of-roundness omnidirectional high-gain antenna applied to WIFI communication system

Info

Publication number: CN216362159U
Application number: CN202123287569.5U
Authority: CN
Inventors: 孙丽; 魏信辉; 王宗坤; 夏晨硕; 洪何知; 付香芽
Original assignee: Ndk Kunshan Co ltd
Current assignee: Ndk Kunshan Co ltd
Priority date: 2021-12-24
Filing date: 2021-12-24
Publication date: 2022-04-22
Anticipated expiration: 2031-12-24

Abstract

The utility model provides a novel low-out-of-roundness omnidirectional high-gain antenna applied to a WIFI communication system, which comprises a dielectric plate, wherein a 180-degree reverse one-in-two feed network and a dual-band array antenna are arranged on the front surface of the dielectric plate, and the dual-band array antenna is grounded. The utility model adopts the coplanar waveguide structure to feed the unit patches, improves out-of-roundness and has better omnidirectional characteristic; in order to meet the requirements of WIFI multiple application scenes, the utility model designs a 1 x 2 array antenna through a two-frequency-division 180-degree backward feed network on the basis of the same radiation unit, the array antenna uses a partial ground plate structure instead of a ground plate structure, the high gain is realized, meanwhile, the performance of low out-of-roundness can be maintained, the gain low frequency of the array antenna can reach about 3dB, the high frequency can reach about 4dB, the gain is improved by about 1dB compared with that of the unit antenna on the whole, and the WIFI multiple application antenna is suitable for popularization.

Description

Novel low-out-of-roundness omnidirectional high-gain antenna applied to WIFI communication system

Technical Field

The utility model relates to the technical field of antennas suitable for a wireless broadband communication system, in particular to a novel low-out-of-roundness omnidirectional high-gain antenna applied to a WIFI communication system.

Background

With the advent of the information age, the intelligent terminal and various wireless data services have been increased explosively, which provides more severe requirements for the WIFI communication system, and in order to meet the requirements of faster communication speed and larger communication capacity of the system, the novel omnidirectional WIFI antenna needs to cover a wider working frequency band, higher radiation gain and a reliable radiation pattern, so that the antenna can provide high-speed and stable information transmission for more devices. In a WIFI communication system, under the premise that the normal radiation gain of an antenna is kept in a plurality of scenes, the coverage surface of the antenna can reach 360 degrees so as to cover WiFi signals in a specific area.

With the rapid development of wireless communication technology, the application range of Wireless Local Area Networks (WLANs) is wider and wider, and from the aspect of spectrum resource allocation, the bandwidth and transmission rate in the original 802.lb/g protocol are very limited, and cannot meet the requirements of data communication nowadays, so that it is a necessary trend of WLAN development to be compatible with an 802.1Ia protocol with higher frequency and more abundant spectrum resources, which requires that a WLAN antenna must meet dual-frequency characteristics.

WIFI antenna among the prior art, its cable is many and walk the line complicacy, in order to reduce the cable and follow the mutual coupling between the antenna element, need increase the unit arm and with the feeder cable interval, lead to the antenna bulky. And the device is operated in a single frequency band, has large loss and does not meet the requirement on application. Or the gain is low, and the use effect is not good.

Although the traditional microstrip antenna can realize the characteristic of miniaturization, the radiation directions are mostly one-way, and only a single working frequency band is adopted, so that the microstrip antenna is difficult to be applied to a WIFI communication system. Patch antennas often employ a coplanar waveguide feed structure to achieve omnidirectional radiation performance. However, the conventional patch unit has the problems of low gain and poor use effect. Thus, it is desirable to improve the gain of an omni-directional antenna while maintaining low out-of-roundness.

Therefore, in order to overcome the defects in the prior art, it is necessary to design a novel low out-of-roundness omnidirectional high-gain antenna applied to a WIFI communication system to solve the above problems.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the utility model aims to provide a novel low-out-of-roundness omnidirectional high-gain antenna applied to a WIFI communication system.

In order to achieve the above objects and other related objects, the present invention provides the following technical solutions: the utility model provides a be applied to novel low non-circularity qxcomm technology high gain antenna of WIFI communication system, includes the dielectric plate, the front of dielectric plate is equipped with 180 reverse one minute two feed networks and dual-band array antenna, dual-band array antenna part ground connection.

The preferable technical scheme is as follows: the dual-band array antenna is used as a radiating unit and comprises two first rectangular patches which are arranged on the front surface of the dielectric plate in a mirror symmetry mode and are arranged at intervals.

The preferable technical scheme is as follows: the top of the first rectangular patch is semicircular, square or triangular, the bottom of the first rectangular patch is triangular, a stepped, sawtooth or wavy structure is arranged at the edge of the first rectangular patch, and at least one C-shaped groove is etched in the center of the first rectangular patch.

The preferable technical scheme is as follows: the 180-degree reverse one-to-two feed network is arranged in the middle of the two first rectangular patches and used for feeding the two first rectangular patches, the 180-degree reverse one-to-two feed network comprises a Wilkinson power divider, a left-hand transmission line added with an RC circuit and a traditional microstrip line, and the end parts of the left-hand transmission line and the traditional microstrip line are respectively connected with the bottom ports of the two first rectangular patches.

The preferable technical scheme is as follows: the patch also comprises four second rectangular patches and a third rectangular patch; the four second rectangular patches are grouped pairwise, the two groups of second rectangular patches are respectively symmetrical about the central axis of the ports of the two first rectangular patches and are arranged on the front side of the dielectric plate, and the third rectangular patch is arranged on the back side of the dielectric plate and corresponds to the 180-degree reverse one-to-two feed network.

The preferable technical scheme is as follows: the first rectangular patch, the second rectangular patch and the third rectangular patch are all formed by coating copper on the surface of the dielectric slab and etching.

Due to the application of the technical scheme, the patch antenna which can cover 2.41-2.57GHz and 2.87-3.77GHz frequency bands simultaneously and is applied to the WIFI communication system is provided. The antenna utilizes the dielectric plate printed feed network and the radiating element to reduce the volume and the section height of the antenna. On the basis of the unit, a 1-2 array antenna is designed, and a reverse one-in-two feed network consisting of a Wilkinson power divider, a left-handed transmission line and a traditional microstrip line is designed to obtain a 180-degree reverse feed network with stable phase difference for feeding the array antenna. The array antenna has the characteristics of dual frequency bands, omni-direction, low out-of-roundness, high gain and simple and stable structure.

Drawings

Fig. 1 is a schematic diagram of an antenna unit according to the present invention.

Fig. 2 is a schematic front view of the antenna of the present invention.

Fig. 3 is a schematic diagram of the back side of the antenna of the present invention.

In the above drawings, 1, a dielectric plate; 2. a first rectangular patch; 3. a C-shaped groove; 4. a second rectangular patch; 5. a third rectangular patch; 6. a Wilkinson power divider; 7. a left-handed transmission line; 8. a conventional microstrip line.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

Please refer to fig. 1-3. It should be understood that in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which the products of the present invention are usually placed in when used, which is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. The terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should be further noted that, unless otherwise specifically stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, and a communication between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

as shown in fig. 1-3, the present invention provides a novel low out-of-roundness omnidirectional high-gain antenna applied to a WIFI communication system. The antenna is of a planar structure and comprises a dielectric plate 1 and a dual-band array antenna which is arranged on the dielectric plate 1 and serves as a radiating unit, a 180-degree reverse one-to-two feed network for realizing energy distribution and a ground plane for keeping low out-of-roundness so as to ensure that the antenna meets dual-frequency characteristics and achieves all-aspect coverage of signals, and the low out-of-roundness is kept while high gain is considered.

The dual-band array antenna is used as a radiating unit and comprises two first rectangular patches 2 which are printed on the front surface of the dielectric plate in mirror symmetry and are arranged at intervals. The top of the first rectangular patch 2 is semicircular (square or triangular), the bottom of the first rectangular patch 2 is triangular, a stepped (wavy or zigzag) structure is arranged at the edge of the first rectangular patch, and a C-shaped groove 3 is etched in the center of the first rectangular patch.

A 180 ° reverse-one-to-two feed network is provided in the middle of the two first rectangular patches 2 and is used to feed the two first rectangular patches 2. The 180-degree reverse one-to-two feed network comprises a Wilkinson power divider 6, a left-hand transmission line 7 with an RC circuit and a traditional microstrip line 8, wherein the ends of the left-hand transmission line 7 and the traditional microstrip line 8 are respectively connected with the bottom ports of the two first rectangular patches 2.

The grounding plane comprises four second rectangular patches 4 arranged on the front surface of the dielectric plate and a third rectangular patch 5 arranged on the back surface of the dielectric plate 1; the four second rectangular patches 4 are grouped in pairs, the two groups of second rectangular patches 4 are respectively arranged symmetrically about the central axis of the ports of the two first rectangular patches 2, and the third rectangular patches 5 positioned on the back surface of the dielectric plate 1 are arranged correspondingly to the feed network.

Description of the drawings:

for a 180-degree reverse one-to-two feed network, in order to overcome the defect that the traditional Wilkinson power divider 6 cannot obtain stable phase difference under a wide frequency band, a phase adjusting transmission line consisting of a left-handed transmission line 7 and a traditional microstrip line 8 is added behind the Wilkinson ring 6. The left-hand transmission line 7 is added with an RC circuit to realize 180-degree phase shift function, so that a stable power division phase shifter with 180-degree phase difference is obtained.

For the antenna structure, the traditional three-dimensional antenna is formed by cutting, bending and splicing copper sheets, the manufacturing is complicated, the precision is low, all the feed structures, the radiation structures and the coupling structures are printed on the dielectric plate 1, and the size and the section height of the antenna are effectively reduced.

Specifically, the dual-band array antenna adopts the mode that the dielectric plate 1 is used as a carrier, copper is plated on the dielectric plate 1 to be used as a radiating element, and the coplanar waveguide feed structure is adopted to realize the function of low out-of-roundness. And etching a C-shaped groove 3 in the center of the first rectangular patch 2 for controlling a path of the surface current flowing through the array antenna, thereby realizing two working frequency bands. The top end of the first rectangular patch 2 is designed into a semicircle shape, and the bottom end is designed into a step shape, so that the working frequency is optimized, and the required frequency band is achieved.

The utility model forms 1 x 2 linear array antenna with two radiation units to realize high gain antenna function, and feeds power to the input ports of the two radiation units through the 180-degree power division phase shifter, so that the energy input to the two radiation units is divided equally, and the phase is reversed.

Different from the traditional antenna, the bottom surface of the whole dielectric plate 1 is not plated with copper to be used as a large floor, but the front surface of the whole dielectric plate 1 is provided with four second rectangular patches 4 which are matched with the back surface of the dielectric plate 1 and are provided with a third rectangular patch 5 corresponding to a 180-degree reverse one-to-two feed network to be used as a ground plane, so that the influence of the ground plate plane on an antenna radiation directional diagram is avoided, and the characteristic of low out-of-roundness of the array antenna can be kept while the gain is improved.

For miniaturization, the utility model is realized by reasonably adjusting the placement position of the radiation patch, and the feed network is designed at the gap between the two antenna units, so that the antenna structure is more compact.

Fig. 1 shows a specific structure of a radiation unit of the present invention. The specific dimensions of the dielectric plate and the radiation element as a whole are 12.8mm × 32mm × 0.8 mm. In the centre of the first rectangular patch 2 a C-shaped slot 3 of width g1 is cut, which is used to control the path of the surface current through the antenna, thereby achieving two operating bands. The top of the first rectangular patch 2 is designed into a semicircle shape, and the bottom is designed into a step shape, so that the working frequency is optimized, and the required frequency band is achieved.

A first rectangular patch 2 is etched on an FR-4 dielectric board. The first rectangular patch 2 is made of copper and has a thickness of 0.018 mm; the specific parameters of the FR-4 dielectric plate are that the dielectric constant is 4.4, the loss tangent is 0.02, the thickness is 0.8mm, and the whole plane under the dielectric plate 1 is plated with copper as a grounding plane.

Fig. 2 shows the whole structure and front and back of 1 x 2 array antenna, two radiation units are arranged on two sides in mirror symmetry, 180-degree reverse one-in-two feed network is arranged in the middle, and the radiation units are added with 180-degree reverse one-in-two feed network, and the whole size is 12.8mm × 100mm × 0.8 mm. The 180-degree reverse one-to-two feed network and the radiation unit are printed on the front surface of the dielectric plate. The port 1 and the port 2 of the antenna unit are respectively connected with a left-hand transmission line and a right-hand transmission line (traditional microstrip line) of the power division phase shifter. Thus when a signal is input through port a, power is equally distributed to port 1 and port 2, and the phase of port 1 leads the phase of port 2 by 180 °.

Therefore, the utility model has the following advantages:

the utility model adopts the PCB printing technology, and compared with the traditional copper sheet stereo antenna, the manufacturing time is short, the manufacturing process is simple, the manufacturing precision is high, the structure is stable and easy to control, and the improvement is larger than that of the traditional process. The coverage frequency of the antenna is 2.41-2.57GHz and 2.87-3.77GHz, and the size of the whole structure of the antenna is only 12.8mm multiplied by 100mm multiplied by 0.8 mm.

The utility model adopts the coplanar waveguide structure to feed the unit patches, improves the out-of-roundness and has better omnidirectional characteristic. In order to meet the requirements of WIFI multiple application scenes, the utility model designs a 1 x 2 array antenna through a two-frequency-division 180-degree backward feed network on the basis of the same radiation unit, the array antenna uses a partial ground plate structure instead of a ground plate structure, the high gain is realized, meanwhile, the performance of low out-of-roundness can be maintained, the gain low frequency of the array antenna can reach about 3dB, the high frequency can reach about 4dB, and the gain is improved by about 1dB compared with that of the unit antenna on the whole.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the utility model. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. The utility model provides a be applied to novel low high gain antenna of non-circularity qxcomm technology of WIFI communication system, includes the dielectric plate, its characterized in that: the front surface of the dielectric plate is provided with a 180-degree reverse one-to-two feed network and a dual-band array antenna, and the dual-band array antenna is grounded.

2. The novel low out-of-roundness omnidirectional high-gain antenna applied to a WIFI communication system according to claim 1, wherein: the dual-band array antenna is used as a radiating unit and comprises two first rectangular patches which are arranged on the front surface of the dielectric plate in a mirror symmetry mode and are arranged at intervals.

3. The novel low out-of-roundness omnidirectional high-gain antenna applied to a WIFI communication system according to claim 2, wherein: the top of the first rectangular patch is semicircular, square or triangular, the bottom of the first rectangular patch is triangular, a stepped, sawtooth or wavy structure is arranged at the edge of the first rectangular patch, and at least one C-shaped groove is etched in the center of the first rectangular patch.

4. The novel low out-of-roundness omnidirectional high-gain antenna applied to a WIFI communication system according to claim 3, wherein: the 180-degree reverse one-to-two feed network is arranged in the middle of the two first rectangular patches and used for feeding the two first rectangular patches, the 180-degree reverse one-to-two feed network comprises a Wilkinson power divider, a left-hand transmission line added with an RC circuit and a traditional microstrip line, and the end parts of the left-hand transmission line and the traditional microstrip line are respectively connected with the bottom ports of the two first rectangular patches.

5. The novel low out-of-roundness omnidirectional high-gain antenna applied to a WIFI communication system according to claim 4, wherein: the patch also comprises four second rectangular patches and a third rectangular patch; the four second rectangular patches are grouped pairwise, the two groups of second rectangular patches are respectively symmetrical about the central axis of the ports of the two first rectangular patches and are arranged on the front side of the dielectric plate, and the third rectangular patch is arranged on the back side of the dielectric plate and corresponds to the 180-degree reverse one-to-two feed network.

6. The novel low out-of-roundness omnidirectional high-gain antenna applied to a WIFI communication system according to claim 5, wherein: the first rectangular patch, the second rectangular patch and the third rectangular patch are all formed by coating copper on the surface of the dielectric slab and etching.