Patent Grant
11881622
The present invention relates to the field of antennas, and specifically, to an antenna element with a filtering function, a filtering radiation unit, and an antenna.
With the rapid development of communication, the fifth generation of communication has come. Due to a consideration of operating costs, the 4G+5G mode is going to become the mainstream trend of communication development. However, a 4G antenna and a 5G Massive MIMO antenna are mixed in an array, and a radiation unit of the 4G antenna causes severe interference to a radiation unit of the 5G antenna, which causes beam deformation of the Massive MIMO antenna, so that the coverage is affected and the isolation between systems is not up to standard.
To resolve the foregoing problems, a technical solution commonly used in the prior art is to insert a band-stop filter on an arm of a low-frequency radiation unit, to effectively suppress an induced current generated by a high-frequency electromagnetic wave on the low-frequency radiation unit, thereby greatly weakening an impact of the low-frequency radiation unit on a high-frequency radiation unit. However, several independent filter structures are generally loaded. These filter structures are lumped elements, which introduce discontinuities on arms of oscillators and also affect matching between the oscillators, to cause difficulty in achieving broadband operation and meeting needs of antenna operation.
A first objective of the present invention is to provide an antenna element with a filtering function, to overcome the existing problem of an insufficient bandwidth due to discontinuities introduced by insertion of a band-stop filter.
To achieve the first objective, a specific solution adopted in the present invention is the antenna element with a filtering function. The antenna element is tubular, and the tubular antenna element is provided with a spiral slit arranged around the periphery of the tubular antenna element and extending in an axial direction.
In a preferable solution, the antenna element is in a shape of a circular tube.
Based on the foregoing antenna element with a filtering function, a second objective of the present invention is to provide a filtering radiation unit that can cooperate with a high-frequency radiation element during use to radiate a high-frequency signal and a low-frequency signal simultaneously.
To achieve the second objective, a specific solution adopted in the present invention is the filtering radiation unit, including a support column. An upper part of the support column is electrically connected to at least one antenna element as described above.
In a preferable solution, the upper part of the support column is electrically connected to at least one element pair, and the element pair includes two antenna elements that are arranged coaxially.
In a preferable solution, the upper part of the support column is electrically connected to two element pairs, and axes of the two element pairs are perpendicular to each other.
Based on the foregoing filtering radiation unit, a third objective of the present invention is to provide an antenna with good performance, small volume, and high integration.
To achieve the third objective, a specific solution adopted in the present invention is the antenna, including a reflecting plate. At least one filtering radiation unit as described above is fixedly arranged on the reflecting plate.
In a preferable solution, several high-frequency radiation units are arranged on a peripheral side of each filtering radiation unit, and the high-frequency radiation units are fixedly arranged on the reflecting plate.
In a preferable solution, the upper part of the support column is electrically connected to at least one element pair, the element pair includes two antenna elements that are arranged coaxially, and one high-frequency radiation unit is arranged laterally below each antenna element.
In a preferable solution, the upper part of the support column is electrically connected to two element pairs, axes of the two element pairs are perpendicular to each other, four high-frequency radiation units are arranged on the peripheral side of each filtering radiation unit, and the four high-frequency radiation units are distributed uniformly.
An effect that the antenna element can achieve is that the spiral slit on the element of the present invention forms a continuous filtering structure, so that a larger bandwidth can be obtained compared with the existing method of inserting a band-stop filter. In addition, suppression of a high-frequency current can be maximized, and interference to a low-frequency current can be minimized, to transmit the low-frequency current forwardly and radiate a low-frequency signal while reversely suppressing a high-frequency induced current, to avoid interference from a high-frequency signal.
An effect that the foregoing filtering radiation unit can achieve is that with a feature that the antenna element conducts the low-frequency current and meanwhile suppresses the interference from the high-frequency current, the filtering radiation unit can be used in conjunction with the high-frequency radiation unit, to radiate the high-frequency signal and the low-frequency signal simultaneously.
An effect that the foregoing antenna can achieve is that the antenna can transmit the low-frequency signal and the high-frequency signal simultaneously, thereby effectively improving the integration of the antenna and reducing the volume of the antenna.
Description of drawings: 1. Slit, 2. Support column, 3. High-frequency radiation unit, and 4. Reflecting plate.
The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are merely some embodiments of the present invention rather than all of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
Referring to
A hollow tube body provided with one round of spiral slit on each section may be equivalent to an LC parallel resonant circuit, as shown in
where j is an imaginary number, C1 and C2 are equivalent capacitance values, L1 is an equivalent resistance value, fh is a high-frequency current frequency, and fl is a low-frequency current frequency.
At a resonant frequency, an antenna element circuit is in an open-circuit state for an external electric field, and an impedance tends to be infinite. In this case, the external electric field does not generate an induced current. When the frequency is much lower than the resonant frequency, a hollow tube body provided with a spiral slit is in a state of low inductive reactance and high capacitive reactance, which has only a small impact on the low-frequency radiation and impedance matching.
Under the condition of a high-frequency current frequency fh, the antenna element appears as an open circuit, and under the condition of a low-frequency current frequency fl, the antenna element appears as a short circuit. Based on this, an inner diameter of the antenna element is defined as d, a thickness is defined as h, a width of the slit 1 is defined as g, and a distance between two adjacent spirals of the slit 1 is defined as w. By adjusting w, g, and d, suppression of a high-frequency current can be maximized, and interference in a low-frequency current can be minimized, to achieve an effect of transmitting the low-frequency current forwardly and radiating a low-frequency signal while reversely suppressing a high-frequency induced current. In addition, because the slit 1 is spiral, w is fixed, that is, in an effective action area of the antenna element where the slit 1 is located, the antenna element is uniform and continuous, thereby ensuring that the antenna element can obtain a sufficient bandwidth. Further, a relationship between parameters is that g is directly proportional to C1. When g increases, the resonant frequency of the equivalent circuit increases. As shown in
In addition, it should be noted that, when w, g, and d are adjusted, overall requirements of the antenna need to be met, or adaptive adjustments are made to the antenna to ensure smooth installation.
Further, the antenna element is in the shape of a circular tube, which can reduce processing difficulty. In other embodiments of the present invention, the antenna element may be set in other shapes, for example, in a shape of a square tube, as long as the size is changed according to an actual needed radiation frequency.
Referring to
On one hand, the support column 2 is configured to support the antenna element, to control a distance between reflecting plates 4 of remaining antennas, so that needs of installing other components are met, and on the other hand, the support column is further configured to feed the antenna element. The quantity of antenna elements may be flexibly selected according to an actual use need.
With a feature that the antenna element conducts the low-frequency current and meanwhile suppresses the interference from the high-frequency current, the filtering radiation unit can be used in conjunction with the high-frequency radiation unit, to radiate the high-frequency signal and the low-frequency signal simultaneously. For example, the filtering radiation unit may be configured to radiate a low-frequency 4G signal, and the high-frequency radiation element may be configured to radiate a high-frequency 5G signal. The induced current formed by the 5G signal on the filtering radiation unit is suppressed, thereby preventing the interference of the 4G signal to the 5G signal.
Further, the upper part of the support column 2 is electrically connected to at least one element pair, and the element pair includes two antenna elements that are arranged coaxially.
One element pair is configured to complete a signal transmission task in one polarization direction, and a vertically polarized signal or a horizontally polarized signal may be transmitted according to an actual need. It should be noted that, insulating treatment is needed between two antenna elements. During practical application, a gap may be kept between two composite elements, and then power is fed to the two antenna elements respectively. In this case, the support column 2 may be implemented by a balancer. With the help of the balancer, unbalanced coaxial feeding may be converted into a feature of balanced feeding, and symmetry of a pattern of the filtering radiation unit can be ensured.
Further, the upper part of the support column 2 is electrically connected to two element pairs, and axes of the two element pairs are perpendicular to each other. In this case, the filtering radiation unit may transmit the vertically polarized signal and the horizontally polarized signal simultaneously, to improve signal transmission efficiency.
Referring to
Further, several high-frequency radiation units 3 are arranged on a peripheral side of each filtering radiation unit, and the high-frequency radiation units 3 are fixedly arranged on the reflecting plate 4.
The high-frequency radiation unit 3 is configured to radiate the high-frequency signal. Because the filtering radiation unit may conduct the low-frequency current to radiate the low-frequency signal while suppressing the high-frequency current, to prevent the high-frequency signal from being interfered with by the low-frequency signal, such a combination can transmit the low-frequency signal and the high-frequency signal simultaneously, thereby effectively improving the integration of the antenna and reducing the volume of the antenna. For example, the filtering radiation unit is configured to transmit a low-frequency 4G signal, and a high-frequency radiation unit 3 is configured to transmit a high-frequency 5G signal.
Further, the upper part of the support column 2 is electrically connected to at least one element pair, the element pair includes two antenna elements that are arranged coaxially, and one high-frequency radiation unit 3 is arranged laterally below each antenna element.
Further, the upper part of the support column 2 is electrically connected to two element pairs, axes of the two element pairs are perpendicular to each other, four high-frequency radiation units 3 are arranged on the peripheral side of each filtering radiation unit, and the four high-frequency radiation units 3 are distributed uniformly.
All filtering radiation units are arrayed to form a low-frequency antenna, and all high-frequency radiation units 3 are arrayed to form a high-frequency antenna. For example, the low-frequency antenna may be applied as an FDD antenna, and the high-frequency antenna may be applied as a TDD antenna. Therefore, an impact of beams of the FDD antenna on those of the TDD antenna may be effectively weakened, a beam coverage index of the TDD antenna is met, and a port isolation index is greatly improved to realize the FDD+TDD antenna.
The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present invention. Various modifications to these embodiments are obvious to a person skilled in the art, and the general principles defined in this specification may be implemented in other embodiments without departing from the spirit and scope of the present invention. Therefore, the present invention is not intended to be limited to these embodiments illustrated in this specification, but shall be construed in the widest scope consistent with the principles and novel features disclosed in this specification.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201911114520.4 | Nov 2019 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2019/120096 | 11/22/2019 | WO |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2021/092996 | 5/20/2021 | WO | A |
| Number | Name | Date | Kind |
|---|---|---|---|
| 20040108967 | Fujimura | Jun 2004 | A1 |
| 20160329642 | Chainon et al. | Nov 2016 | A1 |
| Number | Date | Country |
|---|---|---|
| 103730728 | Apr 2014 | CN |
| 103840254 | Jun 2014 | CN |
| 108400445 | Aug 2018 | CN |
| 209071594 | Jul 2019 | CN |
| 2004-120168 | Apr 2004 | JP |
| 2005229500 | Aug 2005 | JP |
| Entry |
|---|
| Jul. 29, 2020 International Search Report issued in International Patent Application No. PCT/CN2019/120096. |
| Jul. 29, 2020 Written Opinion issued in International Patent Application No. PCT/CN2019/120096. |
| Number | Date | Country | |
|---|---|---|---|
| 20220393361 A1 | Dec 2022 | US |
