Radiating element for eliminating inter-frequency common-mode harmonics

Abstract

The application belongs to the field of mobile communication technology, and provides a radiation unit for eliminating common-mode harmonic waves between different frequencies, which comprises a radiation sheet, two balun feeding plates, a support upward loading bottom plate and a feeding bottom plate, the bottom plate of the support upward loading is sleeved on the front surface of the radiation sheet, the two balun feeding plates are perpendicularly crossed and sleeved, one end of each of the two balun feeding plates is clamped on the back surface of the radiation sheet, the other end of each of the two balun feeding plates is clamped on the feeding bottom plate, the front surface of each of the two balun feeding plates is provided with a quarter wavelength balun transmission line connected with the balun transmission line on the back surface of the balun feeding plate, and the strip line on the front surface of the balun feeding plate is coupled with the strip line on the back surface of the balun feeding plate. Thus, the radiation unit for eliminating common-mode harmonic waves between different frequencies can eliminate common-mode harmonic waves between high and low frequencies, can increase a power divider, and can realize high efficiency and low cost.

Description

Technical Field

[0001] This invention relates to the field of mobile communication technology, and in particular to a radiating unit for eliminating common-mode harmonics between different frequencies. Background Technology

[0002] In recent years, to improve communication quality and meet people's increasingly diverse cultural needs, multi-network operation and site co-location have become the mainstream trend for operators. However, with the rapid increase in the number of base stations, problems such as the difficulty in selecting new site locations have become increasingly apparent. This necessitates the evolution of antennas towards miniaturization and multi-frequency, multi-mode integration. To maximize network coverage and meet the performance requirements of antennas in various frequency bands within a limited space, existing technical solutions for addressing low-frequency common-mode harmonics at high frequencies typically involve cutting a notch under the bottom reflector of the high-frequency array. This results in decreased high-frequency performance, compromises antenna integrity, and affects communication efficiency.

[0003] In the field of multi-frequency system base stations, with the rapid development of mobile communication technology, antenna size has been compressed to provide more refined antenna coverage. Nested shared aperture schemes have become mainstream. However, this has also led to increased mutual coupling between different frequencies. When high and low frequencies share a common ground plane, the common-mode harmonics of the high-frequency array cause severe distortion of the low-frequency radiation pattern, mainly manifested as: decreased gain, bandwidth divergence, and poor front-to-back ratio. Currently, in industry, the balun ground plane and reflector of the high-frequency vibrator are directly disconnected. This directly cuts off the common-mode DM current path without affecting the differential-mode CM current distribution, i.e., it does not affect the operation of the high-frequency vibrator. However, this method results in an incomplete antenna ground plane and a floating high-frequency array, making it inconvenient to add subsequent circuits such as power dividers in practical applications, greatly affecting antenna performance and manufacturability.

[0004] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the Invention

[0005] To address the aforementioned shortcomings, the present invention aims to provide a radiation unit that eliminates common-mode harmonics between different frequencies, thereby eliminating common-mode harmonics at both high and low frequencies, increasing the power divider, and achieving low cost and high efficiency.

[0006] To achieve the above objectives, the present invention provides a radiation unit for eliminating common-mode harmonics between different frequencies, comprising a radiating plate, a dual balun feed plate, an upward-loading support, and a feed base plate. The bottom of the upward-loading support is sleeved on the front side of the radiating plate. The dual balun feed plates are perpendicularly interlocked. The upper ends of the dual balun feed plates are respectively snapped onto the back side of the radiating plate, and the lower ends of the dual balun feed plates are respectively snapped onto the feed base plate. A quarter-wavelength balun transmission line is provided on the front side of the dual balun feed plates and connected to the balun transmission line on the back side of the dual balun feed plates. The strip line on the front side of the dual balun feed plates is coupled to the strip line on the back side of the dual balun feed plates.

[0007] According to the radiation unit for eliminating common-mode harmonics between different frequencies as described in the present invention, the balun feed board further includes transmission line connection points and balun feed plates.

[0008] According to the radiation unit for eliminating common-mode harmonics between different frequencies as described in the present invention, two first protrusions are respectively provided on the two symmetrical upper sides of the balun feed plate, and two second protrusions are respectively provided on the two symmetrical lower sides of the balun feed plate.

[0009] According to the radiation unit for eliminating common-mode harmonics between different frequencies as described in the present invention, the radiating sheet is provided with four centrally symmetrical first holes around its perimeter that match the upward loading of the support. The upward loading of the support is snapped and fixed to the radiating sheet through the first holes of the radiating sheet.

[0010] According to the radiation unit for eliminating common-mode harmonics between different frequencies as described in the present invention, the center position of the radiation plate is provided with a second hole that is symmetrical about four centers and matches the first protrusion of the balun feed plate.

[0011] According to the radiation unit for eliminating common-mode harmonics between different frequencies as described in the present invention, the feed base plate is provided with a third hole that is symmetrical about four centers and matches the second protrusion of the double balun feed plate.

[0012] According to the radiation unit for eliminating common-mode harmonics between different frequencies as described in the present invention, the upward loading support includes a loading plate and a loading support, wherein the loading support is fastened to the loading plate.

[0013] According to the radiation unit for eliminating common-mode harmonics between different frequencies as described in the present invention, the bottom of the loading support is a uniformly distributed four-arc support body connected to the top of the loading support.

[0014] According to the radiation unit for eliminating common-mode harmonics between different frequencies as described in the present invention, the power supply base plate is further provided with axisymmetric dual base plate transmission lines and dual base plate transmission line connection points.

[0015] According to the radiation unit for eliminating common-mode harmonics between different frequencies as described in the present invention, the radiating plate is square, rectangular or circular.

[0016] This invention provides a radiating unit for eliminating common-mode harmonics between different frequencies, comprising a radiating plate, a dual balun feed plate, an upward-loaded support, and a feed base plate. The dual balun feed plates are perpendicularly interlocked. The bottom of the upward-loaded support is fitted onto the front of the radiating plate. The upper and lower ends of the dual balun feed plates are respectively snapped onto the back of the radiating plate and the feed base plate. A quarter-wavelength balun transmission line is provided on the front of each balun feed plate, connecting to the balun transmission line on the back of the balun feed plate. The stripline on the front of the balun feed plate is coupled to the stripline on the back of the balun feed plate. Common-mode harmonics are suppressed by adjusting the transmission line parameters and stripline coupling area parameters of the front and back balun feed plates. Therefore, this invention provides a radiating unit for eliminating common-mode harmonics between different frequencies, eliminating both high and low frequency common-mode harmonics, allowing for the addition of a power divider, achieving high efficiency and low cost. Attached Figure Description

[0017] Figure 1 This is a three-dimensional view of the separation state of the radiation unit for eliminating common-mode harmonics between different frequencies provided by the present invention;

[0018] Figure 2 This is a three-dimensional structural view of the radiation unit for eliminating common-mode harmonics between different frequencies provided by the present invention;

[0019] Figure 3 This is a front view of the radiation unit for eliminating common-mode harmonics between different frequencies provided by the present invention;

[0020] Figure 4 This is a top view of the radiation unit for eliminating common-mode harmonics between different frequencies provided by the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of the radiation element for eliminating common-mode harmonics between different frequencies provided by the present invention applied to an antenna system. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0023] like Figures 1-4As shown, the present invention provides a radiating unit 100 for eliminating common-mode harmonics between different frequencies, including a radiating plate 1, a dual balun feed plate 2, an upward support 3, and a feed base plate 4. The bottom of the upward support 3 is sleeved on the front of the radiating plate 1. The dual balun feed plates 2 are perpendicularly interlocked. One end of each dual balun feed plate 2 is respectively snapped onto the back of the radiating plate 1, and the other end of each dual balun feed plate 2 is respectively snapped onto the feed base plate 4. A quarter-wavelength balun transmission line 21 is provided on the front side and connected to the balun transmission line 21 on the back side of the balun feed board 2. The strip line on the front side of the balun feed board 2 is coupled to the strip line on the back side of the balun feed board 2. By adjusting the parameters of the balun transmission line 21 on the front side of the balun feed board 2 and the balun transmission line 21 on the back side of the balun feed board 2, and by adjusting the coupling area parameters of the strip line on the front side of the balun feed board 2 and the strip line on the back side of the balun feed board 2, the common-mode harmonic suppression and self-radiation performance are optimized. The balun feed board 2 uses a half-wave array on a PCB (Printed Circuit Board) carrier. A support for upward loading 3 is provided at the top of the half-wave array, expanding the bandwidth. Furthermore, the positive and negative coupling grounding on the balun feed board 2 extends the current path of the balun, shifting the low-frequency harmonics of the high-frequency array outside the low-frequency band. This suppresses the current influence of the high-frequency array on low-frequency radiation when high and low frequencies are co-reflecting, thereby suppressing common-mode harmonics of both high and low frequencies. This allows the low-frequency array to receive a smaller high-frequency common-mode DM signal during radiation, improving the low-frequency radiation pattern. Simultaneously, it maintains high-frequency self-radiation without compromising the integrity of the reflector. In practical applications, power dividers and other circuits can be added, reducing costs and improving the efficiency of the radiation unit.

[0024] Therefore, the radiation unit 100 of the present invention for eliminating common-mode harmonics between different frequencies eliminates common-mode harmonics of high and low frequencies, can increase the power divider, and achieve high efficiency and low cost.

[0025] Preferably, the balun feed board 2 further includes a transmission line connection point 22 and a balun feed piece 23. The transmission line connection point 22 is used to connect the balun transmission line 21 on the front side of the balun feed board 2 to the balun transmission line 21 on the back side of the balun feed board 2.

[0026] Preferably, the radiating sheet 1 has four centrally symmetrical first holes 11 around its perimeter that match the upward support 3. The upward support 3 is snapped onto and fixed to the radiating sheet 1 through the first holes 11.

[0027] Preferably, the balun feed plate 2 has two first protrusions 24 on its symmetrical upper sides and two second protrusions 25 on its symmetrical lower sides. The first protrusions 24 are used to connect the balun feed plate 2 to the support upward loading 3. Specifically, the radiating plate 1 has a four-center symmetrical second hole 12 at its center position that matches the first protrusions 24 of the balun feed plate 2. The balun feed plate 2 and the radiating plate 1 are fixed by the connection between the first protrusions 24 of the balun feed plate 2 and the second holes 12 of the radiating plate 1. The second protrusions 25 are used to connect the balun feed plate 2 to the feed base plate 4. Specifically, the power supply base plate 4 is provided with a four-center symmetrical third hole 43 that matches the second protrusion 25 of the double balun power supply plate 2. The balun power supply plate 2 and the power supply base plate 4 are fixed by the sleeve of the second protrusion 25 of the balun power supply plate 2 and the third hole 43 of the power supply base plate 4.

[0028] Preferably, the upward loading support 3 includes a loading piece 31 and a loading support 32, the loading support 32 being fastened to the loading piece 31, and the loading support 32 being used to fix the upward loading support 3 onto the radiating plate 1.

[0029] Preferably, the bottom of the loading support 32 is a uniformly distributed four arc-shaped support body 321 connected to the top of the loading support 32. The bottom of the support body 321 matches the first hole 11 of the radiating plate 1. The bottom of the support body 321 is also provided with a buckle. The support body 321 is inserted into the first hole 11 of the radiating plate 1 from the front side. The buckle at the bottom of the support body 321 abuts against the back surface of the radiating plate 1 to fix the loading support 32.

[0030] Preferably, the power supply base plate 4 is further provided with an axisymmetric second base plate transmission line 41 and a second base plate transmission line connection point 42. The base plate transmission line connection point 42 is connected to the balun power supply plate 2. The base plate transmission line 41 connects the balun power supply plate 2 and the base plate transmission line 41. The base plate transmission line 41 receives low-frequency harmonics on the balun power supply plate 2, thereby suppressing high and low frequency common-mode harmonics.

[0031] Preferably, the radiating sheet 1 is square, rectangular, or circular.

[0032] In practical applications, the radiating element 100 is a component of the antenna system, such as... Figure 5The radiating element 100 is used in the antenna system, which has four radiating elements 100. The radiating element 100 adopts a half-wave array scheme with a PCB carrier. At the same time, the upper end of the half-wave array is supported and loaded to expand the bandwidth. Furthermore, the current path of the balun feed board 2 is extended by the positive and negative coupling grounding method on the balun feed board 2. This shifts the low-frequency harmonics of the high-frequency array to outside the low-frequency band, thereby suppressing the current influence of the high-frequency array on the low-frequency radiation when the high and low frequencies are in the common reflector. This allows the low-frequency array to receive a smaller high-frequency common-mode DM signal during radiation, improving the miniaturization and multi-frequency integration characteristics of the antenna system.

[0033] In summary, this invention provides a radiating unit for eliminating common-mode harmonics between different frequencies, comprising a radiating plate, a dual balun feed plate, an upward-loaded support, and a feed base plate. The dual balun feed plates are perpendicularly interlocked. The bottom of the upward-loaded support is fitted onto the front of the radiating plate. The two ends of the dual balun feed plates are respectively snapped onto the back of the radiating plate and the feed base plate. A quarter-wavelength balun transmission line is provided on the front of each balun feed plate, connecting to the balun transmission line on the back of the balun feed plate. The stripline on the front of the balun feed plate is coupled to the stripline on the back of the balun feed plate. Common-mode harmonics are suppressed by adjusting the transmission line parameters and stripline coupling area parameters of the front and back balun feed plates. Therefore, this invention provides a radiating unit for eliminating common-mode harmonics between different frequencies, eliminating both high and low frequency common-mode harmonics, allowing for the addition of a power divider, and achieving low cost and high efficiency.

[0034] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A radiating unit for eliminating common-mode harmonics between different frequencies, characterized in that, The device includes a radiating plate, a dual balun feed plate, an upward-loading support, and a feed base plate. The bottom of the upward-loading support is fitted onto the front of the radiating plate. The dual balun feed plates are perpendicularly interlocked. The upper ends of the dual balun feed plates are respectively snapped onto the back of the radiating plate, and the lower ends of the dual balun feed plates are respectively snapped onto the feed base plate. A quarter-wavelength balun transmission line is provided on the front of the dual balun feed plates and connected to the balun transmission line on the back of the dual balun feed plates. The strip line on the front of the dual balun feed plates is coupled to the strip line on the back of the dual balun feed plates. The balun feed board also includes transmission line connection points and balun feed plates; The upper two sides of the balun feed plate are respectively provided with two first protrusions, and the lower two sides of the balun feed plate are respectively provided with two second protrusions.

2. The radiation unit for eliminating common-mode harmonics between different frequencies according to claim 1, characterized in that, The radiating sheet has four centrally symmetrical first holes around its perimeter that match the upward loading of the support. The upward loading of the support is secured to the radiating sheet by snapping through the first holes.

3. The radiation unit for eliminating common-mode harmonics between different frequencies according to claim 1, characterized in that, The radiating plate has a four-center symmetrical second hole at its center, which matches the first protrusion of the balun feed plate.

4. The radiation unit for eliminating common-mode harmonics between different frequencies according to claim 1, characterized in that, The power supply base plate is provided with a third hole that is symmetrical about four centers and matches the second protrusion of the double balun power supply plate.

5. The radiation unit for eliminating common-mode harmonics between different frequencies according to claim 1, characterized in that, The upward loading support includes a loading plate and a loading support, with the loading support fastened to the loading plate.

6. The radiation unit for eliminating common-mode harmonics between different frequencies according to claim 5, characterized in that, The bottom of the loading support is a uniformly distributed quadrangular support body connected to the top of the loading support.

7. The radiation unit for eliminating common-mode harmonics between different frequencies according to claim 1, characterized in that, The power supply base plate is also equipped with an axisymmetric second base plate transmission line and a second base plate transmission line connection point.

8. The radiating unit for eliminating common-mode harmonics between different frequencies according to any one of claims 1 to 7, characterized in that, The radiating sheet can be square, rectangular, or circular.

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