Frequency selection boundary and multi-frequency array antenna

Abstract

The invention is applicable to the technical field of communication, and provides a frequency selection boundary and a multi-frequency array antenna, which comprises a reflecting plate, low-frequency radiation units, high-frequency radiation units and a frequency selection boundary, and is characterized in that the high-frequency radiation units are symmetrically distributed by taking the midpoint of the reflecting plate as the center to form a high-frequency array; the low-frequency radiation units are nested between two rows of adjacent high-frequency radiation units to form a low-frequency array, and the frequency selection boundary is arranged at the center of the reflecting plate. Therefore, according to the frequency selection boundary and the multi-frequency array antenna provided by the invention, good radiation of each frequency band of the multi-frequency antenna is ensured.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and in particular to a frequency selection boundary and multi-frequency array antenna. Background Technology

[0002] Multi-frequency antennas are playing an increasingly important role in communication development. In multi-frequency antenna design, different arrays of different frequency bands theoretically need to adopt different array boundaries. However, in multi-frequency coexistence antennas, the low-frequency array boundary inevitably affects the high-frequency array.

[0003] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the Invention

[0004] To address the aforementioned shortcomings, the present invention aims to provide a frequency selection boundary and a multi-frequency array antenna to ensure good radiation in each frequency band of the multi-frequency antenna.

[0005] To achieve the above objectives, the present invention provides a frequency selectability boundary and multi-frequency array antenna, characterized in that it includes a reflector, low-frequency radiating elements, high-frequency radiating elements, and a frequency selectability boundary. The high-frequency radiating elements are symmetrically distributed around the midpoint of the reflector to form a high-frequency array. The low-frequency radiating elements are nested between two adjacent rows of high-frequency radiating elements to form a low-frequency array. The frequency selectability boundary is located at the center of the reflector.

[0006] According to the frequency selection boundary and multi-frequency array antenna of the present invention, the frequency selection boundary includes a plurality of filter units connected in sequence.

[0007] According to the frequency selection boundary and multi-frequency array antenna of the present invention, the filtering unit includes two filtering stubs composed of high and low impedance transformation lines, and the two filtering stubs form an X-shaped extension distribution.

[0008] According to the frequency selection boundary and multi-frequency array antenna of the present invention, each end of the frequency selection boundary includes a filter stub composed of a high-low impedance transformation line.

[0009] According to the frequency selection boundary and multi-frequency array antenna of the present invention, the filtering stub includes a filter.

[0010] According to the frequency selection boundary and multi-frequency array antenna of the present invention, the length of the filter is one-quarter wavelength of the high-frequency array.

[0011] According to the frequency selection boundary and multi-frequency array antenna of the present invention, the length of the filter stub is one-quarter wavelength of the low-frequency array.

[0012] According to the frequency selection boundary and multi-frequency array antenna of the present invention, the height of the frequency selection boundary is 50mm to 80mm.

[0013] According to the frequency selection boundary and multi-frequency array antenna of the present invention, the operating frequency band of the low-frequency array is 690MHz to 960MHz, and the operating frequency band of the high-frequency array is 1710MHz to 2170MHz.

[0014] According to the frequency selection boundary and multi-frequency array antenna of the present invention, the spacing between two adjacent rows of low-frequency radiating elements is 210mm to 250mm, and the spacing between two adjacent rows of high-frequency radiating elements is 110mm to 140mm.

[0015] This invention utilizes a frequency selectivity boundary and multi-frequency array antenna, comprising a reflector, high-frequency radiating elements symmetrically arranged around the midpoint of the reflector to form a high-frequency array, and low-frequency radiating elements nested between two adjacent rows of high-frequency radiating elements to form a low-frequency array. A frequency selectivity boundary is positioned at the center of the reflector, allowing high frequencies to pass while blocking low frequencies, thus providing frequency selection. Therefore, this frequency selectivity boundary and multi-frequency array antenna ensures good radiation across all frequency bands of the multi-frequency antenna. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the frequency selection boundary and multi-frequency array antenna provided by the present invention;

[0017] Figure 2 This is a schematic diagram of the structure of the frequency selection boundary and the frequency selection boundary of the multi-frequency array antenna provided by the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of the filtering unit for the frequency selection boundary and multi-frequency array antenna provided by the present invention;

[0019] Figure 4 This is a schematic diagram of the structure of the frequency selection boundary and the filtering stub of the multi-frequency array antenna provided by the present invention;

[0020] Figure 5 This is a schematic diagram illustrating the radiation suppression effect of the frequency selection boundary and the filtering unit of the multi-frequency array antenna provided by the present invention;

[0021] Figure 6 This is a simulation diagram of the low-frequency array radiation performance of the frequency selection boundary and multi-frequency array antenna provided by the present invention;

[0022] Figure 7 This is a simulation diagram of the high-frequency array radiation performance of the frequency selection boundary and multi-frequency array antenna provided by the present invention;

[0023] Figure 8This is a simulation diagram of the high-frequency array radiation performance when using traditional metal boundaries. Detailed Implementation

[0024] 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.

[0025] like Figure 1 As shown, this invention provides a frequency selectability boundary and multi-frequency array antenna 100, including a reflector 1, low-frequency radiating elements 2, high-frequency radiating elements 3, and a frequency selectability boundary 4. The high-frequency radiating elements 3 are symmetrically distributed around the midpoint of the reflector 1 to form a high-frequency array. The low-frequency radiating elements 2 are nested between two adjacent rows of high-frequency radiating elements 3 to form a low-frequency array. The two adjacent rows of high-frequency radiating elements 3 are symmetrically distributed around the center of the low-frequency radiating elements 2. In this embodiment, the high-frequency array includes four rows of high-frequency radiating elements 3, and the low-frequency array includes two rows of low-frequency radiating elements 2. The frequency selectability boundary 4 is located at the center of the reflector 1, and its length is set according to the lengths of the corresponding high-frequency and low-frequency arrays. The frequency selectability boundary 4 is used to pass high frequencies and block low frequencies. The filtering unit 4 in the frequency selectability boundary 4... 1. To allow low frequencies and block high frequencies, the low-frequency coupling current will form parasitic radiation in the low-frequency band. This suppresses the low-frequency signal from passing through the frequency selection boundary 4, thereby suppressing the parasitic radiation generated by the high-frequency coupling current, reducing the impact on the radiation performance of the high-frequency radiation unit 3, avoiding distortion of the radiation pattern of the high-frequency radiation unit 3, and achieving a transmission effect in the radiation pattern of the high-frequency radiation unit 3. The filter branch 42 of the filter unit 41 is adjusted according to specific needs to achieve good transmission of the low-frequency coupling current, forming parasitic radiation of the low-frequency coupling current, and suppressing the low-frequency signal from passing through the frequency selection boundary 4. The filter 43 of the filter branch 42 is adjusted according to specific effects. Specifically, the line length, line width, and line spacing of the filter 43 are adjusted to suppress the parasitic radiation of the high-frequency coupling current and reduce the impact of the frequency selection boundary 4 on the radiation performance of the high-frequency radiation unit 3.

[0026] Preferably, such as Figure 2As shown, the frequency selection boundary 4 includes multiple filter units 41 connected in sequence to achieve high-frequency pass-through and low-frequency block-through. The filter branches 42 of the filter unit 41 are adjusted according to specific needs to achieve good transmission of low-frequency coupled current, forming parasitic radiation of low-frequency coupled current, and suppressing low-frequency signals from passing through the frequency selection boundary 4. The filter 43 of the filter branch 42 is adjusted according to specific effects, specifically adjusting the line length, line width and line spacing of the filter 43 to suppress parasitic radiation of high-frequency coupled current and reduce the influence of the frequency selection boundary 4 on the radiation performance of the high-frequency radiation unit 3. Preferably, the frequency selection boundary 4 is a PCB board, which can reduce the attenuation of high-frequency signals, improve the anti-interference ability of the circuit and optimize the circuit performance.

[0027] Preferably, such as Figures 3-5 As shown, the filter unit 41 includes two filter stubs 42 composed of high-low impedance transformation lines. The two filter stubs 42 form an X-shaped extension distribution, realizing the filtering unit 41's ability to pass low frequencies and block high frequencies. Figure 5 As shown, the low-frequency array has attenuation capability in the low-frequency band of 690MHz to 960MHz. The low-frequency coupling current forms parasitic radiation in the low-frequency band, suppressing the low-frequency signal from passing through the frequency selection boundary 4, thereby suppressing the parasitic radiation generated by the high-frequency coupling current and realizing that the radiation pattern of the high-frequency radiation unit 3 has a transmission effect.

[0028] Preferably, each end of the frequency selection boundary 4 includes a filter stub 42 composed of high-low impedance transformation lines. When space is insufficient, each end of the frequency selection boundary 4 can be connected to a filter stub 42 composed of high-low impedance transformation lines.

[0029] Preferably, such as Figure 4 As shown, the filter stub 42 includes a filter 43, which is adjusted according to the specific effect to suppress parasitic radiation of high-frequency coupled current and reduce the influence of frequency selection boundary 4 on the radiation performance of high-frequency radiation unit 3.

[0030] Preferably, the length of the filter 43 is one-quarter wavelength of the high-frequency array. The filter 43 is adjusted according to the specific effect, specifically by adjusting the line length, line width and line spacing of the filter 43 to suppress parasitic radiation of high-frequency coupling current and reduce the influence of the frequency selection boundary 4 on the radiation performance of the high-frequency radiation unit 3.

[0031] Preferably, the length of the filter stub 42 is one-quarter of the wavelength of the low-frequency array. The filter stub 42 is adjusted according to specific needs to achieve good transmission of the low-frequency coupled current, form parasitic radiation of the low-frequency coupled current, and suppress the low-frequency signal from passing through the frequency selection boundary 4.

[0032] Preferably, the height of the frequency selection boundary 4 is 50mm to 80mm.

[0033] Preferably, the low-frequency array operates in the frequency band of 690MHz to 960MHz, and the high-frequency array operates in the frequency band of 1710MHz to 2170MHz.

[0034] Preferably, the spacing between two adjacent rows of low-frequency radiation units 2 is 210mm to 250mm, and the spacing between two adjacent rows of high-frequency radiation units 3 is 110mm to 140mm.

[0035] In practical applications, Figure 6 The simulation diagram shows the radiation performance of the low-frequency array of the multi-frequency array antenna 100 at the frequency selection boundary, with a smooth radiation arc. Figure 7 The diagram shows a simulation of the high-frequency array radiation performance of the multi-frequency array antenna 100, with respect to the frequency selection boundary. Figure 8 This diagram illustrates a simulation of the high-frequency array radiation performance using conventional metallic boundaries. Figure 7 relatively Figure 8 Without waveform distortion, the radial arc is relatively smoother.

[0036] In summary, this invention provides a frequency selectivity boundary and multi-frequency array antenna, comprising a reflector, high-frequency radiating elements symmetrically arranged around the midpoint of the reflector to form a high-frequency array, and low-frequency radiating elements nested between two adjacent rows of high-frequency radiating elements to form a low-frequency array. A frequency selectivity boundary is set at the center of the reflector, allowing high frequencies to pass while blocking low frequencies, thus providing a frequency selectivity effect. Therefore, this invention's frequency selectivity boundary and multi-frequency array antenna ensures good radiation across all frequency bands of the multi-frequency antenna.

[0037] 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 frequency selectivity boundary and multi-frequency array antenna, characterized in that, It includes a reflector, low-frequency radiation units, high-frequency radiation units, and a frequency selection boundary. The high-frequency radiation units are symmetrically distributed around the midpoint of the reflector to form a high-frequency array. The low-frequency radiation units are nested between two adjacent rows of high-frequency radiation units to form a low-frequency array. The frequency selection boundary is located at the center of the reflector.

2. The frequency selection boundary and multi-frequency array antenna according to claim 1, characterized in that, The frequency selection boundary comprises multiple filter units connected in sequence.

3. The frequency selection boundary and multi-frequency array antenna according to claim 2, characterized in that, The filtering unit includes two filtering branches composed of high and low impedance conversion lines, and the two filtering branches are distributed in an X-shaped extension.

4. The frequency selection boundary and multi-frequency array antenna according to claim 2, characterized in that, The frequency selection boundary has a filter stub composed of high and low impedance transformation lines at each end.

5. The frequency selection boundary and multi-frequency array antenna according to claim 3 or 4, characterized in that, The filtering stub includes a filter.

6. The frequency selection boundary and multi-frequency array antenna according to claim 5, characterized in that, The length of the filter is one-quarter of the wavelength of the high-frequency array.

7. The frequency selection boundary and multi-frequency array antenna according to claim 3 or 4, characterized in that, The length of the filter stub is one-quarter of the wavelength of the low-frequency array.

8. The frequency selection boundary and multi-frequency array antenna according to claim 1, characterized in that, The height of the frequency selection boundary is 50mm to 80mm.

9. The frequency selection boundary and multi-frequency array antenna according to claim 1, characterized in that, The low-frequency array operates in the frequency band of 690MHz to 960MHz, and the high-frequency array operates in the frequency band of 1710MHz to 2170MHz.

10. The frequency selection boundary and multi-frequency array antenna according to claim 1, characterized in that, The spacing between two adjacent rows of low-frequency radiating units is 210mm to 250mm, and the spacing between two adjacent rows of high-frequency radiating units is 110mm to 140mm.

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