A broadband dual-frequency fusion antenna array based on upright oscillators

Abstract

The present invention discloses a broadband dual-frequency fusion antenna array based on upright oscillators, including a reflector, a metal tube, a low-frequency antenna and a high-frequency antenna, wherein the low-frequency antenna and the high-frequency antenna are both vertically arranged above the reflector, and the high-frequency antenna is four and arranged around the low-frequency antenna and symmetrically about the central axis of the low-frequency antenna, and the metal tube is arranged on the reflector. The broadband base station antenna array enables base station antennas operating in different frequency bands to share an antenna radiation aperture, eliminate mutual interference, and realize the fusion of two base station antennas operating in the frequency bands of 690-960MHz and 1700-2700MHz.

Description

Technical Field

[0001] The present invention relates to the field of mobile communications, and in particular to a broadband dual-frequency fusion antenna array based on upright oscillators. Background Art

[0002] With the rapid development of mobile communication technology, the development and utilization of new frequency bands are particularly important. As an important part of the mobile communication system, the base station antenna is the gateway for mobile terminals such as mobile phones to communicate directly with the base station, and is also an important carrier for wireless communication systems to implement technologies such as frequency reuse and diversity reception. At present, there are GSM, 2G, 3G, and LTE (4G) systems in China. The GSM900 system uses 890-960MHz, the CDMA800 system uses 825-880MHz, the 2G system uses 1710-1550MHz, the 3G system uses the frequency band 1550-2170MHz, and the LTE (4G) system uses 2300-2640MHz. China's wireless communication system currently covers the 825-960MHz and 1710-2640MHz frequency bands. With the development of mobile communication technology, different mobile systems occupy different frequency bands. It is difficult to achieve a bandwidth of 890-2640MHz on one antenna. The deployment of base station antennas will become a difficult point. If two base station antennas of different frequency bands can still work normally without being affected by each other when they are close to each other, it will increase space utilization, increase economic benefits, and have greater value. Therefore, the newly designed and installed array antenna covers 690-960MHz and 1710-2640MHz at the same time and supports different mobile communication systems to achieve greater economic benefits.

[0003] At present, broadband base station antennas can generally cover the bandwidth of 2G, 3G, and LTE (4G) systems, but do not have the bandwidth to cover the GSM system. If one antenna can work in multiple communication systems, the number of antennas can be reduced, the communication equipment can be miniaturized, and the deployment of base station antennas can be facilitated. Summary of the invention

[0004] In order to overcome the shortcomings and deficiencies of the prior art, the present invention provides a broadband dual-frequency fusion antenna array based on upright oscillators.

[0005] The present invention is an array composed of two different antenna elements, which has high radiation gain and stable directional pattern. The broadband base station antenna array can enable base station antennas working in different frequency bands to share an antenna radiation aperture, eliminate mutual interference, and realize the fusion of two base station antennas working in the frequency bands of 690-960MHz and 1700-2700MHz.

[0006] The present invention adopts the following technical solution:

[0007] A broadband dual-frequency fusion antenna array based on an upright oscillator includes a reflector, a metal tube, a low-frequency antenna and a high-frequency antenna. The low-frequency antenna and the high-frequency antenna are both vertically arranged above the reflector. There are four high-frequency antennas, which are arranged around the low-frequency antenna and symmetrically about the central axis of the low-frequency antenna. The metal tube is arranged on the reflector.

[0008] Furthermore, the low-frequency antenna includes a low-frequency dielectric substrate, which includes a first low-frequency dielectric substrate and a second low-frequency dielectric substrate that are cross-shaped, a first low-frequency radiating element and a second low-frequency radiating element are printed on the front side of the first low-frequency dielectric substrate and the front side of the second low-frequency dielectric substrate, respectively, a first low-frequency feed line and a second low-frequency feed line are arranged on the back side of the first low-frequency dielectric substrate and the back side of the second low-frequency dielectric substrate, respectively, the first low-frequency radiating element is a +45-degree polarized element, fed by the first low-frequency feed line, the second low-frequency radiating element is a -45-degree polarized element, fed by the second low-frequency feed line, each low-frequency radiating element includes two element arms, each element arm is truncated by two metal circles at a distance from each other, and a choke ring structure is printed on the back side of the low-frequency dielectric substrate corresponding to the metal circle.

[0009] Furthermore, the choke ring structure includes two arc-shaped metal sheets arranged opposite to each other, and the two arc-shaped metal sheets are connected through a metal strip.

[0010] Furthermore, the four high-frequency antennas have the same structural dimensions and all include a high-frequency dielectric substrate and a high-frequency feed line. A high-frequency radiation vibrator is arranged on the front side of the high-frequency dielectric substrate, and a high-frequency feed line is arranged on the back side. The high-frequency dielectric substrate includes a first high-frequency dielectric substrate and a second high-frequency dielectric substrate that are cross-shaped. The high-frequency feed line includes a first high-frequency feed line and a second high-frequency feed line. The first high-frequency radiation vibrator is a +45-degree polarization vibrator fed by the first high-frequency feed line, and the second high-frequency radiation vibrator is a -45-degree polarization vibrator fed by the second high-frequency feed line.

[0011] Furthermore, the diameter of the metal cylinder is 150 mm and the height is 25 mm.

[0012] Furthermore, the distance between the reflector and the top of the low-frequency antenna is 0.1λ L -0.5λ L , where λ L It is the wavelength corresponding to the center frequency of 0.83 GHz of the broadband base station antenna in free space.

[0013] Furthermore, the distance between the reflector and the top of the high-frequency antenna is 0.1λ L -0.5λ L , where λ L It is the wavelength corresponding to the center frequency 2.20 GHz of the broadband base station antenna in free space.

[0014] Furthermore, the high-frequency antenna and the low-frequency antenna are both arranged upright.

[0015] Furthermore, the longitudinal distance between the low-frequency antenna and each high-frequency antenna unit is 57.5 mm, and the lateral distance is 62.5 mm.

[0016] Furthermore, the height of the high-frequency dielectric substrate is smaller than that of the low-frequency dielectric substrate.

[0017] Beneficial effects of the present invention:

[0018] (1) The bandwidth of the present invention completely covers 690-960 MHz and 1700-2700 MHz, and is applicable not only to 2G / 3G / LTE (4G) systems but also to GSM systems;

[0019] (2) The low-frequency choke technology feature adopted by the present invention solves the coupling problem between antenna arrays;

[0020] (3) The radiator of the present invention has a novel structure, a stable radiation pattern and a high gain. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention

[0022] Figure 2 is a front view of the present invention;

[0023] Figure 3 is a schematic diagram of a high frequency antenna of the present invention;

[0024] Figure 4 is a schematic diagram of a low-frequency antenna of the present invention;

[0025] FIG5( a ) is a low frequency reflection coefficient of an embodiment of the present invention;

[0026] FIG. 5( b ) is a diagram showing the high frequency reflection coefficient of an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0028] Example

[0029] like Figure 1-Figure 4As shown, a broadband dual-frequency fusion antenna array based on upright oscillators includes a low-frequency antenna 1 with an operating frequency band of 690-960 MHz, four high-frequency antennas 2 with an operating frequency band of 1700-2700 MHz, a reflector 3 and a metal tube 4. The high-frequency antennas of the antenna array are arranged around the low-frequency antenna and are symmetrical about the center of the low-frequency antenna. They are divided into two columns, with two antennas in each column. The lateral distance between the central axis of the high-frequency antenna and the low-frequency antenna is 62.5 mm, and the longitudinal distance is 57.5 mm. The high-frequency antenna and the low-frequency antenna are both supported on the reflector by a dielectric substrate and are both fed by a balun feeder. The metal tube is upright above the reflector, located on the periphery of the high-frequency antenna, and is symmetrical about the center of the low-frequency antenna.

[0030] The low-frequency antenna includes a low-frequency dielectric substrate, which includes a first low-frequency dielectric substrate 8A and a second low-frequency dielectric substrate 8B that are cross-shaped. The front of the first low-frequency dielectric substrate and the front of the second low-frequency dielectric substrate are respectively printed with a first low-frequency radiation vibrator 1A and a second low-frequency radiation vibrator 1B. The back of the first low-frequency dielectric substrate and the back of the second low-frequency dielectric substrate are respectively provided with a first low-frequency feed line 6A and a second low-frequency feed line 6B. The first low-frequency radiation vibrator is a +45-degree polarized vibrator fed by the first low-frequency feed line, and the second low-frequency radiation vibrator is a -45-degree polarized vibrator fed by the second low-frequency feed line. Each low-frequency radiation vibrator arm is truncated by two metal circles at a distance apart, and a choke ring structure is printed at the back of the low-frequency dielectric substrate corresponding to the metal circle.

[0031] That is to say, the first low-frequency radiating element and the second low-frequency radiating element are respectively provided with four choke ring structures, and the four choke ring structures on each radiating element are symmetrical about the axis of the low-frequency antenna. The antenna array is suitable for large-scale MIMO array.

[0032] The low-frequency radiation vibrator includes two vibrator arms, each of which is cut off by two metal circles, and a choke ring structure is printed on the front and back of the low-frequency dielectric substrate at the cut-off position. The first low-frequency radiation vibrator and the second low-frequency radiation vibrator have exactly the same structure and size.

[0033] The choke ring structure includes two arc-shaped metal sheets 5A and 5B arranged opposite to each other. The two arc-shaped metal sheets are connected by a metal strip. The distance between the two choke rings is about 0.25λ. L This structure has a filtering function, which greatly reduces the high-frequency coupling current on the low-frequency oscillator.

[0034] The four high-frequency antennas have the same structural dimensions and all include a high-frequency dielectric substrate and a high-frequency feed line. A high-frequency radiation vibrator is arranged on the front side of the high-frequency dielectric substrate, and a high-frequency feed line is arranged on the back side. The high-frequency dielectric substrate includes a first high-frequency dielectric substrate 10A and a second high-frequency dielectric substrate 10B that are cross-shaped. The high-frequency feed line includes a first high-frequency feed line 7A and a second high-frequency feed line 7B. The first high-frequency radiation vibrator 2A is a +45-degree polarization vibrator fed by the first high-frequency feed line, and the second high-frequency radiation vibrator 2B is a -45-degree polarization vibrator fed by the second high-frequency feed line.

[0035] The height of the high-frequency dielectric substrate is smaller than that of the low-frequency dielectric substrate. Both the high-frequency dielectric substrate and the low-frequency dielectric substrate are T-shaped plates, and the central axis positions of the two T-shaped plates are cross-intersected, and the left and right parts are symmetrical about the central axis.

[0036] The low-frequency antenna is an upright structure, which can achieve a dual-polarization bandwidth of 690-960 MHz and a return loss greater than 15 dB.

[0037] The first low-frequency feed line and the second low-frequency feed line are perpendicular to each other and intersect at the central axis of the low-frequency dielectric substrate.

[0038] The high-frequency antenna is an upright structure, which can achieve a dual-polarization bandwidth of 1700-2700 MHz and a return loss greater than 15 dB.

[0039] The maximum diameter of the metal cylinder is 150 mm and the height is 25 mm.

[0040] The distance between the reflector and the top of the low-frequency antenna is 0.1λ L -0.5λ L , where λ L It is the wavelength corresponding to the center frequency of 0.83 GHz of the broadband base station antenna in free space.

[0041] The distance between the reflector and the top of the high-frequency antenna is 0.1λ L -0.5λ L , where λ L It is the wavelength corresponding to the center frequency 2.20 GHz of the broadband base station antenna in free space.

[0042] The dielectric substrate of the low-frequency antenna is made of high-frequency plate material R04350B, with a thickness of 1.52 mm and a relative dielectric constant of 3.48.

[0043] The dielectric substrate of the high-frequency antenna is made of high-frequency plate material R04350B, with a thickness of 0.76 mm and a relative dielectric constant of 3.48.

[0044] As shown in FIG. 5( a ) and FIG. 5( b ), the low frequency can work normally through the low frequency reflection coefficient and the high frequency reflection coefficient.

[0045] The vertical array broadband dual-frequency fusion base station antenna array has the characteristics of novel structure, large bandwidth, high isolation, stable radiation pattern, high gain, etc.

[0046] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A broadband dual-frequency fusion antenna array based on an upright oscillator, characterized in that: It includes a reflector, a metal tube, a low-frequency antenna and a high-frequency antenna. The low-frequency antenna and the high-frequency antenna are both vertically arranged above the reflector. There are four high-frequency antennas, which are arranged around the low-frequency antenna and symmetrically about the central axis of the low-frequency antenna. The metal tube is arranged on the reflector. The low-frequency antenna comprises a low-frequency dielectric substrate, the low-frequency dielectric substrate comprises a first low-frequency dielectric substrate and a second low-frequency dielectric substrate which are cross-shaped, a first low-frequency radiating element and a second low-frequency radiating element are printed on the front of the first low-frequency dielectric substrate and the front of the second low-frequency dielectric substrate respectively, a first low-frequency feed line and a second low-frequency feed line are arranged on the back of the first low-frequency dielectric substrate and the back of the second low-frequency dielectric substrate respectively, the first low-frequency radiating element is a +45-degree polarized element fed by the first low-frequency feed line, the second low-frequency radiating element is a -45-degree polarized element fed by the second low-frequency feed line, each low-frequency radiating element comprises two radiator arms, each radiator arm is truncated by two metal circles, and a choke ring structure is printed on the back of the low-frequency dielectric substrate corresponding to the metal circle; The distance between the reflector and the top of the low-frequency antenna is 0.1λ L -0.5λ L , where λ L It is the wavelength corresponding to the center frequency of the broadband base station antenna 0.83GHz in free space.

2. The broadband dual-frequency fusion antenna array according to claim 1, characterized in that: The choke ring structure includes two arc-shaped metal sheets arranged opposite to each other, and the two arc-shaped metal sheets are connected through a metal strip.

3. The broadband dual-frequency fusion antenna array according to claim 1, characterized in that: The four high-frequency antennas have the same structural dimensions and all include a high-frequency dielectric substrate and a high-frequency feed line. A high-frequency radiation vibrator is arranged on the front side of the high-frequency dielectric substrate, and a high-frequency feed line is arranged on the back side. The high-frequency dielectric substrate includes a first high-frequency dielectric substrate and a second high-frequency dielectric substrate that are cross-shaped. The high-frequency radiation vibrator includes a first high-frequency radiation vibrator and a second high-frequency radiation vibrator. The high-frequency feed line includes a first high-frequency feed line and a second high-frequency feed line. The first high-frequency radiation vibrator is a +45-degree polarization vibrator fed by the first high-frequency feed line, and the second high-frequency radiation vibrator is a -45-degree polarization vibrator fed by the second high-frequency feed line.

4. The broadband dual-frequency fusion antenna array according to claim 1, characterized in that: The metal cylinder has a diameter of 150 mm and a height of 25 mm.

5. The broadband dual-frequency fusion antenna array according to claim 1, characterized in that: The distance between the reflector and the top of the high-frequency antenna is 0.1λ H -0.5λ H , where λ H It is the wavelength corresponding to the center frequency of 2.20 GHz of the broadband base station antenna in free space.

6. The broadband dual-frequency fusion antenna array according to claim 1, characterized in that: The longitudinal distance between the low-frequency antenna and each high-frequency antenna unit is 57.5 mm, and the lateral distance is 62.5 mm.

7. The broadband dual-frequency fusion antenna array according to claim 3, characterized in that: The height of the high-frequency dielectric substrate is smaller than that of the low-frequency dielectric substrate.

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