CN210926303U - Miniaturized ultra-wideband low-frequency radiation unit and high-low frequency nested array - Google Patents
Miniaturized ultra-wideband low-frequency radiation unit and high-low frequency nested array Download PDFInfo
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- CN210926303U CN210926303U CN201922198698.3U CN201922198698U CN210926303U CN 210926303 U CN210926303 U CN 210926303U CN 201922198698 U CN201922198698 U CN 201922198698U CN 210926303 U CN210926303 U CN 210926303U
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Abstract
The utility model discloses a miniaturized ultra wide band low frequency radiation unit is applied to the nested array of high low frequency, and this low frequency radiation unit comprises the monopole radiation electric arm of disconnection in the middle of four groups and the panel beating balun of upper and lower stromatolite windowing, loading coupling sheetmetal between two adjacent monopole radiation electric arms. The pair of monopole radiating arms which are diagonal to each other have the same polarization direction, 75 omega radio frequency cables with the same length are welded at the feed point, and two 75 omega cables in the same polarization direction are welded together through the feed slot and then connected with a 50 omega feed line for excitation. The utility model has the advantages of small size, light weight, ultra wide band, simple matching and low cost. The utility model also provides a nested array of high low frequency.
Description
Technical Field
The patent of the utility model relates to a base station antenna field especially relates to a miniaturized ultra wide band low frequency radiating element in coaxial nested space multiplexing array and the nested array of high low frequency that constitutes of using above-mentioned low frequency radiating element.
Background
The arrival of 5G has placed higher demands on the miniaturization and integration of base station antennas. The high-low frequency radiation unit coaxial nested spatial multiplexing array is widely applied in the industry as a relatively mature technology for reducing the size of a base station antenna and improving the integration level, and is one of the main methods for solving the problems of miniaturization and integration at present.
The coaxial nested spatial multiplexing array of the high-frequency and low-frequency radiating units is characterized in that the high-frequency radiating units are arranged at intervals on a supporting platform above a central shaft of the low-frequency radiating unit and in the middle positions of adjacent array elements of the low-frequency linear array, and the high-frequency and low-frequency arrays are integrated on the premise of not increasing the physical size of a base station antenna by a mode of multiplexing the low-frequency array space by the high-frequency array. The above scheme faces two technical challenges: 1) interaction between the high frequency radiating element and the low frequency radiating element. For the low-frequency radiating element, the high-frequency radiating element is arranged nearby, particularly on the central axis in the low-frequency radiating element, which is equivalent to changing the boundary and inevitably influencing the standing wave and the directional diagram; however, for the high-frequency radiating element, whether the nested high-frequency oscillator is positioned on the central saddle of the low-frequency radiating element or the external high-frequency oscillator is positioned in the middle of the adjacent low-frequency radiating element, the influence of stray waves from the low-frequency oscillator is inevitable. 2) And (3) maintaining the ultra-wideband characteristic of the high-frequency and low-frequency nested array. It is not difficult to see from the layout of the co-axial nested arrays-the cell pitch of the high frequency array is half that of the low frequency array. To ensure that the vertical plane sidelobe suppression is achieved, the lower limit of the high frequency operating frequency is at most twice the upper limit of the low frequency operating frequency, which also means that the low frequency nested unit aperture plane cannot be too large! How to realize low-frequency impedance matching and higher gain through a smaller aperture becomes a key problem to be solved urgently in the design of the low-frequency nested radiating unit.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a miniaturized low frequency radiation unit that the orofacial features is little, highly low, ultra wide band, high gain.
The utility model also provides a nested array of high low frequency that has above-mentioned low frequency radiating element.
In order to achieve the above purpose, the utility model adopts the following technical scheme.
The utility model provides a miniaturized ultra wide band low frequency radiating element, is applied to high low frequency nested array which characterized in that: a coupling metal sheet is loaded between two adjacent monopole radiating arms with the low-frequency radiating units disconnected, and windows are formed in the metal plate balun in an up-and-down laminated mode, so that a current path is optimized, multimode resonance is tuned, and low-frequency bandwidth is expanded while the small size is kept.
More preferably, the low-frequency radiating unit comprises a frame structure and a supporting platform which is arranged above a central axis of the frame structure and provided with an upward flange, the frame structure and the supporting platform are both made of aluminum, and the height of the supporting platform from the bottom of the frame structure is 1/4 high-frequency oscillator central frequency wavelength.
More preferably, the height of the supporting platform from the bottom of the frame structure is 30-35 mm.
More preferably, the frame structure is a hollow quadrangular frustum pyramid frame piece formed by bending an aluminum plate; the four monopole radiating arms are respectively composed of an open window edge and radiating arms positioned on two sides of the edge, and the coupling metal sheet is arranged between the radiating arms of two adjacent monopole radiating arms; the metal plate balun is composed of hollowed-out side plates.
More preferably, the monopole radiating arms which are diagonal to each other have the same polarization direction, and a pair of the monopole radiating arms in the same polarization direction are welded with equal-length 75 Ω radio frequency cables at a feed point and are welded together with a 50 Ω feed line through a feed slot.
More preferably, the working frequency of the low-frequency radiation unit is 698-960 MHz.
A high and low frequency nested array comprising: the reflecting plate is provided with a plurality of high-frequency radiating units and a plurality of low-frequency radiating units, the high-frequency radiating units are arranged on the reflecting plate in an array mode, and the high-frequency radiating units are arranged above the central axis of the low-frequency radiating unit at intervals and in the middle position of the adjacent low-frequency radiating unit; wherein the low frequency radiating element is as described above.
More preferably, the distance between two adjacent low-frequency radiation units is 250-270 mm.
More preferably, a high frequency boundary plate is provided on the reflection plate, the high frequency boundary plate corresponding to the high frequency radiation unit installed at a middle position of the adjacent low frequency radiation unit.
More preferably, a director is provided above the high frequency radiating element installed at a middle position of the adjacent low frequency radiating elements.
In order to reduce the size and extend the low frequency bandwidth, the low frequency oscillator with the disconnection of above-mentioned four group's radiation electric arms from the center, through locating loading metallic coupling piece extension current path at the gap, improve the low frequency and match.
The utility model has the advantages that:
the method comprises the steps that a coupling metal sheet is loaded between two adjacent monopole radiating arms disconnected by a low-frequency radiating unit, and a window is opened on a metal plate balun in an up-down stacking mode, so that a current path is optimized, multimode resonance is tuned, low-frequency bandwidth is expanded while a small size is kept, and the low-frequency radiating unit is small in opening surface, low in height, light in weight, large in bandwidth, high in gain and easy to process.
The four monopole radiating arms are adopted, and the monopole radiating arms which are opposite to each other have the same polarization direction, so that the matching is simple, and a PCB (printed circuit board) matching circuit or a transformation section is not required; the +/-45-degree polarization is respectively connected with two 75-omega radio frequency cables at the corresponding electric arms, and the cables can be matched with 50 omega after being welded together through the feed slots.
Drawings
Fig. 1 is a schematic structural diagram of a miniaturized ultra-wideband low-frequency radiating unit according to the present invention.
Fig. 2 is a schematic diagram of the feed network connection of the miniaturized ultra-wideband low-frequency radiating unit according to the present invention.
Fig. 3 is a schematic diagram of the structure of the high-low frequency nested array according to the present invention.
Fig. 4 shows the measurement result of the standing wave of the miniaturized ultra-wideband low-radiation unit of the present invention.
Fig. 5 shows the measurement result of the directional diagram of the miniaturized ultra-wideband low-radiation unit of the present invention.
Description of reference numerals:
1: low-frequency radiating element, 1-1: frame structure, 1-2: pallet, 1-1-1: monopole radiation electric arm, 1-1-2: metal plate balun, 1-3: coupling metal sheet, 1-4: 75 Ω radio frequency cable, 1-5: a feed slot.
2: high-frequency radiation unit, 2-1: nested high-frequency oscillator, 2-2: an external high-frequency oscillator.
3: a high frequency boundary plate.
4: a director.
5: a reflective plate.
Detailed Description
In the description of the present invention, it should be noted that, for the orientation words, if there are terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the orientation and positional relationship indicated are based on the orientation or positional relationship shown in the drawings, and only for the convenience of describing the present invention and simplifying the description, it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and not be construed as limiting the specific scope of the present invention.
Furthermore, if the terms "first" and "second" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, the definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the features, and in the description of the invention, "at least" means one or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "assembled", "connected", and "connected", if any, are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; or may be a mechanical connection; the two elements can be directly connected or connected through an intermediate medium, and the two elements can be communicated with each other. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
In the present application, unless otherwise specified or limited, "above" or "below" a first feature may include the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other through another feature therebetween. Also, the first feature being "above," "below," and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply an elevation which indicates a level of the first feature being higher than an elevation of the second feature. The first feature being "above", "below" and "beneath" the second feature includes the first feature being directly below or obliquely below the second feature, or merely means that the first feature is at a lower level than the second feature.
The following description will be further made in conjunction with the accompanying drawings of the specification, so that the technical solution and the advantages of the present invention are clearer and clearer. The embodiments described below are exemplary and are intended to be illustrative of the present invention, but should not be construed as limiting the invention.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
As shown in fig. 1 and 2, a miniaturized ultra-wideband low-frequency radiating unit 1 includes a frame structure 1-1 and a saddle 1-2 with an upward flange, which is arranged above a central axis of the frame structure 1-1.
The frame structure 1-1 is a hollow prismoid-shaped frame piece which is formed by bending an aluminum plate and is small in bottom and large in top, four monopole radiation electric arms 1-1-1 and corresponding metal plate barrons 1-1-2 are formed on the frame piece, each monopole radiation electric arm 1-1-1 is respectively composed of a windowing edge and radiation arms positioned on two sides of the windowing edge, and the metal plate barrons 1-1-2 are composed of hollowed-out side plates.
The pallet 1-2 is an aluminum pallet and is used for installing and nesting the high-frequency radiation unit. The height of the supporting platform 1-2 from the bottom of the frame structure 1-1 is about 1/4 center frequency wavelength of the high-frequency oscillator, and the recommended height is 30-35 mm, so that the high-frequency gain is improved, and the matching of the low-frequency oscillator is facilitated.
In order to expand the low frequency bandwidth while maintaining a small size, the present embodiment employs two main technical approaches: 1) the monopole radiation electric arm 1-1-1 is disconnected from the middle, the length of a gap is about 2-5 mm, and a coupling metal sheet 1-3 is loaded at the gap. The benefits of this arrangement are: on one hand, the low-frequency current path is prolonged to improve the radiation resistance, and on the other hand, the resonant frequency is tuned through the parasitic capacitance. 2) The side plates of the frame structure 1-1 are laminated and windowed, namely, the side plates are hollowed into an upper layer and a lower layer, and the radiation current is adjusted through the metal plate cross bar between the two layers of windowed layers to enable the mode conversion to be smoother, so that the mismatch caused by discontinuous current change is reduced.
Preferably, a pair of monopole radiating arms 1-1-1 which are opposite to each other have the same polarization direction, 75 Ω radio frequency cables 1-4 with the same length are welded at a feed point, two 75 Ω radio frequency cables 1-4 in the same polarization direction are welded together through a feed slot 1-5 and then connected with a 50 Ω feed line for excitation, a matching section or a complicated printed circuit board is not needed, the assembly and welding operation steps are simplified, and the cost is reduced. The length of the 75 omega radio frequency cable can be adjusted according to the working frequency of the low-frequency radiation unit, the caliber of a radiation surface and the height of the balun, so that the impedance matching is optimal.
In this embodiment, the operating frequency of the low-frequency radiating unit is 698-960 MHz, the size of the mouth surface (the top of the frustum of a pyramid) is 147mm × 147mm, the height of the vibrator is 76mm, and the length of the used 75 Ω cable is 250 mm.
As shown in fig. 3, the high-frequency and low-frequency nested array using the low-frequency radiating elements includes a reflecting plate 5, a plurality of high-frequency radiating elements 2 and a plurality of low-frequency radiating elements 1 mounted on the reflecting plate 5, wherein the low-frequency radiating elements 1 are arranged in an array, and the high-frequency radiating elements 2 are mounted above a central axis of the low-frequency radiating element 1 at intervals and at a middle position adjacent to the low-frequency radiating element 1. The low-frequency radiation units 1 in the array adopt linear arrays with equal spacing, the spacing between two adjacent low-frequency radiation units 1 is 250-270 mm, and the too small spacing can cause strong coupling between array elements and is not beneficial to isolation; too large a pitch causes sidelobe levels to rise.
In the high-low frequency nested array, for convenience of distinction, the high-frequency radiating unit 2 installed on the center pallet of the low-frequency radiating unit 1 is marked as a nested high-frequency oscillator 2-1, and the high-frequency radiating unit 2 installed in the middle of the adjacent low-frequency radiating unit 1 is marked as an external high-frequency oscillator 2-2. The external high-frequency oscillator 2-2 is greatly influenced by stray waves of the low-frequency radiating unit 1, and radiation beams can be focused by using the high-frequency boundary plate 3 and additionally arranging the director 4 above the external high-frequency oscillator 2-2, so that the influence of the stray waves on a radiation pattern is overcome to a certain extent.
Fig. 4 shows the result of the standing wave measurement of the miniaturized ultra-wideband low-frequency radiating element. From this figure it can be seen that: although the size is small and impedance transformation and a complex matching circuit are not adopted, the low-frequency radiating unit still has the working bandwidth of 698-960 MHz, and the standing wave is lower than 1.65 in the working bandwidth range.
Fig. 5 shows the directional diagram measurement result of the miniaturized ultra-wideband low-frequency radiating unit. From this figure it can be seen that: the low-frequency radiating unit has a convergent half-power angle in a working bandwidth, the gain is smoothly increased from 7.9dBi to 8.9dBi along with the increase of the frequency, the front-to-back ratio is superior to 22dB, and the index requirement of the ultra-wide-band coaxial nested spatial multiplexing array is completely met.
It will be understood by those skilled in the art from the foregoing description of the structure and principles that the present invention is not limited to the specific embodiments described above, and that modifications and substitutions based on the known art are intended to fall within the scope of the invention, which is defined by the claims and their equivalents. The details not described in the detailed description are prior art or common general knowledge.
Claims (10)
1. The utility model provides a miniaturized ultra wide band low frequency radiating element, is applied to high low frequency nested array which characterized in that: and loading a coupling metal sheet between two adjacent monopole radiating arms with the low-frequency radiating units disconnected, and windowing the metal sheet balun in an up-down laminated mode.
2. A miniaturized ultra-wideband low-frequency radiating element according to claim 1, characterized in that: the low-frequency radiating unit comprises a frame structure and a supporting platform which is arranged above the central axis of the frame structure and provided with an upward flange, wherein the distance between the supporting platform and the bottom of the frame structure is 1/4 high-frequency oscillator central frequency wavelength.
3. A miniaturized ultra-wideband low-frequency radiating element according to claim 2, characterized in that: the frame structure and the supporting platform are both made of aluminum.
4. A miniaturized ultra-wideband low-frequency radiating element according to claim 2, characterized in that: the distance between the supporting platform and the bottom of the frame structure is 30-35 mm.
5. A miniaturized ultra-wideband low-frequency radiating element according to claim 2, characterized in that: the frame structure is a hollow quadrangular frustum pyramid frame piece formed by bending an aluminum plate; the four monopole radiating arms are respectively composed of an open window edge and radiating arms positioned on two sides of the edge, and the coupling metal sheet is arranged between the radiating arms of two adjacent monopole radiating arms; the metal plate balun is composed of hollowed-out side plates.
6. A miniaturized ultra-wideband low-frequency radiating element according to claim 5, characterized in that: the monopole radiating arms which are diagonal to each other have the same polarization direction, and a pair of monopole radiating arms in the same polarization direction are welded with 75 omega radio frequency cables with equal length at a feed point and are welded together through a feed slot to form a 50 omega feed line.
7. A high and low frequency nested array comprising: the reflecting plate is provided with a plurality of high-frequency radiating units and a plurality of low-frequency radiating units, the high-frequency radiating units are arranged on the reflecting plate in an array mode, and the high-frequency radiating units are arranged above the central axis of the low-frequency radiating unit at intervals and in the middle position of the adjacent low-frequency radiating unit; characterized in that the low frequency radiating element is as claimed in any one of claims 1-6.
8. A nested high and low frequency array according to claim 7, wherein the spacing between two adjacent low frequency radiating elements is 250-270 mm.
9. A nested high and low frequency array as claimed in claim 7 wherein a high frequency boundary plate is provided on the reflector plate, the high frequency boundary plate corresponding to the high frequency radiating element mounted at a position intermediate adjacent low frequency radiating elements.
10. A nested array of high and low frequency radiation elements according to claim 7 wherein a director is provided above the high frequency radiation elements mounted intermediate adjacent low frequency radiation elements.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922198698.3U CN210926303U (en) | 2019-12-10 | 2019-12-10 | Miniaturized ultra-wideband low-frequency radiation unit and high-low frequency nested array |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922198698.3U CN210926303U (en) | 2019-12-10 | 2019-12-10 | Miniaturized ultra-wideband low-frequency radiation unit and high-low frequency nested array |
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| CN210926303U true CN210926303U (en) | 2020-07-03 |
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Effective date of registration: 20220706 Address after: 528100 No. 4 Jinye Second Road, Southwest Industrial Park, Sanshui District, Foshan City, Guangdong Province Patentee after: GUANGDONG SHENGLU TELECOMMUNICATION TECH. Co.,Ltd. Patentee after: Guangdong Shenglu Communication Co., Ltd Address before: 528100 No. 4 Jinye Second Road, Southwest Industrial Park, Sanshui District, Foshan City, Guangdong Province Patentee before: GUANGDONG SHENGLU TELECOMMUNICATION TECH. Co.,Ltd. |
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