CN115360490A - Integrated air strip line power division sum-difference network and implementation method - Google Patents
Integrated air strip line power division sum-difference network and implementation method Download PDFInfo
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- CN115360490A CN115360490A CN202210888223.0A CN202210888223A CN115360490A CN 115360490 A CN115360490 A CN 115360490A CN 202210888223 A CN202210888223 A CN 202210888223A CN 115360490 A CN115360490 A CN 115360490A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
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- H—ELECTRICITY
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- H01Q—ANTENNAS, i.e. RADIO AERIALS
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Abstract
The invention provides an integrated air strip line power division sum-difference network and an implementation method thereof, and the network consists of 2 symmetrical unequal power division networks and 1 sum-difference device. The power divider in the power dividing network is arranged in a horizontal and vertical matching manner; the first-stage conversion of the final-stage power divider adopts a square folding circuit; the power distribution relation of the power distribution network adopts a deformed Taylor amplitude weighting design; the integrated air stripline adopts a cylindrical medium nesting support mode. The invention has high integration level, small transmission loss, small network volume, light weight and simple power distribution matching adjustment, and can be applied to high-power low-side lobe and difference beam antenna systems with few units.
Description
Technical Field
The invention belongs to the technical field of radar antenna feeders.
Background
According to the requirements of radar specific amplitude direction finding and other functions, an antenna directional diagram needs to form weighted sum and difference beams, and a sum and difference device and a power divider are the key for realizing the weighted sum and difference beams of a radar feeder network. The traditional sum-difference device and the traditional power divider mostly appear as independent modules and are connected with each other by cables, so that the structure is complex and the integration level is low; the power dividing units in the power divider are arranged in the same direction in a cascading manner, so that the power divider is large in size and weight; when the number of units is small and low side lobes are required, taylor and Chebyshev distribution is adopted for amplitude weighting, the power distribution ratio is large, and the power distribution unit is difficult to realize; the dielectric support structure of the conventional stripline affects the transmission line characteristics, so that the amplitude-phase distribution accuracy and the impedance matching degree are lowered.
Disclosure of Invention
In order to solve the problem of realizing sum-difference weighted beams by the traditional sum-difference device and the traditional power divider, the invention provides an integrated air stripline power dividing sum-difference network and an implementation method thereof.
The invention provides an integrated air strip line power division sum-difference network, which adopts the technical scheme that:
the system comprises 2 unequal power division networks and 1 sum-difference device; the power distribution network and the sum and difference device are directly connected by a strip line and share a metal cavity; the front-stage power divider unit in the power dividing network is horizontally arranged, and the final-stage power divider unit is vertically arranged; the first-stage conversion section of the final-stage power divider adopts a square-shaped wire; the air strip lines adopted by the power divider and the sum-difference device are nested and supported by a cylindrical medium.
Further, the cylindrical medium is used for supporting the air stripline, and the size and the position of each part of the cylindrical medium can be used for adjusting the amplitude, the phase and the impedance matching of the power divider.
The invention also provides a method for realizing the integrated air strip line power division sum-difference network, which adopts the amplitude weighting design of the deformed Taylor distribution to obtain the unit spacing, the number and the amplitude distribution of each unit according to the antenna gain, the wave width and the side lobe requirement, so as to design the structure of the power divider and the power division ratio of each power divider. The technical scheme comprises the following steps:
the distribution relation of the power distribution network adopts deformed Taylor distribution and is determined by using correction factors and amplitude segments; determining the power division ratio of each power divider according to the power distribution relation, wherein the power dividers adopt a Wilkinson form, the preceding power dividers are horizontally arranged, the final power dividers are vertically arranged, the first-stage transformation adopts a square-shaped transformation section, and the total length, the length and the tangential angle shape of the square-shaped transformation section are determined according to a specific numerical value relation; and determining the position of the cylindrical supporting medium according to the distribution requirement of the amplitude phase and the standing wave requirement, wherein the size and the position of each part of the cylindrical medium are used for adjusting the amplitude, the phase and the impedance matching of the power divider.
Compared with the prior art, the invention has the following beneficial effects:
(1) The sum-difference device and the power divider are matched and directly connected to share one metal cavity, the pre-stage power divider and the final-stage power divider are configured in different modes, and the final-stage power divider adopts a mouth-shaped conversion section, so that the volume, the weight and the electric connection loss are reduced.
(2) The invention adopts the cylindrical nested medium to support the metal inner conductor, thereby reducing the weight and properly adjusting the amplitude, the phase and the impedance matching.
(3) The amplitude distribution of the invention adopts the deformed Taylor amplitude distribution, the edge output decline becomes slow, the power dividing ratio is reduced, the realization of the power divider unit engineering is easy, and the amplitude precision is better.
Drawings
Fig. 1 is a schematic diagram of a power division sum and difference network.
Fig. 2 is a schematic diagram of an air strip line power dividing sum-difference network structure. The device comprises a 1-output port, a 2-sum beam input port, a 3-difference beam input port, a 4-1-6-unequal power division network, a 5-sum-difference device and a 6-metal cavity.
Fig. 3 is a structural schematic diagram of a modified Wilkinson power divider. Wherein, the 7-power divider first-stage conversion and the 8-cylindrical supporting medium.
Fig. 4 is a schematic diagram of a cylindrical media nesting support. Wherein, 9-upper cylinder, 10-lower cylinder, and 11-opening hole on the strip line.
Detailed Description
The invention is further explained below with reference to the figures and examples.
The invention relates to an integrated air strip line power division sum-difference network and an implementation method thereof, and the specific embodiment is as follows (see the attached drawing):
1. referring to fig. 1 and 2, the power dividing sum and difference network is composed of 2 symmetrical 1-6 unequal power dividing networks 4 and 1 sum and difference device 5, and the whole network is installed in a metal cavity 6. The power division sum and difference network has 12 output ports 1,1 sum beam input ports 2 and 1 difference beam input port 3. The sum-difference device and the power divider are completely integrated, the output port of the sum-difference device is the input port of the power divider, and the sum-difference signal is directly sent into the power dividing network through an air strip line. The front 2-level power divider of the power dividing network is placed straightly, the distance between the two branches is reduced as much as possible, and the vertical space occupation is reduced.
2. Root of herbaceous plantAccording to the index requirement of the radar antenna, the power distribution relation of the power division sum-difference network is determined, the amplitude distribution of the deformed Taylor is improved from the traditional Taylor, and the amplitude distribution I of the deformed Taylor n Is determined by the following equation:
wherein:
where xi is the major-to-minor ratio, P 1 To improve the factor, according to the actual situation P 1 The value range is 0.900-0.975, and A' is obtained, so that the power distribution ratio of each stage of power distribution unit circuit is below 2.
The normalized power distribution ratio of each unit is obtained by calculation and is shown in table 1:
TABLE 1 Power distribution ratio of modified Taylor distribution units
| |
1 | 2 | 3 | 4 | 5 | 6 |
| Normalized power ratio | 0.2246 | 0.2848 | 0.4350 | 0.6378 | 0.8686 | 1.0000 |
3. Referring to fig. 2 and 3, the characteristic impedance of the air strip is 50 Ω, the thickness of the inner conductor is 1mm, the line width of 50 Ω is 8.9mm, and the internal height of the metal cavity is 8mm. And 2, the power division unit circuit selects a Wilkinson isolation type power divider as a feed network unit circuit. The first-stage transformation section 7 of the last two-stage power divider is arranged in a shape like a Chinese character 'kou', the ratio of the transverse length to the vertical length is k, the value range of k is 1.1-1.25, and fine adjustment is carried out according to standing waves and power distribution. The 90-degree turning part of the strip line adopts a corner cut form, the corner cut angle is 45 degrees, and the length of the corner cut is long
The width w of the strip line is multiplied, and the single side of the square-shaped routing is folded to be 9/32 times of the working wavelength.
4. Referring to fig. 3 and 4, the air stripline in the metal cavity is fixed in a nesting manner of cylindrical mediums. Go up the cylinder 9 inside and undercut, the little cylinder is stretched out on lower cylinder 10 upper portion, and trompil 11 is gone up to the stripline, and lower cylinder passes the inner conductor through-hole, inserts the inside band clamp fastening of going up the cylinder and fixes.The column material adopts polytetrafluoroethylene, and the relative dielectric constant epsilon of the polytetrafluoroethylene r And =2.2, the outer radius r2=2mm of the cylinder and the inner radius r1=1mm of the strip line opening hole, the amplitude and the phase of the related unit branch can be properly changed, and a certain regulating effect on the standing wave is achieved. If the cylindrical medium supports 8 are respectively arranged at the positions of the unequal branch arms of the power divider, which are symmetrically transformed in the second stage, the sizes of all parts of the cylinder are respectively adjusted, so that the standing wave, unit phase and amplitude distribution meet the design requirements.
Claims (3)
1. An integrated air strip line power dividing sum-difference network is characterized in that: the system comprises 2 unequal power division networks and 1 sum-difference device; the power distribution network and the sum and difference device are directly connected by a strip line and share a metal cavity; the front-stage power divider unit in the power dividing network is horizontally arranged, and the final-stage power divider unit is vertically arranged; the first-stage conversion section of the final-stage power divider adopts a square-shaped wire; the air strip lines adopted by the power divider and the sum-difference device are nested and supported by cylindrical media.
2. An integrated air stripline power splitting sum and difference network as recited in claim 1, wherein: the size and the position of each part of the cylindrical medium can adjust the amplitude, the phase and the impedance matching of the power divider.
3. The method for implementing an integrated air stripline power division sum and difference network as claimed in claim 1, wherein: the distribution relation of the power distribution network adopts deformed Taylor distribution and is determined by using correction factors and amplitude segments; the total length, the length of each segment and the shape of a chamfer of a first-stage conversion section of the final-stage power divider are determined according to a specific numerical relationship; the size and the position of each part of the cylindrical medium can adjust the amplitude, the phase and the impedance matching of the power divider.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201337574Y (en) * | 2009-01-13 | 2009-11-04 | 孙雅婷 | Earpick with safety helmet |
| CN201812918U (en) * | 2010-09-30 | 2011-04-27 | 浙江纺织服装职业技术学院 | Air stripline one-to-two power divider |
| CN202487735U (en) * | 2011-12-01 | 2012-10-10 | 深圳市云海通讯股份有限公司 | Low-intermodulation broadband power divider |
| CN203910944U (en) * | 2014-05-27 | 2014-10-29 | 深圳国人通信股份有限公司 | Antenna and phase shifter thereof |
| CN107565227A (en) * | 2017-07-27 | 2018-01-09 | 中国船舶重工集团公司第七二四研究所 | A kind of low sidelobe antenna air strip line and poor power division network |
| CN108110422A (en) * | 2017-12-08 | 2018-06-01 | 中国船舶重工集团公司第七二四研究所 | A kind of PMI foam medium plate strip lines of low-loss lightweight structure |
| CN108346845A (en) * | 2018-02-08 | 2018-07-31 | 中国电子科技集团公司第三十八研究所 | A kind of ultra-wideband high power miniaturization power splitter |
| CN111628260A (en) * | 2020-06-28 | 2020-09-04 | 中国电子科技集团公司第二十研究所 | Power distribution network with high power capacity |
-
2022
- 2022-07-27 CN CN202210888223.0A patent/CN115360490A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201337574Y (en) * | 2009-01-13 | 2009-11-04 | 孙雅婷 | Earpick with safety helmet |
| CN201812918U (en) * | 2010-09-30 | 2011-04-27 | 浙江纺织服装职业技术学院 | Air stripline one-to-two power divider |
| CN202487735U (en) * | 2011-12-01 | 2012-10-10 | 深圳市云海通讯股份有限公司 | Low-intermodulation broadband power divider |
| CN203910944U (en) * | 2014-05-27 | 2014-10-29 | 深圳国人通信股份有限公司 | Antenna and phase shifter thereof |
| CN107565227A (en) * | 2017-07-27 | 2018-01-09 | 中国船舶重工集团公司第七二四研究所 | A kind of low sidelobe antenna air strip line and poor power division network |
| CN108110422A (en) * | 2017-12-08 | 2018-06-01 | 中国船舶重工集团公司第七二四研究所 | A kind of PMI foam medium plate strip lines of low-loss lightweight structure |
| CN108346845A (en) * | 2018-02-08 | 2018-07-31 | 中国电子科技集团公司第三十八研究所 | A kind of ultra-wideband high power miniaturization power splitter |
| CN111628260A (en) * | 2020-06-28 | 2020-09-04 | 中国电子科技集团公司第二十研究所 | Power distribution network with high power capacity |
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