CN203733943U - Dual-frequency orthogonal polarization type high-isolation horn antenna - Google Patents
Dual-frequency orthogonal polarization type high-isolation horn antenna Download PDFInfo
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- CN203733943U CN203733943U CN201420081936.7U CN201420081936U CN203733943U CN 203733943 U CN203733943 U CN 203733943U CN 201420081936 U CN201420081936 U CN 201420081936U CN 203733943 U CN203733943 U CN 203733943U
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- feed port
- isolation
- waveguide
- frequency feed
- orthogonal polarization
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Abstract
The utility model discloses a dual-frequency orthogonal polarization type high-isolation horn antenna comprising a conical horn. The horn is provided with a high-frequency feed port and a low-frequency feed port which are vertical to each other. Each of the high-frequency feed port and the low-frequency feed port is provided with a square waveguide for feeding. The square waveguide is in transition connection with the high-frequency feed port and the low-frequency feed port. The low-frequency feed port is arranged horizontally and connected with the square waveguide which is arranged horizontally. The high-frequency feed port is arranged vertically and connected with the square waveguide which is arranged vertically. The horizontal sidewall of the horn is provided with opposite through holes. The opposite through holes are arranged on the central line of the horizontal waveguide. A metal long pin is arranged in the opposite through holes. The waveguide which is arranged vertically is provided with a deployment screw. The dual-frequency orthogonal polarization type high-isolation horn antenna of the utility model has advantages of simple structure, convenient utilization and superior performance, is suitable for millimeter wave weather radar, and has advantages of relatively-simple structure and easy machining implementation.
Description
Technical field
The invention belongs to horn antenna and surface antenna routed source domain, particularly a kind of double frequency orthogonal polarization high-isolation horn antenna.
Background technology
Meteorological closely bound up with the people's life.China's meteorological disaster occurs frequent, and production, life impact on people are larger, and people recognize the importance of weather information resource to socio-economic development day by day.Development and the people's lives of weather information to department of many social economies have very large contribution.Cloud is all being played the part of extremely important role in many fields of the physical processes such as weather system development, precipitation formation and atmospheric radiation transmission and national economy.At present, to have become most important in global climate model be also one of the most doubt meteorological element to cloud.The monitoring of cloud, rain distribution, characteristic and evolution motion process thereof has very important effect for studying Global climate change and carrying out weather forecast.Therefore, to the detection of the cloud particular importance that seems.
The research work of cloud is complicated and huge, and the research that detects microcosmic cloud particle physics, chemistry, optics, radiation characteristic etc. from macroscopical cloud amount, cloud form, the cloud level, the speed of movement of cloud is the emphasis of cloud research always.Observation and research for cloud and radiation characteristic thereof relatively lack always.At present main conventional meteorological radar is divided into clear sky wind profile radar and weather rain detection radar of new generation.What China was the most frequently used is weather rain detection radar of new generation.This radar is mainly used in the diastrous weathers such as monitoring and early warning Strong Thunderstorm, if detection cloud needs higher through-put power and the larger antenna of configuration, even if like this, be centimeter wave due to what use, exist the use problems such as for example atural object blocks, specifically detection condition.The operation wavelength of wind profile radar reaches 6m, the ability of its detection clear sky wind field and all fine for the observing capacity of Precipitation cloud structure, and the ability of still surveying cloud is quite limited.Therefore, although these two kinds of radars can provide the information about cloud in some cases, temporal resolution and spatial resolution are all very low, are not enough to provide detailed cloud structure, can not accurately reflect the cloud parameter information that the moment changes.So they are not suitable for the grand microscopic characteristics that is used for specially observation and studies cloud.And the operation wavelength of millimetre-wave radar is in millimere-wave band, it is to utilize cloud particle to electromagnetic scattering properties, understands the various characteristics of cloud by the analysis on radar echoes to cloud, and cloud echo parameter has reflected the macro-and micro-structure of cloud.
At millimeter wave frequency band, when electron energy is propagated in atmosphere with atmosphere in the interaction of suspended particulates and hydrous matter than strong many of the interaction of microwave frequency band, these interactional mechanism are mainly absorption, scattering and refraction.And the back scattering that the suspended particles based in atmosphere produce electromagnetic wave just of millimeter wave cloud detection radar principle.The main gas that affects millimeter wave propagation is oxygen molecule and steam.The resonance of these gases will produce selectivity at millimeter wave frequency band and absorb and scattering.The absworption peak that oxygen molecule resonance causes appears near 60GHz and 120GHz; The absworption peak that steam causes appears near 220GHz and 183GHz, there are 4 atmosphere " window " that propagation attenuation is less at whole millimeter wave frequency band, its centre frequency is respectively near 35GHz, 94GHz, 140GHz and 220GHz, and available bandwidth is respectively in 15GHz, 20GHz, 25GHz, 60GHz left and right.Can find out, the available bandwidth of any one millimeter wave window has nearly all comprised the whole frequency range of centimeter wave frequency range.These wide band utilizations are extremely conducive to the Application and Development of radar target acquisition and identification.The characteristic of millimeter wave has determined that millimetre-wave radar has the features such as wavelength is short, bandwidth, volume is little, lightweight, mobility is good.Under same antenna aperture, millimetre-wave radar has the following advantages: be easy to realize narrow beam, Sidelobe, high-gain, in target identification, can provide good precision and resolving power; The precision that the angle of site is surveyed be can put forward, multipath effect and noise jamming effectively suppressed; Narrow beam also can improve radar system antijamming capability.
Double frequency cross-polarized antennas, as the equipment of a kind of reception and emitting electromagnetic wave, is a critical component in whole millimetre-wave radar system.This antenna set the advantage of dual-band antenna and cross-polarized antennas, can not only greatly improve the performance of antenna, and reduce the number of the required antenna of communication system, can reduce to a great extent the cost of system.But double frequency cross-polarized antennas has larger difficulty and challenge in research and design: require antenna to have dual frequency characteristics on the one hand, and each frequency band requires again certain bandwidth.On the other hand each frequency range of antenna has also been proposed the requirement of polarization, or be that different frequency ranges works in different polarization characteristics, or each frequency range to have the characteristic of orthogonal polarization, and require to have higher isolation.All adopt at present microstrip coupled feed, multiple-layered patches structure and orthomode coupler to realize double frequency orthogonal polarization.
But, for microstrip antenna, itself exist interport isolation poor, gain lower, be not suitable for the feed of large-scale reflector antenna; And often internal structure complexity of orthomode coupler, especially for millimeter wave band, device size is little, device is difficult to processing, cost is higher, and complicated internal structure easily cause the later stage use with test process in there is more destabilizing factor, affect the overall performance of device.Therefore be necessary to design a kind of double frequency orthogonal polarization high-isolation horn antenna for millimeter wave band, high-gain, easy processing.
Summary of the invention
For addressing the above problem, the invention discloses a kind of double frequency orthogonal polarization high-isolation horn antenna.
For addressing the above problem, the method that the present invention adopts is: a kind of double frequency orthogonal polarization high-isolation horn antenna, comprise conical horn, on loudspeaker, be provided with two orthogonal high frequency feed port and low frequency feed port, be respectively arranged with square wave guide in described high frequency feed port and low frequency feed port and carry out feed, described square wave guide carries out transition with described high frequency feed port and low frequency feed port and is connected, its medium and low frequency feed port is horizontally disposed with and is connected with horizontally disposed square wave guide, high frequency feed port vertically arranges and is connected with the square wave guide of vertical setting, in the horizontal side wall of described loudspeaker, be provided with pinking, the position of aperture is arranged on the center line of horizontal waveguide, be provided with metal in to pinking and have strong market potential described, in the waveguide of described vertical setting, be provided with allotment screw.
As a modification of the present invention, described double frequency orthogonal polarization high-isolation horn antenna also comprises an external shell, is provided with a flange being connected with horizontal waveguide and a flange being connected with vertical waveguide on external shell.
As a modification of the present invention, described allotment screw one end is connected with the waveguide vertically arranging, and the other end stretches out described external shell, and can regulate by the part of stretching out external shell.
Beneficial effect:
Double frequency orthogonal polarization high-isolation horn antenna of the present invention, simple in structure easy to use, superior performance, interport isolation high frequency is higher than 40dB, and low frequency is higher than 100dB, gain low frequency is greater than 10dB, high frequency is greater than 20dB, and voltage standing wave ratio is better than 1.2, is applicable to MMW Weather Radar, and structure is relatively simple, processing is easier to realize.
Brief description of the drawings
Fig. 1 is double frequency orthogonal polarization high-isolation horn antenna structural representation;
Fig. 2 is double frequency orthogonal polarization high-isolation horn antenna external mounting figure;
Fig. 3 is the allotment bolt structure schematic diagram that can regulate by outside;
Fig. 4 is the A fragmentary cross-sectional view of horn antenna installation diagram along the center line subdivision parallel with horizontal waveguide broadside;
Fig. 5 is the B fragmentary cross-sectional view of this horn antenna installation diagram along the center line subdivision parallel with horizontal waveguide broadside;
Fig. 6 is that the emulation S parameter curve of this double frequency orthogonal polarization high-isolation horn antenna is in the Parameter Map of Ka wave band;
Fig. 7 is that the emulation S parameter curve of this double frequency orthogonal polarization high-isolation horn antenna is in the Parameter Map of W wave band;
Fig. 8 is that the voltage standing wave ratio of this double frequency orthogonal polarization high-isolation horn antenna is at Ka wave band curve chart;
Fig. 9 is that the voltage standing wave ratio of this double frequency orthogonal polarization high-isolation horn antenna is at W wave band curve chart;
Figure 10 is the gain pattern of this double frequency orthogonal polarization high-isolation horn antenna 35GHz;
Figure 11 is the gain pattern of this double frequency orthogonal polarization high-isolation horn antenna 94GHz;
Figure 12 is that conical horn connects orthogonal Rectangular Waveguide Structure parameter schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand following embodiment and only be not used in and limit the scope of the invention for the present invention is described.It should be noted that, word 'fornt', 'back', " left side ", " right side ", "up" and "down" that use is described below refer to the direction in accompanying drawing, and word " interior " and " outward " refer to respectively the direction towards or away from specific features geometric center.
A kind of double frequency orthogonal polarization high-isolation horn antenna as described in Figure 1, comprise conical horn 5, on loudspeaker, be provided with two orthogonal high frequency feed port and low frequency feed port, be respectively arranged with square wave guide in described high frequency feed port and low frequency feed port and carry out feed, described square wave guide carries out transition with described high frequency feed port and low frequency feed port and is connected, its medium and low frequency feed port is horizontally disposed with and is connected with horizontal square wave guide 2, and high frequency feed port vertically arranges and is connected with vertical square wave guide 1.
In the horizontal side wall of described loudspeaker, be provided with pinking, the position of aperture is arranged on the center line of horizontal waveguide 1, is provided with metal in to pinking and has strong market potential 3 described, is provided with allotment screw 4 on described vertical square wave guide 1.
Described double frequency orthogonal polarization high-isolation horn antenna also comprises an external shell as shown in Figure 2, is provided with a flange 6 being connected with horizontal waveguide 2 and a flange 7 being connected with vertical waveguide 1 on external shell.
Further, described allotment screw 4 one end are connected with vertical waveguide 1, and the other end stretches out described external shell, and can regulate by the part of stretching out external shell, and the structural representation of allotment screw 4 is as shown in 3.
Below in conjunction with concrete numerical value, the present invention is further described, embodiments of the invention are with two the most frequently used window frequency ranges of MMW Weather Radar data, 35GHz(8.6mm) and 94GHz(3.2mm) describe.
In the present embodiment, horizontal square wave guide 2 adopts WR-28 waveguide, and its width edge length is 7.112mm, and narrow edge lengths is 3.556mm; Vertically waveguide 1 adopts WR-10 waveguide, and width edge length is 2.54mm, and narrow edge lengths is 1.27mm.
Figure 12 is that this feed conical horn connects orthogonal Rectangular Waveguide Structure parameter schematic diagram.Its major parameter has actinal surface diameter D, loudspeaker to bore high L.The bore D of conical horn is according to formula
(1)
for-10dB lobe width.Obtain enough gains in order to ensure low frequency 35GHz, when calculating, ought to get
=8mm; But for high frequency 94GHz, loudspeaker bore is larger, must cause directional diagram lobe width narrower, thereby load after parabola, edge illumination level is lower, aperture field skewness, causes reflecting surface bore utilization factor lower, affects the gain effect of parabolic antenna on high frequency.Therefore, in actual design, no matter use which kind of paraboloid structure, in the time of design feed, must weigh the performance of High-frequency and low-frequency, select suitable loudspeaker bore D, can suppress preferably the generation of higher mode simultaneously.
After definite bore D, according to formula:
(2)
Determine that loudspeaker bore high L.In formula
be on actinal surface, it is poor that footpath is penetrated with respect to the maximum at center in edge, and its value should be 0.1
～0.4
in scope.In the feed of design, consider that the performance of high band is very important herein, get
=0.16
,
=3.2mm.
The standing-wave ratio coefficient of WR-10 waveguide position influence PORT1, causes optimum efficiency position through software optimization: approximately one of WR-10 broadside center position WR-28 waveguide end (being also the high order end of length L)
.
In order to improve interport isolation, especially avoid the electromagnetic wave of WR-10 excitation to enter WR-28 waveguide, according to rectangular waveguide theory and field boundary condition, add at coupling aperture place wearing metallic pin 3, and carry out optimization and the comparison of size and position.In WR-10 waveguide, add allotment screw can improve the port match of high frequency.
The use of metallic pin 3, affects feed interport isolation and high frequency port matching performance.According to waveguide transmission line and field boundary condition theory, when passing through coupling aperture place, the vertically polarized wave of PORT1 excitation owing to being cut off, cannot enter PORT2; The horizontal polarized wave of PORT2 excitation, near arrival coupling aperture time, owing to having added the metallic pin parallel with WR-28 broadside 3, known according to perfact conductor boundary condition, its surface field tangential direction is zero, avoids horizontal polarized wave to enter PORT1, obviously improves the isolation between port.Metallic pin 3 is because of vertical with the electric field line of PORT1, therefore do not affect its transmission.Metallic pin 3 is very important parameter with respect to the position of sidewall branch-waveguide WR-10, and it depends on the short circuit plane of reference of each main mould in the frequency band of hope, and metallic pin centre distance WR-10 broadside center approximately
.The diameter dimension of metallic pin should be less than
, avoid having encouraged higher mode, affect port match.In order better to realize the impedance matching of high frequency port, need add an allotment screw in WR-10 rectangular waveguide broadside centre, screw center position coupling aperture place is approximately
.
Fig. 6 is the resolution chart of the emulation of this double frequency orthogonal polarization high-isolation horn antenna to Figure 11, and wherein Fig. 6 is that the emulation S parameter curve of this double frequency orthogonal polarization high-isolation horn antenna is in the Parameter Map of Ka wave band and W wave band to Fig. 7; Fig. 8 is that the voltage standing wave ratio of this double frequency orthogonal polarization high-isolation horn antenna is at Ka wave band and W wave band curve chart; Figure 10 is the gain pattern of this double frequency orthogonal polarization high-isolation horn antenna 35GHz and 94GHz to Figure 11; Simulation result demonstration, this feed is at interport isolation high frequency higher than 40dB, and low frequency is higher than 100dB, and gain low frequency is greater than 10dB, and high frequency is greater than 20dB, and voltage standing wave ratio is better than 1.2.
Above-mentioned double frequency orthogonal polarization high-isolation horn antenna is made simple, with low cost, can be made up of the metal material such as copper, aluminium.
Its concrete manufacturing process can be divided into four steps, gets two thickness and is approximately the metal copper plate that 20mm is thick.The first step can utilize electric spark, boring etc. processes to become the pattern of Fig. 4 in the sheet of metallic material of a monoblock, and in surface gold-plating.Second step is got the sheet of metallic material of same material, and the utilization processes identical with the first step becomes the pattern of Fig. 5, equally in surface gold-plating.The 3rd step, integrates two processomes and is fixed with screw.Finally give two waveguide feed port processing ring flanges.
The disclosed technological means of the present invention program is not limited only to the disclosed technological means of above-mentioned technological means, also comprises the technical scheme being made up of above technical characterictic combination in any.The above is the specific embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (3)
1. a double frequency orthogonal polarization high-isolation horn antenna, it is characterized in that: comprise conical horn, on loudspeaker, be provided with two orthogonal high frequency feed port and low frequency feed port, be respectively arranged with square wave guide in described high frequency feed port and low frequency feed port and carry out feed, described square wave guide carries out transition with described high frequency feed port and low frequency feed port and is connected, its medium and low frequency feed port is horizontally disposed with and is connected with horizontal square wave guide, high frequency feed port vertically arranges and is connected with vertical square wave guide, in the horizontal side wall of described loudspeaker, be provided with pinking, the position of aperture is arranged on the center line of horizontal waveguide, be provided with metal in to pinking and have strong market potential described, in the waveguide of described vertical setting, be provided with allotment screw.
2. double frequency orthogonal polarization high-isolation horn antenna according to claim 1, it is characterized in that: described double frequency orthogonal polarization high-isolation horn antenna also comprises an external shell, on external shell, be provided with a flange being connected with horizontal waveguide and a flange being connected with vertical waveguide.
3. double frequency orthogonal polarization high-isolation horn antenna according to claim 2, it is characterized in that: described allotment screw one end is connected with the waveguide vertically arranging, the other end stretches out described external shell, and can regulate by the part of stretching out external shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420081936.7U CN203733943U (en) | 2014-02-26 | 2014-02-26 | Dual-frequency orthogonal polarization type high-isolation horn antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420081936.7U CN203733943U (en) | 2014-02-26 | 2014-02-26 | Dual-frequency orthogonal polarization type high-isolation horn antenna |
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|---|---|
| CN203733943U true CN203733943U (en) | 2014-07-23 |
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| CN201420081936.7U Expired - Fee Related CN203733943U (en) | 2014-02-26 | 2014-02-26 | Dual-frequency orthogonal polarization type high-isolation horn antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103779663A (en) * | 2014-02-26 | 2014-05-07 | 南京信息工程大学 | Dual-frequency orthogonal polarization high-isolation horn antenna |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103779663A (en) * | 2014-02-26 | 2014-05-07 | 南京信息工程大学 | Dual-frequency orthogonal polarization high-isolation horn antenna |
| CN103779663B (en) * | 2014-02-26 | 2016-08-17 | 南京信息工程大学 | Double frequency cross polarization high-isolation electromagnetic horn |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140723 Termination date: 20160226 |
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| CF01 | Termination of patent right due to non-payment of annual fee |