CN103682650A - Slotted waveguide antenna with high cross polarization - Google Patents
Slotted waveguide antenna with high cross polarization Download PDFInfo
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- CN103682650A CN103682650A CN201310489070.3A CN201310489070A CN103682650A CN 103682650 A CN103682650 A CN 103682650A CN 201310489070 A CN201310489070 A CN 201310489070A CN 103682650 A CN103682650 A CN 103682650A
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Abstract
The invention relates to a slotted waveguide antenna with high cross polarization. The antenna comprises a ridge waveguide (1), a ridge (2), waveguide radiation slits (5) and perturbed metallic films, wherein the perturbed metallic films are arranged in the ridge waveguide (1), the depths (b) of ridge grooves at the two sides of the ridge are equal, the waveguide radiation slits (5) are positioned at the center line of the wider edge of the ridge waveguide (1), the number of the perturbed metallic films is consistent with that of the waveguide radiation slits (5), and two adjacent perturbed metallic films are respectively arranged at the two sides of two adjacent waveguide radiation slits (5) in an interlaced manner to compensate the 180 degree of phase difference between the two adjacent waveguide radiation slits (5).
Description
Technical field
The present invention relates to a kind of slotted waveguide antenna of high cross polarization, particularly relate to the application of symmetrical ridges waveguide broadside center leaky antenna perturbation metallic membrane, belong to antenna technical field.
Background technology
From the radiation theory of Waveguide slot antenna, by cutting off the streamline of waveguide surface electric current, carry out excitation electrical field, excitation density is relevant with the density of truncated position electric current and the length in gap.The CURRENT DISTRIBUTION of waveguide surface as shown in Figure 1.
The Slit shape of mold in waveguide antenna gap as shown in Figure 2.Conventionally the gap form of Narrow Wall of Waveguide limit joint-cutting antenna is as shown in gap in figure 4, and the gap form of broadside joint-cutting is as shown in gap in figure 1.Open at waveguide broadside centerline offset X place in gap 1, in conventional waveguide, opens in the gap of waveguide broadside centerline due to cutting surfaces electric current not, so can not produce radiation field.
General waveguide is about center line symmetry, for main mould, opens at the longitudinal slot of waveguide core line due to cutting current line not, so do not produce radiation field.The people such as Julius green and Harold Slmitkin propose the asymmetric ridge waveguide broadside slot array antenna that cracks.Because Asymmetric Ridged Waveguide is asymmetric along broadside center line both sides, make center, waveguide internal field that displacement dx occur, open on waveguide broadside center line in gap, and not on the center line in waveguide internal field, therefore this gap can produce radiation field, Figure 3 shows that the Asymmetric Ridged Waveguide of cracking in broadside center.By changing the asymmetric degree of ridge waveguide, just can control the position at center, waveguide internal field, thereby reach, change a center displacement dx, to control the radiation level in gap, realize the weighting of antenna aperture.
In order to compensate between adjacent cells the phase difference of 180 °, in the array antenna cracking at Asymmetric Ridged Waveguide center line, must compensate by the direction of asymmetric section of waveguide., there is the discontinuity of groove depth b1 and b2 in the joint of the ridge waveguide section that adjacent slits is corresponding, in order to reduce the impact of discontinuity, the also convenience in order to process, adopts arc transition at discontinuous place simultaneously.As shown in Figure 4.
Summary of the invention
Technology of the present invention is dealt with problems and is: the design difficulty that overcomes prior art is large, and the product process-cycle is long, and the deficiency that product quality is heavy, provides the design of a kind of symmetrical ridges waveguide broadside center leaky antenna.
Technical solution one of the present invention is: a kind of slotted waveguide antenna of high cross polarization, comprise that ridge waveguide, ridge, waveguide antenna gap also comprise perturbation metallic membrane, and in the inside of ridge waveguide, the ridge groove depth of ridge both sides equates; Waveguide antenna gap is positioned on the center line of ridge waveguide broadside; The quantity of perturbation metallic membrane is consistent with the quantity in waveguide antenna gap, and the both sides in adjacent two waveguide antenna gaps that adjacent two perturbation metallic membranes are staggered, for compensating between adjacent two waveguide antenna gaps 180 ° differ.
Technical solution of the present invention two is: a kind of slotted waveguide antenna of high cross polarization, comprises ridge waveguide, ridge, waveguide antenna gap; Ridge waveguide, ridge, waveguide antenna gap form Asymmetric Ridged Waveguide inner-cavity structure, also comprise perturbation metallic membrane, the quantity of perturbation metallic membrane is consistent with the quantity in waveguide antenna gap, the both sides in adjacent two waveguide antenna gaps that adjacent two perturbation metallic membranes are staggered.
Technical solution of the present invention three is: a kind of slotted waveguide antenna of high cross polarization, comprises rectangular waveguide and waveguide antenna gap; It is characterized in that: also comprise perturbation metallic membrane, the quantity of perturbation metallic membrane is consistent with the quantity in waveguide antenna gap the both sides in adjacent two waveguide antenna gaps that adjacent two perturbation metallic membranes are staggered.
On the broadside center line of described waveguide antenna gap in rectangular waveguide.
The width in described waveguide antenna gap is w, and the selection range of w is 0<w<s, the width that s is ridge.
The quantity in described waveguide antenna gap is more than or equal to 2.
The selection range of the height h of described perturbation metallic membrane is 0<h<d; The selection range of thickness e is 0<e<s/2; The selection range of length L is (λ
g/ 4) <L< (3 λ
g/ 4), λ wherein
gfor the guide wavelength under the corresponding operating frequency of selected waveguide, the width that s is ridge, the height=b-d of ridge.
Described perturbation metallic membrane be shaped as cuboid or cylinder or anomalistic object.
Design principle of the present invention: be to change electric current linear flow in both sides, waveguide broadside inwall gap through path by add the metallic membrane of certain size, its effect in wave-guide cavity wave inside, thereby obtain equivalent gap amount of bias dx; By the insertion depth of metallic membrane, regulate the equivalent amount of bias dx of radiating slot, thereby realize the amplitude weighting of radiating slot.
The present invention compared with prior art beneficial effect is:
1, the present invention is by the improvement to traditional Asymmetric Ridged Waveguide broadside center slot antenna array design method, adopt symmetrical ridges waveguide broadside center to open radiating slot design, Bing gap edge loads the method for perturbation metallic membrane to cavity direction in waveguide, reduced the design difficulty of antenna integral body.
Original method for designing is for different field center-biased amount dx, and corresponding waveguide cross section b1, the b2 in gap is different, and b1, b2 are when controlling dx, also must guarantee that guide wavelength is constant, and design difficulty is larger.The method for designing proposing herein, b1, b2 choose identical value, height h by the one side metal-loaded diaphragm in gap controls dx, because the thickness e of the metallic membrane loading can be controlled at the as far as possible little size that machining allows, its loading along cavity direction in waveguide can not cause obvious impact to direction of propagation guide wavelength.So this method for designing can reduce the design difficulty of antenna integral body.
2, the present invention adopts the design of cracking in symmetrical ridges waveguide (being the Asymmetric Ridged Waveguide of b1=b2) center, change original slot array antenna between adjacent 2 gaps ridge groove depth b1 and b2 to be alternately changed to ridge groove depth constant, effectively simplified the mechanism design difficulty of antenna and the difficulty of machining.
3, the present invention adopts the form of symmetrical ridges waveguide, controls the amount of bias dx in gap by loading the height h of diaphragm, effectively reduces the whole height of antenna; In reality processing, effectively reduced the overall weight of antenna.
4, the method for designing of Disk-loaded waveguide of the present invention, can be used in combination with the method for designing of Asymmetric Ridged Waveguide equally, the another method of controlling as amount of bias dx.
5, the principle of the invention is simple, and design easily, has the practical advantage such as application convenience, function admirable, compact conformation, has avoided the shortcoming that traditional Asymmetric Ridged Waveguide center line slot array antenna design difficulty is large, the process-cycle is long; Applied basic fundamental is ripe, be convenient to the features such as through engineering approaches application, has very strong competitiveness.
6, the present invention is the design of symmetrical ridges groove owing to having changed existing Asymmetric Ridged Waveguide center slot antenna array at the checker that adds asymmetric ridge groove in man-hour, so can simplify the course of processing, shortens the process-cycle; The design of employing symmetrical ridges groove can effectively reduce the total height of antenna, alleviates antenna weight; In the multipolarization borne SAR application with high polarization purity requirement, there is very strong practicality and the market competitiveness.
Accompanying drawing explanation
Fig. 1 is waveguide surface CURRENT DISTRIBUTION schematic diagram;
Fig. 2 is the cutting mode in waveguide antenna gap;
Fig. 3 is the Asymmetric Ridged Waveguide of cracking in broadside center;
Fig. 4 is Asymmetric Ridged Waveguide broadside center slot array;
Fig. 5,6 is respectively Waveguide slot array antenna graphics and the 2 d plane picture that symmetrical ridges waveguide core of the present invention is cracked;
Fig. 7 is antenna of the present invention cross section enlarged drawing;
Fig. 8 is antenna partial enlarged drawing of the present invention;
Fig. 9 is center of antenna frequency antenna pattern simulation result of the present invention.
embodiment
As shown in Fig. 5,6,7, the present invention is the Waveguide slot array antenna that a kind of symmetrical ridges waveguide core is cracked, and by symmetrical single ridged waveguides 1(, comprises wave guide ridge 2, ridge groove 3,4), radiating slot 5 and forming around metallic membrane 6,7.
The ridge groove depth 3,4 of symmetrical matrix single ridged waveguides 1 both sides is equal, and radiating slot 5 is positioned at the center of ridge waveguide broadside, and the perturbation metallic membrane 6,7 of loading is alternately distributed in the both sides of radiating slot 5.In the inside of ridge waveguide 1, the ridge groove depth b of ridge 2 both sides equates; Waveguide antenna gap 5 is positioned on the center line of ridge waveguide 1 broadside; The gap width in waveguide antenna gap 5 is w, and the selection range of w is 0<w<s; The quantity of radiating slot 5 is more than or equal to 2, the quantity of perturbation metallic membrane is consistent with the quantity in waveguide antenna gap 5, the both sides in adjacent two waveguide antenna gaps 5 that adjacent two perturbation metallic membranes interlock (as shown in Figure 8, perturbation metallic membrane 6,7 is interspersed in radiating slot 5 both sides), for compensating between adjacent two waveguide antenna gaps 5 180 ° differ, the height of perturbation metallic membrane 6,7 can be controlled the electric field strength of radiating slot 5.
The height of perturbation metallic membrane is h, and the selection range of h is 0<h<d; The thickness of diaphragm is e, and the selection range of e is 0<e<s/2; The length of diaphragm is L, and the selection range of L is (λ
g/ 4) <L< (3 λ
g/ 4), λ wherein
gfor the guide wavelength under the corresponding operating frequency of selected waveguide; S is the width of ridge 2, the height=b-d of ridge 2.The shape of perturbation metallic membrane is not defined as cuboid, can be cylinder or anomalistic object.
The slot array antenna that the design of perturbation metallic membrane not only can be cracked for symmetrical ridges waveguide core, also can be used as the assistance application means that regulate amount of bias dx when Asymmetric Ridged Waveguide center leaky antenna designs.Specific as follows:
A slotted waveguide antenna for high cross polarization, comprises ridge waveguide 1, ridge 2, waveguide antenna gap 5; Ridge waveguide 1, ridge 2, waveguide antenna gap 5 form Asymmetric Ridged Waveguide inner-cavity structure, it is characterized in that: also comprise perturbation metallic membrane, the quantity of perturbation metallic membrane is consistent with the quantity in waveguide antenna gap 5, the both sides in adjacent two waveguide antenna gaps 5 that adjacent two perturbation metallic membranes are staggered.The relative dimensions design of perturbation metallic membrane is the same.
The same design that is applicable to rectangular waveguide broadside center line leaky antenna of mentality of designing of the present invention.Concrete: a kind of slotted waveguide antenna of high cross polarization, comprise rectangular waveguide and waveguide antenna gap 5 and perturbation metallic membrane, the quantity of perturbation metallic membrane is consistent with the quantity in waveguide antenna gap 5, the both sides in adjacent two waveguide antenna gaps 5 that adjacent two perturbation metallic membranes are staggered.The relative dimensions design of perturbation metallic membrane is the same.
The height h of perturbation metallic membrane can, for controlling the radiation level of radiating slot 5, realize the weighting of antenna aperture.Specific design thinking is as follows:
First according to mission requirements, design a symmetrical single ridged waveguides that meets frequency requirement, the selection of d value can not be too small, loads the installing space of perturbation diaphragm after considering.Secondly, according to conventional method for designing, radiating slot is opened at disalignment place, obtained the amount of bias dx meeting the demands.Again, do not change width w and the length L of radiating slot, radiating slot is opened in broadside centerline, and in the side in gap, to wave-guide cavity wave, inner to load a thickness be e, is highly h, the perturbation metallic membrane that length is L; The selection of e is advisable not change the guide wavelength of original waveguide, and the Initial value choice of e and h meets following relation: dx ≈ e+2h.Finally above parameter is brought into current existing electromagnetic field of high frequency simulation software (such as HFSS etc.) and recalculate, can finely tune height h if needed.
To introduce the concrete size of the designed example antenna of the present invention as follows according to above-mentioned:
The cross section of symmetrical single ridged waveguides 1 is: a=18.5mm, b=8.6mm
Radiating slot is of a size of: w=1.6mm, L=29.5mm
Metal-loaded diaphragm is of a size of: e=0.8mm, h=0.7mm
Antenna of the present invention radiance design result when 5.4GHz is shown in Fig. 9.
Can see, the greatest irradiation direction of antenna is dead ahead, adopts the antenna side lobe of constant amplitude homophase weighting to be about 12.5dB, and the cross polarization corresponding in greatest irradiation direction is better than 65dB, in the cross polarization of the corresponding scope of the 3dB of main pole beamwidth, is better than 50dB.
The present invention is that a kind of function admirable, method for designing simply, are easily processed and the lighter Waveguide slot array antenna of weight.Be applicable to, to the much higher polarization array antenna of polarization purity requirement, to there is very strong practicality and the market competitiveness.
The unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.
Claims (8)
1. a slotted waveguide antenna for high cross polarization, comprises ridge waveguide (1), ridge (2), waveguide antenna gap (5); It is characterized in that: also comprise perturbation metallic membrane, the inside in ridge waveguide (1), the ridge groove depth b of ridge (2) both sides equates; Waveguide antenna gap (5) is positioned on the center line of ridge waveguide (1) broadside; The quantity of perturbation metallic membrane is consistent with the quantity of waveguide antenna gap (5), the both sides in adjacent two waveguide antenna gaps (5) that adjacent two perturbation metallic membranes are staggered, for compensating between adjacent two waveguide antenna gaps (5) 180 ° differ.
2. a slotted waveguide antenna for high cross polarization, comprises ridge waveguide (1), ridge (2), waveguide antenna gap (5); Ridge waveguide (1), ridge (2), waveguide antenna gap (5) form Asymmetric Ridged Waveguide inner-cavity structure, it is characterized in that: also comprise perturbation metallic membrane, the quantity of perturbation metallic membrane is consistent with the quantity of waveguide antenna gap (5), the both sides in adjacent two waveguide antenna gaps (5) that adjacent two perturbation metallic membranes are staggered.
3. a slotted waveguide antenna for high cross polarization, comprises rectangular waveguide and waveguide antenna gap (5); It is characterized in that: also comprise perturbation metallic membrane, the quantity of perturbation metallic membrane is consistent with the quantity of waveguide antenna gap (5) both sides in adjacent two waveguide antenna gaps (5) that adjacent two perturbation metallic membranes are staggered.
4. the slotted waveguide antenna of a kind of high cross polarization according to claim 3, is characterized in that: on the broadside center line of described waveguide antenna gap (5) in rectangular waveguide.
5. according to the slotted waveguide antenna of a kind of high cross polarization described in claim 1 or 2 or 3, it is characterized in that: the width in described waveguide antenna gap (5) is w, the selection range of w is 0<w<s, and s is the width of ridge (2).
6. according to the slotted waveguide antenna of a kind of high cross polarization described in claim 1 or 2 or 3, it is characterized in that: the quantity in described waveguide antenna gap (5) is more than or equal to 2.
7. according to the slotted waveguide antenna of a kind of high cross polarization described in claim 1 or 2 or 3, it is characterized in that: the selection range of the height h of described perturbation metallic membrane is 0<h<d; The selection range of thickness e is 0<e<s/2; The selection range of length L is (λ
g/ 4) <L< (3 λ
g/ 4), λ wherein
gfor the guide wavelength under the corresponding operating frequency of selected waveguide, s is the width of ridge (2), the height=b-d of ridge (2).
8. according to the slotted waveguide antenna of a kind of high cross polarization described in claim 1 or 2 or 3, it is characterized in that: described perturbation metallic membrane be shaped as cuboid or cylinder or anomalistic object.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310489070.3A CN103682650A (en) | 2013-10-17 | 2013-10-17 | Slotted waveguide antenna with high cross polarization |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310489070.3A CN103682650A (en) | 2013-10-17 | 2013-10-17 | Slotted waveguide antenna with high cross polarization |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490019A (en) * | 2015-10-26 | 2016-04-13 | 北京遥测技术研究所 | Circularly polarized ridge waveguide slot antenna |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6201507B1 (en) * | 1998-04-09 | 2001-03-13 | Raytheon Company | Centered longitudinal shunt slot fed by a resonant offset ridge iris |
| CN102496784A (en) * | 2011-11-11 | 2012-06-13 | 中国电子科技集团公司第三十八研究所 | Ridge waveguide broad-side horizontal straight slot antenna |
-
2013
- 2013-10-17 CN CN201310489070.3A patent/CN103682650A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6201507B1 (en) * | 1998-04-09 | 2001-03-13 | Raytheon Company | Centered longitudinal shunt slot fed by a resonant offset ridge iris |
| CN102496784A (en) * | 2011-11-11 | 2012-06-13 | 中国电子科技集团公司第三十八研究所 | Ridge waveguide broad-side horizontal straight slot antenna |
Non-Patent Citations (1)
| Title |
|---|
| V.V.ZEMLYAKOV ET AL: "MICROWAVE SLOT ANTENNA BASED ON ASYMMETRICAL RIDGED WAVEGUIDE", 《INTERNATIONAL CONFERENCE ON ANTENNA THEORY AND TECHNIQUES,2013》, 20 September 2013 (2013-09-20), pages 193 - 195, XP032518803, DOI: doi:10.1109/ICATT.2013.6650722 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490019A (en) * | 2015-10-26 | 2016-04-13 | 北京遥测技术研究所 | Circularly polarized ridge waveguide slot antenna |
| CN105490019B (en) * | 2015-10-26 | 2018-10-09 | 北京遥测技术研究所 | A kind of circular polarisation ridge waveguide slot antenna |
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Application publication date: 20140326 |