CN103151618A - Double-frequency-band frequency selective surface reflector plate applied to reflector antenna - Google Patents
Double-frequency-band frequency selective surface reflector plate applied to reflector antenna Download PDFInfo
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- CN103151618A CN103151618A CN2013100559497A CN201310055949A CN103151618A CN 103151618 A CN103151618 A CN 103151618A CN 2013100559497 A CN2013100559497 A CN 2013100559497A CN 201310055949 A CN201310055949 A CN 201310055949A CN 103151618 A CN103151618 A CN 103151618A
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Abstract
The invention discloses a double-frequency-band frequency selective surface reflector plate applied to a reflector antenna, which is mainly used for solving the problem that the angle stability can not be achieved due to the narrower bandwidth of the traditional reflector antenna. The reflector plate is formed by periodically continuing a reflector plate unit in directions of an X-coordinate and a Y-coordinate on which the reflector plate unit is located, wherein the reflector plate unit consists of a medium unit, an upper frequency selection surface unit and a lower frequency selection surface unit; the upper frequency selection surface unit consists of ring patches which are arranged according to a matrix, the lower frequency selection surface unit consists of a square-shaped patch and a vehicle-wheel-shaped patch, a hole is formed in the center of the square-shaped patch, and the vehicle-wheel-shaped patch is in central superposition with the square-shaped patch. According to the double-frequency-band frequency selective surface reflector plate disclosed by the invention, the bandwidth of a resonance frequency band is extended, the multi-angle stability is achieved, and the strength of signals in a communication frequency band is increased.
Description
Technical field
The invention belongs to electronic technology field, further relate to a kind of double frequency-band frequency-selective surfaces reflecting plate for reflector antenna in the electromagnetic material technical field.The present invention can be used for multiplexing reflector antenna of satellite communication, mobile communication, many feeds multifrequency etc.
Background technology
Frequency-selective surfaces not only can effectively be controlled reflection and the transmission of incident electromagnetic wave, select and polarize and select but also can carry out frequency to electromagnetic wave, present the all-pass characteristic for the electromagnetic wave in its passband, and the electromagnetic wave in its stopband is presented total reflection characteristic, have the space filtering function.In microwave regime, the important function of frequency-selective surfaces in the multiband multiplex system makes its multiplexer that can be used for the frequency range of communications satellite, and the multiplexing reflector antenna of many feeds multifrequency.
Patent application " a kind of cross spiral FSS structure and construction method thereof with dual-band characteristic " (application number: 201010601816.1 that BJ University of Aeronautics ﹠ Astronautics proposes, publication number: disclose a kind of cross spiral FSS structure with dual-band characteristic CN102176543A), this structure is comprised of half small size cross spiral structure of a large-sized cross spiral structure and four size relative decreases, and large and small cross spiral structure forms by the S shape arm of cross-arms and cross end; Large-sized cross spiral structure is positioned at the construction unit center of cross spiral FSS structure sheaf, four undersized cross spiral structures by large scale cross spiral structure dwindle one times rotate again 45 ° after respectively upwards left, upwards to the right, downwards left, obtain after right translation downwards; In the structure sheaf of this cross spiral FSS by using two kinds of isomorphisms but the different cross spiral structure generation of size have a passband of dual frequency characteristics.But this structure also has weak point: the first, and this structure uses the double frequency passband of isomorphism unit generation to have identical characterisitic parameter, and the change of size can correspondingly change the characterisitic parameter of passband; The second, this structure adopts two kinds of unit that shape is similar, and both are mutually nested, can produce coupled characteristic; The 3rd, this structure has narrower pass band width characteristic, and angle stability is not fine.
Patent application " a kind of novel to the stable complementary type frequency selection surface of the incidence angle " (application number: 201010178924.2 that BJ University of Aeronautics ﹠ Astronautics proposes, publication number: disclose a kind of novel to the stable complementary type frequency selection surface of incidence angle CN101847766A), this complementary type frequency selection surface is simple in structure, is easy to processing.When but the weak point of this complementary type frequency selection surface is for the electromagnetic wave oblique incidence, along with the increase of incident angle, resonance frequency can be offset, and the frequency shift (FS) of high frequency is especially serious, affect the service behaviour of frequency-selective surfaces, can not satisfy the requirement of communication quality.
Patent application " a kind of novel to the stable mixed type frequency-selective surfaces of the incidence angle " (application number: 201010168139.9 that BJ University of Aeronautics ﹠ Astronautics proposes, publication number: disclose a kind of novelly to the stable mixed type frequency-selective surfaces of incidence angle CN101834327A), this complementary type frequency selection surface structure is made of the metal square frame paster of periphery and inner annulus paster mixed type frequency-selective surfaces.But the weak point of this mixed type frequency-selective surfaces is, there is coupling between the construction unit of mixed type frequency-selective surfaces, when for the electromagnetic wave oblique incidence, along with the increase of incident angle, resonance frequency can be offset, and affects the service behaviour of frequency-selective surfaces.
The patent application " double-frequency polarization insensitive active frequency selective surface " that Southeast China University proposes (application number: 201010210448.8, publication number: disclose a kind of for the active frequency-selective surfaces of the insensitive dual frequency characteristics of polarization CN101894990A).This active frequency-selective surfaces is made of dielectric-slab and metal level, and metal level is placed in the front of dielectric-slab, and metal level is made of square metal patch and peripheral metal square frame paster, is loaded with electric capacity between the two and connects; The back side of dielectric-slab is provided with feeding network, and feeding network is made of four groups of spiral metal feeder lines that Central Symmetry distributes, and feeding network is connected through the square metal paster of metal throuth hole with the front.This structure can realize C-band and the X-band double-frequency resonance adjustable, realize the insensitive characteristic of polarization.But the deficiency that this double-frequency polarization insensitive active frequency selective surface still exists is, because depending on, frequency-selective surfaces loads lumped device and feeding network, the production and processing of lamped element exists certain error and useful life, needs regular maintenance;
The use of feeding network has increased the complexity of this structure, and periodic the expansion needs complicated feeding network.
The content of invention:
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of double frequency-band frequency-selective surfaces reflecting plate for reflector antenna is proposed, not only effectively broadening bandwidth of operation, and realize multi-band communication time work, keep the stability of oblique incidence angle and the stability of polarization.
The present invention is achieved in that
1, know-why
Realize that basic thought of the present invention is: generally, the external electromagnetic wave irradiation of a certain wavelength is to the frequency-selective surfaces unit, when the difference of the girth of frequency-selective surfaces unit and this electromagnetic wavelength is very little than the wavelength of incident wave.In theory, total reflection or total transmissivity will occur in incident electromagnetic wave on the surface of the array that is made of the frequency-selective surfaces unit, outside the resonance frequency band of frequency-selective surfaces, the array that is comprised of the frequency-selective surfaces unit will equivalence become air or metal flat.According to above-mentioned thought, the present invention proposes a kind of double frequency-band frequency-selective surfaces reflecting plate for reflector antenna, can satisfy the characteristic of two-frequency operation, and when electromagnetic wave is oblique when being mapped on the frequency-selective surfaces structure, resonance frequency and bandwidth of operation can not be affected substantially.
2, the structure that is used for the double frequency-band frequency-selective surfaces reflecting plate of reflector antenna
Reflecting plate of the present invention is sternly opened up rear formation by m * n reflecting plate unit along X, the Y-axis cycle at place, reflecting plate unit, and m 〉=40, n 〉=40 is characterized in that:
Each reflecting plate unit selects surface cell 1 and lower frequency to select surface cell 2 to consist of by media units 3, upper frequency; Upper frequency selects surface cell 1 to be coated in the upper surface of media units 3, and lower frequency selects surface cell 2 to be coated in the lower surface of media units 3; Upper frequency selects surface cell 1, lower frequency to select the length and width of surface cell 2 and media units 3 all identical;
Described media units 3 adopts relative dielectric constant ε
r=4.4 dielectric material, media units are a cuboid, and the length and width height is l * w * h, l=w wherein, and the span of the length and width w of media units is 4mm≤w≤12mm, the span of media units height h is 0.5mm≤h≤4mm.
Described upper frequency selects surface cell 1 to be comprised of four annulus pasters 4, annulus paster inside radius r
tiSpan be 0.6mm≤r
ti≤ 2mm, annulus paster outer radius r
toSpan be 0.8mm≤r
to≤ 3mm, annulus paster spacing distance w
tSpan be 2mm＜w
t≤ 5mm.
Described lower frequency selects surface cell 2 to consist of by square paster 5 with the wheel shape paster 6 of square paster center superposition.The center of wheel shape paster and the center superposition of square paster, and wheel shape paster is made of outer ring paster 7 and inner spoke paster 8.
The centre of described square paster 5 has circular hole, the center of circle of circular hole and the center superposition of square paster, and the span of square paster length of side w is 4mm≤w≤12mm, circle hole radius r
boSpan be 2.1mm≤r
to≤ 5.8mm.
Described outer ring paster 7 is distributed with the annulus paster of rectangular aperture for the excircle equal angles, annulus paster inside radius r
bmSpan be 0.6mm≤r
bm≤ 4mm, the outer radius r of annulus paster
biSpan be 0.9mm≤r
bi≤ 5mm; Interval angle between described rectangular aperture
Span be
The rectangular aperture length l
gSpan be 0.2mm≤l
g＜1mm, rectangular aperture width w
gSpan is 0.2mm≤w
g＜1mm.
Described inner spoke paster 8 is the rectangular patches that distribute around the center of outer ring paster equal angles at the inner periphery of outer ring paster 7, and the span of interval angle θ is 0 °＜θ＜180 °, the rectangular patch length l
rSpan be 2mm≤l
r＜7mm, width w
rSpan is 0.2mm≤w
r＜1.2mm, the center intersection of rectangular patch has circular hole, circle hole radius r
bcSpan be 0mm＜r
bc≤ 1mm.
The present invention adopts centrosymmetric annulus paster structure and the symmetrical rectangular patch of equal angles, can effectively overcome the unsettled problem of polarization characteristic that the existing different electromagnetic wave irradiation that polarizes produces, make the present invention can improve the communication quality of communication band under the difference polarization; Utilize simultaneously two kinds of different cellular constructions, and take the thought of hierarchy, can carry out independent analysis and research to dual frequency characteristics, can effectively overcome the coupled problem of the existing mutual mosaic texture of individual layer unit, increased the easy degree of design, made the present invention can better meet the communicating requirement of double frequency.
Description of drawings:
Fig. 1 is structural representation of the present invention;
Fig. 2 is reflecting plate unit three-dimensional structural representation of the present invention;
Fig. 3 is that upper frequency of the present invention is selected surperficial cellular construction schematic diagram;
Fig. 4 is that lower frequency of the present invention is selected surperficial cellular construction schematic diagram;
Fig. 5 is the analogous diagram of the present invention's reflection coefficient curve under the different polarization of low frequency frequency range, different angles;
Fig. 6 is the analogous diagram of the present invention's transmission coefficient curve under the different polarization of high-frequency band, different angles.
Embodiment:
The present invention will be further described below in conjunction with accompanying drawing.
With reference to accompanying drawing 1, reflecting plate is sternly opened up rear formation by m * n reflecting plate unit along X, the Y direction cycle at place, reflecting plate unit, wherein, m is that number is expanded in the cycle of X-axis in the reflecting plate unit, n is that number is expanded in the cycle of Y-axis in the reflecting plate unit, and m and n span are m 〉=40, n 〉=40, and the center distance of adjacent reflecting plate unit is w, w is the length of side of square paster 5, and the structure of each reflecting plate unit as shown in Figure 2.
With reference to accompanying drawing 2, the reflecting plate unit selects surface cell 1, lower frequency to select surface cell 2 and media units 3 to consist of by upper frequency, and wherein three's length and width is all identical, and is w.Upper frequency selects surface cell 1 to be coated in the upper surface of media units 3, structure as shown in Figure 3, wherein Fig. 3 (a) is the structure chart of upper frequency selection surface cell 1, Fig. 3 (b) is the structure chart of annulus paster; Lower frequency selects surface cell 2 to be coated in the lower surface of media units 3, structure as shown in Figure 4, wherein Fig. 4 (a) selects the structure chart of surface cell 2 for lower frequency, Fig. 4 (b) is the middle structure chart of opening round-meshed square paster 5, Fig. 4 (c) is the structure chart of wheel shape paster 6, Fig. 4 (d) is the structure chart of outer ring paster 7, and Fig. 4 (e) is the structure chart of inner spoke paster 8; Media units 3 is a cuboid, and the length and width height is l * w * h, l=w wherein, and the span of the length and width of media units is 4mm≤w≤12mm, the span of media units height h is 0.5mm≤h≤4mm.
With reference to accompanying drawing 3, the middle upper frequency of Fig. 3 (a) selects surface cell 1 to arrange according to rectangular array by four and the identical annulus paster 4 of size forms, spacing w each other
tSpan be 2mm＜w
t≤ 5mm.Annulus paster 4 inside radius r in Fig. 3 (b)
tiSpan be 0.6mm≤r
ti≤ 2mm, annulus paster 4 outer radius r
toSpan be 0.8mm≤r
to≤ 3mm.
With reference to accompanying drawing 4, wherein in Fig. 4 (a), lower frequency selects surface cell 2 to be combined to form by square paster 5 with the wheel shape paster 6 of square paster 5 center superpositions.In Fig. 4 (b), the span of square paster length of side w is 4mm≤w≤12mm, circle hole radius r
boSpan be 2.1mm≤r
to≤ 5.8mm.In Fig. 4 (c), wheel shape paster 6 is made of excircle equal angles outer ring paster 7 and inner spoke paster 8.In Fig. 4 (d), outer ring paster inside radius r
bmSpan be 0.6mm≤r
bm≤ 4mm, the outer radius r of outer ring paster
biSpan be 0.9mm≤r
bi≤ 5mm.Interval angle between rectangular aperture
Span be
The rectangular aperture length l
gSpan be 0.2mm≤l
g＜1mm, rectangular aperture width w
gSpan is 0.2mm≤w
g＜1mm.In Fig. 4 (e), inner spoke paster 8 is made of the rectangular patch at equal angles interval, and the span of interval angle θ is 0 °＜θ＜180 °; The rectangular patch length l
rSpan be 2mm≤l
r＜7mm, rectangular patch width w
rSpan is 0.2mm≤w
r＜1.2mm, circle hole radius r
bcSpan be 0mm＜r
bc≤ 1mm.
Embodiment 1: the operating frequency of sternly opening up the reflecting plate of rear formation along X, Y direction cycle by m * n reflecting plate unit is 20/44GHz, wherein number m=60 is expanded in the cycle of X-axis in the reflecting plate unit, number n=40 is expanded in cycle of Y-axis in the reflecting plate unit, the center distance w=4.4mm of adjacent reflecting plate unit.
Center distance in upper frequency selection surface cell 1 between annulus paster 4 is w
t=2.2mm, the outer radius value of annulus paster 4 is r
to=0.9mm, the inside radius value is r
ti=0.72mm.It is w=4.4mm that lower frequency is selected the length of side value of the square paster 5 in surface cell 2, and middle circle pore radius value is r
bo=2.1mm; The inside radius value of outer ring paster 7 is r
bm=1.1mm, the outer radius value is r
bi=1.6mm, the length value of the rectangular aperture on the paster of outer ring is l
g=0.4mm, the width value is w
g=0.4mm, the interval angle value between rectangular aperture is
The length value of inner spoke paster 8 is l
r=2.4mm, the width value is w
r=0.3mm, the interval angle value between the spoke paster is θ=45 °, the radius value of spoke paster intersection circular hole is r
bc=0.3mm.
Embodiment 2: the operating frequency of sternly opening up the reflecting plate of rear formation along X, Y direction cycle by m * n reflecting plate unit is 15/33GHz, wherein number m=50 is expanded in the cycle of X-axis in the reflecting plate unit, number n=40 is expanded in cycle of Y-axis in the reflecting plate unit, the center distance w=8mm of adjacent reflecting plate unit.
Center distance in upper frequency selection surface cell 1 between annulus paster 4 is w
t=4mm, the outer radius value of annulus paster 4 is r
to=1.8mm, the inside radius value is r
ti=1.5mm.It is w=8mm that lower frequency is selected the length of side value of the square paster 5 in surface cell 2, and middle circle pore radius value is r
bo=3.9mm; The inside radius value of outer ring paster 7 is r
bm=2.4mm, the outer radius value is r
bi=3mm, the length value of the rectangular aperture on the paster of outer ring is l
g=0.5mm, the width value is w
g=0.4mm, the interval angle value between rectangular aperture is
=30 °; The length value of inner spoke paster 8 is l
r=5.2mm, the width value is w
r=0.6mm, the interval angle value between the spoke paster is θ=45 °, the radius value of spoke paster intersection circular hole is r
bc=0.3mm.
Embodiment 3: the operating frequency of sternly opening up the reflecting plate of rear formation along X, Y direction cycle by m * n reflecting plate unit is 14/28GHz, wherein number m=40 is expanded in the cycle of X-axis in the reflecting plate unit, number n=40 is expanded in cycle of Y-axis in the reflecting plate unit, the center distance w=10mm of adjacent reflecting plate unit.
Center distance in upper frequency selection surface cell 1 between annulus paster 4 is w
t=5mm, the outer radius value of annulus paster 4 is r
to=2.3mm, the inside radius value is 1.9mm.It is w=10mm that lower frequency is selected the length of side value of the square paster 5 in surface cell 2, and middle circle pore radius value is r
bo=4.3mm; The inside radius value of outer ring paster 7 is r
bm=3mm, the outer radius value is r
bi=3.6mm, the length value of the rectangular aperture on the paster of outer ring is l
g=0.8mm, the width value is w
g=0.4mm, the interval angle value between rectangular aperture is
The length value of inner spoke paster 8 is l
r=6.2mm, the width value is w
r=1.1mm, the interval angle value between the spoke paster is θ=30 °, the radius value of spoke paster intersection circular hole is r
bc=0.6mm.
Further illustrate advantage of the present invention below by the emulation to embodiment 1:
1, the characteristic of reflecting plate bandwidth of the present invention
The designed double frequency-band frequency-selective surfaces of the present invention reflecting plate has advantages of broader bandwidth, sees Fig. 5 and Fig. 6.In the low frequency frequency range of 20GHz, Fig. 5 (a) provides under TM polarization-the 10dB bandwidth can reach 1.8GHz, and Fig. 5 (b) provides under the TE polarization-and the 10dB bandwidth can reach 0.8GHz; In the high-frequency band of 44GHz, Fig. 6 (a) provides under TM polarization-the 30dB bandwidth can reach 2.8GHz, and Fig. 6 (b) provides under the TE polarization-and the 30dB bandwidth can reach 3.5GHz.
2, the stability characteristic (quality) of multi-angle incident of the present invention
When plane wave with 0 °, 30 °, when 40 ° and 50 ° of incident, transmission coefficient of the present invention and reflection coefficient such as Fig. 5 and Fig. 6.Wherein in the low frequency frequency range of 20GHz, it is basicly stable at 21.2GHz that Fig. 5 provides the resonance frequency of frequency-selective surfaces of the present invention unit, and working band is 20.8GHz～21.6GHz; In the high-frequency band of 44GHz, it is basicly stable at 44GHz that Fig. 6 provides the resonance frequency of frequency-selective surfaces of the present invention unit, and working band is 42.5GHz～46GHz, this shows that the present invention has stable resonance frequency band and frequency selective characteristic.
These are only three examples of antenna of the present invention; do not consist of any limitation of the invention; obviously under design of the present invention; can modify to structure and parameter of the present invention; and then obtain broadening reflector antenna bandwidth, the characteristic that multi-angle is stable of can be applicable to of the present invention, but these are all at the row of protection of the present invention.
Claims (9)
1. double frequency-band frequency-selective surfaces reflecting plate that is used for reflector antenna, reflecting plate is by the X of m * n reflecting plate unit along place, reflecting plate unit, the Y-axis cycle is sternly opened up rear formation, m is that number is expanded in the cycle of X-axis in the reflecting plate unit, n is that number is expanded in the cycle of Y-axis in the reflecting plate unit, it is characterized in that, described each reflecting plate unit is by media units (3), upper frequency selects surface cell (1) and lower frequency to select surface cell (2) to consist of, media units (3) is positioned at upper frequency and selects surface cell (1) and lower frequency to select between surface cell (2), upper frequency selects surface cell (1), lower frequency to select the length and width of surface cell (2) and media units (3) all identical, upper frequency selects surface cell (1) to be comprised of four annulus pasters (4), lower frequency select surface cell (2) by square paster (5) and with wheel shape paster (6) formation of square paster center superposition.
2. the double frequency-band frequency-selective surfaces reflecting plate for reflector antenna according to claim 1, is characterized in that, number m, n span that the described reflecting plate cycle sternly opens up are m 〉=40, n 〉=40.
3. the double frequency-band frequency-selective surfaces reflecting plate for reflector antenna according to claim 1, is characterized in that, described media units (3) adopts relative dielectric constant ε
rBe 4.4 dielectric substance, media units is a cuboid, and the length and width height is l * w * h, l=w wherein, and the span of the length and width w of media units is 4mm≤w≤12mm, the span of media units height h is 0.5mm≤h≤4mm.
4. the double frequency-band frequency-selective surfaces reflecting plate for reflector antenna according to claim 1, it is characterized in that, described upper frequency selects surface cell (1) to be made of the identical annulus pasters of four shapes (4) of arranging according to rectangular array, wherein annulus paster (4) inside radius r
tiSpan be 0.6mm≤r
ti≤ 2mm, annulus paster (4) outer radius r
toSpan be 0.8mm≤r
to≤ 3mm, the spacing distance w of annulus paster (4)
tSpan be 2mm＜w
t≤ 5mm.
5. the double frequency-band frequency-selective surfaces reflecting plate for reflector antenna according to claim 1, it is characterized in that, described lower frequency selects surface cell (2) to consist of by square paster (5) with the wheel shape paster (6) of square paster center superposition.
6. the double frequency-band frequency-selective surfaces reflecting plate for reflector antenna according to claim 5, it is characterized in that, the centre of described square paster (5) has circular hole, the center of circle of circular hole and the center superposition of square paster, the span of square paster length of side w is 4mm≤w≤12mm, circle hole radius r
boSpan be 2.1mm≤r
to≤ 5.8mm.
7. the double frequency-band frequency-selective surfaces reflecting plate for reflector antenna according to claim 5, it is characterized in that, the center superposition of the center of described wheel shape paster (6) and square paster (5), wheel shape paster (6) is made of outer ring paster (7) and inner spoke paster (8).
8. the double frequency-band frequency-selective surfaces reflecting plate for reflector antenna according to claim 7, is characterized in that, described outer ring paster (7) is distributed with the annulus paster of rectangular aperture for the excircle equal angles, annulus paster inside radius r
bmSpan be 0.6mm≤r
bm≤ 4mm, the outer radius r of annulus paster
biSpan be 0.9mm≤r
bi≤ 5mm; Interval angle between described rectangular aperture
Span be
The rectangular aperture length l
gSpan be 0.2mm≤l
g＜1mm, rectangular aperture width w
gSpan is 0.2mm≤w
g＜1mm.
9. the double frequency-band frequency-selective surfaces reflecting plate for reflector antenna according to claim 7, it is characterized in that, described inner spoke paster (8) is the rectangular patch that distributes around the center of outer ring paster equal angles at the inner periphery of outer ring paster (7), the span of interval angle θ is 0 °＜θ＜180 °, the rectangular patch length l
rSpan be 2mm≤l
r＜7mm, width w
rSpan is 0.2mm≤w
r＜1.2mm, the center intersection of rectangular patch has circular hole, circle hole radius r
bcSpan be 0mm＜r
bc≤ 1mm.
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| CN105706006A (en) * | 2013-11-07 | 2016-06-22 | 格兰富控股联合股份公司 | Diagnostic method for diagnosing the correct operation of a heating and/or cooling system |
| WO2018064836A1 (en) * | 2016-10-09 | 2018-04-12 | 华为技术有限公司 | Frequency selective surface |
| CN108281797A (en) * | 2017-12-08 | 2018-07-13 | 西安电子科技大学 | High angle stability frequency-selective surfaces based on 2.5D braiding structures |
| CN109755757A (en) * | 2019-03-07 | 2019-05-14 | 西安电子科技大学 | Wideband encoding folding mirror array antenna based on sub-wavelength single layer reflector element |
| US10770781B1 (en) | 2019-02-26 | 2020-09-08 | Microsoft Technology Licensing, Llc | Resonant cavity and plate hybrid antenna |
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| CN101894990A (en) * | 2010-06-24 | 2010-11-24 | 东南大学 | Double-frequency polarization insensitive active frequency selective surface |
| CN102904063A (en) * | 2012-10-15 | 2013-01-30 | 西安电子科技大学 | Reflecting plate based on frequency selection surface units |
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| CN102904063A (en) * | 2012-10-15 | 2013-01-30 | 西安电子科技大学 | Reflecting plate based on frequency selection surface units |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105706006A (en) * | 2013-11-07 | 2016-06-22 | 格兰富控股联合股份公司 | Diagnostic method for diagnosing the correct operation of a heating and/or cooling system |
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| US11054150B2 (en) | 2013-11-07 | 2021-07-06 | Grundfos Holding A/S | Diagnostic method for diagnosing the correct operation of a heating and/or cooling system |
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| CN108281797B (en) * | 2017-12-08 | 2019-11-15 | 西安电子科技大学 | High angle stability frequency-selective surfaces based on 2.5D braiding structure |
| US10770781B1 (en) | 2019-02-26 | 2020-09-08 | Microsoft Technology Licensing, Llc | Resonant cavity and plate hybrid antenna |
| CN109755757A (en) * | 2019-03-07 | 2019-05-14 | 西安电子科技大学 | Wideband encoding folding mirror array antenna based on sub-wavelength single layer reflector element |
| CN109755757B (en) * | 2019-03-07 | 2020-11-24 | 西安电子科技大学 | Broadband coding folding reflective array antenna based on sub-wavelength single-layer reflection unit |
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| CN103151618B (en) | 2014-12-17 |
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