CN113067111A - Nested dual-frequency selection surface - Google Patents
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- CN113067111A CN113067111A CN202110271806.4A CN202110271806A CN113067111A CN 113067111 A CN113067111 A CN 113067111A CN 202110271806 A CN202110271806 A CN 202110271806A CN 113067111 A CN113067111 A CN 113067111A
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Abstract
The invention discloses a nested dual-frequency selective surface. The frequency selective surface comprises a dielectric substrate and a metal surface arranged on the upper surface of the dielectric substrate; the metal surface is etched with an external folding ring-shaped gap and an internal Yelu cooling type gap, wherein the folding ring-shaped gap is in an axisymmetric and centrosymmetric gap structure, and the overall shape of the metal surface is composed of a left folding gap, a right folding gap, an upper folding gap and a lower folding gap; the Jerson cooling type gap is an axisymmetric and centrosymmetric gap structure, and the whole shape of the Jerson cooling type gap is composed of four Pi-shaped gaps with T-shaped patches etched away. The dielectric substrate adopts Rogers RT/duroid 5880 with the dielectric constant of 2.2. The invention can realize the double-frequency characteristic and has good passing performance in the pass band; in addition, when electromagnetic waves with large angles and different polarization modes are incident, the frequency selection can show stable filtering characteristics.
Description
Technical Field
The invention relates to the technical field of microwave frequency selection surfaces, in particular to a nested dual-frequency selection surface.
Background
The frequency selective surface is used as a passive device and can present the filtering characteristics of band-pass and band-stop for electromagnetic waves with different incident frequencies. According to the advantages that the Frequency selection can effectively control the transmission and reflection of electromagnetic waves, the Frequency selection is applied to a radar stealth Radome (N.Liu, X.Sheng, C.Zhang and D.Guo, "Design of Frequency Selective Surface Structure With High analog Stability for radar Application," in IEEE Antennas and Wireless processing Letters, vol.17, No.1, pp.138-141, Jan.2018, doi:10.1109/LAWP.2017.2778078), and the electromagnetic protection capability of a Radome system is improved; the method is applied to a reflector antenna system, is convenient for improving the system capacity of the reflector antenna, and has wide application prospect in missile-borne communication and satellite communication.
With the continuous innovation of national defense technology in recent years, many antenna systems require dual-band simultaneous operation, and dual-band frequency selection also becomes the focus of research of many experts and scholars. In terms of structure, the traditional Dual-Frequency selection has large volume and complex structure (Y.Chen, L.Chen, H.Wang, X.Gu and X.Shi, "Dual-Band cross-polarized reflective With Dual-Band Frequency Selective Surface," in IEEE Antennas and Wireless processing Letters, vol.12, pp.1157-1160,2013, doi:10.1109/LAWP.2013.2280891), and is difficult to integrate With devices such as an antenna housing, a reflecting plate and the like; in the aspect of performance, the traditional dual-frequency selection is difficult to cope with large-angle incidence, and cannot present stable filtering response to electromagnetic waves of different polarization modes.
Disclosure of Invention
The invention aims to provide a nested dual-frequency selection surface which is small in size, simple in structure and good and stable in performance.
The technical solution for realizing the purpose of the invention is as follows: a nested dual-frequency selective surface comprises a dielectric substrate and a metal surface arranged on the upper surface of the dielectric substrate; the metal surface is etched with an external folding ring-shaped gap and an internal Yelu cooling type gap, wherein the folding ring-shaped gap is in an axisymmetric and centrosymmetric gap structure, and the overall shape of the metal surface is composed of a left folding gap, a right folding gap, an upper folding gap and a lower folding gap; the Jerson cooling type gap is an axisymmetric and centrosymmetric gap structure, and the whole shape of the Jerson cooling type gap is composed of four Pi-shaped gaps with T-shaped patches etched away.
Further, the dielectric substrate adopts Rogers RT/duroid 5880 with the dielectric constant of 2.2.
Furthermore, the folding ring-shaped gap consists of a left folding gap, a lower folding gap, a right folding gap and an upper folding gap;
the folding gap in left side is formed by nine short gap end to end connections altogether, and concrete composition mode is: bending the first gap in the vertical direction to the second gap rightwards, then bending the first gap to the third gap downwards, bending the first gap to the fourth gap leftwards, bending the first gap to the fifth gap downwards, bending the first gap to the sixth gap rightwards, bending the first gap to the seventh gap downwards, bending the first gap to the eighth gap leftwards, and bending the first gap to the ninth gap downwards; the first gap and the ninth gap have the same size, and the numerical value meets k times of 1.3 mm; the second gap, the fourth gap, the sixth gap and the eighth gap have the same size, and the numerical value meets k times of 0.5 mm; the third gap and the seventh gap have the same size, and the numerical value meets k times of 0.5 mm; the size value of the fifth gap is k times of 0.8mm, and k is a positive integer;
the structure size of the lower side folding gap, the right side folding gap and the upper side folding gap is completely the same as that of the left side folding gap.
Further, the Jelu scattering cold type gap is composed of a left side Pi-shaped gap, a lower side Pi-shaped gap, a right side Pi-shaped gap and an upper side Pi-shaped gap;
the pi gap on the left side consists of 7 short gaps, and the specific composition mode is as follows: bending the eleventh slit in the vertical direction to the twelfth slit, bending the eleventh slit to the thirteenth slit, bending the thirteenth slit to the fourteenth slit, bending the fourteenth slit to the fifteenth slit, bending the sixteenth slit to the sixteenth slit and bending the seventeenth slit to the left, wherein the fourteenth slit is symmetrical to the fifteenth slit about the horizontal line; wherein the size of the eleventh slit has a value k times 1.6 mm; the twelfth gap and the seventeenth gap have the same size, and the numerical value meets k times of 0.6 mm; the thirteenth gap and the sixteenth gap have the same size, and the numerical value meets k times of 0.7 mm; the fourteenth gap and the fifteenth gap have the same size, the numerical value meets k times of 1mm, and k is a positive integer;
the structure size of the lower side pi-shaped gap, the structure size of the right side pi-shaped gap and the structure size of the upper side pi-shaped gap are completely the same as those of the left side pi-shaped gap.
Further, the metal surface has a length of 3mm and a width of 3 mm.
Further, the lengths of the first gap and the ninth gap are 1.3mm, the lengths of the second gap, the fourth gap, the sixth gap and the eighth gap are 0.5mm, the lengths of the third gap and the seventh gap are 0.5mm, and the length of the fifth gap is 0.8 mm.
Further, the length of the eleventh slit is 1.6mm, the length of the twelfth slit and the seventeenth slit is 0.6mm, the length of the thirteenth slit and the sixteenth slit is 0.7mm, and the length of the fourteenth slit and the fifteenth slit is 1 mm.
Compared with the prior art, the invention has the following remarkable advantages: (1) compared with a cascade frequency selection unit, the nested frequency selection unit is adopted, the dual-frequency characteristic can be realized only by loading one layer of dielectric substrate, and the overall structure is simpler; (2) a folding structure is added in the frequency selection unit, so that the structure miniaturization is realized under the condition of ensuring that the frequency selection working frequency band is not changed, and the integration with other equipment is facilitated; (3) the external gap of the dual-frequency selection realizes low frequency, the internal gap realizes high frequency, the two frequency bands can work independently, and good angle stability and polarization stability can be realized; (4) the band-pass filtering characteristics of higher/lower frequency bands can be realized by adjusting the sizes of the two units, and the band-pass filtering device has stronger applicability and popularization.
Drawings
Fig. 1 is a structural diagram of a nested dual-frequency selective surface of the present invention, in which (a) is a top view and (b) is a left view.
Fig. 2 is a structural view of an outer folding ring type slit in the present invention, wherein (a) is an overall outline and (b) is a structural view of a left side slit.
FIG. 3 is a block diagram of the internal Yellowski slot of the present invention, wherein (a) is the overall profile and (b) is the left slot leg.
FIG. 4 is a comparison of multi-angle filtering performance when the incident wave is in TE mode, wherein (a) is a reflection coefficient comparison graph and (b) is a transmission coefficient comparison graph.
FIG. 5 is a comparison of multi-angle filtering performance when the incident wave is in TM mode, wherein (a) is a reflection coefficient comparison graph and (b) is a transmission coefficient comparison graph.
Detailed Description
Compared with the traditional frequency selection unit, the nested dual-frequency selection surface has a simple structure and a small volume. The folding structure is added in the gap to realize miniaturization, and the two pass bands can be independently adjustable, so that the antenna has good angle stability and polarization stability.
With reference to fig. 1 to 3, a nested dual-frequency selective surface of the present invention includes a dielectric substrate 2 and a metal surface 1 disposed on an upper surface thereof; an external folding ring-shaped gap 11 and an internal Yelu spray-cooling type gap 12 are etched on the metal surface 1, wherein the folding ring-shaped gap 11 is of an axisymmetric and centrosymmetric gap structure, and the overall shape of the metal surface is composed of a left folding gap, a right folding gap, an upper folding gap and a lower folding gap; the Jerson cold type slit 12 is an axisymmetric and centrosymmetric slit structure, and the whole shape is composed of four Pi type slits with T type patches etched away.
In one embodiment, the dielectric substrate 2 is Rogers RT/duroid 5880 with a dielectric constant of 2.2.
In one embodiment, the folding ring-shaped slit 11 is composed of a left folding slit 111, a lower folding slit 112, a right folding slit 113, and an upper folding slit 114;
folding gap 111 in left side is formed by nine short gap end to end connections altogether, and concrete composition mode is: the first slit 1111 in the vertical direction is bent rightwards to the second slit 1112, then bent downwards to the third slit 1113, bent leftwards to the fourth slit 1114, bent downwards to the fifth slit 1115, bent rightwards to the sixth slit 1116, bent downwards to the seventh slit 1117, bent leftwards to the eighth slit 1118, and bent downwards to the ninth slit 1119; the first gap 1111 and the ninth gap 1119 have the same size, and the value meets k times of 1.3 mm; the second gap 1112, the fourth gap 1114, the sixth gap 1116 and the eighth gap 1118 have the same size, and the numerical value satisfies k times of 0.5 mm; the third gap 1113 and the seventh gap 1117 have the same size, and the numerical value meets k times of 0.5 mm; the size value of the fifth gap 1115 is k times of 0.8mm, and k is a positive integer;
the lower folding slit 112, the right folding slit 113 and the upper folding slit 114 have the same structural dimensions as the left folding slit 111.
In one embodiment, the yersinic-type slot 12 is comprised of a left-side pi-shaped slot 121, a lower-side pi-shaped slot 122, a right-side pi-shaped slot 123, and an upper-side pi-shaped slot 124;
the left pi gap 121 is composed of 7 short gaps, and the specific composition mode is as follows: bending the eleventh slit 1211 in the vertical direction to the twelfth slit 1212, bending the eleventh slit 1211 to the thirteenth slit 1213, bending the fourteenth slit 1214 to the fourteenth slit 1214, bending the fourteenth slit 1214 to the fifteenth slit 1215, bending the sixteenth slit 1216, and bending the seventeenth slit 1217; wherein the size value of the eleventh slit 1211 is k times of 1.6 mm; the twelfth slit 1212 and the seventeenth slit 1217 have the same size, and satisfy k times of 0.6 mm; the thirteenth slit 1213 is the same size as the sixteenth slit 1216, and the number satisfies k times of 0.7 mm; the fourteenth gap 1214 and the fifteenth gap 1215 have the same size, the numerical value meets k times of 1mm, and k is a positive integer;
the structure sizes of the lower pi-shaped gap 122, the right pi-shaped gap 123 and the upper pi-shaped gap 124 are completely the same as those of the left pi-shaped gap 121.
In a particular embodiment, the metal surface 1 has a length of 3mm and a width of 3 mm.
In one embodiment, the first slot 1111 and the ninth slot 1119 have a length of 1.3mm, the second slot 1112, the fourth slot 1114, the sixth slot 1116 and the eighth slot 1118 have a length of 0.5mm, the third slot 1113 and the seventh slot 1117 have a length of 0.5mm, and the fifth slot 1115 have a length of 0.8 mm.
In one embodiment, the length of the eleventh slit 1211 is 1.6mm, the lengths of the twelfth slit 1212 and the seventeenth slit 1217 are 0.6mm, the lengths of the thirteenth slit 1213 and the sixteenth slit 1216 are 0.7mm, and the lengths of the fourteenth slit 1214 and the fifteenth slit 1215 are 1 mm.
The dual-frequency selective surface is realized by adopting a nested structure, and the dual-frequency selective surface has the advantages of simple structure and small volume. The inner and outer gap structures respectively realize the filtering characteristics of high and low frequency bands, and the inner and outer gap structures are independently adjustable. A folding structure is added into the unit to realize miniaturization, and finally the frequency selection has good angle stability and polarization stability in a pass band.
The invention is described in further detail below with reference to the figures and the specific examples.
Examples
With reference to fig. 1(a) - (b), fig. 2(a) - (b), and fig. 3(a) - (b), the nested dual-frequency selective substrate comprises a metal unit 1 and a dielectric substrate 2 with etched gaps. The metal unit 1 for etching the gap is formed by etching away metal of an external folding ring-shaped gap 11 and an internal Yellowski-type gap 12; the dielectric substrate 2 adopts Rogers RT/duroid 5880 with the dielectric constant of 2.2.
The folding ring-shaped slit 11 has an axisymmetric and centrosymmetric slit structure, and the overall shape thereof is composed of four identical left folding slits 111, lower folding slits 112, right folding slits 113 and upper folding slits 114. Taking the left folding slit 111 as an example for explanation, the folding slit 111 is formed by connecting nine short slits end to end. The concrete composition mode is as follows: the first bending from the vertical slit 1111 to the right to the slit 1112, then to the slit 1113, to the left to the slit 1114, to the slit 1115, to the right to the slit 1116, to the slit 1117, to the left to the slit 1118, and to the slit 1119.
The yarrow cooling gap 12 is an axisymmetric and centrosymmetric gap structure, and the overall shape of the yarrow cooling gap is composed of a left pi-shaped gap 121, a lower pi-shaped gap 122, a right pi-shaped gap 123 and an upper pi-shaped gap 124. Taking the left pi-slot 121 as an example, the slot is composed of 7 short slots. The concrete composition mode is as follows: the slit 1211 is bent from the vertical direction to the right to the slit 1212, then bent upward to the slit 1213, bent rightward to the slit 1214, and the slit 1214 is bent upward to the slit 1215, 1216, and bent leftward to the slit 1217, with respect to the horizontal line.
The parameter design process of the nested dual-frequency selection surface is as follows:
the edge length of the metal unit 1 is 3mm, and the edge width is 3 mm.
The dielectric substrate 2 (II) is Rogers RT/duroid 5880 with a dielectric constant of 2.2 and a thickness of 0.508 mm.
And (III) the width of the external folding gap of the metal unit 1 is 0.2mm, and the width of the internal folding gap is 0.2 mm.
(IV) of the outer folded slits 11, the left folded slit 111, slits 1111 and 1119 have a length of 1.3mm, slits 1112 and 1114, slits 1116 and 1118 have a length of 0.5mm, slits 1113 and 1117 have a length of 0.5mm, and slit 1115 has a length of 0.8 mm.
(V) left slot limb 121 in inner Yellows-cooling slot 12, slot 1211 is 1.6mm long, slots 1212 and 1217 are 0.6mm long, slots 1213 and 1216 are 0.7mm long, and slots 1214 and 1215 are 1mm long.
The electromagnetic waves with incident angles of 0 degree, 15 degrees, 30 degrees, 45 degrees and 60 degrees and polarization modes of TE and TM modes are irradiated to the nested dual-frequency selection surface, multi-angle filtering performance comparison is given in the graphs 4(a) and 4 (b) when the incident waves are in the TE modes, multi-angle filtering performance comparison is given in the graphs 5(a) and 5 (b) when the incident waves are in the TM modes, and the frequency selection can generate good and stable resonance effects at 10.35GHz and 15.65GHz, and has good angle stability and polarization stability.
Claims (7)
1. A nested dual-frequency selective surface is characterized by comprising a dielectric substrate (2) and a metal surface (1) arranged on the upper surface of the dielectric substrate; an external folding ring-shaped gap (11) and an internal spray cooling type gap (12) are etched on the metal surface (1), wherein the folding ring-shaped gap (11) is of an axisymmetric and centrosymmetric gap structure, and the overall shape of the metal surface is composed of a left folding gap, a right folding gap, an upper folding gap and a lower folding gap; the Jerson cold type gap (12) is an axisymmetric and centrosymmetric gap structure, and the whole shape of the Jerson cold type gap is composed of four Pi type gaps with T-shaped patches etched away.
2. The nested dual-frequency selective surface according to claim 1, wherein the dielectric substrate (2) employs Rogers RT/duroid 5880 with a dielectric constant of 2.2.
3. The nested dual-frequency selective surface according to claim 1, wherein the folded-loop slot (11) is composed of a left folded slot (111), a lower folded slot (112), a right folded slot (113), and an upper folded slot (114);
folding gap (111) in left side is formed by nine short gap end to end connections altogether, and concrete composition mode is: the first gap (1111) in the vertical direction is bent rightwards to the second gap (1112), then is bent downwards to the third gap (1113), is bent leftwards to the fourth gap (1114), is bent downwards to the fifth gap (1115), is bent rightwards to the sixth gap (1116), is bent downwards to the seventh gap (1117), is bent leftwards to the eighth gap (1118), and is bent downwards to the ninth gap (1119); wherein the first gap (1111) and the ninth gap (1119) have the same size, and the value meets k times of 1.3 mm; the second gap (1112), the fourth gap (1114), the sixth gap (1116) and the eighth gap (1118) have the same size, and the numerical value meets k times of 0.5 mm; the third gap (1113) and the seventh gap (1117) have the same size, and the numerical value meets k times of 0.5 mm; the size value of the fifth gap (1115) is k times of 0.8mm, and k is a positive integer;
the lower side folding gap (112), the right side folding gap (113) and the upper side folding gap (114) are completely the same as the left side folding gap (111) in structural size.
4. The nested dual-frequency selective surface according to claim 1, wherein the yersinic-type slot (12) is composed of a left-side pi-type slot (121), a lower-side pi-type slot (122), a right-side pi-type slot (123), an upper-side pi-type slot (124);
the left pi gap (121) is composed of 7 short gaps, and the specific composition mode is as follows: bending the eleventh slit 1211 in the vertical direction to the twelfth slit 1212, bending the eleventh slit 1213 to the thirteenth slit 1214, bending the fourteenth slit 1214 to the fifteenth slit 1215 in a symmetrical manner with respect to the horizontal line, bending the sixteenth slit 1216 to the sixteenth slit 1217, and bending the seventeenth slit 1217 to the left; wherein the size value of the eleventh slit (1211) is k times of 1.6 mm; the twelfth slit (1212) and the seventeenth slit (1217) have the same size, and the value satisfies k times of 0.6 mm; the thirteenth gap (1213) is the same size as the sixteenth gap (1216), and the value satisfies k times of 0.7 mm; the fourteenth gap (1214) and the fifteenth gap (1215) have the same size, the numerical value meets k times of 1mm, and k is a positive integer;
the structure size of the lower side pi-shaped gap (122), the structure size of the right side pi-shaped gap (123) and the structure size of the upper side pi-shaped gap (124) are completely the same as that of the left side pi-shaped gap (121).
5. The nested dual-frequency selective surface according to claim 1, characterized in that the metal surface (1) has a length of 3mm and a width of 3 mm.
6. The nested dual-frequency selective surface of claim 5, wherein the first slot (1111) and the ninth slot (1119) have a length of 1.3mm, the second slot (1112), the fourth slot (1114), the sixth slot (1116) and the eighth slot (1118) have a length of 0.5mm, the third slot (1113) and the seventh slot (1117) have a length of 0.5mm, and the fifth slot (1115) have a length of 0.8 mm.
7. The nested dual-frequency selective surface according to claim 6, wherein the eleventh slot (1211) has a length of 1.6mm, the twelfth slot (1212) and the seventeenth slot (1217) have a length of 0.6mm, the thirteenth slot (1213) and the sixteenth slot (1216) have a length of 0.7mm, and the fourteenth slot (1214) and the fifteenth slot (1215) have a length of 1 mm.
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Cited By (1)
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| CN113745778A (en) * | 2021-09-03 | 2021-12-03 | 合肥工业大学 | Dual-band polarization sensitive band-stop filter and preparation method thereof |
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