CN112490676A - Adjustable planar antenna with filtering function - Google Patents
Adjustable planar antenna with filtering function Download PDFInfo
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- CN112490676A CN112490676A CN202011434703.7A CN202011434703A CN112490676A CN 112490676 A CN112490676 A CN 112490676A CN 202011434703 A CN202011434703 A CN 202011434703A CN 112490676 A CN112490676 A CN 112490676A
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- 238000001914 filtration Methods 0.000 title claims abstract description 41
- 239000000758 substrate Substances 0.000 claims abstract description 115
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 65
- 239000011521 glass Substances 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 description 21
- 238000002955 isolation Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 4
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- 238000004519 manufacturing process Methods 0.000 description 2
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- 230000005540 biological transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008451 emotion Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching
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Abstract
The invention provides an adjustable planar antenna with a filtering function, which comprises a first substrate, a signal feed-in line, a first electrode, a second electrode and a liquid crystal layer. The first substrate comprises a first surface and a second surface, the signal feed-in line is arranged on the first surface, and the first electrode is arranged on the second surface. The first electrode includes a first electrode layer, an auxiliary electrode layer, an insulating layer, and a second electrode layer. The auxiliary electrode layer is arranged in the slot of the first electrode layer and is electrically connected with the first electrode layer. The insulating layer is arranged on the first electrode layer and the auxiliary electrode layer, and the second electrode layer is arranged on the insulating layer. The second electrode overlaps the slot. The liquid crystal layer is arranged between the first electrode and the second electrode.
Description
Technical Field
The present invention relates to an adjustable planar antenna with filtering function, and more particularly to an adjustable planar antenna including an isolation capacitor structure for preventing a liquid crystal driving circuit from being affected by a radio frequency signal circuit.
Background
The planar dipole antenna adopts an electronic non-mechanical rotation beam scanning mode, and has the advantages of high stability, increased beam gain along with the increase of the number of antenna units, small size and high integration degree. Can be applied in the fields of millimeter wave radar of an Automatic Driving Assistance System (ADAS), automatic navigation of an unmanned plane out-of-line (BVLOS) and remote monitoring of physiological characteristics (Vital sign), further providing remote emotion monitoring, wireless power transmission (wireless power transfer), fifth generation mobile communication and the like,
the antenna unit of the planar dipole antenna mainly utilizes a material with a tunable dielectric constant (e.g. liquid crystal) filled around the electrodes, and utilizes a voltage to control the rotation direction of liquid crystal molecules, so as to change the dielectric constant of the liquid crystal material and further change the capacitance value in the resonant circuit, thereby enabling the resonant frequencies to be different. In other words, different control voltages are applied to the liquid crystal, so that the antenna units can generate different resonant frequency responses, adjust the proper antenna operating frequency, control the electromagnetic wave radiation intensity, arrange the antenna units in an array manner, and control the switches of the antenna units to achieve the beam scanning function at a specific angle.
The invention improves the defects of the prior art by designing the adjustable planar antenna with the filtering function, thereby enhancing the implementation and utilization of the industry.
Disclosure of Invention
In view of the above-mentioned problems of the prior art, an object of the present invention is to provide a tunable planar antenna with filtering function, which has an isolation capacitor structure to solve the problem of interference between the liquid crystal driving circuit and the rf circuit.
In accordance with the above objectives, an embodiment of the present invention provides a tunable planar antenna with filtering function, which includes a first substrate, a signal feed line, a first electrode, a second electrode and a liquid crystal layer. The first substrate comprises a first surface and a second surface opposite to the first surface, and the signal feed-in line is arranged on the first surface. The first electrode is arranged on the second surface and overlapped with the signal feed-in line, and comprises a first electrode layer, an auxiliary electrode layer, an insulating layer and a second electrode layer. The first electrode layer is provided with a slot, the auxiliary electrode layer is arranged in the slot, the auxiliary electrode layer is electrically connected with the first electrode layer, and the auxiliary electrode layer and the first electrode layer belong to the same conductive electrode layer. The insulating layer is arranged on the first electrode layer and the auxiliary electrode layer, and the second electrode layer is arranged on the insulating layer. The second electrode is arranged on the second surface and overlapped with the slotted hole, and the second electrode faces the second electrode layer. The liquid crystal layer is arranged between the first electrode and the second electrode.
In an embodiment of the invention, the first electrode, the liquid crystal layer, and the second electrode may be sequentially stacked on the second surface, wherein the second electrode may be annular, and the second electrode partially overlaps the auxiliary electrode layer. In another embodiment, the auxiliary electrode layer may be annular, and the auxiliary electrode layer partially overlaps the second electrode.
In an embodiment of the invention, the second electrode, the liquid crystal layer, and the first electrode may be sequentially stacked on the second surface, wherein the second electrode may be annular, and the second electrode partially overlaps the auxiliary electrode layer. In another embodiment, the auxiliary electrode layer may be annular, and the auxiliary electrode layer partially overlaps the second electrode.
In the embodiment of the invention, the second electrode, the first electrode layer and the auxiliary electrode layer have an overlapping area therebetween, and the area of the second electrode layer may be greater than 0.1 times the overlapping area.
In an embodiment of the present invention, the area of the second electrode layer may be the same as the area of the first electrode layer.
In an embodiment of the present invention, the thickness of the first electrode layer may be 7 to 30 times the thickness of the second electrode layer.
In an embodiment of the invention, the tunable planar antenna with filtering function may further include a second substrate, and the first electrode, the liquid crystal layer and the second electrode are disposed between the first substrate and the second substrate.
In an embodiment of the invention, the tunable planar antenna with filtering function may further include a third substrate, and the signal feed line is disposed between the first substrate and the third substrate.
In an embodiment of the invention, the first substrate, the second substrate and the third substrate may be glass substrates.
In view of the above, according to the adjustable planar antenna with filtering function provided by the embodiment of the present invention, the first electrode layer, the insulating layer and the second electrode layer may be disposed on the first electrode to form a plate capacitor structure, and an isolation capacitor between the liquid crystal driving circuit and the signal feeding circuit is formed by the plate capacitor structure. The adjustable planar antenna with the structure can effectively shorten the transient time of the square wave and reduce the required charging time.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
Fig. 1A, 1B, and 1C are schematic diagrams of a tunable planar antenna with filtering function according to an embodiment of the present invention.
Fig. 2A and 2B are schematic diagrams of a tunable planar antenna with filtering function according to another embodiment of the present invention.
Fig. 3A and 3B are schematic diagrams of a tunable planar antenna with filtering function according to another embodiment of the present invention.
Fig. 4A and 4B are schematic diagrams of a tunable planar antenna with filtering function according to still another embodiment of the present invention.
Fig. 5A and 5B are schematic diagrams of a tunable planar antenna with filtering function according to still another embodiment of the present invention.
Fig. 6A and 6B are schematic diagrams of a tunable planar antenna with filtering function according to still another embodiment of the present invention.
Wherein, the reference numbers:
1,2,3,4,5,6 adjustable plane antenna
11,21,31,41,51,61 first electrode
12,22,32,42,52,62 second electrode
15,25,35,45,55,65 slotted holes
15L,25L,35L,45L,55L,65L connecting line
111,211,311,411,511,611 first electrode layer
112,212,312,412,512,612 auxiliary electrode layer
113,113A,213,213A,313,313A,413,413A,513,513A,613,613A insulating layer
114,114A, 214A,314,314A, 414A,514,514A,614,614A the second electrode layer
LC-LC layer
SB1 first substrate
SB2 second substrate
SB3 third base plate
SL signal feed-in line
A-A ', B-B', C-C ', D-D', E-E ', F-F': dotted line
Detailed Description
For a better understanding of the technical features, objects, and advantages of the present invention, as well as the advantages thereof, reference will be made to the following detailed description of the preferred embodiments of the present invention, which is illustrated in the accompanying drawings, wherein the same is for the purpose of illustration and description only, and is not intended to be exhaustive or to limit the invention to the precise forms disclosed, and the same should not be construed as limited by the scope of the appended claims.
In the drawings, the thickness or width of layers, films, panels, regions, light guides, and the like are exaggerated for clarity. Like reference numerals refer to like elements throughout the specification. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected" to another element, there are no intervening elements present. As used herein, "connected," can refer to physical and/or electrical connections. Further, an "electrical connection" or "coupling" may be the presence of other elements between two elements. Further, it will be understood that, although the terms "first", "second", "third" and/or the like may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should be used to distinguish one element, component, region, layer and/or section from another element, component, region, layer and/or section. Therefore, they are used for descriptive purposes only and not to be construed as indicating or implying relative importance or order relationships thereof.
Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present invention and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:
fig. 1A to fig. 1C are schematic diagrams of a tunable planar antenna with self-filtering function according to an embodiment of the present invention, where fig. 1A is a schematic plan view of the tunable planar antenna with self-filtering function, fig. 1B is a schematic cross-sectional view taken along a dotted line a-a 'in fig. 1A, and fig. 1C is a schematic cross-sectional view taken along a dotted line a-a' in fig. 1A according to another embodiment. As shown in the figure, the tunable planar antenna 1 includes a first substrate SB1, a signal feed line SL, a first electrode 11, a second electrode 12, and a liquid crystal layer LC, wherein the signal feed line SL is disposed on a lower surface of the first substrate SB1, the first electrode 11 is disposed on an upper surface of the first substrate SB1, and the first electrode 11 overlaps the signal feed line SL. The first electrode 11 includes a first electrode layer 111, an auxiliary electrode layer 112, an insulating layer 113, and a second electrode layer 114, wherein the first electrode layer 111 has a hollow slot 15 structure, a receiving space is formed in the first electrode layer 111, and the auxiliary electrode layer 112 is disposed in the receiving space formed by the slot 15. The auxiliary electrode layer 112 may be a rectangular structure, and the side of the rectangle is separated from the first electrode layer 111 and is electrically connected to the first electrode layer 111 only through the connection line 15L. The first electrode layer 111 and the auxiliary electrode layer 112 belong to the same conductive electrode layer, and may be disposed on the upper surface of the first substrate SB1 in the same process. In addition, an insulating layer 113 and a second electrode layer 114 are sequentially disposed on the first electrode layer 111, and an insulating layer 113A and a second electrode layer 114A are also sequentially disposed corresponding to the portion of the auxiliary electrode layer 112 in the trench 15 structure.
In the present embodiment, the second electrode 12 is a ring-shaped structure, and is disposed on the upper surface of the first substrate SB1 and is disposed to overlap the slot 15. As shown in FIG. 1A, the ring structure of the second electrode 12 overlaps the auxiliary electrode 112 in the slot 15, and the outer side of the ring overlaps a portion of the first electrode layer 111. The liquid crystal layer LC is disposed between the first electrode 11 and the second electrode 12, and the voltage of the first electrode 11 and the second electrode 12 controls the turning of liquid crystal molecules in the liquid crystal layer LC, thereby changing the dielectric coefficient of the liquid crystal material. An equivalent inductance and capacitance resonance circuit (LC resonance) is formed between the metal electrode and the liquid crystal material of the planar antenna, and the resonance frequency of the circuit is related to the equivalent inductance and the equivalent capacitance. As the dielectric constant of the liquid crystal material changes, the equivalent capacitance in the equivalent circuit changes, and thus the resonant frequency varies. In other words, the metal electrodes provide different control voltages to the liquid crystal molecules, so that the planar antenna can generate different resonant frequency responses to form an adjustable planar antenna.
The electrodes for controlling the liquid crystal driving signal of the liquid crystal layer LC are respectively connected to the rectangular structure of the auxiliary electrode layer 112 in the first electrode 11 and the ring structure of the second electrode 12, the rectangular structure is the Vcom end of the liquid crystal driving signal, the ring structure is the Vdata end, and the equivalent capacitance value is changed by the voltage of the liquid crystal driving signal. On the other hand, the current of the rf signal is related to the equivalent inductance. If the first electrode 11 is only provided with the first electrode layer 111 and the auxiliary electrode layer 112, since the auxiliary electrode layer 112 is electrically connected to the first electrode layer 111, the rf-fed circuit and the liquid crystal driving circuit share a ground terminal, and the Vcom terminal charge of the liquid crystal driving circuit is interfered by the ground terminal, and the charge cannot be accumulated enough to make the voltage difference between Vdata and Vcom reach a predetermined value. In the embodiment, the insulating layer 113 and the second electrode layer 114 are disposed on the first electrode layer 111, so that the second electrode layer 114 is used as the ground of the liquid crystal control circuit, and the first electrode layer 111 is used as the ground of the rf signal circuit, that is, the Vcom end of the low-frequency liquid crystal driving signal can be considered as an electrical isolation from the ground of the high-frequency rf signal by the relationship of the insulating layer 113 through the plate capacitor structure formed by the first electrode layer 111, the insulating layer 113 and the second electrode layer 114. The isolation capacitor is regarded as short-circuit conduction under radio frequency signals, and the operation of the planar antenna is not influenced.
The isolation capacitor forms a loop of a high-pass filter with a cut-off frequency (cut-off frequency) related to the capacitance, which in turn is related to the thickness, dielectric constant and effective area of the plate capacitor structure, along with the characteristic impedance (e.g., 50 Ω) of the rf feed. In the present embodiment, the thickness of the first electrode layer 111 may be 7 to 30 times the thickness of the second electrode layer 114.
As shown in fig. 1B, the tunable planar antenna 1 may include a second substrate SB2, the second substrate SB2 may serve as a structure for sealing the liquid crystal layer LC, and the second electrode 12 may be disposed on the second substrate SB2, such that the first electrode 11, the liquid crystal layer LC, and the second electrode 12 are disposed between the first substrate SB1 and the second substrate SB 2. In the present embodiment, the signal feeding line SL and the first electrode 11 are formed on the upper surface and the lower surface of the first substrate SB1 by a double-sided process. In another embodiment, the tunable planar antenna may further include a third substrate SB3, as shown in fig. 1C, the third substrate SB3 may be disposed on the other side of the signal feeding line SL relative to the first substrate SB1, such that the signal feeding line SL is located between the first substrate SB1 and the third substrate SB 3. In the above embodiments, the first substrate SB1, the second substrate SB2, and the third substrate SB3 may be glass substrates.
Fig. 2A and fig. 2B are schematic diagrams of a tunable planar antenna with self-filtering function according to another embodiment of the present invention, where fig. 2A is a schematic plan view of the tunable planar antenna with self-filtering function, and fig. 2B is a schematic cross-sectional view of a dotted line B-B' in fig. 2A. As shown, the tunable planar antenna 2 includes a first substrate SB1, a second substrate SB2, a third substrate SB3, a signal feed line SL, a first electrode 21, a second electrode 22, and a liquid crystal layer LC. The signal feed line SL is disposed between the first substrate SB1 and the third substrate SB3, and the first electrode 21, the liquid crystal layer LC, and the second electrode 22 are disposed between the first substrate SB1 and the second substrate SB 2. The first electrode 21, the liquid crystal layer LC, and the second electrode 22 are sequentially disposed on the upper surface of the first substrate SB1, and the first electrode 21 overlaps the signal feed line SL. In the present embodiment, the tunable planar antenna 2 includes the first substrate SB1, the second substrate SB2, and the third substrate SB3, but the invention is not limited thereto, the signal feed line SL and the first electrode 21 can be disposed on two side surfaces of the first substrate SB1 by a double-sided process, and the tunable planar antenna 2 only includes the first substrate SB1 and the second substrate SB 2.
The first electrode 21 includes a first electrode layer 211, an auxiliary electrode layer 212, an insulating layer 213 and a second electrode layer 214, the first electrode layer 211 has a hollow slot 25 structure, the auxiliary electrode layer 212 has a rectangular structure and is disposed in the slot 25 and electrically connected to the first electrode layer 211 through a connection line 25L. The first electrode layer 211 and the auxiliary electrode layer 212 belong to the same conductive electrode layer, and insulating layers 213 and 213A and second electrode layers 214 and 214A are sequentially disposed on the first electrode layer 211 and the auxiliary electrode layer 212, respectively. The second electrode 22 is a ring-shaped structure and is disposed to overlap the slot 25. The first electrode 21 is similar to the previous embodiment, and the first electrode layer 211, the insulating layer 213 and the second electrode layer 214 form a plate capacitor to form an isolation capacitor between the liquid crystal driving circuit and the rf circuit. The difference from the previous embodiment is the installation area of the second electrode layer 214. In fig. 1A and 1B, the second electrode layer 114 and the first electrode layer 111 have the same area, and in the embodiment, the area of the second electrode layer 214 is smaller than that of the first electrode layer 211, thereby saving the material cost required for manufacturing the second electrode layer 214. However, compared to the overlapping area formed by the projection of the second electrode 22 on the first electrode layer 211 and the auxiliary electrode layer 212, the area of the second electrode layer 214 should be larger than 0.1 times of the projection area to maintain the operation effect.
Please refer to fig. 3A and 3B, which are schematic diagrams of a tunable planar antenna with self-filtering function according to another embodiment of the present invention, wherein fig. 3A is a schematic plan view of the tunable planar antenna with self-filtering function, and fig. 3B is a schematic cross-sectional view along the dashed line C-C' in fig. 3A. As shown, the tunable planar antenna 3 includes a first substrate SB1, a second substrate SB2, a third substrate SB3, a signal feed line SL, a first electrode 31, a second electrode 32, and a liquid crystal layer LC. The signal feed line SL is disposed between the first substrate SB1 and the third substrate SB3, and the first electrode 31, the liquid crystal layer LC, and the second electrode 32 are disposed between the first substrate SB1 and the second substrate SB 2. The first electrode 31, the liquid crystal layer LC, and the second electrode 32 are sequentially disposed on the upper surface of the first substrate SB1, and the first electrode 31 overlaps the signal feed line SL. The first substrate SB1, the second substrate SB2, and the third substrate SB3 are arranged in a similar manner to the foregoing embodiment, and the description of the same parts will not be repeated.
The first electrode 31 includes a first electrode layer 311, an auxiliary electrode layer 312, an insulating layer 313 and a second electrode layer 314, the first electrode layer 311 has a hollow slot 35 structure, the auxiliary electrode layer 312 is disposed in the slot 35 and electrically connected to the first electrode layer 311 through a connection line 35L. The first electrode layer 311 and the auxiliary electrode layer 312 belong to the same conductive electrode layer, and insulating layers 313 and 313A and second electrode layers 314 and 314A are sequentially disposed on the first electrode layer 311 and the auxiliary electrode layer 312, respectively. In the present embodiment, the auxiliary electrode layer 312 has a ring structure and the second electrode 22 has a rectangular structure, and the rectangular structure of the second electrode 22 partially overlaps the ring structure of the auxiliary electrode layer 312.
The first electrode layer 311, the insulating layer 313 and the second electrode layer 314 form a plate capacitor to form an isolation capacitor between the liquid crystal driving circuit and the rf circuit, so as to avoid the problem that the Vcom end charge of the liquid crystal driving circuit is interfered by the ground end, and the generated charge cannot be accumulated to make the voltage difference between Vdata and Vcom reach a predetermined value.
Fig. 4A and 4B are schematic views of a tunable planar antenna with self-filtering function according to still another embodiment of the present invention, where fig. 4A is a schematic plan view of the tunable planar antenna with self-filtering function, and fig. 4B is a schematic cross-sectional view along the dashed line D-D' in fig. 4A. As shown in the figure, the tunable planar antenna 4 includes a first substrate SB1, a second substrate SB2, a third substrate SB3, a signal feed line SL, a first electrode 41, a second electrode 42, and a liquid crystal layer LC, wherein the signal feed line SL is disposed between the first substrate SB1 and the third substrate SB3, the first electrode 41 and the second electrode 42 are disposed between the first substrate SB1 and the second substrate SB2, and the liquid crystal layer LC is disposed between the first electrode 41 and the second electrode 42. Unlike the previous embodiments, the second electrode 42, the liquid crystal layer LC and the first electrode 41 of the present embodiment are sequentially disposed on the upper surface of the first substrate SB1, so that the signal feeding circuit formed by the signal feeding line SL and the first electrode 41 is located at the outer side, and the liquid crystal control circuit formed by the first electrode 41 and the second electrode 42 is located at the inner side. In the present embodiment, the tunable planar antenna 4 includes the first substrate SB1, the second substrate SB2, and the third substrate SB3, but the invention is not limited thereto, the signal feed line SL and the second electrode 42 can be disposed on two side surfaces of the first substrate SB1 by a double-sided process, and the tunable planar antenna 4 only includes the first substrate SB1 and the second substrate SB 2.
In the present embodiment, the first electrode 41 is also overlapped with the signal feeding line SL and includes a first electrode layer 411, an auxiliary electrode layer 412, an insulating layer 413 and a second electrode layer 414, the first electrode layer 411 and the auxiliary electrode layer 412 can be disposed on the lower surface of the second substrate SB2, wherein the first electrode layer 411 has a hollow slot 45 structure, a receiving space can be formed in the first electrode layer 411, and the auxiliary electrode layer 412 is disposed in the receiving space formed by the slot 45. The auxiliary electrode layer 412 has a rectangular structure, and the side of the rectangle is separated from the first electrode layer 411 and is electrically connected to the first electrode layer 411 only through the connection line 45L. The first electrode layer 411 and the auxiliary electrode layer 412 belong to the same conductive electrode layer and can be manufactured in the same process. In addition, an insulating layer 413 and a second electrode layer 414 are sequentially disposed on the first electrode layer 411, and an insulating layer 413A and a second electrode layer 414A are also sequentially disposed corresponding to the portion of the auxiliary electrode layer 412 in the trench 45 structure. The second electrode 42 is a ring-shaped structure, and is disposed on the upper surface of the first substrate SB1 and is disposed to overlap the slot 45. The first electrode 41 and the second electrode 42 control the liquid crystal molecules in the liquid crystal layer LC to turn, so as to change the dielectric constant of the material and thus change the resonant frequency of the planar antenna, thereby achieving an adjustable planar antenna.
The first electrode layer 411, the insulating layer 413 and the second electrode layer 414 in the first electrode 41 can form a plate capacitor as an isolation capacitor between the liquid crystal driving circuit and the rf circuit, so as to avoid the problem that the Vcom end charge of the liquid crystal driving circuit is interfered by the ground end, and the charge cannot be accumulated enough to make the voltage difference between Vdata and Vcom reach the predetermined value. The isolation capacitor and the characteristic impedance fed by the radio frequency form a loop of a high-pass filter, the cut-off frequency of the filter is related to the resistance value and the capacitance value, and the capacitance value is related to the thickness, the dielectric constant and the effective area in the plate capacitor structure. In the present embodiment, the thickness of the first electrode layer 411 may be 7 to 30 times the thickness of the second electrode layer 414.
Please refer to fig. 5A and 5B, which are schematic diagrams of a tunable planar antenna with self-filtering function according to still another embodiment of the present invention, wherein fig. 5A is a schematic plan view of the tunable planar antenna with self-filtering function, and fig. 5B is a schematic cross-sectional view along the dashed line E-E' in fig. 5A. As shown in the figure, the tunable planar antenna 5 includes a first substrate SB1, a second substrate SB2, a third substrate SB3, a signal feed line SL, a first electrode 51, a second electrode 52, and a liquid crystal layer LC, wherein the signal feed line SL is disposed between the first substrate SB1 and the third substrate SB3, the first electrode 51 and the second electrode 52 are disposed between the first substrate SB1 and the second substrate SB2, and the liquid crystal layer LC is disposed between the first electrode 51 and the second electrode 52. The second electrode 52, the liquid crystal layer LC and the first electrode 51 are sequentially disposed on the upper surface of the first substrate SB1, so that a signal feeding circuit formed by the signal feeding line SL and the first electrode 51 is located at the outer side, and a liquid crystal control circuit formed by the first electrode 51 and the second electrode 52 is located at the inner side. The first substrate SB1, the second substrate SB2, and the third substrate SB3 are arranged in a similar manner to the foregoing embodiment, and the description of the same parts will not be repeated.
The first electrode 51 is overlapped with the signal feed-in line SL and includes a first electrode layer 511, an auxiliary electrode layer 512, an insulating layer 513 and a second electrode layer 514, the first electrode layer 511 and the auxiliary electrode layer 512 are disposed on the lower surface of the second substrate SB2, wherein the first electrode layer 511 has a hollow slot 55 structure, a receiving space can be formed in the first electrode layer 511, and the auxiliary electrode layer 512 is disposed in the receiving space formed by the slot 55. The auxiliary electrode layer 512 has a rectangular structure, and the side of the rectangle is separated from the first electrode layer 511, and is electrically connected to the first electrode layer 511 only through the connection line 55L. The first electrode layer 511 and the auxiliary electrode layer 512 belong to the same conductive electrode layer and can be manufactured in the same process. In addition, an insulating layer 513 and a second electrode layer 514 are sequentially disposed on the first electrode layer 511, and an insulating layer 513A and a second electrode layer 514A are sequentially disposed corresponding to the auxiliary electrode layer 512 in the trench 55 structure. The second electrode 52 is a ring-shaped structure, and is disposed on the upper surface of the first substrate SB1 and is disposed to overlap the slot 55. Unlike the embodiment shown in fig. 4A and 4B, the area of the second electrode layer 514 of the present embodiment is smaller than the area of the first electrode layer 511, so as to save the material cost for manufacturing the second electrode layer 514. However, compared to the overlapping area formed by the projection of the second electrode 52 on the first electrode layer 511 and the auxiliary electrode layer 512, the area of the second electrode layer 514 should be larger than 0.1 times of the projection area to maintain the operation effect.
The first electrode layer 511, the insulating layer 513 and the second electrode layer 514 of the first electrode 51 can form a plate capacitor as an isolation capacitor between the liquid crystal driving circuit and the rf circuit, so as to avoid the problem that the Vcom end charge of the liquid crystal driving circuit is interfered by the ground end, and the charge cannot be accumulated enough to make the voltage difference between Vdata and Vcom reach the predetermined value.
Fig. 6A and 6B are schematic diagrams of a tunable planar antenna with self-filtering function according to still another embodiment of the present invention, where fig. 6A is a schematic plan view of the tunable planar antenna with self-filtering function, and fig. 6B is a schematic cross-sectional view along a dotted line F-F' in fig. 6A. As shown in the figure, the tunable planar antenna 6 includes a first substrate SB1, a second substrate SB2, a third substrate SB3, a signal feed line SL, a first electrode 61, a second electrode 62, and a liquid crystal layer LC, wherein the signal feed line SL is disposed between the first substrate SB1 and the third substrate SB3, the first electrode 61 and the second electrode 62 are disposed between the first substrate SB1 and the second substrate SB2, and the liquid crystal layer LC is disposed between the first electrode 61 and the second electrode 62. The second electrode 62, the liquid crystal layer LC and the first electrode 61 are sequentially disposed on the upper surface of the first substrate SB1, so that the signal feeding circuit formed by the signal feeding line SL and the first electrode 61 is located at the outer side, and the liquid crystal control circuit formed by the first electrode 61 and the second electrode 62 is located at the inner side. The first substrate SB1, the second substrate SB2, and the third substrate SB3 are arranged in a similar manner to the foregoing embodiment, and the description of the same parts will not be repeated.
The first electrode 61 overlaps the signal feeding line SL and includes a first electrode layer 611, an auxiliary electrode layer 612, an insulating layer 613, and a second electrode layer 614, the first electrode layer 611 and the auxiliary electrode layer 612 are disposed on the lower surface of the second substrate SB2, wherein the first electrode layer 611 has a hollow slot 65 structure, a receiving space can be formed in the first electrode layer 611, and the auxiliary electrode layer 612 is disposed in the receiving space formed by the slot 65. In the present embodiment, the auxiliary electrode layer 612 is a ring structure and is electrically connected to the first electrode layer 611 through the connection line 65L. The first electrode layer 611 and the auxiliary electrode layer 612 belong to the same conductive electrode layer and can be manufactured in the same process. In addition, an insulating layer 613 and a second electrode layer 614 are sequentially disposed on the first electrode layer 611, and an insulating layer 613A and a second electrode layer 614A are also sequentially disposed corresponding to the auxiliary electrode layer 612 portion in the trench 65 structure. The second electrode 62 is a rectangular structure, and is disposed on the upper surface of the first substrate SB1 and is disposed to overlap the slot 65.
The first electrode layer 611, the insulating layer 613 and the second electrode layer 614 in the first electrode 61 can form a plate capacitor as an isolation capacitor between the liquid crystal driving circuit and the rf circuit, so as to avoid the problem that the Vcom end charge of the liquid crystal driving circuit is interfered by the ground end, and the charge cannot be accumulated enough to make the voltage difference between Vdata and Vcom reach the predetermined value.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (13)
1. An adjustable planar antenna with filtering function, comprising:
a first substrate including a first surface and a second surface opposite to the first surface;
a signal feed-in line arranged on the first surface;
a first electrode disposed on the second surface and overlapping the signal feed-in line, comprising:
a first electrode layer having a slot;
an auxiliary electrode layer disposed in the slot, the auxiliary electrode layer being electrically connected to the first electrode layer, and the auxiliary electrode layer and the first electrode layer belonging to the same conductive electrode layer;
an insulating layer disposed on the first electrode layer and the auxiliary electrode layer; and
a second electrode layer disposed on the insulating layer;
a second electrode disposed on the second surface and overlapping the slot, the second electrode facing the second electrode layer; and
a liquid crystal layer disposed between the first electrode and the second electrode.
2. The tunable planar antenna with filtering function of claim 1, wherein the first electrode, the liquid crystal layer and the second electrode are sequentially stacked on the second surface.
3. The tunable planar antenna with self-filtering function according to claim 2, wherein the second electrode is annular and partially overlaps the auxiliary electrode layer.
4. The tunable planar antenna with self-filtering function according to claim 2, wherein the auxiliary electrode layer is annular, and the auxiliary electrode layer partially overlaps the second electrode.
5. The tunable planar antenna with filtering function of claim 1, wherein the second electrode, the liquid crystal layer and the first electrode are sequentially stacked on the second surface.
6. The tunable planar antenna with self-filtering function according to claim 5, wherein the second electrode is annular and partially overlaps the auxiliary electrode layer.
7. The tunable planar antenna with self-filtering function according to claim 5, wherein the auxiliary electrode layer is annular, and the auxiliary electrode layer partially overlaps the second electrode.
8. The tunable planar antenna with filtering function of claim 1, wherein an overlapping area is formed between the second electrode and the first electrode layer and between the second electrode and the auxiliary electrode layer, and the area of the second electrode layer is greater than 0.1 times the overlapping area.
9. The tunable planar antenna with filtering function of claim 1, wherein the area of the second electrode layer is the same as the area of the first electrode layer.
10. The tunable planar antenna with self-filtering function according to claim 1, wherein the thickness of the first electrode layer is 7-30 times the thickness of the second electrode layer.
11. The tunable planar antenna with filtering function of claim 1, further comprising a second substrate, wherein the first electrode, the liquid crystal layer and the second electrode are disposed between the first substrate and the second substrate.
12. The tunable planar antenna with self-filtering function of claim 11, further comprising a third substrate, wherein the signal feed line is disposed between the first substrate and the third substrate.
13. The tunable planar antenna with filtering function of claim 12, wherein the first substrate, the second substrate and the third substrate are glass substrates.
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| TW109118637A TWI728826B (en) | 2020-06-03 | 2020-06-03 | Planar tunable antenna with frequency filtering functionality |
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| TWI728826B (en) | 2021-05-21 |
| TW202147686A (en) | 2021-12-16 |
| CN112490676B (en) | 2023-05-12 |
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