TWI728826B - Planar tunable antenna with frequency filtering functionality - Google Patents

Abstract

A planar tunable antenna with frequency filtering functionality is disclosed. The planar tunable antenna includes a first substrate, a signal feeding line, a first electrode, a second electrode and a liquid crystal layer. The first substrate includes a first surface and a second surface. The signal feeding line is disposed on the first surface and the first electrode is disposed on the second substrate. The first electrode includes a first electrode layer, an auxiliary electrode layer, an isolation layer and a second electrode layer. The auxiliary electrode layer is disposed in a groove of the first electrode layer and is electrically connected to the first electrode layer. The isolation layer is disposed on the first electrode layer and the auxiliary layer. The second electrode layer is disposed on the isolation layer. The second electrode is overlapped with the groove. The liquid crystal layer is disposed between the first electrode and the second electrode.

Description

Adjustable planar antenna with filter function

The present invention relates to an adjustable planar antenna with a filtering function, in particular to an adjustable planar antenna including an isolation capacitor structure to prevent the liquid crystal drive circuit from being affected by the radio frequency signal circuit.

The planar dipole antenna adopts the electronic non-mechanical rotating beam scanning method, which has the advantages of high stability, the beam gain increases with the increase of the number of antenna elements, and the advantages of small size and high integration. It can be applied to the millimeter wave radar of automatic driving assistance system (ADAS), the automatic navigation of drones out of sight (BVLOS) and the remote monitoring of physiological characteristics (Vital sign), and further provide remote emotional monitoring, wireless power transfer (wireless power transfer) ) And fifth-generation mobile communications and other fields,

The antenna unit of the planar dipole antenna mainly uses materials with modulated permittivity (permittivity) filled around the electrodes, such as liquid crystal, and uses voltage to control the turning of liquid crystal molecules, changing the permittivity of the liquid crystal material, thereby changing the resonance The capacitance value in the circuit makes the resonance frequency different. In other words, given different control voltages to the liquid crystal, the antenna unit can generate different resonance frequency responses, adjust the appropriate antenna operating frequency, control the electromagnetic wave radiation intensity, and arrange the antenna units in an array by controlling the switch of each antenna unit , To achieve a specific angle of beam scanning function.

In the present invention, by designing an adjustable planar antenna with a filtering function, it improves the lack of the prior art, thereby enhancing the industrial application and utilization.

In view of the above-mentioned conventional technical problems, the purpose of the present invention is to provide an adjustable planar antenna with a filter function, which has an isolation capacitor structure to solve the problem of interference between the liquid crystal drive circuit and the radio frequency circuit.

According to the above objective, an embodiment of the present invention provides an adjustable planar antenna with a 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 includes a first surface and a second surface opposite to the first surface, and the signal feed line is arranged on the first surface. The first electrode is arranged on the second surface and overlaps the signal feed-in line, and includes a first electrode layer, an auxiliary electrode layer, an insulating layer, and a second electrode layer. The first electrode layer has a slot hole, the auxiliary electrode layer is disposed in the slot hole, the auxiliary electrode layer is electrically connected to 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 disposed on the second surface and overlaps the slot hole, and the second electrode surface faces the second electrode layer. The liquid crystal layer is disposed between the first electrode and the second electrode.

In an embodiment of the present 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 have a ring shape, and the second electrode may partially overlap the auxiliary electrode layer. In another embodiment, the auxiliary electrode layer may have a ring shape, and the auxiliary electrode layer partially overlaps the second electrode.

In an embodiment of the present 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 have a ring shape, and the second electrode may partially overlap the auxiliary electrode layer. In another embodiment, the auxiliary electrode layer may have a ring shape, and the auxiliary electrode layer partially overlaps the second electrode.

In the embodiment of the present invention, there is an overlap area between the second electrode and the first electrode layer and the auxiliary electrode layer, and the area of the second electrode layer may be greater than 0.1 times the overlap 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 7-30 times the thickness of the second electrode layer.

In an embodiment of the present invention, the adjustable planar antenna with a 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 present invention, the adjustable planar antenna with a 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 present invention, the first substrate, the second substrate, and the third substrate may be glass substrates.

In summary, according to the adjustable planar antenna with filtering function disclosed in the embodiment of the present invention, a first electrode layer, an insulating layer, and a second electrode layer can be provided on the first electrode to form a planar capacitor structure. An isolation capacitor is formed between the liquid crystal drive circuit and the signal feeding circuit. Using the adjustable planar antenna with the above structure can effectively shorten the transient time of the square wave and reduce the required charging time.

In order to understand the technical features, content and advantages of the present invention and the effects that can be achieved, the present invention is described in detail with the accompanying drawings and in the form of embodiment expressions as follows, and the figures used therein are only For the purpose of illustration and supplementary description, it is not necessarily the true scale and precise configuration after the implementation of the present invention. Therefore, the scale and configuration relationship of the attached drawings should not be interpreted, and the scope of rights of the present invention in actual implementation should not be interpreted. Narrate.

In the drawings, for the sake of clarity, the thickness or width of layers, films, panels, regions, light guides, etc. are exaggerated. Throughout the specification, the same reference numerals denote the same elements. It should 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 Intermediate elements can also be present. Conversely, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements. As used herein, "connection" can refer to a physical and/or electrical connection. Furthermore, "electrical connection" or "coupling" can mean that there are other elements between the two elements. In addition, it should be understood that although the terms “first”, “second”, and “third” may be used herein to describe various elements, components, regions, layers and/or parts, they are used to refer to an element, component , Region, layer and/or part are distinguished from another element, component, region, layer and/or part. Therefore, it is only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or its sequence relationship.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have meanings commonly understood by ordinary knowledge in the technical field to which the present invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the context of related technologies and the present invention, and will not be interpreted as idealized or excessive The formal meaning, unless explicitly defined as such in this article.

Please refer to Figs. 1A to 1C at the same time, which are schematic diagrams of the adjustable planar antenna with filtering function according to the embodiment of the present invention. Fig. 1A is a schematic plan view of the adjustable planar antenna with filtering function, and Fig. 1B It is a schematic cross-sectional view along the dashed line AA' in Figure 1A, and Figure 1C is a schematic cross-sectional view along the dashed line AA' in Figure 1A in another embodiment. As shown in the figure, the adjustable 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. The signal feed line SL is arranged on the lower surface of the first substrate SB1. The first electrode 11 is disposed on the upper surface of the first substrate SB1, and the first electrode 11 overlaps with the signal feeding 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. The first electrode layer 111 is provided with a hollow slot 15 structure formed in the first electrode layer 111 to accommodate The auxiliary electrode layer 112 is arranged in the accommodating space formed by the slot 15. The auxiliary electrode layer 112 may have a rectangular structure, the sides of the rectangle are separated from the first electrode layer 111, and are only electrically connected to the first electrode layer 111 through the connection line 15L. The first electrode layer 111 and the auxiliary electrode layer 112 belong to the same conductive electrode layer, and can be disposed on the upper surface of the first substrate SB1 in the same manufacturing process. In addition, an insulating layer 113 and a second electrode layer 114 are sequentially arranged on the first electrode layer 111, and corresponding to the auxiliary electrode layer 112 in the slot 15 structure, an insulating layer 113A and a second electrode layer 114A are also arranged in sequence.

In this embodiment, the second electrode 12 has a ring structure, which is arranged on the upper surface of the first substrate SB1 and the arrangement position overlaps 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 part 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 rotation of the liquid crystal molecules in the liquid crystal layer LC is controlled by the voltage of the first electrode 11 and the second electrode 12, thereby changing the dielectric constant of the liquid crystal material. An LC resonance circuit of equivalent inductance and capacitance is formed between the metal electrode of the planar antenna and the liquid crystal material. 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 value in the equivalent circuit will change accordingly, and therefore the resonance frequency will be different. In other words, by giving different control voltages to the liquid crystal molecules by the metal electrodes, the planar antenna can generate different resonance frequency responses, forming an adjustable planar antenna.

The electrodes 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, and the ring structure is At the Vdata terminal, the equivalent capacitance value is changed by the voltage of the liquid crystal drive signal. On the other hand, the current of the RF signal is related to the equivalent inductance. If the first electrode 11 is provided with only the first electrode layer 111 and the auxiliary electrode layer 112, since the auxiliary electrode layer 112 and the first electrode layer 111 are electrically connected, the radio frequency feed circuit and the liquid crystal drive circuit share the ground terminal. The charge on the Vcom terminal of the liquid crystal driving circuit is interfered by the ground terminal, and the charge cannot be accumulated enough to allow the voltage difference between Vdata and Vcom to reach a predetermined value. In this embodiment, by disposing the insulating layer 113 and the second electrode layer 114 on the first electrode layer 111, the second electrode layer 114 is used as the ground terminal of the liquid crystal control circuit, and the first electrode layer 111 is used as the radio frequency signal circuit. The grounding terminal of the first electrode layer 111, the insulating layer 113 and the second electrode layer 114 constitute the flat capacitor structure, so that the Vcom terminal of the low-frequency liquid crystal driving signal can be compared with the high-frequency The ground terminal of the radio frequency signal is regarded as electrical isolation. The isolation capacitor described here is regarded as a short-circuit conduction under the radio frequency signal, and does not affect the operation of the planar antenna.

The aforementioned isolation capacitor will form a high-pass filter loop with the characteristic impedance of the radio frequency feed, for example 50Ω. The cut-off frequency of the filter is related to the resistance value and the capacitance value, and the capacitance value It is also related to the thickness, dielectric constant and effective area of the flat capacitor structure. In this embodiment, the thickness of the first electrode layer 111 may be 7-30 times the thickness of the second electrode layer 114.

As shown in Figure 1B, the adjustable planar antenna 1 can include a second substrate SB2, which can be used as a structure for sealing the liquid crystal layer LC, and the second electrode 12 can be disposed on the second substrate SB2, so that The first electrode 11, the liquid crystal layer LC and the second electrode 12 are located between the first substrate SB1 and the second substrate SB2. In this embodiment, the signal feed line SL and the first electrode 11 are respectively formed on the upper surface and the lower surface of the first substrate through a double-sided manufacturing process. In another embodiment, the adjustable planar antenna may further include a third substrate SB3. As shown in Figure 1C, the third substrate SB3 may be disposed on the other side of the signal feed line SL relative to the first substrate SB1, so that the signal The feed line SL is located between the first substrate SB1 and the third substrate SB3. In the above embodiment, the first substrate SB1, the second substrate SB2, and the third substrate SB3 may be glass substrates.

Please refer to Fig. 2A and Fig. 2B at the same time, which are schematic diagrams of an adjustable planar antenna with filtering function according to another embodiment of the present invention. Fig. 2A is a schematic plan view of the adjustable planar antenna with filtering function. Figure 2B is a schematic cross-sectional view taken along the broken line B-B' in Figure 2A. As shown in the figure, the adjustable 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-in 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 located between the first substrate SB1 and the second substrate SB2. The first electrode 21, the liquid crystal layer LC and the second electrode 22 are sequentially arranged on the upper surface of the first substrate SB1, and the first electrode 21 overlaps the signal feed-in line SL. In this embodiment, the adjustable planar antenna 2 includes a first substrate SB1, a second substrate SB2, and a third substrate SB3, but the present disclosure is not limited to this. The signal feed line SL and the first electrode 21 can be provided by a double-sided manufacturing process. On both sides of the first substrate SB1, the adjustable planar antenna 2 only includes the first substrate SB1 and the second substrate SB2 at this time.

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 is provided with a hollow slot 25 structure, and the auxiliary electrode layer 212 has a rectangular structure. The slot 25 is electrically connected to the first electrode layer 211 through the connection line 25L. The first electrode layer 211 and the auxiliary electrode layer 212 belong to the same conductive electrode layer. On the first electrode layer 211 and the auxiliary electrode layer 212, insulating layers 213, 213A and second electrode layers 214, 214A are respectively provided in sequence. The second electrode 22 has a ring structure, and its arrangement position overlaps the slot 25. The first electrode 21 is similar to the previous embodiment. The first electrode layer 211, the insulating layer 213, and the second electrode layer 214 constitute a plate capacitor to form an isolation capacitor between the liquid crystal driving circuit and the radio frequency circuit. The difference from the foregoing embodiment lies in the area of the second electrode layer 214. In Figures 1A and 1B, the second electrode layer 114 and the first electrode layer 111 have the same area. In this embodiment, the area of the second electrode layer 214 is smaller than the area of the first electrode layer 111, thereby saving manufacturing The material cost required for the second electrode layer 114. 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 114 should be greater than 0.1 times the projected area to maintain its operational effect.

Please refer to FIGS. 3A and 3B at the same time, which are schematic diagrams of an adjustable planar antenna with self-filtering function according to another embodiment of the present invention. Figure 3A is a schematic plan view of the adjustable planar antenna with self-filtering function. Figure 3B is a schematic cross-sectional view taken along the dashed line C-C' in Figure 3A. As shown in the figure, the adjustable 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-in 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 located between the first substrate SB1 and the second substrate SB2. The first electrode 31, the liquid crystal layer LC, and the second electrode 32 are sequentially arranged on the upper surface of the first substrate SB1, and the first electrode 31 overlaps the signal feed-in line SL. The arrangement of the first substrate SB1, the second substrate SB2, and the third substrate SB3 is similar to the foregoing embodiment, and the same parts are not described again.

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 is provided with a hollow slot 35 structure, and the auxiliary electrode layer 312 is provided in the slot 35. , Is electrically connected to the first electrode layer 311 through the connection line 35L. The first electrode layer 311 and the auxiliary electrode layer 312 belong to the same conductive electrode layer, and the first electrode layer 311 and the auxiliary electrode layer 312 are respectively provided with insulating layers 313, 313A and second electrode layers 314, 314A in sequence. In this 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 drive circuit and the radio frequency circuit to prevent the Vcom terminal charge of the liquid crystal drive circuit from being interfered by the ground terminal, and the generated charge cannot be accumulated enough To the problem of making the voltage difference between Vdata and Vcom reach a predetermined value.

Please refer to Fig. 4A and Fig. 4B at the same time, which are schematic diagrams of a tunable planar antenna with filtering function according to another embodiment of the present invention. Fig. 4A is a schematic plan view of the tunable planar antenna with filtering function. Figure 4B is a schematic cross-sectional view taken along the dashed line D-D' in Figure 4A. As shown in the figure, the adjustable 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, and the signal feed line SL is provided Between the first substrate SB1 and the third substrate, the first electrode 41 and the second electrode 42 are provided between the first substrate SB1 and the second substrate, and the liquid crystal layer LC is provided between the first electrode 41 and the second electrode 42 . Different from the previous embodiment, the second electrode 42, the liquid crystal layer LC and the first electrode 41 of this embodiment are sequentially arranged on the upper surface of the first substrate SB1, so the signal feed line SL and the first electrode 41 form The signal feeding circuit of is located on the outer side, and the liquid crystal control circuit formed by the first electrode 41 and the second electrode 42 is located on the inner side. In this embodiment, the adjustable planar antenna 4 includes a first substrate SB1, a second substrate SB2, and a third substrate SB3, but the present disclosure is not limited to this. The signal feed line SL and the second electrode 42 can be provided by a double-sided manufacturing process. On both sides of the first substrate SB1, the adjustable planar antenna 4 only includes the first substrate SB1 and the second substrate SB2 at this time.

In this embodiment, the first electrode 41 also overlaps the signal feed 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 It can be disposed on the lower surface of the second substrate SB2, where the first electrode layer 411 has a hollow slot 45 structure, and can form an accommodation space in the first electrode layer 411, and the auxiliary electrode layer 412 is formed in the slot 45 In the housing space. The auxiliary electrode layer 412 has a rectangular structure, and the sides of the rectangle are separated from the first electrode layer 411, and are only electrically connected to the first electrode layer 411 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 made in the same manufacturing process. In addition, an insulating layer 413 and a second electrode layer 414 are sequentially disposed on the first electrode layer 411, and corresponding to the auxiliary electrode layer 412 part of the slot 45 structure, the insulating layer 413A and the second electrode layer 414A are also sequentially disposed. The second electrode 42 has a ring structure, which is disposed on the upper surface of the first substrate SB1 and the disposed position overlaps the slot 45. The rotation of the liquid crystal molecules in the liquid crystal layer LC is controlled by the first electrode 41 and the second electrode 42, thereby changing the dielectric coefficient of the material, and therefore the resonance frequency of the planar antenna, to achieve an adjustable planar antenna.

The first electrode layer 411, the insulating layer 413, and the second electrode layer 414 of the first electrode 41 can form a plate capacitor, which acts as an isolation capacitor between the liquid crystal drive circuit and the radio frequency circuit to prevent the Vcom terminal charge of the liquid crystal drive circuit from being grounded. Interference, causing the problem that the charge cannot be accumulated enough to allow the voltage difference between Vdata and Vcom to reach a predetermined value. The isolation capacitor will form a loop of the high-pass filter with the characteristic impedance of the radio frequency feed. The cut-off frequency of this filter is related to the resistance value and the capacitance value, and the capacitance value is related to the thickness, dielectric constant and effective area of the plate capacitor structure. . In this embodiment, the thickness of the first electrode layer 411 may be 7-30 times the thickness of the second electrode layer 414.

Please refer to Fig. 5A and Fig. 5B at the same time, which are schematic diagrams of a tunable planar antenna with filtering function according to another embodiment of the present invention. Fig. 5A is a schematic plan view of the tunable planar antenna with filtering function. Figure 5B is a schematic cross-sectional view taken along the dashed line E-E' in Figure 5A. As shown in the figure, the adjustable 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, and the signal feed line SL is provided Between the first substrate SB1 and the third substrate SB3, the first electrode 51 and the second electrode 52 are provided between the first substrate SB1 and the second substrate SB2, and the liquid crystal layer LC is provided on the first electrode 51 and the second electrode 52 between. The second electrode 52, the liquid crystal layer LC, and the first electrode 51 are sequentially arranged on the upper surface of the first substrate SB1, so the signal feed circuit formed by the signal feed line SL and the first electrode 51 is located on the outside, and the first electrode 51 The liquid crystal control circuit formed with the second electrode 52 is located inside. The arrangement of the first substrate SB1, the second substrate SB2, and the third substrate SB3 is similar to the foregoing embodiment, and the same parts are not described again.

The first electrode 51 overlaps the signal feed 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 are disposed on the second substrate SB2. On the lower surface, the first electrode layer 511 has a hollow slot 55 structure, and an accommodation space can be formed in the first electrode layer 511, and the auxiliary electrode layer 512 is disposed in the accommodation space formed by the slot 55. The auxiliary electrode layer 512 has a rectangular structure, and the sides of the rectangle are separated from the first electrode layer 511, and are only electrically connected to the first electrode layer 511 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 made in the same manufacturing process. In addition, an insulating layer 513 and a second electrode layer 514 are sequentially arranged on the first electrode layer 511, and corresponding to the auxiliary electrode layer 512 in the slot 55 structure, an insulating layer 513A and a second electrode layer 514A are also arranged in sequence. The second electrode 52 has a ring structure, which is disposed on the upper surface of the first substrate SB1 and the disposed position overlaps the slot 55. Different from the embodiment in FIG. 4A and FIG. 4B, the area of the second electrode layer 514 in this embodiment is smaller than the area of the first electrode layer 511, which saves the material cost required 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 greater than 0.1 times the projected area to maintain its operational 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, which acts as an isolation capacitor between the liquid crystal drive circuit and the radio frequency circuit to prevent the Vcom terminal charge of the liquid crystal drive circuit from being grounded. Interference, causing the problem that the charge cannot be accumulated enough to allow the voltage difference between Vdata and Vcom to reach a predetermined value.

Please refer to Fig. 6A and Fig. 6B at the same time, which are schematic diagrams of an adjustable planar antenna with filtering function according to another embodiment of the present invention. Fig. 6A is a schematic plan view of the adjustable planar antenna with filtering function. Figure 6B is a schematic cross-sectional view taken along the dashed line F-F' in Figure 6A. As shown in the figure, the adjustable 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, and the signal feed line SL is provided Between the first substrate SB1 and the third substrate SB3, the first electrode 61 and the second electrode 62 are provided between the first substrate SB1 and the second substrate SB2, and the liquid crystal layer LC is provided on the first electrode 61 and the second electrode 62 between. The second electrode 62, the liquid crystal layer LC, and the first electrode 61 are sequentially arranged on the upper surface of the first substrate SB1, so the signal feed circuit formed by the signal feed line SL and the first electrode 61 is located outside, and the first electrode 61 The liquid crystal control circuit formed with the second electrode 62 is located inside. The arrangement of the first substrate SB1, the second substrate SB2, and the third substrate SB3 is similar to the foregoing embodiment, and the same parts are not described again.

The first electrode 61 overlaps the signal feed-in 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 are disposed on the second substrate SB2. On the lower surface, the first electrode layer 611 has a hollow slot 55 structure, and an accommodating space can be formed in the first electrode layer 611, and the auxiliary electrode layer 612 is disposed in the accommodating space formed by the slot 65. In this embodiment, the auxiliary electrode layer 512 has 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 made in the same manufacturing process. In addition, an insulating layer 613 and a second electrode layer 614 are sequentially arranged on the first electrode layer 611. Corresponding to the auxiliary electrode layer 612 in the slot 65 structure, an insulating layer 613A and a second electrode layer 614A are also arranged in sequence. The second electrode 62 has a rectangular structure, which is disposed on the upper surface of the first substrate SB1 and the disposed position overlaps the slot 65.

The first electrode layer 611, the insulating layer 613, and the second electrode layer 614 of the first electrode 61 can form a plate capacitor, which acts as an isolation capacitor between the liquid crystal drive circuit and the radio frequency circuit to prevent the Vcom terminal charge of the liquid crystal drive circuit from being grounded. Interference, causing the problem that the charge cannot be accumulated enough to allow the voltage difference between Vdata and Vcom to reach a predetermined value.

The above descriptions are merely illustrative and not restrictive. Any equivalent modifications or alterations that do not depart from the spirit and scope of the present invention should be included in the scope of the appended patent application.

1,2,3,4,5,6: Adjustable planar antenna 11, 21, 31, 41, 51, 61: first electrode 12, 22, 32, 42, 52, 62: second electrode 15, 25, 35, 45, 55, 65: slot 15L, 25L, 35L, 45L, 55L, 65L: connection 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, 214, 214A, 314, 314A, 414, 414A, 514, 514A, 614, 614A: second electrode layer LC: liquid crystal layer SB1: The first substrate SB2: Second substrate SB3: Third substrate SL: signal feed-in line

In order to make the technical features, content and advantages of the present invention and its achievable effects more obvious, the present invention is described in detail in the form of embodiments with the accompanying drawings as follows: Figures 1A, 1B, and 1C are schematic diagrams of an adjustable planar antenna with a filtering function according to an embodiment of the present invention. 2A and 2B are schematic diagrams of a tunable planar antenna with filtering function according to another embodiment of the present invention. 3A and 3B are schematic diagrams of a tunable planar antenna with filtering function according to another embodiment of the present invention. 4A and 4B are schematic diagrams of a tunable planar antenna with filtering function according to another embodiment of the present invention. Figures 5A and 5B are schematic diagrams of a tunable planar antenna with filtering function according to yet another embodiment of the present invention. Fig. 6A and Fig. 6B are schematic diagrams of a tunable planar antenna with filtering function according to still another embodiment of the present invention.

1: Adjustable planar antenna

11: The first electrode

12: second electrode

15: Slot

111: first electrode layer

112: auxiliary electrode layer

113, 113A: insulating layer

114, 114A: second electrode layer

LC: liquid crystal layer

SB1: The first substrate

SB2: Second substrate

SL: signal feed-in line

Claims (13)

An adjustable planar antenna with filtering function, which includes: 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, which is arranged on the second surface and overlaps the signal feed-in line, includes: A first electrode layer with a slot; An auxiliary electrode layer disposed in the slot, the auxiliary electrode layer is electrically connected to the first electrode layer, and the auxiliary electrode layer and the first electrode layer belong 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 with the slot, the second electrode surface facing the second electrode layer; and A liquid crystal layer is arranged between the first electrode and the second electrode. The adjustable planar antenna with filtering function according to claim 1, wherein the first electrode, the liquid crystal layer, and the second electrode are sequentially stacked on the second surface. The adjustable planar antenna with filtering function according to claim 2, wherein the second electrode has a ring shape, and the second electrode partially overlaps the auxiliary electrode layer. The adjustable planar antenna with filtering function according to claim 2, wherein the auxiliary electrode layer has a ring shape, and the auxiliary electrode layer partially overlaps the second electrode. The adjustable planar antenna with filtering function according to claim 1, wherein the second electrode, the liquid crystal layer, and the first electrode are sequentially stacked on the second surface. According to claim 5, the adjustable planar antenna with filtering function, wherein the second electrode has a ring shape, and the second electrode partially overlaps the auxiliary electrode layer. The adjustable planar antenna with filtering function according to claim 5, wherein the auxiliary electrode layer has a ring shape, and the auxiliary electrode layer partially overlaps the second electrode. The adjustable planar antenna with filtering function according to claim 1, wherein there is an overlap area between the second electrode, the first electrode layer and the auxiliary electrode layer, and the area of the second electrode layer is larger than the overlap 0.1 times the area. The adjustable planar antenna with a filtering function according to claim 1, wherein the area of the second electrode layer is the same as the area of the first electrode layer. The tunable planar antenna with 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. The adjustable planar antenna with filtering function according to claim 1, further comprising 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 . The adjustable planar antenna with filtering function according to claim 11, further comprising a third substrate, and the signal feed line is arranged between the first substrate and the third substrate. The adjustable planar antenna with filtering function according to claim 12, wherein the first substrate, the second substrate and the third substrate are glass substrates.

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