TW202147686A - 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 built-in filter function

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

The planar dipole antenna adopts an electronic non-mechanical rotating beam scanning method, which has the advantages of high stability, beam gain increases with the increase of the number of antenna elements, and small size and high integration. Millimeter-wave radar that can be applied to automatic driving assistance systems (ADAS), automatic navigation and physiological signature (Vital sign) remote monitoring of unmanned aerial vehicles (BVLOS), 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 a material with a modulated permittivity (permittivity) around the electrode, such as liquid crystal, and uses a voltage to control the direction of the liquid crystal molecules, changing the permittivity of the liquid crystal material, and then changing the resonance. The value of the capacitance in the circuit makes the resonant frequency different. In other words, by giving the liquid crystal different control voltages, the antenna unit can generate different resonance frequency responses, adjust the appropriate antenna operating frequency, control the radiation intensity of electromagnetic waves, and arrange the antenna units in an array, by controlling the switch of each antenna unit. , to achieve the beam scanning function of a specific angle.

The present invention improves the deficiencies of the prior art by designing an adjustable planar antenna with a self-contained filtering function, thereby enhancing the implementation and utilization in the industry.

In view of the above-mentioned problems of the prior art, an object 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 driving circuit and the radio frequency circuit.

According to the above purpose, an embodiment of the present invention provides an adjustable planar antenna with a filter function, which 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 opposite to the first surface, and the signal feeding lines are arranged on the first surface. The first electrode is disposed on the second surface and overlaps with the signal feeding 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 arranged 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 be annular, and the second electrode and the auxiliary electrode layer are partially overlapped. 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 present invention, the second electrode, the liquid crystal layer and the first electrode can be stacked on the second surface in sequence, wherein the second electrode can be annular, and the second electrode and the auxiliary electrode layer are partially overlapped. 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 present invention, the second electrode has an overlapping area with 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 overlapping area.

In an embodiment of the present invention, the area of the second electrode layer may be the same as that 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 filter 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 filter 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.

Based on the above, according to the adjustable planar antenna with filter function disclosed in the embodiment of the present invention, a first electrode layer, an insulating layer and a second electrode layer can be arranged on the first electrode to form a flat capacitor structure. An isolation capacitor is formed between the liquid crystal driving 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 facilitate the understanding of the technical features, content and advantages of the present invention and the effects that can be achieved, the present invention is hereby described in detail with the accompanying drawings, and in the form of embodiments as follows, and the drawings used therein are only for the purpose of For the purpose of illustrating and assisting the description, it is not necessarily the real proportion and precise configuration after the implementation of the present invention. Therefore, the proportion and configuration relationship of the attached drawings should not be interpreted or limited to the scope of rights of the present invention in actual implementation. Say Ming.

In the drawings, the thickness or width of layers, films, panels, regions, light guides, etc., are exaggerated for clarity. The same reference numerals refer to the same 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 Intermediate 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" may refer to a physical and/or electrical connection. Furthermore, "electrically connected" or "coupled" may refer to the existence of other elements between the two elements. Furthermore, it will be understood that, although the terms “first,” “second,” and “third” may be used herein to describe various elements, components, regions, layers and/or sections, they are , region, layer and/or section is distinguished from another element, component, region, layer and/or section. Therefore, it is for descriptive purposes only and should not be construed to indicate or imply relative importance or their sequential relationship.

Unless otherwise defined, 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 construed as having meanings consistent with their meanings in the context of the related art and the present invention, and are not to be construed as idealized or excessive Formal meaning unless expressly so defined herein.

Please refer to FIGS. 1A to 1C at the same time, which are schematic diagrams of a tunable planar antenna with a filter function according to an embodiment of the present invention, FIG. 1A is a schematic plan view of an adjustable planar antenna with a filter function, and FIG. 1B FIG. 1A is a schematic cross-sectional view along the dotted line AA' in FIG. 1A, and FIG. 1C is a cross-sectional schematic view along the dotted line AA' in FIG. 1A in another embodiment. As shown in the figure, the tunable planar antenna 1 includes a first substrate SB1, a signal feeding line SL, a first electrode 11, a second electrode 12 and a liquid crystal layer LC, and the signal feeding line SL is disposed 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, and an accommodation is formed in the first electrode layer 111 space, the auxiliary electrode layer 112 is disposed in the accommodating space formed by the slot hole 15 . The auxiliary electrode layer 112 may have 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 can 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 corresponding to the portion of the auxiliary electrode layer 112 in the structure of the slot 15 , an insulating layer 113A and a second electrode layer 114A are also sequentially disposed.

In this embodiment, the second electrode 12 is an annular structure, which is disposed on the upper surface of the first substrate SB1 , and the disposed position overlaps the slot hole 15 . As shown in FIG. 1A , the annular structure of the second electrode 12 overlaps the auxiliary electrode 112 in the slot hole 15 , and the outer side of the annular shape overlaps part of the first electrode layer 111 . The liquid crystal layer LC is disposed between the first electrode 11 and the second electrode 12. The voltage of the first electrode 11 and the second electrode 12 controls the direction of liquid crystal molecules in the liquid crystal layer LC, thereby changing the dielectric coefficient of the liquid crystal material. A resonant circuit (LC resonance circuit) of equivalent inductance and capacitance is formed between the metal electrode of the planar antenna and the liquid crystal material, and the resonance frequency of the circuit is related to the equivalent inductance and equivalent capacitance. As the dielectric constant of the liquid crystal material changes, the equivalent capacitance value in the equivalent circuit changes, and therefore the resonant frequency is different. In other words, by applying different control voltages to the liquid crystal molecules through the metal electrodes, the planar antenna can generate different resonance 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 terminal of the liquid crystal driving signal, and the ring structure is The Vdata terminal changes the equivalent capacitance value through 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 and the first electrode layer 111 are electrically connected, the circuit for RF feeding and the circuit for driving the liquid crystal share the ground terminal. The charge at the Vcom terminal of the liquid crystal driving circuit will be disturbed 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 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 ground terminal of the LCD, that is, through the flat capacitor structure formed by the first electrode layer 111, the insulating layer 113 and the second electrode layer 114, so that the Vcom terminal of the low-frequency liquid crystal driving signal can be connected to the high-frequency liquid crystal driving signal through the relationship between the insulating layer 113. The ground terminal of the RF signal is considered to be electrically isolated. The isolation capacitor described here is regarded as short-circuit conduction under the RF signal, and does not affect the operation of the planar antenna.

The above-mentioned isolation capacitor will form a loop of a high-pass filter with the characteristic impedance of the RF feed, such as 50Ω. The cut-off frequency of this 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 planar 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 FIG. 1B , the tunable planar antenna 1 may include a second substrate SB2 , the second substrate SB2 may be used as a structure for sealing the liquid crystal layer LC, and the second electrode 12 may 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 feeding 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 process. In another embodiment, the adjustable 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, so that the signal The feeding 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 a tunable planar antenna with a filter function according to another embodiment of the present invention, and FIG. 2A is a schematic plan view of a tunable planar antenna with a filter function. Figure 2B is a schematic cross-sectional view along the dotted line BB' in Figure 2A. As shown in the figure, the tunable planar antenna 2 includes a first substrate SB1, a second substrate SB2, a third substrate SB3, a signal feeding line SL, a first electrode 21, a second electrode 22 and a liquid crystal layer LC. The signal feeding 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 disposed on the upper surface of the first substrate SB1 , and the first electrode 21 overlaps the signal feeding line SL. In this embodiment, the tunable planar antenna 2 includes a first substrate SB1, a second substrate SB2, and a third substrate SB3, but the present disclosure is not limited thereto, the signal feeding line SL and the first electrode 21 can be provided by a double-sided process On both side surfaces of the first substrate SB1, the tunable planar antenna 2 only includes the first substrate SB1 and the second substrate SB2.

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 and is provided in the The slot hole 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, and insulating layers 213 and 213A and second electrode layers 214 and 214A are respectively disposed on the first electrode layer 211 and the auxiliary electrode layer 212 in sequence. The second electrode 22 is an annular structure, and its installation position overlaps with the slot hole 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 form a plate capacitor to form an isolation capacitor between the liquid crystal driving circuit and the radio frequency circuit. The difference from the previous embodiment lies in the setting area of the second electrode layer 214 . In FIGS. 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 fabrication Material cost required for the second electrode layer 114 . However, compared with 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 larger than 0.1 times the projected area to maintain its operation effect.

Please refer to FIG. 3A and FIG. 3B at the same time, which are schematic diagrams of a tunable planar antenna with a filter function according to another embodiment of the present invention, and FIG. 3A is a schematic plan view of the tunable planar antenna with a filter function. FIG. 3B is a schematic cross-sectional view along the dotted line CC' in FIG. 3A. As shown in the figure, the tunable planar antenna 3 includes a first substrate SB1, a second substrate SB2, a third substrate SB3, a signal feeding line SL, a first electrode 31, a second electrode 32 and a liquid crystal layer LC. The signal feeding 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 disposed on the upper surface of the first substrate SB1 , and the first electrode 31 overlaps the signal feeding line SL. The arrangement of the first substrate SB1 , the second substrate SB2 , and the third substrate SB3 is similar to that of the previous 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 arranged in the slot 35 , which is electrically connected to the first electrode layer 311 through the connecting 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 respectively disposed on the first electrode layer 311 and the auxiliary electrode layer 312 in sequence. In this embodiment, the auxiliary electrode layer 312 has a ring structure and the second electrode 22 has a rectangular structure. 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 radio frequency circuit, so as to prevent the Vcom terminal charge of the liquid crystal driving circuit from being interfered by the ground terminal, and the resulting 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 a filter function according to still another embodiment of the present invention, and FIG. 4A is a schematic plan view of the tunable planar antenna with a filter function. FIG. 4B is a schematic cross-sectional view along the dotted line DD' 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 feeding line SL, a first electrode 41, a second electrode 42 and a liquid crystal layer LC, and the signal feeding line SL is arranged 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 in this embodiment are sequentially disposed on the upper surface of the first substrate SB1 , so the signal feeding line SL and the first electrode 41 are formed The signal feeding circuit is located on the outside, and the liquid crystal control circuit formed by the first electrode 41 and the second electrode 42 is located on the inside. In this embodiment, the tunable planar antenna 4 includes a first substrate SB1, a second substrate SB2, and a third substrate SB3, but the present disclosure is not limited thereto, the signal feeding line SL and the second electrode 42 can be provided by a double-sided process On both side surfaces of the first substrate SB1, the tunable planar antenna 4 only includes the first substrate SB1 and the second substrate SB2.

In this embodiment, the first electrode 41 also overlaps 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 It can be arranged on the lower surface of the second substrate SB2, wherein the first electrode layer 411 has a hollow slot 45 structure, and a accommodating space can be formed in the first electrode layer 411, and the auxiliary electrode layer 412 is formed in the slot 45. in the accommodation space. The auxiliary electrode layer 412 has a rectangular structure, 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 fabricated 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 corresponding to the portion of the auxiliary electrode layer 412 in the structure of the slot 45 , an insulating layer 413A and a second electrode layer 414A are also sequentially disposed. The second electrode 42 is an annular structure, which is disposed on the upper surface of the first substrate SB1 , and the disposed position overlaps the slot hole 45 . The direction of the liquid crystal molecules in the liquid crystal layer LC is controlled through the first electrode 41 and the second electrode 42 , thereby changing the dielectric coefficient of the material, and thus changing the resonant 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 in the first electrode 41 can form a plate capacitor, which acts as an isolation capacitor between the liquid crystal driving circuit and the radio frequency circuit, so as to prevent the Vcom terminal charge of the liquid crystal driving circuit from being affected by the ground terminal. interference, resulting in the problem that the charge cannot be accumulated enough to make the voltage difference between Vdata and Vcom reach a predetermined value. The isolation capacitor will form a loop of a high-pass filter with the characteristic impedance of the RF feed. The cutoff 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 a filter function according to another embodiment of the present invention, and FIG. 5A is a schematic plan view of a tunable planar antenna with a filter function, FIG. 5B is a schematic cross-sectional view along the dashed line EE' 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 feeding line SL, a first electrode 51, a second electrode 52 and a liquid crystal layer LC, and the signal feeding line SL is arranged 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 between 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 disposed on the upper surface of the first substrate SB1 , so the signal feeding circuit formed by the signal feeding 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 that of the previous embodiment, and the same parts are not described again.

The first electrode 51 overlaps with the signal feeding 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, which can form an accommodating space in the first electrode layer 511 , and the auxiliary electrode layer 512 is disposed in the accommodating space formed by the slot 55 . The auxiliary electrode layer 512 has a rectangular structure, 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 fabricated 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 corresponding to the auxiliary electrode layer 512 in the structure of the slot 55 , an insulating layer 513A and a second electrode layer 514A are also sequentially disposed. The second electrode 52 is an annular structure, which is disposed on the upper surface of the first substrate SB1 , and the disposed position overlaps the slot hole 55 . Different from the embodiments shown in FIGS. 4A and 4B , the area of the second electrode layer 514 in this embodiment is smaller than that of the first electrode layer 511 , which saves the material cost required for fabricating the second electrode layer 514 . However, compared with 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 the projected area to maintain its operation effect.

The first electrode layer 511 , the insulating layer 513 and the second electrode layer 514 in the first electrode 51 can form a plate capacitor, which acts as an isolation capacitor between the liquid crystal driving circuit and the radio frequency circuit to prevent the Vcom terminal charge of the liquid crystal driving circuit from being affected by the ground terminal. interference, resulting in the problem that the charge cannot be accumulated enough to make the voltage difference between Vdata and Vcom reach a predetermined value.

Please refer to FIG. 6A and FIG. 6B at the same time, which are schematic diagrams of a tunable planar antenna with a filter function according to still another embodiment of the present invention, and FIG. 6A is a schematic plan view of a tunable planar antenna with a filter function. FIG. 6B is a schematic cross-sectional view along the dashed line FF' 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 feeding line SL, a first electrode 61, a second electrode 62 and a liquid crystal layer LC, and the signal feeding line SL is arranged 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 between 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 disposed on the upper surface of the first substrate SB1 , so the signal feeding circuit formed by the signal feeding line SL and the first electrode 61 is located on the 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 that of the previous embodiment, and the same parts are not described again.

The first electrode 61 overlaps with 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 are disposed on the second substrate SB2. On the lower surface, the first electrode layer 611 has a hollow slot hole 55 structure, which can form an accommodating space in the first electrode layer 611 , and the auxiliary electrode layer 612 is disposed in the accommodating space formed by the slot hole 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 fabricated in the same process. In addition, an insulating layer 613 and a second electrode layer 614 are disposed on the first electrode layer 611 in sequence, and corresponding to the auxiliary electrode layer 612 in the structure of the slot 65 , an insulating layer 613A and a second electrode layer 614A are also disposed in sequence. The second electrode 62 has a rectangular structure, and is disposed on the upper surface of the first substrate SB1 , and the disposed position overlaps the slot hole 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, which acts as an isolation capacitor between the liquid crystal driving circuit and the radio frequency circuit, so as to prevent the Vcom terminal charge of the liquid crystal driving circuit from being affected by the ground terminal. interference, resulting in the problem that the charge cannot be accumulated enough to make the voltage difference between Vdata and Vcom reach a predetermined value.

The above description is exemplary only, not limiting. Any equivalent modifications or changes that do not depart from the spirit and scope of the present invention shall be included in the appended patent application scope.

1, 2, 3, 4, 5, 6: Adjustable planar antenna 11, 21, 31, 41, 51, 61: The first electrode 12, 22, 32, 42, 52, 62: Second electrode 15, 25, 35, 45, 55, 65: Slotted holes 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: Insulation 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 line

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

1: Adjustable planar antenna

11: The first electrode

12: The second electrode

15: Slotted hole

111: the first electrode layer

112: auxiliary electrode layer

113,113A: Insulation layer

114, 114A: Second Electrode Layer

LC: liquid crystal layer

SB1: The first substrate

SB2: Second substrate

SL: Signal feed line

Claims (13)

An adjustable planar antenna with its own filtering function, which includes: a first substrate including a first surface and a second surface opposite to the first surface; a signal feeding line disposed on the first surface; A first electrode, disposed on the second surface and overlapping with the signal feed line, includes: a first electrode layer with a slot; an auxiliary electrode layer 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; 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 hole, the second electrode facing the second electrode layer; and A liquid crystal layer is disposed between the first electrode and the second electrode. The adjustable planar antenna with filter function as claimed in claim 1, wherein the first electrode, the liquid crystal layer and the second electrode are sequentially stacked and disposed on the second surface. The adjustable planar antenna with filter function as claimed in claim 2, wherein the second electrode is annular, and the second electrode partially overlaps with the auxiliary electrode layer. The adjustable planar antenna with filter function as claimed in claim 2, wherein the auxiliary electrode layer is annular, and the auxiliary electrode layer partially overlaps with the second electrode. The tunable planar antenna with filter function as claimed in claim 1, wherein the second electrode, the liquid crystal layer and the first electrode are sequentially stacked on the second surface. The adjustable planar antenna with filter function as claimed in claim 5, wherein the second electrode is annular, and the second electrode partially overlaps with the auxiliary electrode layer. The adjustable planar antenna with filter function as claimed in claim 5, wherein the auxiliary electrode layer is annular, and the auxiliary electrode layer partially overlaps with the second electrode. The adjustable planar antenna with filtering function as claimed in claim 1, wherein there is an overlapping 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 overlapping area 0.1 times the area. The adjustable planar antenna with filtering function according to claim 1, wherein the area of the second electrode layer is the same as that of the first electrode layer. The adjustable 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 filter function as claimed in claim 1, further comprising a second substrate, 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 filter function as claimed in claim 11 further includes a third substrate, and the signal feed line is disposed between the first substrate and the third substrate. The adjustable planar antenna with filter function as claimed in claim 12, wherein the first substrate, the second substrate and the third substrate are glass substrates.

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