CN114336056B - Antenna structure - Google Patents
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- CN114336056B CN114336056B CN202210031166.4A CN202210031166A CN114336056B CN 114336056 B CN114336056 B CN 114336056B CN 202210031166 A CN202210031166 A CN 202210031166A CN 114336056 B CN114336056 B CN 114336056B
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Abstract
一种天线结构包括第一基板、第二基板、第一液晶层、第一电极层、第二电极层以及反射层。第一基板与第二基板相对设置。第一液晶层设置在第一基板与第二基板之间。第一电极层设置在第一基板上，且位于第一液晶层与第一基板之间。第二电极层设置在第二基板上，且位于第一液晶层与第二基板之间。反射层设置在第二基板背离第二电极层的一侧。第一电极层、第二电极层和反射层相互重叠，且第一电极层具有至少一环状电极或至少一环状开口。
An antenna structure includes a first substrate, a second substrate, a first liquid crystal layer, a first electrode layer, a second electrode layer and a reflective layer. The first substrate and the second substrate are arranged opposite to each other. The first liquid crystal layer is arranged between the first substrate and the second substrate. The first electrode layer is arranged on the first substrate and is located between the first liquid crystal layer and the first substrate. The second electrode layer is arranged on the second substrate and is located between the first liquid crystal layer and the second substrate. The reflective layer is arranged on a side of the second substrate away from the second electrode layer. The first electrode layer, the second electrode layer and the reflective layer overlap each other, and the first electrode layer has at least one annular electrode or at least one annular opening.
Description
Technical Field
The present invention relates to a mobile communication technology, and in particular, to an antenna structure.
Background
With commercialization of the fifth generation mobile communication technology (5G), applications such as telemedicine, VR live broadcast, 4K image quality live broadcast, smart home, etc. have all had new development opportunities. Because 5G has the efficiency of high data rate, delay reduction, energy conservation, cost reduction, system capacity improvement, large-scale device connection and the like, operators in different fields can also carry out cross-boundary alliance, and a new generation of 5G ecological chain is built together. In order to increase the coverage of 5G millimeter waves, a reflection antenna is widely used.
Common reflective antennas can be further divided into passive array antennas and active array antennas. The passive array antenna has a fixed electromagnetic wave receiving angle and an outgoing angle due to a fixed antenna size. In contrast, since the active array antenna has the phase modulation capability of electromagnetic waves, the reception angle and the emission angle of electromagnetic waves can be adjusted. However, such active array antennas are typically used in combination with phase shifters to modulate the phase of electromagnetic waves. The larger the size of the array antenna, the higher the cost of using the phase shifter.
Disclosure of Invention
The invention provides an antenna structure which can be used for modulating the reflection frequency and the phase of electromagnetic waves and has lower production cost.
The antenna structure comprises a first substrate, a second substrate, a first liquid crystal layer, a first electrode layer, a second electrode layer and a reflecting layer. The first substrate and the second substrate are arranged opposite to each other. The first liquid crystal layer is disposed between the first substrate and the second substrate. The first electrode layer is arranged on the first substrate and is positioned between the first liquid crystal layer and the first substrate. The second electrode layer is arranged on the second substrate and is positioned between the first liquid crystal layer and the second substrate. The reflecting layer is arranged on one side of the second substrate, which is away from the second electrode layer. The first electrode layer, the second electrode layer and the reflecting layer are mutually overlapped, and the first electrode layer is provided with at least one annular electrode or at least one annular opening.
Based on the above, in the antenna structure according to an embodiment of the invention, the capacitive coupling effect generated by the partially overlapping relationship between the first electrode layer and the second electrode layer can be changed by the liquid crystal layer sandwiched between the two electrode layers. That is, the resonance frequency and phase of the induction circuit (or induction loop) formed by these electrode layers are modulatable. The antenna structure of the invention has the phase modulation function without matching with a phase shifter, thereby having more cost advantage. In addition, the antenna structure of the invention has smaller size, is more suitable for dense arrangement and forms an antenna array which can effectively inhibit side lobes (sidelobe) from forming.
Drawings
Fig. 1A and 1B are schematic top views of an antenna structure according to a first embodiment of the present invention in different directions.
Fig. 2 is a schematic cross-sectional view of the antenna structure of fig. 1A.
Fig. 3 is a graph of reflection coefficient S11 and phase versus frequency for the antenna structure of fig. 1A in different modes of operation.
Fig. 4 is a schematic diagram of an antenna array according to an embodiment of the invention.
Fig. 5A and 5B are schematic top views of an antenna structure according to a second embodiment of the present invention in different directions.
Fig. 6 is a schematic cross-sectional view of an antenna structure according to a third embodiment of the invention.
Fig. 7 is a graph of reflection coefficient S11 and phase versus frequency for the antenna structure of fig. 6 in different modes of operation.
Fig. 8 is a schematic cross-sectional view of an antenna structure according to a fourth embodiment of the invention.
Fig. 9 is a graph of reflection coefficient S11 and phase versus frequency for the antenna structure of fig. 8 in different modes of operation.
Fig. 10A and 10B are schematic top views of an antenna structure according to a fifth embodiment of the invention in different directions.
Fig. 11 is a schematic cross-sectional view of the antenna structure of fig. 10A.
Fig. 12 is a graph of reflection coefficient S11 and phase versus frequency for the antenna structure of fig. 10A in different modes of operation.
Reference numerals illustrate:
1 antenna array
10. 10A, 10B, 20, 30 antenna structure
50 Drive circuit board
101 First substrate
102 Second substrate
102S surface
103 Third substrate
104 Fourth substrate
110. 110A first electrode layer
112. 132 First ring electrode
112O first annular opening
114. 134 Second ring electrode
114O second annular opening
116. 136 Third ring electrode
120. 120A, 120B second electrode layer
120E extension portion
120Oe opening extension
120M main part
120Om opening main portion
122. 122A, 142 first strip electrode
122O first strip-shaped opening
124. 124A, 144 second strip electrode
124O second strip-shaped opening
130 Third electrode layer
140 Fourth electrode layer
150 Reflective layer
AG air layer
AU1, AU2 antenna unit
G. G': gap
LC1 first liquid crystal layer
LC2 second liquid crystal layer
OW1 first opening width
OW2 second opening width
S spacing
W is width
W1 first width
W2 second width
X, Y, Z direction
A-a ', B-B': section line
Detailed Description
As used herein, "about," "approximately," "essentially," or "substantially" includes both the values and average values within an acceptable deviation of the particular values as determined by one of ordinary skill in the art, taking into account the particular number of measurements and errors associated with the measurements (i.e., limitations of the measurement system) in question. For example, "about" may mean within one or more standard deviations of the stated values, or within, for example, ±30%, ±20%, ±15%, ±10%, ±5%. Further, as used herein, "about," "approximately," "essentially," or "substantially" may be used to select a range of more acceptable deviations or standard deviations depending on the measured, cut, or other property, and not one standard deviation may be used for all properties.
In the drawings, the thickness of layers, films, panels, regions, etc. are exaggerated for clarity. 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" may refer to physical and/or electrical connection. Furthermore, "electrically connected" may be used in a manner that other elements are present between the two elements.
Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.
Fig. 1A and 1B are schematic top views of an antenna structure according to a first embodiment of the present invention in different directions. Fig. 2 is a schematic cross-sectional view of the antenna structure of fig. 1A. Fig. 2 corresponds to section line A-A' of fig. 1A. Fig. 3 is a graph of reflection coefficient S11 and phase versus frequency for the antenna structure of fig. 1A in different modes of operation. Fig. 4 is a schematic diagram of an antenna array according to an embodiment of the invention.
Fig. 5A and 5B are schematic top views of an antenna structure according to a second embodiment of the present invention in different directions. For clarity of presentation, fig. 1A and 1B only show the first electrode layer 110 and the second electrode layer 120 of fig. 2.
Referring to fig. 1A, 1B and 2, the antenna structure 10 includes a first substrate 101, a second substrate 102, a first liquid crystal layer LC1, a first electrode layer 110 and a second electrode layer 120. The first substrate 101 is disposed opposite to the second substrate 102. The first liquid crystal layer LC1 is disposed between the first substrate 101 and the second substrate 102. The first electrode layer 110 is disposed on the first substrate 101 and is located between the first liquid crystal layer LC1 and the first substrate 101. The second electrode layer 120 is disposed on the second substrate 102 and is located between the first liquid crystal layer LC1 and the second substrate 102. In the present embodiment, the material of the first substrate 101 and the second substrate 102 is, for example, glass.
In the present embodiment, the first electrode layer 110 may include three ring electrodes separated from each other, namely, a first ring electrode 112, a second ring electrode 114 and a third ring electrode 116. The second ring electrode 114 is disposed around the first ring electrode 112. The third annular electrode 116 is disposed around the first annular electrode 112 and the second annular electrode 114. That is, the first, second and third ring electrodes 112, 114 and 116 may be regarded as an inner ring electrode, a middle ring electrode and an outer ring electrode of the first electrode layer 110, respectively (as shown in fig. 1A). It is particularly noted that the orthographic projection profile of these ring-shaped electrodes on the first substrate 101 is rectangular. More specifically, in the present embodiment, the front projection outer contour of the first annular electrode 112 on the first substrate 101 is a rectangular shape, and the front projection outer contours of the second annular electrode 114 and the third annular electrode 116 on the first substrate 101 are square, but not limited thereto.
On the other hand, the first ring electrode 112 and the second ring electrode 114 are different in pitch in different directions. For example, the spacing between the first ring electrode 112 and the second ring electrode 114 in the direction Y (i.e., the width W of the gap G) is smaller than the spacing S between the first ring electrode 112 and the second ring electrode 114 in the direction X, wherein the direction X intersects the direction Y. More specifically, the direction X may be substantially perpendicular to the direction Y, but is not limited thereto. In the present embodiment, the second ring-shaped electrode 114 has a first width W1 and a second width W2 in the direction Y and the direction X, respectively, and the first width W1 is larger than the second width W2. However, the present invention is not limited thereto. In other embodiments, the first width W1 may also be less than or substantially equal to the second width W2.
On the other hand, the second electrode layer 120 may include two stripe electrodes, namely, a first stripe electrode 122 and a second stripe electrode 124. The two strip electrodes are respectively disposed on two opposite sides of the first annular electrode 112 along the direction Y, and each of the strip electrodes is overlapped with the first annular electrode 112, the second annular electrode 114, and the gap G between the first annular electrode 112 and the second annular electrode 114. More specifically, the two strip electrodes of the second electrode layer 120 each have a main portion 120m and an extension portion 120e connected, wherein the main portion 120m overlaps the first annular electrode 112, the second annular electrode 114, and a gap G between the first annular electrode 112 and the second annular electrode 114, and the extension portion 120e extends on opposite sides of the main portion 120m along the direction X.
In the present embodiment, the extension portion 120e of each of the strip electrodes may be selectively partially overlapped with the second ring electrode 114 of the first electrode layer 110, but is not limited thereto. In other embodiments, the extension portion 120e of the stripe-shaped electrode (e.g., the first stripe-shaped electrode 122A and the second stripe-shaped electrode 124A) of the second electrode layer 120A of the antenna structure 10A may also be completely overlapped (as shown in fig. 5A and 5B) or not overlapped (not shown) with the second ring-shaped electrode 114 of the first electrode layer 110. The overlapping relationship herein means that the projections of the two members along the direction Z overlap. In the following paragraphs, unless otherwise mentioned, the overlapping relationship between the two members is also defined by the direction Z, and will not be described again.
By the capacitive coupling effect formed by the above-mentioned overlapping relationship of the main portion 120m of the stripe-shaped electrode of the second electrode layer 120 and the first ring-shaped electrode 112 and the second ring-shaped electrode 114 of the first electrode layer 110, two inductive loops can be formed on opposite sides of the first ring-shaped electrode 112 along the direction X. Since the first liquid crystal layer LC1 can be driven by the electric field to change its effective dielectric constant between the first electrode layer 110 and the second electrode layer 120, the resonance frequency and phase of the resonance circuit of the equivalent capacitance and the equivalent inductance formed between the first electrode layer 110, the second electrode layer 120 and the first liquid crystal layer LC1 can be modulated.
That is, the modulatable nature of the effective dielectric constant of the first liquid crystal layer LC1 allows the antenna structure 10 to modulate the frequency and phase of the primary electromagnetic waves (e.g., millimeter waves) that it reflects. Referring to fig. 3, when the first liquid crystal layer LC1 is not driven (i.e., the first electrode layer 110 and the second electrode layer 120 are not enabled), the curve C1a of the reflection coefficient S11 of the antenna structure 10 and the curve C2a of the electromagnetic wave phase to frequency are significantly different from the curve C1b of the reflection coefficient S11 of the antenna structure 10 and the curve C2b of the electromagnetic wave phase to frequency when the first liquid crystal layer LC1 is driven. For example, for electromagnetic waves whose phase falls around-100 degrees, whether the first liquid crystal layer LC1 is driven or not, the reflection dominant frequency of the electromagnetic waves can be changed, such as switching between the frequency 26.2GHz and the frequency 26.8 GHz. From another point of view, for electromagnetic waves having a frequency around 26.5GHz, the maximum phase modulation amount Δp1 that can be generated is about 200 degrees, if the first liquid crystal layer LC1 is driven or not.
The antenna structure 10 of the present embodiment has the capability of phase modulation without a phase shifter, so that the antenna structure has a cost advantage compared with the conventional antenna structure, and is beneficial to the large-size of the antenna structure. On the other hand, the antenna structure 10 of the present embodiment is also smaller, for example, the length of the antenna structure 10 along the direction X or the direction Y is about 0.3 times the wavelength of the electromagnetic wave to be reflected. Therefore, it is more suitable to be densely arranged on the driving circuit board 50 to constitute the antenna array 1 (as shown in fig. 4) capable of effectively suppressing the formation of side lobes.
Further, in order to increase the reflectivity of the antenna structure 10 for the target electromagnetic wave (e.g. millimeter wave), the antenna structure 10 further includes a reflective layer 150 disposed on a side of the second substrate 102 facing away from the second electrode layer 120. In the present embodiment, the reflective layer 150 is, for example, a metal conductive layer with a ground potential, and covers the surface 102s of the second substrate 102 away from the second electrode layer 120 entirely, but not limited thereto.
Other embodiments will be listed below to describe the present disclosure in detail, wherein like components will be denoted by like reference numerals, and descriptions of the same technical content will be omitted, and reference is made to the foregoing embodiments for parts, and the description thereof will not be repeated.
Fig. 6 is a schematic cross-sectional view of an antenna structure according to a third embodiment of the invention. Fig. 7 is a graph of reflection coefficient S11 and phase versus frequency for the antenna structure of fig. 6 in different modes of operation. Referring to fig. 6, the antenna structure 20 of the present embodiment is different from the antenna structure 10 of fig. 2 in the number of electrode layers and liquid crystal layers.
Specifically, the antenna structure 20 further includes a third substrate 103, a fourth substrate 104, a second liquid crystal layer LC2, a third electrode layer 130, and a fourth electrode layer 140. The third substrate 103 is disposed on a side of the first substrate 101 facing away from the second substrate 102. The fourth substrate 104 is disposed between the third substrate 103 and the first substrate 101. The second liquid crystal layer LC2 is disposed between the third substrate 103 and the fourth substrate 104. The third electrode layer 130 is disposed on the third substrate 103 and between the second liquid crystal layer LC2 and the third substrate 103. The fourth electrode layer 140 is disposed on the fourth substrate 104 and is located between the second liquid crystal layer LC2 and the fourth substrate 104. In this embodiment, the material of the third substrate 103 and the fourth substrate 104 is, for example, glass.
Similar to the first electrode layer 110, the third electrode layer 130 also includes three ring electrodes separated from each other, namely a first ring electrode 132, a second ring electrode 134, and a third ring electrode 136. The second ring electrode 134 is disposed around the first ring electrode 132. The third annular electrode 136 is disposed around the first annular electrode 132 and the second annular electrode 134. That is, the first, second, and third ring electrodes 132, 134, and 136 may be regarded as inner, middle, and outer ring electrodes of the third electrode layer 130, respectively.
On the other hand, similar to the second electrode layer 120, the fourth electrode layer 140 also includes two stripe electrodes, namely a first stripe electrode 142 and a second stripe electrode 144. The two strip electrodes are respectively disposed on two opposite sides of the first annular electrode 132 along the direction Y, and each of the strip electrodes is overlapped with the first annular electrode 132, the second annular electrode 134, and the gap G between the first annular electrode 132 and the second annular electrode 134.
Since the configuration relationship and the technical effects of the third electrode layer 130, the fourth electrode layer 140 and the second liquid crystal layer LC2 are similar to the combination of the first electrode layer 110, the second electrode layer 120 and the first liquid crystal layer LC1, the detailed description will be made in the related paragraphs of the foregoing embodiments, and the detailed description will be omitted.
It is particularly noted that the third electrode layer 130 and the fourth electrode layer 140 are overlapped with the first electrode layer 110, the second electrode layer 120, and the reflective layer 150. In the present embodiment, the third electrode layer 130 and the fourth electrode layer 140 may be disposed in alignment with the first electrode layer 110 and the second electrode layer 120, respectively, along the direction Z. From another point of view, the antenna structure of the present invention may also be a stacked structure of a plurality of antenna elements. For example, the antenna structure 20 of the present embodiment may be formed by stacking the antenna unit AU1 and the antenna unit AU 2. The antenna unit AU1 is the antenna structure 10 of fig. 2, and the other antenna unit AU2 is the antenna structure 10 of fig. 2 with the reflective layer 150 removed.
By overlapping the plurality of antenna elements, a larger amount of phase modulation or frequency modulation can be further achieved. Referring to fig. 7, when the first liquid crystal layer LC1 and the second liquid crystal layer LC2 are not driven (i.e. the first electrode layer 110, the second electrode layer 120, the third electrode layer 130 and the fourth electrode layer 140 are not enabled), the curve C3a of the reflection coefficient S11 of the antenna structure 20 and the curve C4a of the electromagnetic wave phase versus frequency are significantly different from the curve C3b of the reflection coefficient S11 of the antenna structure 20 and the curve C4b of the electromagnetic wave phase versus frequency when the first liquid crystal layer LC1 and the second liquid crystal layer LC2 are driven.
For example, for electromagnetic waves whose phases fall around-110 degrees, whether the first liquid crystal layer LC1 and the second liquid crystal layer LC2 are driven or not can significantly change the reflection dominant frequency of the electromagnetic waves, such as switching between the frequency 24.8GHz and the frequency 25.9 GHz. From another point of view, for electromagnetic waves having a frequency around 25.3GHz, the maximum phase modulation amount Δp2 that can be generated is about 310 degrees, if the first liquid crystal layer LC1 and the second liquid crystal layer LC2 are driven or not. The antenna structure 20 of the present embodiment has the capability of phase modulation without a phase shifter, so that the antenna structure has a cost advantage compared with the conventional antenna structure, and is beneficial to the large-size of the antenna structure.
Fig. 8 is a schematic cross-sectional view of an antenna structure according to a fourth embodiment of the invention. Fig. 9 is a graph of reflection coefficient S11 and phase versus frequency for the antenna structure of fig. 8 in different modes of operation. Referring to fig. 8 and 9, the antenna structure 10B of the present embodiment is different from the antenna structure 10 of fig. 2 in that an air layer AG is disposed between the reflective layer 150 of the antenna structure 10B and the second substrate 102. By providing the air layer AG, the frequency dependence of the maximum phase modulation amount Δp3 that can be generated by the antenna structure 10B for electromagnetic waves in the vicinity of a specific frequency can be reduced.
When the first liquid crystal layer LC1 is not driven (i.e., the first electrode layer 110 and the second electrode layer 120 are not enabled), the curve C5a of the reflection coefficient S11 of the antenna structure 10B and the curve C6a of the electromagnetic wave phase versus frequency are significantly different from the curve C5B of the reflection coefficient S11 of the antenna structure 10B and the curve C6B of the electromagnetic wave phase versus frequency when the first liquid crystal layer LC1 is driven. For example, for an electromagnetic wave having a frequency around 16.9GHz, the maximum phase modulation amount DeltaP 3 that can be generated is about 200 degrees, and the dependence of the frequency is less obvious for an electromagnetic wave having a frequency range between 16.7GHz and 17.1 GHz. That is, the antenna structure 10B of the present embodiment can generate a considerable maximum phase modulation Δp3 for electromagnetic waves having a frequency ranging from 16.7GHz to 17.1GHz, which is helpful for increasing the operation flexibility of the antenna structure 10B.
Fig. 10A and 10B are schematic top views of an antenna structure according to a fifth embodiment of the invention in different directions. Fig. 11 is a schematic cross-sectional view of the antenna structure of fig. 10A. Fig. 11 corresponds to section line B-B' of fig. 10A. Fig. 12 is a graph of reflection coefficient S11 and phase versus frequency for the antenna structure of fig. 10A in different modes of operation. For clarity of presentation, fig. 10A and 10B only show the first electrode layer 110 and the second electrode layer 120 of fig. 2.
Referring to fig. 10A, 10B and 11, the antenna structure 30 of the present embodiment is different from the antenna structure 10 of fig. 1A in that the electrode patterns of the electrode layers are arranged in different manners. Specifically, the first electrode layer 110A of the antenna structure 30 has a first annular opening 112O and a second annular opening 114O. The second annular opening 114O is disposed around the first annular opening 112O. In the present embodiment, the second annular opening 114O has a first opening width OW1 and a second opening width OW2 in the direction Y and the direction X, respectively, and the first opening width OW1 is larger than the second opening width OW2. However, the present invention is not limited thereto. In other embodiments, the first opening width OW1 may also be less than or substantially equal to the second opening width OW2.
On the other hand, the second electrode layer 120B has a first stripe-shaped opening 122O and a second stripe-shaped opening 124O. It is particularly noted that the first strip-shaped opening 122O and the second strip-shaped opening 124O are disposed on opposite sides of the first annular opening 112O along the direction Y, and each partially overlaps the first annular opening 112O and the second annular opening 114O. For example, the first stripe-shaped opening 122O and the second stripe-shaped opening 124O of the second electrode layer 120B each have an opening main portion 120om and an opening extension portion 120oe that are in communication. The opening main portion 120om overlaps the first annular opening 112O and the second annular opening 114O. The opening extension 120oe extends on opposite sides of the opening main 120om along the direction X.
In the present embodiment, the opening extension portions 120oe of the respective strip-shaped openings may optionally partially overlap the second annular opening 114O of the first electrode layer 110A, but not limited thereto. In other embodiments, not shown, the opening extension 120oe of the strip-shaped opening of the second electrode layer of the antenna structure may also completely overlap or not overlap the second annular opening 114O of the first electrode layer 110A.
By the capacitive coupling effect formed by the above overlapping relationship between the opening main portion 120om of the stripe-shaped opening of the second electrode layer 120B and the first annular opening 112O and the second annular opening 114O of the first electrode layer 110A, two inductive loops can be formed on opposite sides of the first annular opening 112O along the direction X. Since the first liquid crystal layer LC1 can be driven by the electric field to change its effective dielectric constant between the first electrode layer 110A and the second electrode layer 120B, the resonance frequency and phase of the resonance circuit of the equivalent capacitance and the equivalent inductance formed between the first electrode layer 110A, the second electrode layer 120B and the first liquid crystal layer LC1 can be modulated.
That is, the modulatable nature of the effective dielectric constant of the first liquid crystal layer LC1 allows the antenna structure 30 to modulate the frequency and phase of the primary electromagnetic waves (e.g., millimeter waves) that it reflects. Referring to fig. 12, when the first LC layer LC1 is not driven (i.e. the first electrode layer 110A and the second electrode layer 120B are not enabled), the curve C7a of the reflection coefficient S11 of the antenna structure 30 and the curve C8a of the electromagnetic wave phase versus frequency are significantly different from the curve C7B of the reflection coefficient S11 of the antenna structure 30 and the curve C8B of the electromagnetic wave phase versus frequency when the first LC layer LC1 is driven. For example, for electromagnetic waves whose phase falls around-100 degrees, whether the first liquid crystal layer LC1 is driven or not, the reflection dominant frequency of the electromagnetic waves can be changed, such as switching between the frequency 18.1GHz and the frequency 18.9 GHz. From another point of view, for electromagnetic waves having a frequency around 18.5GHz, the maximum phase modulation amount Δp4 that can be generated is about 170 degrees, if the first liquid crystal layer LC1 is driven or not. That is, the antenna structure 30 of the present embodiment can have the capability of phase modulation without a phase shifter, which is more cost-effective than the conventional antenna structure, and contributes to the large-size of the antenna structure.
In summary, in the antenna structure according to an embodiment of the invention, the capacitive coupling effect generated by the partially overlapping relationship between the first electrode layer and the second electrode layer can be changed by the liquid crystal layer sandwiched between the two electrode layers. That is, the resonance frequency and phase of the induction circuit (or induction loop) formed by these electrode layers are modulatable. The antenna structure of the invention has the phase modulation function without matching with a phase shifter, thereby having more cost advantage. In addition, the antenna structure of the invention has smaller size, is more suitable for dense arrangement and forms an antenna array which can effectively inhibit side lobes (sidelobe) from forming.
Claims (13)
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| US202163169431P | 2021-04-01 | 2021-04-01 | |
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| TW110128676A TWI779757B (en) | 2021-04-01 | 2021-08-04 | Antenna structure |
| TW110128676 | 2021-08-04 |
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| CN208818972U (en) * | 2018-08-10 | 2019-05-03 | 北京京东方传感技术有限公司 | Phase shifter and LCD antenna |
| CN113196569A (en) * | 2018-12-12 | 2021-07-30 | 夏普株式会社 | Scanning antenna and method for manufacturing scanning antenna |
| CN110459870A (en) * | 2019-01-30 | 2019-11-15 | 友达光电股份有限公司 | Antenna unit and antenna device |
| CN112490676A (en) * | 2020-06-03 | 2021-03-12 | 友达光电股份有限公司 | Adjustable planar antenna with filtering function |
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| CN114336056A (en) | 2022-04-12 |
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