Antenna device

Abstract

The present invention relates to an antenna device comprising: a plurality of printed circuit boards disposed to be overlapped in a vertical direction; a feeding pattern formed on at least one of the plurality of printed circuit boards to generate and radiate an electromagnetic wave signal; and a plurality of radiating elements spaced apart from the feeding pattern to exhibit multiple resonances in an indirect coupling manner so as to generate an electromagnetic signal and radiate same to the air. The antenna device can adjust resonant frequencies by using the radiating elements disposed on several layers, exhibiting broadband properties.

Description

antenna device

[0001] The present invention relates to an electronic device including an antenna device, and more particularly, to an antenna device having broadband characteristics by forming a dual resonance in an indirect coupling manner.

[0002] Typically, communication terminals are equipped with an antenna device for transmitting and receiving electromagnetic waves. This antenna device resonates at a specific frequency band, transmitting and receiving electromagnetic waves within that frequency band.

[0003] Frequency and wavelength are inversely proportional. The length of an antenna can be selected based on the wavelength. Therefore, antennas require sufficient physical structure for the frequency. However, to accommodate antennas within a smaller space than the wavelength corresponding to the frequency, the antenna is sometimes formed in a meander pattern to achieve the desired length. While this approach achieves the desired physical length, it can also lead to performance degradation due to the generation of a region where the antenna currents cancel each other out. Furthermore, the antenna's reflection coefficient can be adjusted using a matching circuit. Furthermore, the introduction of grounding for antenna matching narrows the antenna's bandwidth. However, when developing a common module for multiple models, the antenna resonance frequency differs across models, making it difficult to utilize as a common module.

[0004] The purpose of the present invention is to provide an antenna device capable of easily controlling capacitance and inductance.

[0005] Another object of the present invention is to provide an antenna device capable of adjusting the resonant frequency band without increasing the physical size of the antenna device.

[0006] Another object of the present invention is to provide a common module including an antenna device that can be applied simultaneously to multiple electronic devices.

[0007] An antenna device according to the present invention for achieving this purpose is characterized by having a configuration capable of implementing multiple resonances in an indirect feeding manner.

[0008] Another feature of the antenna device according to the present invention is that a plurality of radiators are arranged on a plurality of layers of printed circuit boards.

[0009] An antenna device according to the present invention is characterized by comprising: a plurality of printed circuit boards arranged to overlap each other in a vertical direction; a feeding pattern formed on at least one of the plurality of printed circuit boards to generate and radiate an electromagnetic wave signal; and at least one radiator that resonates with the feeding pattern in an indirect coupling manner to generate an electromagnetic wave signal and radiate the electromagnetic wave signal into the air.

[0010] In an antenna device according to one embodiment of the present invention, the radiator may be composed of a plurality of radiators arranged on different printed circuit boards.

[0011] In an antenna device according to one embodiment of the present invention, at least one of the plurality of radiators may be arranged on the same printed circuit board as the feeding pattern.

[0012] In an antenna device according to one embodiment of the present invention, at least one of the plurality of radiators may have a larger area than a feeding pattern arranged on the same printed circuit board.

[0013] In an antenna device according to one embodiment of the present invention, the plurality of radiators may have different lengths.

[0014] In an antenna device according to one embodiment of the present invention, the plurality of radiators may have different areas.

[0015] In an antenna device according to one embodiment of the present invention, the plurality of radiators can resonate to transmit and receive signals of different frequency bands.

[0016] In an antenna device according to one embodiment of the present invention, at least two of the plurality of radiators can overlap in a vertical direction.

[0017] In an antenna device according to one embodiment of the present invention, the overlapping area may be 90% or more of the area of ​​any one radiator.

[0018] In an antenna device according to one embodiment of the present invention, the feeding pattern may include a shape branching into a plurality of parts or a closed loop shape.

[0019] In an antenna device according to one embodiment of the present invention, at least one radiator may be made of a conductive material.

[0020] In an antenna device according to an embodiment of the present invention, the at least one radiator may include at least one of silver (Ag), palladium (Pd), platinum (Pt), copper (Gu), gold (Au), and nickel (Ni).

[0021] The antenna device according to the present invention utilizes radiators arranged in multiple layers to achieve a resonant frequency and achieve a wideband effect. Furthermore, by configuring an indirectly fed antenna with different phase differences in a device with a narrow internal space, it is possible to achieve a wideband characteristic that includes a low-frequency band without the resonant frequencies canceling each other out.

[0022] Figure 1 is an exploded perspective view of an antenna device according to the present invention.

[0023] FIG. 2a and FIG. 2b are exemplary drawings showing the shape of a radiator and a feeding pattern formed on a first printed circuit board of an antenna device according to a first embodiment of the present invention.

[0024] FIG. 3 is an exemplary diagram showing the shape of a radiator and a power supply pattern formed on a second printed circuit board of an antenna device according to a first embodiment of the present invention.

[0025] FIG. 4a and FIG. 4b are exemplary drawings showing the shapes of a radiator and a feeding pattern formed on a first printed circuit board of an antenna device according to a second embodiment of the present invention.

[0026] FIG. 5a and FIG. 5b are exemplary views showing the shapes of a radiator and a feeding pattern formed on a first printed circuit board of an antenna device according to a third embodiment of the present invention.

[0027] FIG. 6a and FIG. 6b are exemplary diagrams showing the S parameters of a typical antenna and an antenna according to the present invention measured using a network analyzer.

[0028] With respect to the embodiments of the present invention disclosed in the text, specific structural and functional descriptions are merely illustrative for the purpose of explaining the embodiments of the present invention, and the embodiments of the present invention may be implemented in various forms and should not be construed as being limited to the embodiments described in the text.

[0029] The present invention is susceptible to various modifications and takes various forms. Specific embodiments are illustrated in the drawings and described in detail herein. However, this is not intended to limit the present invention to specific disclosed forms, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention.

[0030] While terms like "first" and "second" may be used to describe various components, these components are not limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a first component could be referred to as a "second component," and similarly, a second component could also be referred to as a "first component."

[0031] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components in between. Conversely, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between. Other expressions that describe the relationship between components, such as "between" and "immediately between" or "adjacent to" and "directly adjacent to", should be interpreted similarly.

[0032] The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprises" or "has" indicate the presence of a disclosed feature, number, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0033] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted to have a meaning consistent with their meaning in the context of the relevant technology, and shall not be construed in an idealized or overly formal sense unless explicitly defined herein.

[0034] Meanwhile, if a particular embodiment can be implemented differently, the functions or operations specified within a particular block may occur in a different order than specified in the flowchart. For example, two consecutive blocks may actually be performed substantially simultaneously, or, depending on the related functions or operations, the blocks may be performed in reverse order.

[0035] Hereinafter, an antenna device according to the present invention will be described with reference to the attached drawings. For convenience, the antenna device will be described using a Cartesian coordinate system (x-axis, y-axis, z-axis), but it is obvious that the antenna device can also be described using other coordinate systems. In addition, according to the Cartesian coordinate system, the x-axis, y-axis, and z-axis are orthogonal to each other, but the embodiment is not limited thereto. That is, the x-axis, y-axis, and z-axis may also intersect each other.

[0036] Figure 1 is an exploded perspective view of an antenna device according to the present invention.

[0037] An antenna device (100) comprises a plurality of printed circuit boards (Layer 1 to Layer 4, 110) arranged to overlap each other in a vertical direction, a power supply pattern (200) formed on at least one of the plurality of printed circuit boards (Layer 1 to Layer 4) to generate and radiate an electromagnetic wave signal, and a radiator (300) spaced apart from the power supply pattern (200) to resonate in an indirect coupling manner to generate an electromagnetic wave signal and radiate the same into the air.

[0038] Each substrate is composed of an antenna portion (111, 121, 131, 141) and a circuit portion (112, 122, 132, 142). In this embodiment, an antenna device is shown in which four substrates (Layer 1 to Layer 4) are stacked vertically. Although this embodiment shows that four substrates are stacked, the present invention is not limited thereto. If a method of indirectly feeding power can be implemented by installing a feeding pattern and a radiator, the number of stacked substrates can vary.

[0039] In addition, although this embodiment shows that antenna elements are arranged in Layer 1 and Layer 2, the present invention is not limited thereto and can be implemented in various combinations. For example, radiators can be arranged in all of Layer 1 to Layer 4 and the feeding method can be implemented in an indirect feeding method for each radiator, or they can be arranged in Layer 1 and Layer 3, or implemented in Layer 2 only, or implemented in various forms such as Layer 1 and / or Layer 3. By overlapping antenna structures in this way, combinations of capacitances and inductances of the antennas are possible. The antenna device according to the present invention can implement a method of feeding multiple radiators using one feeding pattern. In addition, the antenna device according to the present invention can perform wideband transmission and reception using multi-resonance by arranging multiple radiators in multiple layers.

[0040] Rechargeable secondary batteries are widely used as power sources for wireless mobile devices. These batteries are also attracting attention as power sources for electric vehicles (EVs) and hybrid electric vehicles (HEVs), which are being proposed as solutions to address air pollution caused by conventional gasoline or diesel vehicles that use fossil fuels. Since these batteries alternate between charging and discharging, efficient control of their charge and discharge is essential to maintain optimal operating conditions and performance.

[0041] To this end, a battery pack is equipped with a battery management system (BMS), which manages the battery's condition and performance. The BMS measures battery current, voltage, temperature, etc. and records these data in memory to manage the battery. Circuit sections (112, 122, 132, 142) include various circuits for implementing this BMS.

[0042] FIG. 2a and FIG. 2b are exemplary diagrams showing the shape of a radiator and a feeding pattern formed on an antenna portion (111A) of a first printed circuit board (Layer 1) of an antenna device according to a first embodiment of the present invention. FIG. 2b is an enlarged view of portion 'A' shown in FIG. 2a.

[0043] In an antenna device according to the first embodiment, a feed pattern (210) and a first radiator (310) are arranged on an antenna portion (111A) of a first printed circuit board (Layer 1). The feed pattern (210) is arranged between the first radiator (310) and the circuit portion (112) of the first printed circuit board (Layer). The first radiator (310) is arranged in a form that surrounds a portion of the outer surface of the feed pattern (210). It can be seen that the total area of ​​the first radiator (310) is wider than the total area of ​​the feed pattern (210).

[0044] The power supply pattern (210) includes a starting portion (211), a middle portion (212), and an end portion (213), and the first radiator (310) includes a starting portion (311), a middle portion (312), and an end portion (313).

[0045] The starting part (211) of the power supply pattern (210) includes five parts (211-1, 211-2, 211-3, 211-4, 211-5) extending in the x-axis direction from the circuit board (112) as illustrated in FIG. 2B. The first part (211-1) is arranged with a length of L211-1 and a line width of W211-1. The second part (211-2) is arranged with a length of L211-2 and a line width of W211-2. The third part (211-3) is arranged with a length of L211-3 and a line width of W211-1. The fourth part (211-4) is widened to a length of L211-4 at a predetermined angle from the end part of the third part (211-3). The fifth section (211-5) is arranged from the end of the fourth section (211-4) to the end point (211e) of the beginning section (211) with a line width of W211-3 and a length of L211-5. The line width and length of each section are set in consideration of impedance matching.

[0046] The middle part (212) of the power supply pattern (210) is arranged in the y-axis direction with a line width of W212 and a length of L212. The end part (213) of the power supply pattern (210) extends from the middle part (212) of the power supply pattern (210) in the x-axis direction facing the circuit board (112) with a line width of W213 and a length of L213 from the end part starting point (213s).

[0047] The first radiator (310) includes a starting portion (311), a middle portion (312), and an ending portion (313). The starting portion (311) of the radiator (310) extends in the x-axis direction from one end of the circuit board (112) with a line width of W311 and a length of L311. The middle portion (312) of the radiator (310) extends in the y-axis direction from the starting point (312s) of the middle portion with a line width of W312 and a length of L312. The ending portion (313) of the radiator (310) extends from the middle portion (312) of the radiator (310) in the x-axis direction facing the circuit board (112) with a line width of W313 and a length of L313 from the starting point (313s) of the ending portion.

[0048] FIG. 3 is an exemplary diagram showing the shape of a radiator and a feeding pattern formed on an antenna portion (121) of a second printed circuit board (Layer 2) of an antenna device according to a first embodiment of the present invention. As illustrated in FIG. 3, only a second radiator (320) is arranged on the second antenna board (Layer 2) without a feeding pattern.

[0049] The second radiator (320) includes a starting portion (321), a middle portion (322), and an ending portion (323). The starting portion (321) of the second radiator (320) extends in the x-axis direction from one end of the circuit board (122) with a line width of W321 and a length of L321. The middle portion (322) of the second radiator (320) extends in the y-axis direction from the starting point (322s) of the middle portion with a line width of W322 and a length of L322. The ending portion (323) of the second radiator (320) extends in the x-axis direction facing the circuit board (122) from the middle portion (322) of the second radiator (320) with a line width of W323 and a length of L323 from the starting point (323s) of the ending portion. A portion of the second radiator (320) overlaps the first radiator (310) in the vertical direction (z-axis direction).

[0050] FIGS. 4A and 4B are exemplary diagrams showing an antenna portion (111B) including a radiator and a feeding pattern formed on a first printed circuit board of an antenna device according to a second embodiment of the present invention. FIG. 4B is an enlarged view of the 'B' portion illustrated in FIG. 4A.

[0051] A second embodiment of the present invention uses the same radiator (310) as in the first embodiment of FIG. 2A, but with a different shape of the feeder. The feeder (220) according to the second embodiment comprises a starting portion (221), a middle portion (222), and an ending portion (223).

[0052] The starting part (221) of the power supply (220) according to the second embodiment includes five parts (221-1, 221-2, 221-3, 221-4, 221-5) extending in the x-axis direction from the circuit board (112) as illustrated in FIG. 4B. The first part (221-1) is arranged with a length of L221-1 and a line width of W221-1. The second part (221-2) is arranged with a length of L221-2 and a line width of W221-2. The third part (221-3) is arranged with a length of L221-3 and a line width of W221-1. The fourth part (221-4) is widened to a length of L221-4 at a predetermined angle from the end part of the third part (221-3). The fifth section (221-5) is arranged from the end of the fourth section (221-4) to the end point (221e) of the beginning section (221) with a line width of W221-3 and a length of L221-5. The line width and length of each section are set in consideration of impedance matching.

[0053] The middle part (222) of the power supply pattern (220) according to the second embodiment is divided into first and second middle parts (222-1, 222-2) arranged parallel to the y-axis direction. The first middle part (222-1) is arranged in the y-axis direction with a line width of W222-1 and a length of L222-1. The second middle part (222-2) is arranged in the y-axis direction with a line width of W222-2 and a length of L222-2 from the second middle part starting point (222-2s). The length of the first middle part (222-1) is longer than that of the second middle part (222-2). The terminal portion (223) of the power supply pattern (220) according to the second embodiment extends from the terminal portion start point (223s) to the terminal portion end point (223e) on one side of the second middle portion (222-2) of the power supply pattern (220) in the x-axis direction facing the circuit board (112) with a length of L223 and a line width of w223.

[0054] FIG. 5a and FIG. 5b are exemplary views showing the shapes of a radiator and a feeding pattern formed on a first printed circuit board of an antenna device according to a third embodiment of the present invention.

[0055] A third embodiment of the present invention uses the same radiator (310) as in the first embodiment of FIG. 2A, but differs in the shape of the feeder from the first and second embodiments. The feeder (230) according to the third embodiment includes a starting portion (231), a middle portion (232), and an ending portion (233).

[0056] The starting part (231) of the power supply (230) according to the third embodiment comprises three parts (231-1, 231-2, 231-3) extending in the x-axis direction from the circuit board (112) as illustrated in FIG. 5B. The first part (231-1) of the starting part (231) of the power supply (230) is arranged with a length of L231-1 with a line width similar to that of the starting part of the second embodiment. The second part (231-2) is arranged with a length of L231-2 with a line width wider than that of the first part (231-1). The third part (231-3) is arranged with a length of L231-3 with the same line width as that of the first part (231-1).

[0057] The intermediate portion (232) of the feeder (230) according to the third embodiment includes first and second intermediate portions (232-1, 232-2) extending in the x-axis direction from the third portion (231-3) of the starting portion (231) in FIG. 5b. The first intermediate portion (232-1) includes two lines arranged in the y-axis with a length of L232-1-1 and a line width of W232-1, and a portion arranged in the middle with the same line width and a length of L232-1-2. The second intermediate portion (232-2) is arranged with a length of L232-2 and a line width of W232-2 from the starting point (232-2s) of the second intermediate portion. The end portion (233) of the feeder pattern (230) according to the third embodiment extends in the y-axis direction with a length of L233 and a line width of w233.

[0058] Figures 6a and 6b are exemplary diagrams showing the S parameters of a typical antenna and an antenna according to the present invention, measured using a network analyzer. Figure 6a shows the S parameters when the length of the antenna radiator is increased in a meander manner according to a typical technique and the reflection coefficient is adjusted using a matching circuit.

[0059] The S-parameter (Scattering parameter) is used to determine operating characteristics at different radio frequencies. For antennas, except for multi-port antennas, only S11 is output, as there are typically only input ports. Typically, S11 exhibits a sharp drop in a specific frequency band. A significant drop in S11 at the radiated frequency indicates that the input voltage at that frequency is not reflected and is radiated as much as possible.

[0060] As S11 decreases significantly, the Stationary Wave Ratio (SWR) also decreases, which means that the antenna's radiation characteristics are good. Depending on the width of the falling graph, it is divided into narrowband and wideband. Fig. 6b shows the S parameter in the case where the inductance (L) and capacitance (C) are increased by forming a feed pattern and a radiator on a printed circuit board as in the present invention, and a plurality of printed circuit boards are stacked to adjust the reflection coefficient. As shown, it can be seen that the width of the falling graph is indicated as a wideband.

[0061] Although the present invention has been described above with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below.

[0062] The mode for carrying out the invention has been sufficiently described in the above-mentioned “Best mode for carrying out the invention.”

[0063] The antenna device of the embodiment can be used in a wireless communication system, etc.

Claims

1. A plurality of printed circuit boards arranged in a vertically overlapping manner; A power supply pattern formed on at least one of the plurality of printed circuit boards to generate and radiate an electromagnetic wave signal; and An antenna device comprising at least one radiator that generates an electromagnetic wave signal by resonating in an indirect coupling manner and radiates the signal into the air while being spaced apart from the above-mentioned power supply pattern.

2. In the first paragraph, the radiator is an antenna device composed of a plurality of radiators arranged on different printed circuit boards.

3. In the second paragraph, an antenna device in which at least one of the plurality of radiators is arranged on a printed circuit board having the same power supply pattern.

4. In the third paragraph, an antenna device in which at least one of the plurality of radiators has a larger area than a feeding pattern arranged on the same printed circuit board.

5. An antenna device in the second paragraph, wherein the plurality of radiators have different lengths.

6. In the second paragraph, the antenna device wherein the plurality of radiators have different areas.

7. In the second paragraph, the plurality of radiators are an antenna device that resonates to transmit and receive signals of different frequency bands.

8. An antenna device in the second paragraph, wherein at least two of the plurality of radiators overlap in a vertical direction.

9. An antenna device in paragraph 8, wherein the overlapping area is 90% or more of the area of ​​one radiator.

10. An antenna device in which the power supply pattern is branched into a plurality of parts in the first paragraph.

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