KR20110096021A - Antenna using a reactive element - Google Patents

Abstract

PURPOSE: An antenna using a reactive element is provided to individually control high order resonant frequencies by selecting the connection points and components and size of the reactive element, thereby miniaturizing the antenna. CONSTITUTION: A radiation object(104) is electrically connected to an electricity supply point(102). A reactive element electrically connects the first point of the radiation object with the second point of the radiation object. The reactive element includes a first reactive element(106) and a second reactive element(108). The first reactive element is connected between the input terminal and the end terminal of the radiation object. The second reactive element is connected between the input terminal and the middle point of the radiation object.

Description

ANTENNA USING A REACTIVE ELEMENT

The present invention relates to an antenna using a reactive element, and more particularly, to an antenna for connecting the reactive element in parallel to the radiator so as to individually control higher resonant frequencies and the corresponding resonance bandwidth.

Recently, mobile communication terminals have been miniaturized and provided various communication services. Therefore, mobile communication terminals have built-in antennas capable of realizing multi-band and broadband.

In general, in order to realize multiband and wideband, the antenna diversifies its current path or uses parasitic radiating elements and the like.

In addition, in order to miniaturize the antenna, the radiator is implemented in a manner of increasing the electrical length of the antenna in a limited physical length, for example, meander, helical, or the like.

However, these methods have limitations in realizing multiband and wideband while miniaturizing the antenna.

In general, since the antenna implements a fundamental resonance frequency and a plurality of higher-order resonance frequencies, the antenna can be miniaturized while implementing multiple bands by using the higher-order resonance frequencies as a service band.

However, since the higher-order resonant frequencies are multiplied by the fundamental resonant frequency, the higher-order resonant frequencies cannot be utilized as service bands. Accordingly, there is a need for an antenna capable of realizing multiple bands and miniaturization by utilizing high-order resonant frequencies as a service band.

It is an object of the present invention to provide an antenna which can be miniaturized and utilize high-order resonant frequencies as the frequency of a service band.

Another object of the present invention is to provide an antenna capable of individually controlling higher resonant frequencies and corresponding resonant bandwidths.

In order to achieve the above object, an antenna according to an embodiment of the present invention is a feed point; A radiator electrically connected to the feed point; A first reactive element electrically connecting the first point and the second point of the radiator; And a second reactive element for electrically connecting a third point and a fourth point of the radiator. Here, the reactive elements are connected in parallel to the radiator, respectively, and the higher-order resonant frequencies of the antenna have nonlinear characteristics with respect to the fundamental resonant frequency due to the reactive elements.

Antenna according to another embodiment of the present invention is a feed point; A radiator electrically connected to the feed point; And a first reactive element electrically connecting the first point and the second point of the radiator. Here, the first reactive element is connected in parallel to the radiator, wherein at least one of the resonance frequency and the resonance bandwidth of the antenna is at a voltage difference between the first point and the second point and at each current intensity of the points. Depends.

Since the antenna of the present invention connects at least one reactive element to the radiator in parallel and utilizes higher-order resonant frequencies as the frequency of the service band, it is possible to implement multiple bands as one radiator, thereby miniaturizing the antenna. have.

In addition, the antenna has an advantage of individually controlling the higher resonant frequencies and the corresponding resonant bandwidth by considering components and sizes of the reactive elements and selecting connection points appropriately. Here, the connection points are selected in consideration of the voltage difference between them and their respective current strengths.

That is, the antenna can realize miniaturization and wideband by individually controlling higher-order resonant frequencies through selection of components and size of the reactive element and the connection points.

1 is a view showing an antenna using a reactive element according to an embodiment of the present invention.
2 is a diagram illustrating a voltage distribution and a current distribution of the radiator when the end of the radiator is opened according to an embodiment of the present invention.
3 is a diagram illustrating a voltage distribution and a current distribution of the radiator when the end of the radiator is shorted according to an embodiment of the present invention.
4 is a diagram illustrating an antenna that does not include a reactive element.
5 shows an antenna including one reactive element with a capacitive component.
6 illustrates a reactance curve.
7 is a diagram illustrating a standing wave ratio curve.
8 is a diagram illustrating a radiation pattern of an antenna using a reactive element according to an embodiment of the present invention.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. Like reference numerals are used for like elements in describing each drawing.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and are not construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing an antenna using a reactive element according to an embodiment of the present invention. 2 is a diagram illustrating a voltage distribution and a current distribution of the radiator when the end of the radiator is opened according to an embodiment of the present invention, and FIG. 3 is a short circuit of the end of the radiator according to an embodiment of the present invention. It is a figure which shows the voltage distribution and current distribution of the said radiator at the time.

Referring to FIG. 1A, the antenna of the present embodiment includes a ground 100, a feed point 102, a radiator 104, a first reactive element 106, and a second reactive element 108. ).

That is, the antenna of the present invention uses at least one reactive element 106 and 108 to individually adjust the higher order resonance frequencies and the corresponding resonance bandwidth as described below. Specifically, the antenna controls the component and size of the reactive elements 106 and 106 and connects the reactive elements 106 and 108 to a predetermined position of the radiator 104 to achieve the higher order resonant frequencies and resonances. Control bandwidth individually.

The feed point 102 is a point at which a predetermined power (RF signal) is supplied, and for example, a predetermined power is supplied through the RF transmission line under a state in which an RF transmission line such as a coaxial cable or the like is electrically connected to the feed point 102. It is fed to the point 102.

The radiator 104 is electrically connected to the feed point 102, and outputs a specific radiation pattern when a predetermined power is supplied through the feed point 102. Here, the length of the radiator 104 corresponds to the frequency band used, for example, may be implemented as a quarter length of the wavelength in the case of a monopole antenna. The radiator 102 is not limited to the structure of FIG. 1A, and may be implemented in various forms, such as a meander shape, a line shape, a spiral shape, and a helical shape. In addition, although only one radiator 104 is shown in FIG. 1, a plurality of radiators may be implemented.

According to one embodiment of the invention, the end of the radiator 104 may be open as shown in FIG. 1 or may be electrically connected to ground. However, as shown in FIGS. 2 and 3, the current and voltage distribution of the radiator 104 varies depending on whether the end of the radiator 104 is open or shorted. As a result, the resonant frequency and bandwidth characteristics of the antenna are changed, so that the user can open or short the end of the radiator 104 according to the design purpose. Detailed description thereof will be described later.

The first reactive element 106 is connected between the input end and the end of the radiator 104, for example as shown in FIG. 1A, ie, the radiator 104 as shown in FIG. 1B. Are connected in parallel.

The first reactive element 106 is formed of a capacitive element such as a capacitor, or an inductive element such as an inductor, and serves to vary the high-order resonance frequencies and the resonance bandwidth of the antenna. For example, when the first reactive element 106 is a capacitive element, the resonance frequency of the antenna is lowered, and when the first reactive element 106 is an inductive element, the resonance frequency of the antenna is increased. .

The second reactive element 108 is connected between the input terminal (the point at which the predetermined power is input) and the intermediate point of the radiator 104, for example, as shown in FIG. It is connected in parallel to the radiator 104 as shown. In addition, the second reactive element 108 is connected in parallel with the first reactive element 106.

This second reactive element 108 consists of a capacitive element or an inductive element. Here, when the second reactive element 108 is made of a capacitive element, the resonance frequency of the antenna is lowered, and when the second reactive element 108 is made of an inductive element, the resonance frequency of the antenna is increased.

These reactive elements 106 and 108 also change the resonant bandwidth of the antenna, but the resonant bandwidth is influenced not only by the reactive elements 106 and 108 but also by the spacing between the corresponding resonant frequency and the anti resonance point. Detailed description thereof will be described later.

According to an embodiment of the present invention, the first reactive element 106 may be formed in the form of a gap as a capacitive element, and the second reactive element 108 may be formed in the helical form as an inductive element. In this case, the first reactive element 106 may be formed of a chip capacitor, and the second reactive element 108 may be formed of a chip inductor.

According to one embodiment of the invention, the first reactive element 106 is connected between the input end and the end of the radiator 104, and the second reactive element 108 is between the input end and the intermediate point of the radiator 104. Can be connected to. As a result, the radiator 104, the predetermined inductor L and the predetermined capacitor C are connected in parallel with each other as shown in Fig. 1B. Here, the connection points of the respective reactive elements 106 and 108 are selected in consideration of the voltage difference between them and the current of the connection points. This is because the resonant frequencies and the resonant bandwidth are affected by the voltage difference between the connection points and the current strength of the connection points. In particular, when the voltage difference between the connection points of the reactive elements 106 and 108 is maximal and the current of the connection points is all zero, the resonance frequencies and the resonance bandwidth of the antenna are changed most.

When the voltage difference between the connection points of the reactive elements 106 and 108 and the current of the connection points change according to the selection of the connection points, the resonance frequencies and the resonance bandwidth of the antenna are variable as described below. Can be.

That is, perturbations of the resonant frequencies appear different depending on the component, size, and selection of connection points of the respective reactive elements 106 and 108. Thus, the user can greatly change a specific resonance frequency but not the other resonance frequency. For example, when a capacitor is used to implement a low frequency, the size of the antenna of the present invention may be smaller than that of a conventional antenna that implements the same low frequency, that is, the antenna of the present invention can be miniaturized. In addition, since the resonant bandwidth can be extended using the reactive elements 106 and 108, wideband implementation is possible.

In short, the resonant frequencies and resonant bandwidths of the antenna of the present invention vary depending on the component and size of the reactive element 106 or 108 connected in parallel to the radiator 104, the voltage difference between the connection points and the current strength of the connection points. Can be changed. In particular, since the high-order resonant frequencies may be individually controlled by using the reactive elements 106 and 108, the high-order resonant frequencies are controlled so as not to be multiplied with the fundamental resonant frequencies so that the higher-order resonant frequencies are used for the mobile communication terminal. It can be utilized as.

In the above, the antenna of the present invention includes two reactive elements 106 and 108, but may consist of one reactive element or of three or more reactive elements. That is, the number, components, sizes, connection methods, and the like of the reactive elements may be variously modified as long as the resonant frequencies and the resonance bandwidth of the antenna can be controlled using the reactive elements.

Hereinafter, a method of controlling the resonance frequency and the resonance bandwidth will be described in detail with reference to the accompanying drawings.

4 is a diagram illustrating an antenna that does not include a reactive element, and FIG. 5 is a diagram illustrating an antenna including one reactive element having a capacitive component. FIG. 6 illustrates a reactance curve, FIG. 7 illustrates a standing wave ratio curve, and FIG. 8 illustrates a radiation pattern of an antenna according to an exemplary embodiment of the present invention.

Hereinafter, a conventional first antenna 600 not including any reactive elements as shown in FIG. 4, and a second antenna 602 including only one reactive element of a capacitive component as shown in FIG. 5. 1, the reactance characteristics and standing wave ratio (VSWR) of the third antenna 604 including the first reactive element 106 of the capacitive component and the second reactive element 108 of the inductive component, as shown in FIG. 1. Let's look at the characteristics.

However, in the antenna 604 of FIG. 1, the first reactive element 106 is connected between the input end and the end of the radiator 104, and the second reactive element 108 is an intermediate point with the input end of the radiator 104. Assume that there is a connection between them. In addition, it is assumed that the voltage distribution and the current distribution of the radiator have a distribution as shown in FIG. In addition, the size of the radiator is set to 18 mm x 12.5 mm, the distance between the ground and the radiator is set to 5 mm, and it is assumed that the radiator is formed on the FR4 substrate (ε _r = 4.4, thickness 1.6 mm).

Referring to FIG. 6, antennas 600, 602 and 604 each implement a plurality of resonant frequencies (frequency at the point where reactance is zero). However, the first resonant frequency of about 1 kHz and the third resonant frequency of about 2 kHz may be used as the resonant frequency for the service, but the second resonant frequency of about 1.5 kHz may be used as the resonant frequency for the service. In practice, these are anti-resonant frequencies that cannot be used. That is, (2n-1) (n is an integer greater than or equal to 1) resonant frequencies are resonant frequencies that can actually be used, and 2n resonant frequencies are anti-resonant frequencies that cannot actually be used.

Hereinafter, the actual change of the resonance frequencies and the resonance bandwidth will be described based on the above conditions. However, since each of the antennas 600, 602, and 604 implements a plurality of resonant frequencies, the frequency change and the bandwidth change for each resonant frequency will be described.

First, the frequency change and the bandwidth change at the first resonant frequency will be described.

In the second antenna 602, a reactive element of capacitive component is connected to the input end and the end of the radiator. Referring to the voltage distribution curve 200a and the current distribution curve 202a in the structure of the second antenna 602, as shown in FIG. 2, there is a maximum voltage difference between the input terminal and the terminal of the radiator. The current at the input of the connection points of the radiator is not zero and the current at the termination is zero. As a result, the resonant frequencies and resonant bandwidth of the second antenna 602 differ from those of the first antenna 600 due to the reactive element.

In terms of the resonant frequency, the first resonant frequency of the first antenna 600 is about 0.85 Hz, while the first resonant frequency of the second antenna 602 is about 0.7 Hz, which is the first of the first antenna 600. It is confirmed that it is lower than the resonance frequency. This is because the reactive element has a capacitive component. That is, when the reactive element of the capacitive component is connected to the radiator in parallel, it is confirmed that the resonance frequency is lowered.

In view of the resonance bandwidth, the resonance bandwidth of the second antenna 602 is considerably narrower than the resonance bandwidth of the first antenna 600 as shown in FIG. 7. This is because the resonant bandwidth of the second antenna 602 is influenced by the distance from the reactive element of the capacitive component and the anti resonant frequency (second resonant frequency). Specifically, looking at the voltage distribution curve 200b and the current distribution curve 202b at the second resonant frequency, the voltage between the connection points is maximum and each current of the connection points is zero, so that the second resonance The frequency is changed to the maximum. However, since the reactive element has a capacitive component, the second resonant frequency moves in the low frequency direction. As a result, the spacing between the first and second resonant frequencies in the second antenna 602 is smaller than the spacing between the first and second resonant frequencies in the first antenna 600 and thus the second antenna. The resonance bandwidth of 602 narrowed. In other words, the bandwidth of the second antenna 602 becomes significantly narrower as the distance from the reactive element of the capacitive component and the anti-resonant frequency (second resonant frequency) becomes smaller.

Looking at the reactance curve of FIG. 6, the slope of the second antenna 602 is greater than that of the first antenna 600, that is, it is steep. In other words, the steeper the reactance curve, the narrower the bandwidth of the antenna.

In short, connecting a reactive element in parallel to a radiator changes the resonant frequencies and bandwidths of the antenna due to the voltage difference between the connection points of the reactive elements connected to the radiator and the current strength of the connection points.

As the reactive element is connected to the radiator in parallel to lower the resonance frequency, the antenna can be miniaturized. However, since the antenna can be narrow banded, it is necessary to implement a wide band as necessary.

In this case, the third antenna 604 of the present invention connects the second reactive element 108 having the inductive component to the radiator 104 in parallel to implement a wide resonance bandwidth. As a result, the third antenna 604 can be implemented in a wide range while being able to be miniaturized due to a low resonance frequency.

Specifically, when the second reactive element 108 is connected between the input terminal and the intermediate point of the radiator 104 in the third antenna 604, the voltage distribution curve 200a and the current distribution curve 202a of FIG. 2. As shown in FIG. 3, a predetermined voltage difference occurs between the input terminal and the intermediate point of the radiator 104, and a predetermined current exists at the connection points (the input terminal and the intermediate point), respectively. Thus, the second reactive element 108 causes the resonant frequency and resonant bandwidth of the third antenna 604 to differ from that of the second antenna 602.

In terms of the resonant frequency, the first resonant frequency of the third antenna 604 is about 1 kHz, which is higher than the first resonant frequency of the second antenna 602. That is, when the second reactive element 108 of the inductive component is connected to the radiator 104 in parallel, it is confirmed that the resonance frequency increases.

In view of the resonance bandwidth, the resonance bandwidth of the third antenna 604 is wider than the resonance bandwidth of the second antenna 602 as shown in FIG. 7. This is because the distance from the second reactive element 108 and the anti resonant frequency (second resonant frequency) is affected. However, as shown in FIG. 6, the interval between the first resonance frequency and the second resonance frequency in the third antenna 604 is the interval between the first resonance frequency and the second resonance frequency in the second antenna 602. In this case, the bandwidth of the third antenna 604 is widened by the influence of the second reactive element 108 rather than by the distance from the anti-resonance frequency (second resonance frequency).

In this case, the reactance curve of the third antenna 604 is formed less steeply than the reactance curve of the second antenna 602.

In short, the antenna 604 of the present invention can implement a wideband using the second reactive element 108 of the inductive component while lowering the first resonant frequency using the first reactive element 106 of the capacitive component. Can be.

In the above, the resonant frequency of the third antenna 604 is higher than the resonant frequency of the first antenna 600, and the resonant bandwidth of the third antenna 604 is wider than the resonant bandwidth of the first antenna 600. However, by properly adjusting the size of the second reactive element 108 of the inductive component, the first resonant frequency of the third antenna 604 may be adjusted to the first resonant frequency of the first antenna 600 and the second antenna 602. It is also possible to design a frequency between the first resonant frequency of the, and to implement the resonant bandwidth of the third antenna 604 narrower than the resonant bandwidth of the first antenna 600 and wider than the resonant bandwidth of the second antenna (602).

Next, the frequency change and the bandwidth change at the second resonant frequency will be described.

The second resonant frequency of the first antenna 600 is about 1.7 Hz, while the second resonant frequency of the second antenna 602 is about 1.3 Hz, and the second resonant frequency of the third antenna 604 is about 1.5 Hz. . That is, it is confirmed that the resonance frequency of the antenna is lowered by using the reactive element of the capacitive component, and that the resonance frequency of the antenna is increased by using the reactive element of the inductive component.

Referring to the voltage distribution curve 200b and the current distribution curve 202b of FIG. 2 at the second resonant frequency, a predetermined voltage difference exists between the connection points (the input terminal and the intermediate point) of the radiator, and the current at the input terminal is 0 and the middle. The current at the point has a certain intensity. Also, as shown in FIG. 2, the voltage difference at the second resonant frequency is greater than at the first resonant frequency, and the current at the input terminal is zero at the second resonant frequency. Thus, the resonant frequency of the antenna at the second resonant frequency varies more than at the first resonant frequency. As a result, the spacing between the first resonant frequency at the second antenna 602 and the second resonant frequency as the anti resonant frequency is formed smaller than the spacing between the first and second resonant frequencies of the first antenna 600. do. Therefore, the resonance bandwidth of the second antenna 602 is narrower than the resonance bandwidth of the first antenna 600 at the first resonance frequency.

Next, the frequency change and the bandwidth change at the third resonant frequency will be described.

In the second antenna 602, the reactive element of the capacitive component is connected to the input terminal and the end of the radiator. In this case, as shown in the voltage distribution curve 200c and the current distribution curve 202c of FIG. A predetermined voltage difference occurs between the connection points (input and end), the current at the input has a certain intensity and the current at the termination is zero. Thus, the resonant frequency and bandwidth of the second antenna 602 is different from that of the first antenna 600.

In terms of the resonant frequency, the third resonant frequency of the first antenna 600 is about 2.55 kHz, whereas the third resonant frequency of the second antenna 602 is about 2.15 kHz, which is the third of the first antenna 600. It is confirmed that it is lower than the resonance frequency. This is because the reactive element has a capacitive component.

In view of the resonance bandwidth, the resonance bandwidth of the second antenna 602 is almost similar to the resonance bandwidth of the first antenna 600 as shown in FIG. 7. This is because the change in the resonance bandwidth due to the reactive element and the change in the resonance bandwidth due to the change in the interval between the anti-resonant frequency (fourth resonant frequency) and the third resonant frequency almost cancel each other out.

Specifically, as shown in the voltage distribution curve 200d and the current distribution curve 200d of FIG. 2, since the voltage difference between the input terminal and the terminal of the radiator is zero at the fourth resonant frequency, The fourth resonant frequency is not changed from the fourth resonant frequency of the first antenna 600. As a result, the spacing between the third and fourth resonant frequencies of the second antenna 602 is farther than the spacing between the third and fourth resonant frequencies of the first antenna 600, and thus the third The resonance bandwidth of the second antenna 602 may be wider at the resonant frequency, but may not be substantially widened due to the reactive element.

That is, while the third resonant frequency of the second antenna 602 is lowered, its bandwidth can be maintained or widened. Accordingly, the second antenna 602 can implement a wider bandwidth while being smaller than the first antenna 600.

Looking at the third antenna 604, the second reactive element 108 is connected between the input terminal and the intermediate point of the radiator 104. In this case, as shown in the voltage distribution curve 200c and the current distribution curve 202c of FIG. 2, the currents at the input terminal and the intermediate point of the radiator 104 are respectively maximized, and thus the third antenna 604 The third resonant frequency is hardly changed from the third resonant frequency of the second antenna 602 so that it is almost similar.

That is, the third resonant frequency of the third antenna 604 is about 2.15 Hz, which is almost similar to the third resonant frequency of the second antenna 602.

In terms of resonant bandwidth, the resonant bandwidth of the third antenna 604 at the third resonant frequency should be similar to that of the second antenna 602, but can be substantially widened. This is due to the interval between the anti resonant frequency (fourth resonant frequency) and the third resonant frequency. Specifically, as shown in the voltage distribution curve 200d and the current distribution curve 200d of FIG. 2, the voltage difference between the connection points (the input terminal and the intermediate point) of the radiator 104 becomes the maximum and the Since the currents are each zero, the maximum perturbation occurs. That is, the fourth resonant frequency is increased to the maximum, so that the interval between the fourth and third resonant frequencies of the third antenna 604 is the fourth and third resonant frequencies of the second antenna 602. It will be farther apart. As a result, the resonant bandwidth of the third antenna 604 is widened, which can be confirmed by the fact that the reactance curve of the third antenna 604 is gentler than the reactance curve of the second antenna 602 at the third resonant frequency.

In short, the antenna of the present invention uses at least one reactive element, and can individually adjust the resonant frequencies and the resonant bandwidth by appropriately selecting the components and size of the reactive element and the points to which the reactive element is connected. . In particular, since the antenna may nonlinearly change the higher-order resonant frequencies from the fundamental resonant frequency, the antenna may implement a multi-band using the fundamental and the higher-order resonant frequencies. In addition, the reactive device may be appropriately designed to implement broadband.

That is, the miniaturization of the antenna is possible by using the reactive element, and multiband and wideband can be realized. In particular, since the user can arbitrarily adjust the resonant frequencies and bandwidth, it is possible to easily meet the specifications of the various antennas can be increased the utilization of the antenna.

In the above, only the case in which the end of the radiator is opened is described, but it operates similarly to the case in which the end of the radiator is short-circuited. This will be omitted.

According to another embodiment of the present invention, the first reactive element 106 may be implemented as an inductive component and the second reactive element 108 may be implemented as a capacitive component. That is, the components and sizes of the reactive elements 106 and 108 may vary in accordance with the designer's purpose.

8 is a diagram illustrating a radiation pattern of an antenna using a reactive element according to an embodiment of the present invention. Specifically, FIG. 8 (A) shows the radiation pattern in the 1.05 Hz band, and FIG. 8 (B) shows the radiation pattern in the 2.48 Hz band.

As shown in Fig. 8, the antenna of this embodiment forms an omnidirectional radiation pattern, i.e., has a radiation pattern similar to that of the monopole antenna. Therefore, the antenna of the present embodiment can be used embedded in the mobile communication terminal.

The embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art having ordinary knowledge of the present invention may make various modifications, changes, and additions within the spirit and scope of the present invention. Should be considered to be within the scope of the following claims.

Claims (3)

Feed point;
A radiator electrically connected to the feed point; And
Including a reactive element for electrically connecting the first point and the second point of the radiator,
And the reactive element is connected in parallel to the radiator, and the connection point of the reactive element is a point at which the voltage difference between the connection points is maximum in a specific resonance mode. Feed point;
A radiator electrically connected to the feed point; And
Including a reactive element for electrically connecting the first point and the second point of the radiator,
And the reactive element is connected in parallel to the radiator, and at least one of the connection points of the reactive element is a point at which the current intensity is zero in a specific resonance mode. Feed point;
A radiator electrically connected to the feed point; And
Including a reactive element for electrically connecting the first point and the second point of the radiator,
The reactive element is connected to at least one of the point where the current intensity is zero or the point where the voltage difference is maximum in the specific resonance mode so that the resonance frequency in the specific resonance mode is not linearly related to the fundamental resonance frequency. An antenna using a reactive element, characterized in that the.

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