KR100857284B1 - RF Antenna Using Dielectric Resonator - Google Patents

Abstract

The present invention relates to an RF antenna using a dielectric resonator, the antenna according to the present invention includes a dielectric resonator for resonating a signal of a predetermined frequency band; And a resonant frequency shifting circuit coupled to the dielectric resonator to shift a frequency resonating in the dielectric resonator, wherein the dielectric resonator has a resonance characteristic at a frequency higher than a frequency band to be received. The resonance characteristic of the dielectric resonator in the preset frequency band is changed to resonate in a low frequency band.

Resonator, dielectric, frequency shift

Description

RF Antenna Using Dielectric Resonator

1 is a perspective view showing a general antenna for receiving DMB.

Figure 2 is a block diagram showing the configuration of an RF receiving antenna according to an embodiment of the present invention.

3 is a diagram showing the configuration of a resonant frequency shifting circuit according to a preferred embodiment of the present invention.

4 is a diagram illustrating a configuration of a resonance frequency shifting circuit according to another embodiment of the present invention.

FIG. 5 is a diagram illustrating a PCB in which a resonance frequency shifting circuit shown in FIG. 4 is coupled to a dielectric resonator; FIG.

6 is a diagram illustrating a configuration of a resonance frequency shifting circuit according to another embodiment of the present invention.

7 is a diagram illustrating a configuration of a resonance frequency shifting circuit according to another embodiment of the present invention.

FIG. 8 is a view illustrating a PCB in which a resonance frequency shifting circuit shown in FIG. 7 is coupled to a dielectric resonator.

9 shows waveforms when the resonance frequency shifting circuit is not coupled to the dielectric resonator and waveforms when the resonance frequency shifting circuit is coupled to the dielectric resonator;

10 illustrates the shape of a dielectric resonator in accordance with a preferred embodiment of the present invention.

FIG. 11 is a diagram illustrating a result of sensitivity measurement on a specific CDMA channel in a CDMA frequency band for an antenna according to a preferred embodiment of the present invention. FIG.

12 is a view showing a measurement result of the radiation power of the antenna according to the preferred embodiment of the present invention.

FIG. 13 is a diagram illustrating a result of sensitivity measurement on a channel of a CDMA frequency band as shown in FIG. 11 with respect to a general mobile phone antenna. FIG.

FIG. 14 is a view showing radiated power measurement results in a channel of a CDMA frequency band as shown in FIG. 12 for a general mobile phone antenna; FIG.

15 is a graph schematically illustrating the results of sensitivity measurement of FIG. 11.

FIG. 16 is a graph illustrating the radiation power measurement result of FIG. 12. FIG.

FIG. 17 is a graph illustrating the sensitivity measurement result of FIG. 13. FIG.

18 is a graph schematically illustrating the radiation power measurement result of FIG. 14.

The present invention relates to an antenna for receiving an RF signal, and more particularly, to an antenna used in a portable terminal and a small device using a dielectric resonator.

The development of wireless communication technology is increasing the use of wireless communication devices. In recent years, the use rate of mobile communication phones is very high compared to the use rate of wired communication phones, and the types of wireless communication devices have been diversified due to the introduction of technologies such as wireless LAN and DMB as well as mobile communication phones.

These wireless communication devices are all equipped with antennas for receiving RF signals. These antennas have various forms according to the frequency bands used by the corresponding wireless communication device, and the size of the antenna depends on the frequency band used by the wireless communication device.

Most wireless communication devices are required to be portable terminals or small devices, but the size of an antenna for receiving RF signals has been one of the important factors that hinders the miniaturization of portable terminals or wireless communication devices.

In particular, when the frequency band is a relatively low frequency band compared to other communication frequencies, the size of the antenna has been a major obstacle to the miniaturization of the device, mobile phones, DMB receivers, wireless LAN communication devices, etc. may be a representative example.

1 is a diagram illustrating a perspective view of an antenna provided in a general portable terminal.

/4 값에 의해 결정된다. 특히 저주파 대역인 지상파 DMB 주파수 대역인 170MHz의 주파수를 사용하는 경우 정상적인 안테나 길이는 30cm가 되며, 이러한 안테나의 길이는 장치를 소형화하는데 상당한 장애가 될 수밖에 없었다. As shown in FIG. 1, an antenna used in a portable terminal is a dipole type antenna that extends up and down, and it is quite inconvenient to use because the antenna has to be pulled out long when watching a broadcast. The length of the antenna is proportional to the wavelength, and typically the length of the antenna is the wavelength divided by 4

Determined by the / 4 value. In particular, when the low frequency band of the terrestrial DMB frequency band of 170MHz is used, the normal antenna length is 30cm, and the length of the antenna is a significant obstacle to miniaturizing the device.

In order to solve the problems of the prior art as described above, the present invention is to propose a small antenna that can be used in the low frequency band.

Another object of the present invention is to propose an RF receiving antenna having a smaller size than a conventional antenna even in a relatively low frequency band using a dielectric resonator.

In order to achieve the above object, according to an aspect of the present invention, a dielectric resonator for resonating a signal of a predetermined frequency band; And a resonant frequency shifting circuit coupled to the dielectric resonator to shift a frequency resonating in the dielectric resonator, wherein the dielectric resonator has a resonance characteristic at a frequency higher than a frequency band to be received. An RF antenna using a dielectric resonator is provided, wherein the resonance characteristic of the dielectric resonator is changed to resonate at a low frequency band.

The resonant frequency shifting circuit may be connected in parallel to the dielectric resonator or in series.

The RF antenna using the dielectric resonator is coupled with an internal circuit that performs preset signal processing on the output signal.

The resonant frequency shifting circuit may include a combination of at least one inductor and a capacitor.

The resonant frequency shifting circuit shifts the resonant frequency of the dielectric resonator using a combination of inductors and capacitors coupled in parallel.

The resonant frequency shifting circuit includes: a first inductor connected to one end of the dielectric resonator; A second inductor connected in series between the first inductor and the other end of the dielectric resonator; A first capacitor connected in parallel with the second inductor; And a second capacitor connected in series between the other end of the dielectric resonator and ground.

The resonant frequency shifting circuit includes: a first inductor connected in series with the dielectric resonator; A second inductor connected in series with the first inductor; A first capacitor connected in parallel with the second inductor; And a second capacitor connected in series with the second inductor.

The resonant frequency shifting circuit may be formed on a PCB, and the PCB on which the resonant frequency circuit is formed may be coupled to the dielectric resonator.

According to another aspect of the invention, a dielectric resonator for resonating a signal of a predetermined frequency band; A resonant frequency shifting circuit coupled to the dielectric resonator to shift a frequency resonating in the dielectric resonator, wherein the resonant frequency shifting circuit is formed on a PCB, the PCB is coupled to the dielectric resonator, and the resonant frequency shifting circuit Is provided with an RF antenna using a dielectric resonator, characterized in that consisting of a combination of at least one inductor and capacitor.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the RF antenna using a dielectric known according to the present invention.

2 is a block diagram illustrating a configuration of an RF receiving antenna according to an exemplary embodiment of the present invention.

2, an RF antenna using a dielectric resonator according to an embodiment of the present invention may include a dielectric resonator 200 and a resonant frequency shifting circuit 202.

The present invention proposes an antenna configuration for receiving an RF signal using a dielectric resonator without having an antenna radiating element such as a dipole.

The dielectric resonator 200 functions to resonate the received RF signal at a specific frequency. The resonance frequency in the dielectric resonator 200 is determined by the shape and size of the dielectric resonator. The shape of the dielectric resonator is generally divided into a cuboid type and a disc type. In addition, the size of the dielectric resonator depends on the frequency of resonation.

According to a preferred embodiment of the present invention, the dielectric resonator used in the antenna according to the present invention is a dielectric resonator which resonates higher than the frequency to be received by the antenna.

The size of the dielectric resonator, like the antenna, is also inversely proportional to frequency. For example, a dielectric resonator having a resonance frequency of 1.8 GHz is smaller in size than a dielectric resonator having a resonance frequency of 900 MHz. In order to minimize the size of the dielectric resonator, the dielectric resonator itself uses a dielectric resonator having a resonant frequency larger than the frequency to be received through the antenna.

At this time, the dielectric resonator resonating the 1.8GHz band has a size of about 3mm wide, 3mm long and 6mm high in the case of a rectangular-shaped dielectric resonator, and the dielectric resonator resonating the 900MHz band is about 6mm wide, 6mm long and 8mmm high. Has the size of. That is, in the present invention, when receiving the RF signal of 900MHz band is to use a dielectric resonator of 1.8GHz band smaller than the 900MHz band.

10 is a view showing the shape of the dielectric resonator according to an embodiment of the present invention.

As shown in FIG. 10, the dielectric resonator may have a rectangular parallelepiped shape, and both sides 1000 and 1002 of the rectangular parallelepiped have an open structure. The strip line may be coupled to another non-open side of the dielectric resonator to deliver a signal resonant in the dielectric resonator.

In order to transmit a signal resonating in the dielectric resonator, unlike FIG. 10, a cable for signal transmission may be installed on the open sides 1000 and 1002 of the dielectric resonator.

Resonant frequency shifting circuit 202 is coupled to dielectric resonator 200. The resonant frequency shifting circuit 202 functions to shift the resonant frequency of the coupled dielectric resonator. For example, the dielectric resonator itself is a resonator having a shape and size resonating at 1.8 GHz, but the resonant frequency shifting circuit 200 shifts the resonant frequency of the dielectric resonator to the 900 MHz band. The resonant frequency shifting circuit 202 is a key component of the present invention, which enables a small size high frequency dielectric resonator to receive a low frequency signal.

2 illustrates a case where a resonant frequency shifting circuit is coupled in series with a dielectric resonator, it will be apparent to those skilled in the art that the resonant frequency shifting circuit may be connected in parallel.

According to a preferred embodiment of the present invention, the resonant frequency shifting circuit includes an inductor element and a capacitor element. The resonant frequency shifting circuit makes it possible to resonate the frequencies in the low frequency band by shifting the resonant frequency of the high frequency dielectric resonator by the combination of the inductor element and the capacitor element described above.

According to an embodiment of the present invention, a resonant frequency shifting circuit including an inductor element and a capacitor element is formed on a PCB board, and the antenna according to the present invention is implemented in a form in which a PCB board on which the resonant frequency shifting circuit is formed is coupled to a dielectric resonator. Could be. Of course, the resonant frequency shifting circuit of the present invention is not limited to being formed on a PCB board, and it will be apparent to those skilled in the art that the present invention can have various other forms. The configuration of the resonant frequency shifting circuit will be described in detail with reference to the following drawings.

3 is a diagram illustrating a configuration of a resonance frequency shifting circuit according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the resonant frequency shifting circuit may be coupled in parallel to both ends of the dielectric resonator, and includes one inductor L1 and one capacitor C1. The resonant frequency shifting circuit shifts the resonant frequency of the dielectric resonator corresponding to the values of the inductor L1 and the capacitor C1. Capacitors and inductors change the resonant frequency through the dielectric resonator through the available frequency determination characteristics of the inductor and capacitor.

For example, in order to shift the resonant frequency of the dielectric resonator having the resonant frequency of 1.8 GHz to the 900 MHz band, the value of the capacitor C1 may be 120 pF, and the value of the inductor L1 may be 33 μH.

4 is a diagram illustrating a configuration of a resonance frequency shifting circuit according to another embodiment of the present invention.

Referring to FIG. 4, a resonant frequency shifting circuit according to another embodiment of the present invention includes a first inductor L1 connected to a first end of a dielectric resonator, a second inductor L2 connected to a second end of a dielectric resonator, and A first capacitor C1 connected in parallel to a second inductor and a second capacitor C2 connected to the second inductor and ground may be included.

Here, the output signal converted from the resonance frequency is a signal applied to the second inductor L2 and the first capacitor C1, and the signal applied to the second inductor is transmitted to an internal circuit connected to the antenna. The internal circuit receives the RF signal from the antenna of the present invention, which is composed of a dielectric resonator and a resonant frequency shifting circuit, and performs general signal processing such as signal conversion and frequency modulation / demodulation.

3 and 4 illustrate an embodiment in which the number of inductors and capacitors is one or two, it will be apparent to those skilled in the art that the number of inductors and capacitors may vary as needed.

FIG. 5 is a diagram illustrating a PCB in which a resonance frequency shifting circuit shown in FIG. 4 is coupled to a dielectric resonator.

That is, FIG. 5 illustrates a PCB pattern having a circuit as shown in FIG. 4 and a dielectric resonator 500 coupled thereto.

In FIG. 5, the first inductor L1 and the second inductor L2 may be formed in the form of a general PCB pattern. Alternatively, a chip inductor may be used as the first inductor L1 and the second inductor L2.

In addition, the chip capacitor may be coupled to the PCB pattern by the first capacitor C1 and the second capacitor C2.

In FIG. 5, the first capacitor C1 is connected to both sides of the second inductor pattern in order to be connected in parallel with the second inductor L2, and the second capacitor C2 has one end of the first inductor L1. It is connected in series with the patterned part, and the other end is connected with the ground.

The PCB is provided with pads 504 across the dielectric resonator for coupling the dielectric resonator thereon, and the dielectric resonator is fixed to the PCB by the pad. The PCB shown in FIG. 5 may have a size of about 5 mm in width and 9 mm in length.

5 illustrates a PCB pattern in which strip lines are coupled to both sides of the dielectric resonator, but as described above, the resonant frequency shifting circuit may be coupled while the cable is connected to the open portion of the dielectric resonator.

6 is a diagram illustrating a configuration of a resonance frequency shifting circuit according to another embodiment of the present invention.

Referring to FIG. 6, the resonant frequency shifting circuit may be coupled in series to one end of the dielectric resonator and includes one inductor L1 and one capacitor C1. As shown in FIG. 6, one inductor L1 and one capacitor C1 are connected in parallel with each other, and the resonant frequency shifting circuit corresponds to the value of the inductor L1 and the capacitor C1 of the dielectric resonator. Shift the resonance frequency.

FIG. 3 illustrates a case in which a resonant frequency shifting circuit composed of one inductor and a capacitor is coupled in parallel to a dielectric resonator. As shown in FIG. 6, a resonant frequency shifting circuit composed of one inductor and a capacitor is connected in series with a dielectric resonator. Even in this case, the resonance frequency shifting circuit may operate. In this case, the values of the capacitor C1 and the inductor are basically the same as those connected in parallel. However, changes in PCB patterns can cause differences in values.

7 is a diagram illustrating a configuration of a resonance frequency shifting circuit according to another embodiment of the present invention.

Referring to FIG. 7, a resonant frequency shifting circuit according to another embodiment of the present invention includes a first inductor L1 connected to one end of a dielectric resonator and a second inductor L2 connected in series to the first inductor. The first capacitor C1 may be connected in parallel with the second inductor, and the second capacitor C2 may be connected in series with the second inductor.

FIG. 7 illustrates a configuration in which the resonant frequency shifting circuit is connected in series to the dielectric resonator, and as shown in FIG. 7, the resonant frequency shifting circuit is connected to only one end of the dielectric resonator.

Capacitors and inductors constituting the dielectric resonant circuit in FIG. 7 also shift the resonant frequency in the dielectric resonator correspondingly.

In the resonant frequency shifting circuit of FIG. 7, the output signal is a signal across the second inductor L2, and the signal is transmitted to the internal circuit. The internal circuit receives the RF signal from the antenna of the present invention, which is composed of a dielectric resonator and a resonant frequency shifting circuit, and performs general signal processing such as signal conversion and frequency modulation / demodulation.

FIG. 8 is a diagram illustrating a PCB in which a resonance frequency shifting circuit illustrated in FIG. 7 is coupled to a dielectric resonator.

FIG. 8 illustrates a PCB pattern in which a circuit as shown in FIG. 7 is formed and a dielectric resonator 800 coupled thereto.

In FIG. 8, the first inductor L1 and the second inductor L2 are generally formed in the form of a PCB pattern. Of course, as described above, the first inductor L1 and the second inductor L2 may be implemented in the form of a chip inductor. In addition, a conventional chip capacitor may be used as the first capacitor C1 and the second capacitor C2, and may be formed in a form that is coupled to a part of the PCB pattern.

In FIG. 8, the first capacitor C1 is connected to both sides of the second inductor pattern in order to be connected in parallel with the second inductor L2, and the second capacitor C2 has one end of the second inductor L1. It is connected in series with the patterned part.

The PCB includes a pad 804 for coupling the dielectric resonator thereon, and the dielectric resonator is fixed to the PCB by the pad.

8 shows a PCB pattern in which a strip line is coupled to one side of the dielectric resonator, but as described above, the resonant frequency shifting circuit may be coupled while the cable is connected to the open portion of the dielectric resonator.

9 shows waveforms when the resonance frequency shifting circuit is not coupled to the dielectric resonator and waveforms when the resonance frequency shifting circuit is coupled to the dielectric resonator.

When a typical 1.8 GHz dielectric resonator is used as an antenna, the output waveform of the dielectric resonator shows a peak value at 1.8 GHz as shown in FIG. 9. However, when the resonant frequency shifting circuit of FIG. 3 to FIG. 8 is coupled to the dielectric resonator, the output waveform of the dielectric resonator has a peak value of 900 MHz band which is lower than 1.8 GHz band.

By using the same principle, an antenna can be used because the signal of the 900MHz band where the CDMA mobile phone is mainly used as well as the terrestrial DMB receiver using the signal of the 200MHz band are relatively small. For example, an antenna may be implemented to receive a terrestrial DMB signal in a 200 MHz band by combining a dielectric resonator for resonating a frequency in a 900 MHz band with a resonant frequency shifting circuit.

Hereinafter, the results of experimenting with the RF signal reception performance of the dielectric resonator according to the preferred embodiment of the present invention will be described. In order to test the reception performance of the dielectric resonator according to the preferred embodiment of the present invention, the test was performed for the case of receiving the 900 MHz band. The 900 MHz band is a frequency band in which a CDMA mobile phone is used, and the antenna performance according to the present invention is compared with the reception performance of a general mobile phone antenna.

The antenna of the preferred embodiment of the present invention used for testing was a rectangular parallelepiped dielectric resonator having a width and height. In addition, a resonant frequency shifting circuit of the type shown in FIG. 3 was used as the resonant frequency shifting circuit, the capacitor value was 120 pF, and the value of the inductor L1 was 33 μH.

In addition, the general mobile phone antenna compared to the antenna of the preferred embodiment of the present invention is a general dipole antenna, the antenna having a diameter of 4mm ~ 30mm in length.

Two indices were tested to test the reception performance of the antenna. One index was Total Isotropic Sensitivity (TIS) and the other was Total Radiation Power (TRP).

When the TIS was measured, the reception performance of the equipment was measured using the bit error rate or the frame erasure rate. The TIS test feature uses the appropriate digital error rate to evaluate the effective radiation reception sensitivity at the measurement location in each space. By analyzing the measurement data obtained by moving the space, the reception performance of the device is characterized in three dimensions, and the reception sensitivity of the device is evaluated using the data obtained by converting the angle by 30 degrees in theta and pi axis directions. The total isotropic sensitivity is calculated by integrating all sensitivity values.

FIG. 11 illustrates a result of sensitivity measurement on a specific CDMA channel in a CDMA frequency band with respect to an antenna according to an exemplary embodiment of the present invention. As shown in FIG. 11, sensitivity was measured at each 30 degree interval.

The total isotropic sensitivity, incorporating all sensitivity, was measured at 94.99 dBm, and the results on the other two channels were 94.59 dBm and 93.24 dBm.

15 is a graph schematically illustrating the sensitivity measurement result of FIG. 11.

FIG. 13 is a diagram illustrating a result of sensitivity measurement on a channel of a CDMA frequency band as shown in FIG. 11 with respect to a general mobile phone antenna. Sensitivity was measured at intervals of 30 degrees in the same manner as in FIG. 11.

The total isotropic sensitivity incorporating the sensitivity of FIG. 13 was measured at 96.84 dBm. The total isotropic sensitivity was also measured in the other two channels for the general mobile phone antenna. The measurement results were 97.73dBm and 96.55dBm, respectively.

17 is a graph schematically illustrating the sensitivity measurement result of FIG. 13.

Comparing the measurement results of the total isotropic sensitivity with the general mobile phone antenna, the antenna according to the preferred embodiment of the present invention has a slightly lower total isotropic sensitivity than the general mobile phone antenna. It became.

Total radiated power (TRP) was measured by sampling the radiated transmit power at a convincing location surrounding the device to evaluate the RF radiation performance of the device. Theta and Pi were changed at intervals of 30 degrees in the axial direction, and the data thus obtained were used to evaluate the radiated power. The total radiated power is measured by integrating all measured power values.

12 is a diagram illustrating a measurement result of the radiated power of the antenna according to the preferred embodiment of the present invention. As shown in FIG. 12, the radiated power was measured at 30 degree intervals in the axial direction.

The total radiated power incorporating the radiated power was measured at 17.83 dBm. The total radiated power measurements on the other two channels were 18.07 dBm and 17.72 dBm.

FIG. 16 is a graph illustrating the radiation power measurement result of FIG. 12.

FIG. 14 is a diagram illustrating radiated power measurement results in a channel of the CDMA frequency band shown in FIG. 12 with respect to a general mobile phone antenna.

FIG. 14 is a diagram illustrating radiated power measurement results in a channel of a CDMA frequency band as shown in FIG. 12 with respect to a typical cellular phone antenna. The sensitivity was measured at 30 degree intervals in the same manner as in FIG. 12.

The total radiation power incorporating the radiation power of FIG. 14 was measured at 17.11 dBm. The total isotropic sensitivity was also measured in the other two channels for the general mobile phone antenna. The measurement results were 18.08 dBm and 17.22 dBm, respectively.

18 is a graph schematically illustrating the radiation power measurement result of FIG. 14.

Comparing the total radiated power measurement results with the general mobile phone antenna, the total radiated power of the antenna according to the preferred embodiment of the present invention was measured to be slightly higher than the total radiated power of the mobile phone antenna. It was confirmed that there is no significant difference in terms of the size of the cell phone antenna and the total radiated power.

As such, the present invention, which can significantly reduce the size of the antenna by utilizing a dielectric known device as an antenna and shifting the resonance frequency of the dielectric resonator, may be used in various apparatuses. The present invention can greatly contribute to the miniaturization of cellular terminals using cellular or PCS as well as relatively low frequency communication terminal devices such as DMB terminals and DMB USB drivers.

In addition, if the general dipole antenna has a low Q value and the length of the antenna is not correctly determined, the resonance point is distorted, thereby significantly reducing the gain of the antenna. However, according to the present invention, it is possible to have a higher Q value. It can have a wider reception bandwidth.

As described above, according to the preferred embodiment of the present invention, an antenna having a smaller size than a conventional antenna may be used even in a low frequency band. Such an antenna according to a preferred embodiment of the present invention can greatly contribute to miniaturization of various types of portable devices such as mobile phones and terrestrial DMB receivers.

Claims (11)

A dielectric resonator for resonating a signal of a preset frequency band; A resonance frequency shifting circuit coupled to the dielectric resonator to shift a frequency resonating in the dielectric resonator, The dielectric resonator has a resonance characteristic at a frequency higher than a frequency band to be received, and the resonance frequency shifting circuit changes the resonance characteristic at the preset frequency band of the dielectric resonator to resonate at a low frequency band. RF antenna using a dielectric resonator. The method of claim 1, And the resonant frequency shifting circuit is connected in parallel to the dielectric resonator. The method of claim 1, And the resonance frequency shifting circuit is connected in series with the dielectric resonator. The method of claim 1, The RF antenna using the dielectric resonator is coupled to the internal circuit for performing a predetermined signal processing for the output signal RF antenna using a dielectric resonator. The method according to claim 2 or 3, The resonance frequency shifting circuit is an RF antenna using a dielectric resonator, characterized in that consisting of at least one combination consisting of an inductor and a capacitor. The method of claim 5, And the resonant frequency shifting circuit shifts the resonant frequency of the dielectric resonator using a combination of inductors and capacitors coupled in parallel. The method of claim 2, The resonance frequency transition circuit, A first inductor connected to one end of the dielectric resonator; A second inductor connected in series between the first inductor and the other end of the dielectric resonator; A first capacitor connected in parallel with the second inductor; And And a second capacitor connected in series between the other end of the dielectric resonator and ground. The method of claim 3, The resonance frequency transition circuit, A first inductor connected in series with the dielectric resonator; A second inductor connected in series with the first inductor; A first capacitor connected in parallel with the second inductor; And And a second capacitor connected in series with the second inductor. The method of claim 1, The resonance frequency shifting circuit is formed on a PCB, the RF antenna using a dielectric resonator, characterized in that the PCB with the resonance frequency shifting circuit is coupled to the dielectric resonator. A dielectric resonator for resonating a signal of a preset frequency band; A resonance frequency shifting circuit coupled to the dielectric resonator to shift a frequency resonating in the dielectric resonator, The resonant frequency shifting circuit is formed on a PCB, the PCB is coupled to the dielectric resonator, the resonant frequency shifting circuit is an RF antenna using a dielectric resonator, characterized in that made of at least one combination consisting of a combination of an inductor and a capacitor . The method of claim 10, The dielectric resonator is an RF antenna using a dielectric resonator, characterized in that coupled to the PCB using a pad.

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