KR20100060887A - Antanna module for operating multi band, and communication system for the same - Google Patents

Abstract

PURPOSE: An antenna module operating in multi-bands and a communication system comprising the antenna module are provided to combine at least two antennas operating in operation frequencies into one type thereby miniaturizing the antenna module. CONSTITUTION: An RFID(Radio Frequency Identification System) system comprises an antenna module(10) and a conductive plate. The antenna module comprises the first antenna and the second antenna. The first antenna is formed on the first dielectric substrate(20). The first antenna resonates in the first frequency wideband. The second antenna is formed on the second dielectric substrate(30). The second antenna resonates in the secondary frequency band higher than the first frequency band. The second dielectric substrate is connected to one side of the first dielectric substrate.

Description

An antenna module operating in a multi-band and a communication system including the antenna module {Antanna module for operating multi band, and communication system for the same}

An embodiment of the present invention relates to a wireless communication technology, and more particularly, to an antenna module operating in a multi-band and a communication system including the antenna module.

Radio Frequency IDentification is a non-contact recognition system that can identify data using radio frequency (RF) for data stored in an RFID tag (tag or transponder) with a small microchip. to be.

This system, which appeared in the 1980s, is also known as dedicated short range communication (DSRC) or radio identification system.

Currently, RFID tags are applied to the fields of logistics / distribution, asset tracking, security, and the like, and are attached to an object to implement RFID according to the development of semiconductor technology, that is, the IC chip into which the information of the object is input becomes low, It is emerging as a technology that can maximize the efficiency and competitiveness of object management.

A communication system, for example, an RFID system includes an RFID reader (also called an integrator), an antenna, and an RFID tag (also called a transponder), wherein the RFID tag drives a microchip that records ID data and drives the microchip. It consists of an antenna that transmits and receives ID data while getting power for.

RFID system is used in various frequency bands such as low frequency (125 / 134kHz), high frequency (13.56MHz), microwave (UHF, 433MHz, 860 ~ 960MHz), and microwave (2.4 ~ 2.45GHz). The frequency band used depends on the characteristics or the surrounding environment. The antenna is one of the largest components of the wireless communication terminal. The lower the frequency, the longer the antenna.

Recently, as the wireless communication terminal becomes smaller and lighter due to the development of semiconductor technology, the antenna also needs to be small and light. However, if the antenna is simply made small, the normal bandwidth or gain of the antenna decreases, so the characteristics such as radiation efficiency deteriorate, making it difficult to operate normally. Due to such deterioration of performance, it is difficult to realize the miniaturization and ultraslimness of the terminal. Due to this problem, there is a need for a miniaturized antenna capable of resonating in multiple frequency bands.

Therefore, there is a need for an antenna module capable of miniaturization while minimizing deterioration of characteristics and a communication system including the antenna module.

The problem to be solved by the present invention is to provide a miniaturized antenna module without degrading the performance of the antenna element.

In addition, an object of the present invention is to provide an antenna module capable of operating simultaneously in a plurality of frequency bands.

In addition, the problem to be solved by the present invention is to provide a communication system that can improve the space utilization by minimizing the space occupied and unnecessary space in the terminal by providing an antenna module of the optimized form according to the appearance and operating environment of the terminal will be.

An antenna module according to an embodiment of the present invention includes a first antenna and a second antenna. The first antenna is formed on a first dielectric substrate, resonates in a first frequency band, and the second antenna is formed on a second dielectric substrate connected to one side of the first dielectric substrate. Resonance occurs in the second frequency band higher than the frequency band.

The antenna module may be formed on a third dielectric substrate connected to the other side of the first dielectric substrate, and may further include a diplexer for feeding the signal of the first antenna and the signal of the second antenna. .

The antenna module may further include a reflector connected to one side of the antenna module.

An angle at which the first dielectric substrate is connected to the second dielectric substrate may be variably adjusted.

The first frequency band may be 910 MHz, and the second frequency band may be 2.4 GHz.

Each of the first antenna and the second antenna may be implemented as a folded dipole antenna of a meander type.

In addition, the communication system according to an embodiment of the present invention includes a communication module including an IC chip, and an antenna module electrically connected to one side of the communication module. The antenna module is formed on a first dielectric substrate, is formed on a first antenna resonating in a first frequency band, and on a second dielectric substrate connected to one side of the first dielectric substrate, and the first frequency band. It may include a second antenna that resonates in a higher second frequency band.

The antenna module may be formed on a third dielectric substrate connected to the other side of the first dielectric substrate, and may further include a diplexer for feeding the signal of the first antenna and the signal of the second antenna. .

The antenna module may use the ground of the communication module as a reflector.

An angle at which the first dielectric substrate is connected to the second dielectric substrate may be variably adjusted.

In addition, the communication system according to an embodiment of the present invention includes a communication module including an IC chip, and an antenna module formed on one side of the communication module. The antenna module is formed on a substrate of the communication module and resonates in a first frequency band resonating in a first frequency band, and is formed on a substrate of the communication module and resonating in a second frequency band higher than the first frequency band. It may include a second antenna.

The antenna module may be formed on a substrate of the communication module, and further include a diplexer for feeding the signal of the first antenna and the signal of the second antenna.

The antenna module may use the ground of the communication module as a reflector.

The antenna module according to the embodiment of the present invention can reduce the layout size by combining at least two antennas operating at different operating frequencies in one form, thereby miniaturizing the antenna module.

In addition, the antenna according to an embodiment of the present invention is designed in a form suitable for the appearance and operating environment of the terminal and can be disposed in the free space of the terminal, thereby reducing the unnecessary space in the terminal without harming the appearance of the terminal. It has an effect.

In addition, the antenna according to the embodiment of the present invention has an effect of improving the recognition distance of the antenna module by connecting one side of the antenna module to the reflector, to have a directivity in a specific direction.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

1 is a schematic block diagram of a communication system including an antenna module according to an exemplary embodiment of the present invention. In general, a communication system, such as RFID system 60, is used in various frequency bands, such as low frequency (125/134 kHz), high frequency (13.56 MHz), microwave (UHF, 433 MHz, 860-960 MHz), and microwave (2.4-2.45 GHz). Can be used. According to an embodiment of the present invention, a first antenna of a communication system, for example, an RFID system 60 performs a communication operation at a frequency of 910 MHz in a first frequency band, for example, a UHF band, and a second antenna is higher than the first frequency band. An example of performing a communication operation in two frequency bands, for example, a 2.4 GHz frequency in a micro band, is not limited thereto.

Referring to FIG. 1, a communication system such as an RFID system 60 includes an antenna module 10 and a conductor plate 55 used as ground and reflector plates.

The antenna module 10 includes a first antenna (ANT1 of FIG. 2) operating in a first frequency band, a second antenna (ANT2 of FIG. 2) operating in a second frequency band higher than the first frequency band, It may further include a circuit portion such as a diplexer (41 in FIG. 2).

The first antenna ANT1 transmits a transmission signal output from a communication chip, for example, the IC chip 53, to the outside through a first frequency band, for example, a 910 MHz frequency band, or transmits a reception signal transmitted from the outside to the first frequency band. Can be received through.

The second antenna ANT2 transmits the transmission signal output from the communication chip, for example the IC chip 53, to the outside through a second frequency band higher than the first frequency band, for example, the 2.4 GHz frequency band, or is transmitted from the outside. The received signal may be received through the second frequency band.

Each of the first antenna ANT1 and the second antenna ANT2 radiates a transmission signal to the outside using a current supplied from the IC chip 53, or transmits a reception signal transmitted from the outside to the IC chip 53. have.

The diplexer 41 is implemented in the form of a chip, a concentrator, or the like, and is electrically connected to each of the first antenna ANT1 and the second antenna ANT2. The diplexer 41 separates the first reception signal input to the first antenna ANT1 and the second reception signal input to the second antenna ANT2 into signals of a first frequency band and signals of a second frequency band. Each of the separated signals may be transmitted to the IC chip 53.

In addition, the diplexer 41 separates the transmission signal transmitted from the IC chip 53 into two frequency bands, for example, a signal of the first frequency band and a signal of the second frequency band, in which the frequency spectrum does not overlap, and separates the signal. Each of the signals may be classified into a signal path for each frequency and output to each of the first antenna ANT1 and the second antenna ANT2.

On the conductor plate 55 used as the ground and the reflection plate, the IC chip 53 and elements or chips used in the RFID system may be installed to be implemented as a communication module. In this case, the ground on the conductor plate 55 may generally operate as the ground of the elements used in the RFID system 60 or the ground of the IC chip 53, and at the same time, may act as the reflector of the antenna module 10.

In addition, by installing components necessary for a communication system such as a display such as an LCD on the ground, the space utilization of the upper portion of the conductor plate 55 may be increased. Therefore, the RFID system 60 according to the embodiment of the present invention has an effect of reducing the layout area of the RFID system 60 by using the ground formed on the communication module substrate as a reflector without a separate reflector.

The IC chip 53 incorporates an RF transmission / reception circuit, control logic, and internal memory. The RFID system 60 including the first antenna ANNT1, the second antenna ANT2, and the IC chip 53 reflects and also reflects an RF signal transmitted from a reader, for example, a signal of an ultra high frequency (UHF) band. The RF signal may be modulated according to the data stored in the memory and transmitted to the reader.

Here, the RF transmission / reception circuit may perform pulse width modulation for changing a amplitude, a frequency, or a phase of a portion of the first received signal received through the first antenna ANT1 or the second received signal received through the second antenna ANT2 ( PWM; Pulse Width Modulation (ASK), Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), Phase Shift Keying (PSK), Quadrature PSK (QPSK), Differential PSK (DPSK) It can be converted into a high frequency signal using a variety of modulation schemes such as, and Quadrature Amplitude Modulation (QAM).

The control logic may control an input / output operation of data stored in the internal memory by controlling at least one of the RF transceiver circuit and the internal memory.

That is, the antenna module 10 is electrically connected to one side of the communication module, and the signal of the first frequency band input through the first antenna ANT1 and the second frequency band input through the second antenna ANT2. After passing through the diplexer 41, the signal of can be transmitted to the IC chip 53 through one strip line on the ground, and the diplexer 41 transmits the transmission signal output from the IC chip 53. After passing through, the first antenna ANT1 and the second antenna ANT2 may be separately input according to respective operating frequencies.

2 is a perspective view of an antenna module according to an exemplary embodiment, and FIG. 3 is a cross-sectional view taken along the line II ′ of the antenna module illustrated in FIG. 2. Each of the first antenna ANT1 and the second antenna ANT2 according to the embodiment of FIG. 2 has a folded dipole antenna having a meander shape to reduce the length of the antenna. An embodiment of the present invention is described as an antenna, but the present invention is not limited thereto.

2 and 3, an antenna module 10 according to an embodiment of the present invention may include a first dielectric substrate 20 on which a first antenna ANT1 is formed and a second antenna ANT2 on a second antenna ANT2. It is composed of a second dielectric substrate 30, a third dielectric substrate 40, and a fourth dielectric substrate 50. That is, the antenna module 10 according to the embodiment of the present invention may be implemented as one antenna module 10 on a plurality of dielectric substrates 20, 30, 40, and 50.

Each of the first to fourth dielectric substrates 20, 30, 40, and 50 may be a substrate made of a non-conductive material such as a PCB circuit board and a flexible printed circuit board (FPCB) substrate. In addition, the PCB circuit board may be implemented as a multi-module circuit board having a plurality of layers.

The first antenna ANT1 may be formed on the first dielectric substrate 20 to process the first pattern 21 and the negative signal, for example, to process the conductive lines having two different poles, for example, the (+) signal. The second pattern 23 is formed as a conductor pattern, and transmission and reception of a frequency signal having a wavelength corresponding to an electrical length of each of the first pattern 21 and the second pattern 23, that is, a signal of a first frequency band, is performed. Can be done. In addition, a feeder 25 may be further formed on the first dielectric substrate 20 to feed the signal of the first pattern 21 and the signal of the second pattern 23. In this case, as illustrated in FIG. 3, the first antenna ANT1 may include a conductor pattern formed on the first dielectric substrate 20, for example, the first pattern 21, the second pattern 23, and the first dielectric. The conductive pattern may be formed under the substrate, for example, the first pattern and the second pattern 23 ′.

The second dielectric substrate 30 is connected to one side of the first dielectric substrate 20, and the second antenna ANT2 has two different poles on the second dielectric substrate 30. The third pattern 31 for processing the (+) signal and the fourth pattern 33 for processing the (-) signal are formed as a conductor pattern, and the third pattern 31 and the fourth pattern 33 Transmission and reception of a frequency signal having a wavelength corresponding to an electrical length, that is, a signal of a second frequency band may be performed. In addition, a feeder 35 may be further formed on the second dielectric substrate 30 to feed the signal of the third pattern 31 and the signal of the fourth pattern 31. In this case, as illustrated in FIG. 3, the second antenna ANT2 may include a conductor pattern formed on the second dielectric substrate 20, for example, the third pattern 31, the fourth pattern 33, and the second dielectric. The conductive pattern may be formed under the substrate, for example, the third pattern and the fourth pattern 33 ′.

Since a general dipole antenna is designed on a λ / 2 basis, the lower the frequency of the communication frequency band, the longer the antenna length. Therefore, the electrical length of the first antenna ANT1 resonating in the first frequency band is longer than the electrical length of the second antenna ANT2 resonating in the second frequency band lower than the first frequency band.

In addition, when each of the first antenna ANT1 and the second antenna ANT2 is implemented as a folded dipole antenna, in the case of a folded dipole antenna operating at a resonance frequency lower than that of a general dipole antenna at the same length, The projected length, the height of the dielectric, etc. affect the antenna's resonant frequency and input impedance. Therefore, the frequency can be shifted by adjusting the size of the antenna module 10 and the part except the ground to adjust the resonance frequency, and by installing a balun on each of the first antenna ANT1 and the second antenna ANT2 The impedance can be matched.

An angle at which the first dielectric substrate 20 and the second dielectric substrate 30 are connected may be variably adjusted in a predetermined range (0 degrees to 360 degrees). For example, the first dielectric substrate 20 and the second dielectric substrate 30 may be vertically connected.

The third dielectric substrate 40 is connected to the other side of the first dielectric substrate 20, and a diplexer for processing a signal of the first frequency band and a signal of the second frequency band on the third dielectric substrate 40. The 41 and the feed part 43 may be formed.

A feeder 43 for inputting and outputting a signal transmitted between the diplexer of the antenna module 10 and the IC chip 53 is formed on the third dielectric substrate 40. In addition, a bonding pad (not shown) for mounting the antenna module 10 on an external communication module substrate, for example, the conductor plate 55 may be further formed.

In addition, a diplexer 41 for processing a signal of a first frequency band and a signal of a second frequency band may be implemented under the third dielectric substrate 40. The diplexer 41 is electrically connected to each of the feed section 25 of the first antenna ANT1 and the feed section 35 of the second antenna ANT2 by wire or solder, and the first antenna ANT1. The signal input through the signal and the signal input through the second antenna ANT2 may be received.

The fourth dielectric substrate 50 is connected between the second dielectric substrate 30 and the third dielectric substrate 40, and the second frequency input on the fourth dielectric substrate 50 through the second antenna ANT2. A transmission line for transmitting a band signal to the diplexer 41 may be formed.

A plurality of junctions may be further formed at predetermined positions on each side of each of the first to fourth dielectric substrates 20, 30, 40, and 50. For example, the antenna module 10 couples each of the plurality of junctions at positions corresponding to each other to each other using a method such as wire or soldering, so that the first to fourth dielectric substrates 20, 30, 40, and 50 are connected to each other. Each can be electrically connected to each other.

In addition, the antenna module 10 combines the bonding pad formed on the third dielectric substrate 40 and the bonding pad formed on one side of the communication module by using a method such as wire or soldering to connect the antenna module to a predetermined position of the communication module. The antenna module 10 and the communication module can be electrically connected to each other by fixing to the antenna module 10. In addition, when a connection terminal such as a connector is provided on the third dielectric substrate 40 instead of a bonding pad, the antenna module 10 may be detachably inserted into the communication module.

The antenna module 10 may use the ground of the communication module as a reflector. In this case, the antenna module 10 is electrically connected to the ground of the communication module, that is, the reflector, thereby increasing the intensity of the signal radiated from the IC chip 53 through the first antenna ANT1 and the second antenna ANT2. Can be.

 In general, dipole antennas are omnidirectional antennas, which have very low amplification and have low power strengths of signals transmitted and received by receiving and radiating radio waves of equal magnitude in all directions without a specific direction.

However, in the embodiment of the present invention, by connecting a reflector to one side of the antenna module 10 having an omnidirectional radiation characteristic, the signal of the first frequency band radiated from the antenna module 10 using the reflector and And / or suppress signal components radiated in a particular direction with respect to signals in the second frequency band. Therefore, the antenna module 10 can increase the intensity of the transmitted signal by making the directivity by reducing the radiation amount of the rear component radiated in a specific direction, for example, the direction connected to the reflector and increasing the radiation amount of the front component.

Accordingly, the RFID system 60 according to the embodiment of the present invention can increase the recognition distance between the tag and the reader by increasing the strength of the transmission signal transmitted from the IC chip 53 by increasing the gain of the antenna module 10. It works.

In addition, the antenna module 10 may be surrounded by a shell 57 formed of a non-conductive material such as plastic.

The layout size and structure of each of the first to fourth dielectric substrates 20, 30, 40, and 50 may vary depending on the appearance, free space, and operating environment of the terminal to which the antenna module 10 is applied. . That is, although the structure of the antenna module 10 according to the embodiment of the present invention has a rectangular shape, its shape and structure may vary according to the external shape of the terminal.

4 is a schematic block diagram of a communication system including an antenna module according to another exemplary embodiment of the present disclosure. Referring to FIG. 4, a communication system, such as an RFIE system 70, includes an antenna module 80 and a conductor plate 55 used as ground and reflector plates. The RFID system 70 shown in FIG. 4 has the same components as the RFID system 60 of FIG. 1 except that each of the components is implemented on one PCB substrate.

The antenna module 80 includes a first antenna ANT1 and a second antenna ANT2 formed on one dielectric substrate 75. On the conductor plate 55, circuit portions such as the IC chip 53 and the diplexer 41 are implemented. In this case, the dielectric substrate 75 on which the antenna module 80 is implemented and the circuit board of the communication module, that is, the conductor plate 55 may be implemented as one PCB substrate.

 That is, as shown in FIG. 4, the structure of the antenna module 10 of FIG. 2 is provided with a reflector such as the first antenna ANT1, the second antenna ANT2, the IC chip 53, and the ground. By positioning and using, it is possible to implement an antenna module 70 having a high gain and a thin shape.

As described above, the communication systems 60 and 70 according to the embodiment of the present invention form a conventional folded dipole antenna in a meander form, compared to a patch antenna or a dipole antenna used in a communication system using the same resonance frequency. By using a reflector while reducing the space used, it has a higher gain than the previous antennas and can have a high recognition distance for mobile use. In addition, by configuring an antenna operating at two different resonant frequencies with a diplexer, a mobile communication module requiring multi-channel communication and a high data rate can be realized.

Therefore, the antenna module 10 or 80 according to the embodiment of the present invention can reduce the layout size by combining two antennas operating at different operating frequencies in one form, thereby miniaturizing the antenna module. have.

In addition, the antenna according to an embodiment of the present invention is designed in a form suitable for the appearance and operating environment of the terminal and can be disposed in the free space of the terminal, thereby reducing the unnecessary space in the terminal without harming the appearance of the terminal. It has an effect.

In addition, the antenna according to the embodiment of the present invention has an effect of improving the recognition distance of the antenna module by connecting one side of the antenna module to the reflector, to have a directivity in a specific direction.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings cited in the detailed description of the invention, a brief description of each drawing is provided.

 1 is a schematic block diagram of a communication system including an antenna module according to an exemplary embodiment of the present invention.

2 is a perspective view of an antenna module according to an exemplary embodiment.

3 is a cross-sectional view taken along the line II ′ of the antenna module illustrated in FIG. 2.

4 is a schematic block diagram of a communication system including an antenna module according to another exemplary embodiment of the present disclosure.

Claims (13)

A first antenna formed on the first dielectric substrate and resonating in the first frequency band; And And a second antenna formed on a second dielectric substrate connected to one side of the first dielectric substrate and resonating in a second frequency band higher than the first frequency band. The method of claim 1, wherein the antenna module, And a diplexer formed on a third dielectric substrate connected to the other side of the first dielectric substrate and configured to feed a signal of the first antenna and a signal of the second antenna. The method of claim 1, wherein the antenna module, The antenna module further comprises a reflector connected to one side of the antenna module. The antenna module of claim 1, wherein an angle at which the first dielectric substrate is connected to the second dielectric substrate is variably adjusted. The antenna module of claim 1, wherein the first frequency band is 910 MHz and the second frequency band is 2.4 GHz. The antenna module of claim 1, wherein each of the first antenna and the second antenna is implemented as a folded dipole antenna of a meander type. A communication module including an IC chip; And An antenna module electrically connected to one side of the communication module, The antenna module, A first antenna formed on the first dielectric substrate and resonating in the first frequency band; And And a second antenna formed on a second dielectric substrate connected to one side of the first dielectric substrate and resonating in a second frequency band higher than the first frequency band. The method of claim 7, wherein the antenna module, And a diplexer formed on a third dielectric substrate connected to the other side of the first dielectric substrate and configured to feed a signal of the first antenna and a signal of the second antenna. The communication system of claim 7, wherein the antenna module uses the ground of the communication module as a reflector. The communication system of claim 7, wherein an angle at which the first dielectric substrate is connected to the second dielectric substrate is variably adjusted. A communication module including an IC chip; And An antenna module is formed on one side of the communication module, The antenna module, A first antenna formed on a substrate of the communication module and resonating in a first frequency band; And And a second antenna formed on a substrate of the communication module and resonating in a second frequency band higher than the first frequency band. The communication system of claim 11, further comprising a diplexer formed on a substrate of the communication module and configured to feed a signal of the first antenna and a signal of the second antenna. The method of claim 11, wherein the antenna module, A communication system using the ground of the communication module as a reflector.

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