JP5246061B2 - RFID reader / writer mobile terminal - Google Patents

Description

The present invention relates to an RFID reader / writer portable terminal that performs reading and writing by wireless communication with an RFID tag.

An RFID (Radio Frequency IDentification) system includes an RFID tag for registering ID and information data, and an RFID reader / writer portable terminal for recognizing and controlling the RFID tag. An RFID tag (passive tag) without a built-in battery includes a built-in antenna and an IC chip, and receives power and communication data with the built-in antenna via radio waves and magnetic fields output from the antenna of the RFID reader / writer mobile terminal. The data is registered (encoded), and the data from the IC chip is returned to the RFID reader / writer portable terminal.

Patent Document 1 discloses an aerial shared device in which the number of feeders is reduced by using a transmission / reception combiner.

JP-A-8-46541

In recent years, an RFID reader / writer device has been required to enable communication with an RFID tag at a long distance. In order to communicate with a long-distance RFID tag, it is necessary to increase the transmission output of the RFID reader / writer device, but the communication frequency used in the RFID system is very high, and if the transmission output is increased, a power amplifier (high frequency circuit) The amount of heat generated in the camera increases, and it is difficult to prevent the user from transmitting heat to the portable type.

Further, in order to enable communication with a long-distance RFID tag, it becomes a problem where the antenna is provided in the RFID reader / writer portable terminal. That is, when the antenna is accommodated in the casing, the radio wave from the antenna is attenuated by the casing and the components used in the casing. Further, if the antenna is arranged at a position close to the user, the antenna characteristics are affected by the user.

The present invention has been made in order to solve the above-described problems, and an object of the present invention is to enable reading / writing to a RFID tag at a long distance and to cope with heat generation from a high-frequency circuit. An RFID reader / writer portable terminal is provided.

In order to achieve the above object, the invention of claim 1 is an RFID reader / writer portable terminal 10 having an RFID read / write function,
An antenna unit 70 obtained by unitizing an antenna 90 and a high-frequency circuit 80 is disposed outside the housing 14, and the high-frequency circuit 80 and the power circuit 56 in the housing are connected by high-frequency cables 62o and 62i.
The power circuit 56 supplies DC power for operating the high-frequency circuit, a high-frequency signal for RFID read / write, and a control low-frequency signal for controlling the high-frequency circuit to the high-frequency circuit 80. ,
The high-frequency circuit 80 separates the DC power, the high-frequency signal, and the control low-frequency signal, performs control based on the control low-frequency signal, and amplifies the high-frequency signal using the DC power And output to the antenna 90 side ,
The casing is formed in a rectangular shape, and the antenna is disposed in the antenna unit so as to be positioned at an end portion on the longitudinal direction side of the rectangular casing. Provided on the opposite side of the end in the longitudinal direction of the housing,
The high frequency circuit, and the technical features that you have been placed on the antenna unit so as to be positioned on the upper surface of the housing.

In the RFID reader / writer portable terminal according to the first aspect of the present invention, since the antenna unit in which the antenna and the high-frequency circuit are unitized is arranged outside the housing, it is high in order to read / write to a long-distance RFID tag. Even if the output radio wave is generated by the high frequency circuit, heat is not generated inside the housing, and the heat generated by the high frequency circuit attached to the outside of the housing is easily released to the outside air side. Thereby, it can respond to the heat_generation | fever from a high frequency circuit. Also, DC power for operating the high-frequency circuit from the power circuit, a high-frequency signal for RFID read / write, and a low-frequency signal for control for controlling the high-frequency circuit are transmitted via a single high-frequency cable for transmission. The high frequency circuit separates the DC power, the high frequency signal, and the control low frequency signal, performs control based on the control low frequency signal, and amplifies the high frequency signal using the DC power. Output to the antenna side. In other words, the power circuit and the high-frequency circuit can be connected by one transmission high-frequency cable and one reception high-frequency cable, and two electrical connection locations between the antenna unit and the power circuit provided in the housing ( The antenna unit can be easily attached to the housing.

The RFID reader / writer portable terminal according to claim 1 , wherein the antenna unit is attached to an end portion on a longitudinal side of a rectangular housing, and a grip portion to be gripped by an operator is provided on the opposite side of the end portion. . For this reason, the grip part gripped by the operator is separated from the antenna unit, and heat generated in the high-frequency circuit of the antenna unit is not easily transmitted to the grip part. In addition, since the grip portion that the operator grips is away from the antenna unit, it is difficult to be affected by the operator (human body, hand), and the antenna characteristics can be stabilized.

The RFID reader / writer portable terminal according to claim 3, wherein the high-frequency circuit is configured to separate a low-frequency pass filter for separating DC power, a high-frequency pass filter for separating a high-frequency signal, and a control low-frequency signal. A band pass filter. For this reason, the high frequency circuit can separate DC power, a high frequency signal, and a control low frequency signal from the output of the power circuit.

5. The RFID reader / writer portable terminal according to claim 4, wherein the high frequency circuit is configured to control a high power consumption mode for outputting a high output radio wave and a low power consumption mode for outputting a low output radio wave. Switch based on. It is possible to read / write to a RFID tag at a long distance by outputting a high output radio wave in the high power consumption mode, and at the time of reading / writing to a RFID tag at a short distance, power is used in the low power consumption mode. The battery driving time can be extended.

In the RFID reader / writer portable terminal according to the fifth aspect, the antenna unit is detachably attached to the housing, and the high-frequency cable and the antenna unit are connected via a connector of the antenna unit detachable from the high-frequency cable. That is, since there are two electrical connection locations for transmission and reception, the antenna unit can be easily detached from the housing, and when the operator accidentally drops the RFID reader / writer portable terminal In addition, the probability of failure of the antenna unit can be reduced by making the antenna unit easily detached from the housing.

FIG. 1A is a plan view of an information code reader according to an embodiment of the present invention, and FIG. 1B is a side view. 2A is a plan view of the information code reader according to the embodiment from which the antenna unit is removed, and FIG. 2B is a side view. 3A is a bottom view of the antenna unit, FIG. 3B is a side view, FIG. 3C is a block diagram of a high-frequency circuit in the antenna unit, and FIG. It is a block diagram of a DC / control signal / RF signal separation circuit. It is a block diagram which shows the electric constitution of an information code reader. It is a block diagram of a DC / control signal / RF signal coupling circuit. It is a step diagram showing a read / write operation of the information code reader. It is a flowchart which shows operation | movement switching in a control signal generation circuit. FIG. 8A is a waveform diagram of a signal from a DC / control signal / RF signal coupling circuit, FIG. 8A shows a waveform in the high power consumption mode, and FIG. 8B is a waveform in the low power consumption mode. Waveform is shown.

Hereinafter, an embodiment in which an RFID reader / writer portable terminal according to the present invention is applied to an information code reader will be described with reference to the drawings.
The information code reading device 10 according to the embodiment is a handy type that a user holds and operates by hand, and reads optical information such as a barcode and a two-dimensional code attached to a product and wirelessly communicates with an RFID tag. Can be done.

FIG. 1A is a plan view of the information code reader 10, and FIG. 1B is a side view. 2A is a plan view of the information code reader 10 with the antenna unit 70 removed, and FIG. 2B is a side view. In the information code reader 10 of the embodiment, an antenna unit 70 in which an antenna and a high-frequency circuit are unitized is attached to the outside of the casing 14 of the information code reader.

The information code reader 10 includes an operation unit 12 that also serves as a grip, a liquid crystal display device 46, and the like. The operation unit 12 is provided with, for example, a plurality of key switches 41, and the operation contents are instructed by these key switches 41. In addition to the key switch 41, the operation unit 12 is provided with a trigger switch 42 for instructing start of reading. An optical system unit, which will be described later, is disposed in a substantially rectangular opening (reading port) 16 formed at the front end of the housing 14 of the information code reader 10. A printed circuit board 20 on which a power circuit, a control circuit, etc., which will be described later are mounted, is accommodated in the housing 14.

3A is a bottom view of the antenna unit 70, and FIG. 3B is a side view. The antenna unit 70 accommodates an antenna unit 90 and a high frequency circuit 80 constituting a power amplifier. As shown in FIG. 1B, the DC power, RF signal, and control signal of the high frequency circuit are transmitted from the printed circuit board 20 via the single coaxial cable (high frequency cable) 62o for transmission of the antenna unit 70. It is supplied to the high frequency circuit 80. Received radio waves are supplied from the antenna unit 70 to the printed circuit board 20 through the coaxial cable 62i for reception. The coaxial cables 62o, 62i are provided with male connectors 60o, 60i, 64o, 64i at both ends. The male connectors 60o, 60i are connected to the female connectors 58o, 58i on the printed circuit board 20 side, and the male connectors 64o, 64i. Are connected to the female connectors 72o and 72i on the antenna unit 70 side. The male connectors 64o and 64i are fixed to the housing 14.

The antenna unit 70 is attached to the housing 14 by attaching the key-like engagement piece 18 provided on the upper surface 14U of the housing 14 shown in FIG. 2 to the key-like shape of the antenna unit shown in FIG. This is done by engaging with the engaging piece 74. The engagement piece 74 is provided in the introduction hole 74 a for introducing the engagement piece 18. The antenna unit 70 is a key-shaped engagement piece of the antenna unit by pushing the antenna unit 70 down to the upper surface 14U side of the housing in a state where the back surface side of the antenna unit 90 is in contact with the front end surface 14F of the housing 14. 74 engages with the engagement piece 18 of the housing 14, and the female connectors 72o and 72i of the antenna unit 70 engage with the male connectors 64o and 64i of the coaxial cables 62o and 62i. Installation to is completed. The antenna unit 70 has an L-shape provided with a lower surface 70U, a rear end surface 70F, and a chamfered surface 70C so as to contact the upper surface 14U, the front end surface 14F, and the chamfered surface 14C of the upper surface 14U and the front end surface 14F, respectively. Is formed.

In the embodiment, since the electrical connection is performed by the two female connectors 72o for transmission and the female connector 72i for reception, the antenna unit 70 can be easily attached. Further, it is engaged only by the engagement piece 74 provided in the vicinity of the female connectors 72o and 72i, and no attachment mechanism is provided on the end (antenna part) side opposite to the female connector.

In the information code reader 10, the antenna unit 70 is detachably attached to the housing 14, and the coaxial cables 62o and 62i and the antenna unit 70 are detachable from the male connectors 64o and 64i of the coaxial cables 62o and 62i. 70 female connectors 72o and 72i are connected. That is, since there are two electrical connection locations, the antenna unit 70 can be configured to be easily detachable from the housing 14, and even when the operator accidentally drops the information code reader 10, By allowing the unit 70 to be easily detached from the housing 14, the probability of failure of the antenna unit 70 can be reduced.

In the information code reader 10 according to the embodiment, the antenna unit 70 in which the antenna unit 90 and the high-frequency circuit 80 are unitized is disposed outside the housing 14, so that reading / writing to a long-distance RFID tag is possible. Therefore, even if high-frequency radio waves are generated in the high-frequency circuit 80, heat is not generated inside the housing, and heat generated in the high-frequency circuit 80 attached to the outside of the housing is easily released to the outside air side. Thereby, it is possible to cope with heat generation from the high frequency circuit 80.

In the information code reader 10 according to the embodiment, the antenna unit 70 is attached to the front end surface 14F on the longitudinal direction side of the rectangular casing 14, and the operation unit (gripping unit) 12 gripped by the operator is the front end. Provided on the opposite side of the surface 14F. For this reason, the operation unit 12 held by the operator is separated from the antenna unit 70, and heat generated in the high-frequency circuit 80 of the antenna unit 70 is difficult to be transmitted to the operation unit 12. Further, since the operation unit 12 held by the operator is separated from the antenna unit 70, it is difficult to be affected by the operator (human body, hand), and the antenna characteristics can be stabilized. Furthermore, by placing the antenna unit 70 outside the housing 14, it is possible to make it less susceptible to the housing 14.

Next, the electrical configuration of the information code reader 10 will be described with reference to the block diagram of FIG.
The information code reader 10 is configured to be capable of reading optical information such as a barcode and a two-dimensional code, and reading and writing information of an RFID tag by wireless communication. The information code reader 10 includes an optical system such as a light emitting diode 21, a condensing lens 24, a light receiving sensor 23, and an imaging lens 27, a transmission unit 52, a reception unit 54, a DC / control signal / RF signal combination circuit (power). Circuit) 56 and a microcomputer (hereinafter referred to as “microcomputer”) system such as a memory 35, a control circuit 40, a key switch 41, a trigger switch 42, and a liquid crystal display device 46.

First, the optical system will be described. The light emitting diode 21 functions as a light irradiator capable of irradiating the illumination light Lf, and is condensed by a condensing lens 24 in which a diffusion lens and a convex lens are combined. The light receiving sensor 23 includes an image sensor configured to be able to receive the reflected light Lr irradiated and reflected on the reading object R and the barcode B through the imaging lens 27. The imaging lens 27 functions as an imaging optical system capable of condensing incident light incident from the outside and forming an image on the light receiving surface 23 a of the light receiving sensor 23.

Next, a configuration outline of the microcomputer system will be described. The microcomputer system includes an amplification circuit 31, an A / D conversion circuit 33, a memory 35, an address generation circuit 36, a synchronization signal generation circuit 38, a control circuit 40, a key switch 41, a trigger switch 42, an LED 43, a buzzer 44, and a liquid crystal display device 46. The communication unit 48 and the like. The amplifier circuit 31, A / D conversion circuit 33, memory 35, address generation circuit 36, synchronization signal generation circuit 38, and control circuit 40 are mounted on the printed circuit board 20. As the name suggests, this microcomputer system is composed mainly of a control circuit 40 and a memory 35 that can function as a microcomputer (information processing device). The signal can be processed by software. The control circuit 40 also performs control related to the entire system of the information code reader 10.

An image signal (analog signal) output from the light receiving sensor 23 of the optical system is input to the amplification circuit 31 and amplified by a predetermined gain, and then input to the A / D conversion circuit 33. Converted into a digital signal. The digitized image signal, that is, image data is input to the memory 35 and stored. The synchronization signal generation circuit 38 is configured to generate a synchronization signal for the light receiving sensor 23 and the address generation circuit 36. The address generation circuit 36 is based on the synchronization signal supplied from the synchronization signal generation circuit 38. Thus, the storage address of the image data stored in the memory 35 can be generated.

The control circuit 40 is a microcomputer capable of controlling the entire information code reading device 10 and includes a CPU, a system bus, an input / output interface, and the like. The control circuit 40 can constitute an information processing device together with the memory 35 and has an information processing function. The control circuit 40 is configured to be connectable to various input / output devices (peripheral devices) via a built-in input / output interface. In this embodiment, the key switch 41, the trigger switch 42, the LED 43, A buzzer 44, a liquid crystal display device 46, a communication unit 48, and the like are connected. The control circuit 40 is configured to output the result of reading the two-dimensional code to the terminal management device (not shown) side via the communication unit 48.

A wireless system 50 including a transmission unit 52, a reception unit 54, and a DC / control signal / RF signal coupling circuit 56 mounted on the printed circuit board 20 performs wireless communication using radio waves with, for example, an RFID tag to supply power. It is for reading data. Here, not only reading data but also writing data to the RFID tag.

The configuration of the DC / control signal / RF signal coupling circuit 56 is shown in FIG.
The DC / control signal / RF signal combining circuit 56 combines the direct current power from the DC line 59, the RF signal from the transmission unit 52, and the control signal for the high frequency circuit from the control circuit to connect to the antenna unit. To the transmitting female connector 58o side. A control signal from the control circuit 40 is supplied to the transistor 56C via the operational amplifier 56A and the coupling capacitor C2. The coupling capacitor C2 is set to a capacitance value that allows a control signal (1 MHz or less) to pass therethrough. The transistor 56C is a DC power supplied from the DC line 59 and current boosts the control signal. The signal from the transistor 56C is output to the female connector 58o side via a choke coil 56D that passes a DC to low frequency signal (1 MHz or less). The RF signal from the transmission unit 52 is output to the female connector 58o via a coupling capacitor 56E set to a capacitance value that allows the RF signal (953 MHz band) to pass therethrough. On the other hand, the receiving female connector 58 i is connected to the receiving unit 54.

The direct current power from the DC line 59, the RF signal from the transmitter 52, and the control signal for the high frequency circuit from the control circuit are transmitted to the antenna unit via the single coaxial cable 62o connected to the female connector 58o. 70 side.

FIG. 3C is a block diagram illustrating a configuration of the high-frequency circuit 80. The DC power, RF signal, and control signal for the high frequency circuit sent via the coaxial cable 62o (male connector 72o) are separated by the DC / control signal / RF signal separation circuit 82. FIG. 3D is a block diagram showing a configuration of the DC / control signal / RF signal separation circuit 82. The direct current component separated by the low-pass filter 82C is rectified and smoothed by a direct current smoothing circuit 89, and then boosted and supplied as a power supply voltage for the power amplifier 86. The high frequency component (953 MHz band RF signal) separated by the high pass filter 82B is supplied to the power amplifier 86. The control signal (1 MHz or less) separated by the bandpass filter 82A is supplied to the control signal generation circuit 84. The control signal generation circuit 84 switches the power amplifier 86 on and off, and the operation mode of the power amplifier 86 (a high power consumption mode for outputting a high output radio wave, a low power output for outputting a low output radio wave). Switch the power consumption mode. That is, the power amplifier 86 operates in a high power consumption mode in which the bias of the final stage transistor is set to a point where the maximum output can be obtained when outputting a high output radio wave for communication with a distant RFID tag. When outputting low-power radio waves to communicate with nearby RFID tags, power consumption is reduced by operating in a low-power consumption mode in which the bias of the final stage transistor is set to a point with a high output rate. . The output from the power amplifier 86 is sent to the coaxial cable 92 connected to the antenna unit 90 via the circulator 88. The received radio wave is separated through the circulator 88 and connected to the receiving female connector 72i side.

Next, the RFID tag read / write operation by the information code reader 10 will be described. FIG. 6 is a step diagram illustrating the read / write operation of the information code reader 10. FIG. 7 is a flowchart showing the operation of the control signal generation circuit 84. FIG. 8 is a waveform diagram of a signal from the DC / control signal / RF signal coupling circuit 56. FIG. 8A shows a waveform in the high power consumption mode, and FIG. 8B is a waveform in the low power consumption mode. Shows the waveform.

First, supply of DC power is started (FIG. 6: S12). As a result, a DC component is output from the DC / control signal / RF signal combining circuit 56 as shown in FIG. Next, a control signal output from the control circuit 40 is sent (FIG. 6: S14). As shown in FIG. 8A, a sine wave as a control signal is superimposed on the DC component from the DC / control signal / RF signal combining circuit 56. Here, the power amplifier 86 is turned on by the sine wave (FIG. 6: S16). That is, the control signal generation circuit 84 determines that the power amplifier 86 is instructed to be turned on by detecting the sine wave (FIG. 7: S42; Yes), and turns on the power amplifier 86 (FIG. 7: S44). Further, since the cycle of the sine wave is relatively long, the control signal generation circuit 84 determines that the high output mode is instructed (FIG. 7: S46; Yes), and causes the power amplifier 86 to operate in the high power consumption mode. An instruction is given (FIG. 7: S50).

The information code reader 10 starts transmission / reception with the RFID tag (FIG. 6: S18). An RF signal is output from the transmitter 52, and an FR signal is further superimposed on the sine wave superimposed on the DC component from the DC / control signal / RF signal combining circuit 56 as shown in FIG. Thereby, communication with the RFID tag is performed (FIG. 6: S20). That is, the control circuit 40 transmits radio waves via the antenna unit 90, and demodulates the received signal received by the antenna unit 90 via the receiving unit 54 and extracts it as data. As a result, power is supplied to the RFID tag by radio waves, and wireless communication (read / write) of data is performed.

When the read / write is completed and the transmission / reception signal with the RFID tag is finished (FIG. 6: S22), the transmission of the RF signal is stopped and the off signal of the power amplifier 86 is transmitted (FIG. 6: S24). The operation of the power amplifier 86 is turned off (FIG. 6: S26). That is, the superimposition of the sine wave on the DC component is stopped. The control signal generation circuit 84 determines that the power amplifier 86 is instructed to be turned off by stopping the superposition of the sine wave (FIG. 7: S52; Yes), and the power amplifier 86 is turned off (FIG. 7: S54). Thereafter, the output of the DC component is stopped (FIG. 6: S28), and the process is terminated.

Here, a case where the low power consumption mode shown in FIG. 8B is instructed will be described.
First, supply of DC power is started (FIG. 6: S12). As a result, a DC component is output from the DC / control signal / RF signal combining circuit 56 as shown in FIG. Next, a control signal output from the control circuit 40 is sent (FIG. 6: S14). As shown in FIG. 8B, a sine wave as a control signal is superimposed on the DC component from the DC / control signal / RF signal combining circuit 56. Here, the power amplifier 86 is turned on by the sine wave (FIG. 6: S16). That is, the control signal generation circuit 84 determines that the power amplifier 86 is instructed to be turned on by detecting the sine wave (FIG. 7: S42; Yes), and turns on the power amplifier 86 (FIG. 7: S44). Further, since the cycle of the sine wave is relatively short, the control signal generation circuit 84 determines that the low output mode is instructed (FIG. 7: S46; No), and causes the power amplifier 86 to operate in the low power consumption mode. An instruction is given (FIG. 7: S48). Subsequent processing is the same as in the above-described high power consumption mode, and thus description thereof is omitted.

The information code reader 10 according to the embodiment includes a DC power for operating the power amplifier 86 from the DC / control signal / RF signal combination circuit 56, a high frequency signal (RF signal) for RFID read / write, and the power amplifier 86. A low-frequency control signal for controlling the signal is supplied to the high-frequency circuit 80 via a single coaxial cable 62o. The high-frequency circuit 80 receives DC power, a high-frequency signal, and a low-frequency control signal. The control is performed based on the low frequency control signal, and the high frequency signal is amplified using DC power and output to the antenna unit 90 side. That is, the DC / control signal / RF signal coupling circuit 56 and the high frequency circuit 80 can be connected by a single coaxial cable 62o, and the DC / control signal / RF signal coupling circuit provided in the antenna unit 70 and the housing 14 is provided. 56, the antenna unit 70 can be easily attached to the housing 14. As shown in FIG.

In the information code reader 10 of the embodiment, the high frequency circuit 80 separates the low frequency pass filter 82C for separating DC power, the high frequency pass filter 82A for separating high frequency signals, and the low frequency control signal. A band-pass filter 82B. For this reason, the high frequency circuit 80 can separate the DC power, the high frequency signal, and the low frequency control signal from the output from the DC / control signal / RF signal combination circuit 56.

In the information code reader 10 according to the embodiment, the power amplifier 86 of the high-frequency circuit 80 has a low power consumption mode for outputting a high output radio wave and a low power consumption mode for outputting a low output radio wave. Switching based on frequency control signal. It is possible to read / write to a RFID tag at a long distance by outputting a high output radio wave in the high power consumption mode, and at the time of reading / writing to a RFID tag at a short distance, power is used in the low power consumption mode. The battery driving time can be extended.

DESCRIPTION OF SYMBOLS 10 Information code reader 14 Case 40 Control circuit 52 Transmission part 54 Reception part 56 DC / control signal / RF signal coupling circuit (power circuit)
62o, 62i coaxial cable (high frequency cable)
70 antenna unit 72o, 72i female connector 80 high frequency circuit 82 DC / control signal / RF signal separation circuit 82A low pass filter 82B high pass filter 82C band pass filter 86 power amplifier 90 antenna unit

Claims (5)

An RFID reader / writer portable terminal having an RFID read / write function,
An antenna unit obtained by unitizing an antenna and a high-frequency circuit is disposed outside the housing, and the high-frequency circuit and the power circuit in the housing are connected by a high-frequency cable.
The power circuit supplies DC power for operating the high-frequency circuit, a high-frequency signal for RFID read / write, and a control low-frequency signal for controlling the high-frequency circuit to the high-frequency circuit,
The high-frequency circuit separates the DC power, the high-frequency signal, and the control low-frequency signal, performs control based on the control low-frequency signal, and amplifies the high-frequency signal using the DC power. Output to the antenna side ,
The casing is formed in a rectangular shape, and the antenna is disposed in the antenna unit so as to be positioned at an end portion on the longitudinal direction side of the rectangular casing. Provided on the opposite side of the end in the longitudinal direction of the housing,
The high frequency circuit, RFID reader-writer portable terminal, wherein said Rukoto are located in the antenna unit so as to be positioned on the upper surface of the housing. The antenna unit is formed in an L shape having a lower surface and a rear end surface so as to contact the upper surface and the front end surface of the housing, respectively.
  The high-frequency circuit is disposed on the lower surface;
  2. The RFID reader / writer portable terminal according to claim 1, wherein the antenna is arranged on the back end face side. The high-frequency circuit is
A low-frequency pass filter for separating the DC power;
A high-frequency pass filter for separating the high-frequency signal;
The RFID reader / writer portable terminal according to claim 1, further comprising: a band-pass filter for separating the low frequency signal for control. The high frequency circuit switches between a high power consumption mode for outputting a high output radio wave and a low power consumption mode for outputting a low output radio wave based on the control low frequency signal. The RFID reader / writer portable terminal according to any one of claims 1 to 3. The antenna unit is detachably attached to the housing, and the high-frequency cable and the antenna unit are connected to each other via a connector of the antenna unit that is detachable from the high-frequency cable. Item 1. The RFID reader / writer portable terminal according to Item 1 .

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