JPH0264494A - Radio receiving apparatus - Google Patents

Abstract

PURPOSE:To increase the power capacity of a drive power supply and to also increase a receivable distance by also utilizing DC power wherein the carrier wave of a signal wave is rectified as the drive power supply in addition to DC power wherein the carrier wave of an energy wave is rectified. CONSTITUTION:The question signal wave received by the antenna of a response device 30 is rectified by a detection and rectifying circuit 31 and the output thereof is given to an HPF 22 and an LPF 32. By this method, a question signal is demodulated from the HPF 22 and the carrier wave of the question signal wave is converted to DC power to be outputted from the LPF 32. The DC power due to the carrier wave of the question signal wave and the DC power due to the carrier wave of the energy wave outputted from an LPF 15 are added by an adder circuit 33 to be utilized as the drive power supply of the device 30. Therefore, the power capacity of the drive power supply is increased and a proper receivable distance becomes long. Further, the energy wave and the signal wave are received by one antenna to make it possible to achieve miniaturization.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a radio receiving device that receives a microwave band carrier wave transmitted from a radio receiving device and operates using the carrier wave as a driving power source.

(Prior Art) In recent years, response devices have been carried by people or attached to moving objects.
This answering device stores appropriate information of the person in possession or the attached moving object, and transmits an interrogation signal by microwave from the fixed interrogation device to this answering device,
The response device that receives this interrogation signal transmits an appropriate response signal to the interrogation device using microwaves, and the interrogation device collates the received response signal with an appropriate means to identify large or moving objects, etc. is proposed. The personal information stored in this response device allows the response device to function as an ID card or driver's license. In addition, in manufacturing plants that produce high-quality, low-volume heels, etc., this response device, which stores specification data, is attached to semi-finished products on the production line, and an interrogation device placed in each process queries the response device for specifications. , If the response device is made to perform work according to this specification, it is possible to make the response device function as an electronic specification instruction sheet.

Here, when the response device functions as the above-mentioned ID cart, driver's license, specification instruction sheet, etc., it is inconvenient to supply drive power from a commercial AC power source for carrying or moving, and the built-in battery If the driving power is supplied from the external interrogation device, it will not be sufficient in terms of miniaturization and longevity of the response device. Techniques to be used are disclosed in Japanese Patent Laid-Open Nos. 56-140486 and 63-54023. An overview of the system consisting of the conventional answering device and interrogating device shown above will be explained with reference to the block circuit diagram shown in FIG.

In FIG. 4, the interrogation device 1 is provided with a device 7 that oscillates a first frequency 1+ (for example, 2440 MHz) in the microwave band.
The oscillation circuit 2 of Jr11 and the second frequency f2 (for example, 2455MHz
) is provided. Then, the first frequency f outputted from the first oscillation circuit 2 is amplified by the amplifier 4, and an energy wave having the first frequency f as a carrier wave is transmitted from the antenna 5 by vertical polarization without modulation. It is transmitted to the response device 6 as a. Also,
The second frequency f2 output from the second oscillation circuit 3 is
It is A1 modulated by the interrogation signal in the modulation circuit 7, further amplified by the amplifier 8, and transmitted from the antenna 9 as an interrogation signal wave with the second frequency f2 as a carrier wave by horizontal polarization toward the response device 6.

The question bag jul is provided with an antenna 10 that receives a response signal wave having the second harmonic 2f of the first frequency f transmitted from the response device 6 as a carrier wave. From the response signal wave received by this antenna IO, a band pass filter +1 and a low noise block down converter 1 are applied.
2, the response signal is demodulated. Note that the interrogation device 1 has a built-in microprocessor or the like (not shown), which identifies whether or not the demodulated response signal is appropriate for the interrogation signal, or executes a process etc. according to the response signal. The operation No. 13 to be performed is outputted, etc.

The response device 6 is provided with an antenna 13 that receives energy waves transmitted from the antenna 5, and the energy waves received by the antenna 13 are converted into DC power +B via a rectifier circuit 14 and a low-pass filter I5. Ru. This DC power is used as a driving power source for the response device 6. Further, the energy wave received by the antenna 13 is converted into a second harmonic wave 2f by a multiplier circuit 16 including a diode or the like, and is applied to a modulation circuit 18 via a bandpass filter 17 as a carrier wave of a response signal wave. In this variable A circuit 18, the second
The high single wave 2f is A1 modulated by the response signal, and is transmitted from the antenna I9 to the interrogation device 1 as a response signal wave. Further, the response device 6 is provided with an antenna 20 for receiving the interrogation signal wave transmitted from the antenna 9, and the interrogation signal is demodulated from the interrogation signal wave received by the antenna 20 via the detection circuit 21 and the bypass filter 2z. Ru. Note that the response device 6 includes a microprocessor, etc. (not shown).
It has a built-in controller, stores appropriate information, and calculates and outputs an appropriate response signal in response to the demodulated interrogation signal.

(Invention or Problem to be Solved) By the way, in the answering device 6 mentioned above, the interrogating device 1
As the distance from the response device 6 increases, the electric field strength of the energy waves that can be received by the response device 6 becomes weaker. Then, the amount of direct current power obtained via the rectifier circuit 14 and the low-pass filter 15 is reduced accordingly. As a result, a situation arises in which an appropriate operating voltage for the built-in microprocessor etc. cannot be obtained. Therefore, depending on the strength of the energy waves radiated from the antenna 5 of the interrogation device 1, the distance from the interrogation device 1 at which the response device 6 can properly communicate is limited.

It is obvious that the longer the communicable distance, the more convenient it is when the response device 6 functions as an ID card or the like. However, the strength of the energy waves that can be emitted from the interrogation device 1 is limited by laws and regulations. Furthermore, from the viewpoint of reducing the size and weight of the response device 6, there are limits to making the antenna 13 for receiving energy waves large or having an array shape. Therefore, the communication distance of the response device 6 cannot be sufficiently obtained, and it is desired to improve the communication distance to a longer distance.

The present invention has been made in view of the circumstances of the conventional system consisting of the above-mentioned answering device and interrogating device, and provides a wireless receiver that can be applied to the answering device to appropriately lengthen the distance that can be used. The first goal is to provide.

(Means for Solving the Problems) In order to achieve the above object, the wireless receiving device of the present invention uses energy transmitted from a wireless transmitting device using two carrier waves that differ in at least one of their frequencies and planes of polarization. In a wireless receiving device that receives waves and signal waves, a first antenna that receives the energy waves described in Section 11, and a first rectifier circuit that rectifies the carrier wave of the energy waves received by the first antenna. a second antenna that receives the signal wave; a second rectifier circuit that rectifies the carrier wave of the illumination branch received by the second antenna;
, and is configured to use both the DC power output from the first and second rectifier circuits as a driving power source for the wireless receiving device.

In addition, in a wireless receiving device that receives an energy wave and a branched wave transmitted from a wireless transmitter using two carrier waves with different polarization planes, the energy wave and the signal wave are received together, and the energy waves and the signal wave are each received from separate feed lines. one antenna to be output, a first rectifier circuit that rectifies the carrier wave of the energy wave output from the antenna, and a second rectifier circuit that rectifies the carrier wave of the signal wave output from the antenna. , and the DC power output from the first and second rectifier circuits may both be used as a driving power source for the wireless receiving device.

Furthermore, in a wireless receiving device that receives an energy wave and a signal wave respectively transmitted from a wireless transmitting device by two carrier waves with slightly different frequencies and the same polarization plane, 11η
one antenna that receives both the energy wave and the signal wave and outputs them from the same feed line; and one rectifier circuit that rectifies both the energy wave and the carrier wave of the signal wave output from the antenna, The configuration may be such that DC power output from the circuit is used as a driving power source for the wireless receiving device.

(Function) The second antenna that receives the signal wave is equipped with a rectifier circuit that rectifies the carrier wave of the signal wave.
Since DC power generated by the signal wave is added and used as a driving power source for the wireless receiving device, the power capacity of the driving power source increases by the amount generated by the signal wave. As a result, the distance over which a response device to which the wireless receiving device of the present invention is applied can properly communicate becomes longer.

Further, if the energy wave and the No. 43 wave transmitted with different polarization planes are received by one antenna, the space for arranging the antenna becomes smaller.

Furthermore, if the energy wave and the signal wave transmitted at slightly different frequencies with the same polarization plane are received by one antenna,
The space for arranging the antenna becomes smaller, and the rectifier circuit that rectifies the energy wave and the No. 48 wave becomes common.

(Example) Hereinafter, an example of the present invention will be described with reference to FIG. FIG. 1 is a block circuit diagram showing an outline of a system of a response device and an interrogation device in which an embodiment of the wireless reception device of the present invention is applied. In FIG. 1, the same or equivalent circuit blocks as those in FIG. 4 are given the same reference numerals and redundant explanations will be omitted.

The differences in FIG. 1 from those shown in FIG. 4 are as follows.

First, the question f received by the antenna 20 of the response device 30
The branched wave is rectified by a detection and rectification circuit 31, and its output is given to a bypass filter 22 and a low-pass filter 32. The interrogation signal is demodulated from this bypass filter 22 in the same manner as in FIG. And low pass filter 3
2, the carrier wave of the interrogation signal wave is converted into DC power and output. The DC power due to the carrier wave of this interrogation signal wave and the DC power due to the carrier wave of the energy wave output from the low-pass filter 15 are given to an adder circuit 33, and the DC power output from the adder circuit 33 is the wireless power of the present invention. It is used as a driving power source for the response device 30 commonly used in the receiving device. Furthermore, if a diode or the like is used as the rectifier circuit 14 that rectifies the energy wave, the rectification effect will be improved;
1st harmonic is generated. Therefore, the second harmonic 2f generated by the rectifier circuit [4] is extracted by the bandpass filter 17 and given to the modulation circuit I8 as a carrier wave.

In this configuration, since the DC power generated by the interrogation signal wave, which has not been used in the past, is added to the DC power generated by the conventional energy wave and used as a drive power source, the power capacity increases by the amount due to the interrogation signal wave. Therefore, the response device 30
The distance over which AIE can communicate is longer than the conventional one. Furthermore, since the second harmonic generated by the rectification action in the rectifier circuit 14 that rectifies the energy wave is used as the carrier wave of the conversion circuit 18, the conventional multiplier circuit 16 can be omitted.

By the way, in the embodiment shown in FIG. 1, the response device 30 is individually provided with antennas I:1, 20 for energy waves and interrogation waves. For this purpose, it is sufficient to provide an antenna 13.20 that can receive the radio waves regardless of the polarization plane in which the energy wave and the interrogation signal wave are transmitted. If there is a specific relationship, it is possible to receive both using one antenna or i+F capability.

FIG. 2 is a block circuit diagram illustrating another embodiment of the radio receiving apparatus of the present invention in which a single antenna receives a cross-polarized energy wave and a horizontally polarized interrogation signal wave. In FIG. 2, circuit blocks that are the same or equivalent to those in FIG. 1 are given the same reference numerals and redundant explanations will be omitted.

In the second embodiment, the antenna 40 that can receive both the energy wave and the interrogation signal wave is formed of a rectangular bunch microstrip antenna. Then, the length of the vertical side of the rectangular patch is 2. is the % of the carrier wave f1 of the energy wave
The length 1□ of the side in the water≠ direction is set to the % wavelength of the carrier wave f2 of the interrogation signal wave. Furthermore, a feeder line 41 that outputs a horizontally polarized interrogation signal wave is formed and connected to the center of one side in the r% orthogonal direction of the rectangular patch using a microstrip line, etc., and is connected to the center of one side in the horizontal direction. , a feeder line 42 that outputs vertically polarized energy waves.
is connected. Then, the interrogation signal wave propagated through the feeder line 41 and outputted is rectified by the detection and rectification circuit 31,
The interrogation signal is demodulated from the bypass filter 22, and DC power is output from the low-pass filter 32. Also, the energy waves propagated through the feeder line 42 and outputted from the rectifier circuit 14
DC power is output from the low-pass filter 15.

In such a configuration, the energy wave and the interrogation signal wave can be received by one antenna 40, the space for arranging the antenna 40 is small, and it is easy to downsize the wireless receiving device of the present invention.

Further, if there is sufficient space to provide two antennas 13, 20 as shown in FIG. 1, two antennas 40 may be arranged in an array. If an array is used, the area of the antenna that can receive the energy wave and the interrogation signal wave will be doubled, and the output DC power will be increased accordingly.

FIG. 3 is a block circuit diagram illustrating still another embodiment of the radio receiving device of the present invention in which an energy wave and an interrogation signal wave of the same polarization plane at slightly different frequencies are received by one antenna. .

In FIG. 3, if the energy wave and the interrogation signal wave are both vertically polarized and have slightly different frequencies f,, f2, the antenna 50 is formed by a rectangular patch microst 21 tube antenna, and the vertical sides of the antenna 50 are The length 1' is set to % of the average value of the respective wavelengths of the carrier wave f1 of the energy wave and the carrier wave f2 of the interrogation signal wave. Further, a power supply line 51 is formed and connected to the center of one side of the rectangular patch in the horizontal direction using a microstrip line or the like. Roughly speaking, the energy wave and interrogation signal wave propagated through the feeder line 51 and output are rectified by one detection and rectification circuit 52, the interrogation signal is demodulated from the bypass filter 53, and the interrogation signal is demodulated by the low-pass filter 5.
DC power is output from 4.

In such a configuration, the space for arranging the antenna 50 may be small, and only one detection and rectification circuit 52 may be provided, resulting in a simple circuit configuration.

In addition, in most cases, the energy wave and the interrogation signal wave may be not only vertically polarized waves and horizontally polarized waves but also right-handed circularly polarized waves, left-handed circularly polarized waves, and the like.

(Effects of the Invention) Since the present invention is configured as described above, it produces effects as described below.

In addition to the DC power obtained by rectifying the carrier wave of the energy wave, (f
Since the DC power obtained by rectifying the carrier wave of the i''+ wave is also used as the drive power source, the power capacity of the drive power source increases, and the distance over which the signal can be properly received can be correspondingly increased.

Further, if energy waves and signal waves are received by one antenna, the space for the antenna becomes smaller and the device can be easily miniaturized.

Furthermore, if the energy wave and the signal wave are received by one antenna and outputted from one feeder line, only one rectifier circuit is required, which simplifies the circuit configuration.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram showing an overview of a system of a response device and an interrogation device in which an embodiment of the wireless receiving device of the present invention is used, and FIG. 2 shows a vertically polarized energy wave and a horizontally polarized energy wave. FIG. 3 is a block circuit diagram illustrating another embodiment of the wireless receiving device of the present invention in which interrogation signal waves of waves are received by one antenna; FIG. FIG. 4 is a block circuit diagram illustrating still another embodiment of the wireless receiving device of the present invention in which a single antenna receives a wave and an interrogation signal wave; FIG.
1 is a block circuit diagram showing an outline of a system including a conventional answering device and an interrogating device. 13.20, 40, 50: Antenna, I4: Rectifier circuit, 31.52: Detection and rectification circuit, 41.42, 51: Power supply line.

Claims (3)

[Claims] (1) In a radio receiving device that receives an energy wave and a signal wave respectively transmitted from a radio transmitting device using two carrier waves having different frequencies or planes of polarization, a first antenna that receives the energy wave; , a first rectifier circuit that rectifies the carrier wave of the energy wave received by the first antenna, a second antenna that receives the signal wave, and a first rectifier circuit that rectifies the carrier wave of the energy wave received by the first antenna; a second rectifier circuit that rectifies a carrier wave, and is configured such that both the DC power output from the first and second rectifier circuits are used as a driving power source for the radio receiving device. Wireless receiving device. (2) In a wireless receiving device that receives an energy wave and a signal wave respectively transmitted from a wireless transmitter using two carrier waves with different polarization planes, the energy wave and the signal wave are both received and outputted from separate feed lines. Let 1
a first rectifier circuit that rectifies the carrier wave of the energy wave output from the antenna, and a second rectifier circuit that rectifies the carrier wave of the signal wave output from the antenna.
rectifier circuit, and is configured so that DC power outputted from the first and second rectifier circuits are both used as a driving power source for the radio receiver. (3) In a wireless receiving device that receives an energy wave and a signal wave respectively transmitted from a wireless transmitter by two carrier waves with slightly different frequencies and the same polarization plane, the energy wave and the signal wave are both received on the same power feed line. and a rectifier circuit that rectifies both the energy wave and the carrier wave of the signal wave output from the antenna. A wireless receiving device characterized in that it is configured to be used as a driving power source.