KR19990046330A - A wireless handset for mobile personal communication terminals and radio transceivers - Google Patents

Abstract

The present invention relates to personal mobile communication terminals or portable and vehicle radios. Mobile radios generally use relatively large and heavy radios by carrying a body with a radio transmitter and antenna (hereinafter referred to as a "radio") with one hand and making close contact with the ears and mouth to the radio. There is discomfort to take out the body by hand. In addition, since an antenna that radiates radio wave energy of 1 watt or more transmit power is close to the brain portion, electromagnetic waves are absorbed by the human body, especially the brain, and thus the temperature inside the brain rises, which is harmful to the body.

In order to solve the above problems at the same time, a small pen-shaped remote wireless handset set is created, and there are a few milliwatts (mW) of bi-directional mini transceiver circuit and body which are less than one hundredth of the transmission power of earphone, microphone, and radio body inside. It has a small antenna facing down. In addition, the main body of the mobile radio is equipped with a fixed adapter capable of ultra close radio communication with the remote radio handset in front, and a bidirectional mini transceiver circuit and a small pattern antenna having a transmission power of several mW or less and a small pattern antenna are embedded therein. A so-called wireless remote handset device is constructed by connecting to a handset and a communication control switch jack.

In this way, when using a mobile radio such as a cellular phone, the main radio of the main radio does not need to be taken out and held in the hand or in close contact with the head. It is possible to make a call to solve the problem of convenience and harmful effects of electromagnetic waves.

Description

AWIRELESS HANDSET FOR MOBILE PERSONAL COMMUNICATION TERMINALS AND RADIO TRANSCEIVERS}

When using a mobile radio such as a mobile phone or a walkie talkie, hold the radio in one hand and hold the ear and mouth close to the radio to communicate. There was this. In addition, due to the proximity of the brain to an antenna that radiates radio wave energy of more than 1 watt of transmit power, the human body, especially the brain, absorbs electromagnetic energy, which raises the temperature inside the brain, which causes the harmful effects of electromagnetic waves. I had.

Conventionally, in order to solve this problem, there was only a method of using an earphone, a microphone, and a call manipulation switch by wire to an external handset connection port of a mobile communication device, but this was inconvenient because a cord wire was connected between a main body and a remote device. .

When carrying out mobile wireless communication, it is an object of the present invention to remove the bulky and heavy radio body by hand, and to eliminate the inconvenience of hand-held communication. In addition, especially when the radio body is close to the mouth and close to the ear to communicate, the antenna radiating transmit radio wave output energy is close to the brain, whereby electromagnetic energy is absorbed by the human body, especially the brain, and the temperature inside the brain rises. It is another object of the present invention to remove the cause of harm to the human body. The human health problem of mobile phones has already been published in October 1996 in the IEEE Transactions on Microwave Theory and Techniques (Volume 44), a special issue on high frequency / microwave medical applications and biological effects by the Institute of Electrical and Electronics Engineers (IEEE). It is published in several papers.

1 is an installation diagram of the present invention actually applied to a mobile phone or a mobile radio 1. Fig. 2 is a structural diagram showing an example of the remote radio handset 3 and the remote wired handset 4 of the apparatus of the present invention. 3 is a structural diagram showing an example of the fixed adapter 2 in the apparatus of the present invention. 4 is a complete block diagram of the inventive device. Fig. 5 is an example of a circuit diagram for implementing the remote radio handset 3 of the apparatus of the present invention. Fig. 6 is an example of a circuit diagram in which the fixed adapter 2 of the device of the present invention is implemented.

In the present invention, to solve the above two problems at the same time to make a small pen-shaped remote wireless handset, a two-way mini transceiver circuit with a few mW output of less than one-hundredth of the transmission power of the earphone, microphone, and mobile radio in the body And a small antenna facing down the body. In addition, the main body of the mobile radio (main radio) has a fixed adapter (2) capable of ultra-near radio communication with the preceding small remote wireless handset (3), and therein a bidirectional mini transceiver circuit having a transmission power of several mW or less. And remote control handset of mobile phone and mobile radio by connecting the connector to handset and communication control switch jack of main radio main body by making device with built-in device such as small pattern antenna. .

1 is an actual installation diagram to which the apparatus of the present invention is applied, and a fixed adapter 2 is attached to a lower portion of a rear side of a conventional cellular phone or a walkie talkie 1 and a plug is attached to a connector or a handset connector for connecting an accessory device. In addition, the pen-type remote radio handset 3 is carried separately to show the overall configuration of a device capable of performing communication remotely.

FIG. 2 is a structural diagram showing an example of the remote radio handset 3 and the remote wired handset 4 of the present invention. (5) is a handset (earphone), (6) is a handset (microphone), (7) is an antenna, (8) is a talk button switch, and (9) is fitted with an external hands-free set Jack (10) is a lid that can be opened to replace the battery, (11) is inside, the power switch is a micro switch for interlocking operation when the antenna is removed, (12) the internal transceiver circuit Substrate 13 is a dry cell. Also, in the remote wired handset 4, 14 and 15 are cords and plugs for wired connection to a mobile phone or a mobile radio body, respectively. The remote wired handset 4 is assembled with only the telephone switch 8 for the call, the handset 6 and the handset 5 inside a case such as a fountain pen, and is fixed with a remote wired handset that makes a cord 14 and directly connects to the mobile phone body. It is a simple structure that does not require an adapter (2).

Figure 3 is a structural diagram showing an example of a fixed adapter (2) attached to the main body of a mobile phone or a walkie-talkie of the device according to the present invention, 16 is a power switch on the side, 17 is a transceiver circuit therein The board (18) is a plug for connecting to the mobile phone main handset jack, (19) is a female connector for connecting to the male connector of the mobile phone if necessary, (20) is a lid of the battery compartment, (21) is a plug of the plug The groove for fitting in use, 22, is a hole for fitting when the plug 18 is not in use, and 23 is a detachable cloth (also known as a squeaker) bonded to the mobile phone main body so that it can be attached and detached.

Figure 4 is a complete block diagram of the apparatus of the present invention, each one by one description (1) is a conventional mobile phone or radio, (2) a fixed adapter portion, (3) a remote wireless handset portion, (28) separately Hands free kit 35, which can be fitted to the jack 9, represents the jack on the body of the mobile phone that fits the plug 18 of the fixed adapter 2.

Referring to the operation principle of the remote radio handset 3, the signal of the frequency f2 received from the antenna 7 enters the receiving circuit 25 through the diplexer 24 and is demodulated or detected by voice to be received by the handset 5. You can hear the incoming voice. In addition, the voice signal, which is referred to as the handset 6 of the remote handset, is modulated by the frequency f1 radio wave in the transmission circuit 26, and is emitted as the transmission radio wave from the antenna 7 through the diplexer 24, so that the fixed adapter 2 Is sent to the receiver. If a cellular phone call is received from outside and the call is pushed, the voice button is momentarily pressed to generate a voice tone, which is modulated and transmitted.

On the other hand, the operation principle of the part of the fixed adapter (2) which is attached to the mobile phone and communicates with the remote radio handset (3) described above, the received signal of the frequency f1 received through the receiving antenna 30 is connected to the receiver circuit (31). The voice is transmitted through the plug 18 and the jack 35 to enter the main body of the mobile phone and transmitted to the communication counterpart. The voice signal received from the mobile phone is also input through the jack 35 and the plug 18, modulated by the transmitter circuit 32 into a radio wave of frequency f2, and transmitted to the remote radio handset 3 via the transmission antenna 29. It is sent out. If the voice tone is received by the fixed adapter 2 by pressing the button of the telephone switch 8 on the remote radio handset 3 side, since the tone waveform is present in the demodulation signal of the receiver circuit 31, the output of the tone decoder 33 is output. The DC voltage is generated in the relay 34 is operated and the contact is short-circuited, so the remote call operation is also possible by operating the call switch of the mobile phone via the plug 18 and the jack 35.

Fig. 5 is an example of a circuit diagram for implementing the remote radio handset 3 of the apparatus of the present invention. Detailed description of the circuit is as follows. First, the signal received at the antenna enters the filter FL2 through the antenna extension coil L4 and the condenser C15. Here, the part inside the dotted line composed of the filters FL1, FL2, and C14, C15, L5 is called a diplexer, which is a device for transmitting and receiving at the same time by using one antenna. Pass and receive frequency f2 suppresses the pass, filter FL2, on the contrary, passes the receive frequency f2 and cuts off the transmit frequency f1 so that the transmit and receive frequencies of f1 and f2 separated by several MHz or more from each other do not interfere with each other. It serves to separate.

The received signal entering FL2 selects only the received frequency in the resonant circuit composed of L6 and C16 and enters the gate-effect amplification field effect transistor (J-FET) Q5 for high frequency amplification. R14 is a bias setting resistor and C17 is a large bypass capacitor. The drain output voltage of Q5 is passed through the resonant load circuit of L7 and C18 to the next stage Q6 through the coupling capacitor C19. The receiver of the device of the present invention may be implemented by a super-heterodyne method having excellent reception sensitivity or selectivity, direct conversion, or an autodyne method with a simple circuit. The communication is performed only at close range and the size should be small, so the example of using the super regenerative detection method, which is a simple circuit structure and a sensitive method, is shown.

In other words, the Q6 circuit is amplified by Q6 through the coupling capacitor C21 at the input side resonant circuit L8, C20, and then amplified by Q6, and then passes through the C26 tank circuit L9, C24, C25, and then through C26. A part of the collector resonant circuit output signal is fed back to the base of Q6 via R15. At this time, if R15 is adjusted gradually and decreases, positive feedback gradually increases and later oscillation occurs. The super regenerative detection method is a classical receiver circuit method that makes this positive feedback state that the amplifier has just started oscillating, thus increasing sensitivity and detecting or demodulating with a simple circuit configuration. Since C25 is a larger RF bypass capacitor than C24, the resonance is almost determined by the values of L9 and C24. The super-play detected voice signal is the audio received through the low frequency amplifier circuit of Q7 and IC1 to the earphone or external speaker SP1.

Next, the operation of the transmission part is as follows. The transmitter is a circuit section consisting of Q1, Q2, Q3, Q4 and IC3, where Q1 is the microphone voice amplifier stage, Q2 is the oscillator stage, Q3 is the frequency multiplier stage, and Q4 is the output amplifier stage. The audio signal from the microphone or the talker is amplified by entering the base of the voice amplifier Q1 via the condenser C1. Where R2 is the collector load resistor and R3 is the base bias resistor.

The oscillation circuit constitutes a Pierce GS oscillation circuit using X1 and Q2 representing a crystal oscillator or SAW resonator (or ceramic resonator). The oscillation frequency is the total inductance value of X1 and L1, VC1, C4 and C5 Determined by the capacitance value. L1 is a variable inductance coil for fine adjustment of the transmission frequency, and VC1 is a variable capacitance diode (varicap) for frequency modulation in the oscillation stage according to the DC component voltage change of the voice signal voltage. The apparatus of the present invention can be implemented by either AM modulation or FM modulation, but this circuit example shows the FM transmission. R7 and R6 properly set the DC operating bias voltage of the varicap, and R4 and R25 provide high impedance isolation between the high frequency oscillation reactance circuit and the voice modulation amplifier stage.

The oscillated and modulated high frequency signal is supplied to the base of the next multiplication stage Q3 through C7 in a source follower manner. R10, R11 and R12 set the bias of Q3 and C10 is the high frequency bypass capacitor. On the collector output side of Q3, select the desired harmonics by L2 and C9, input them to the base of Q4 through C11, perform final amplification, resonate with the transmission frequency by L3, C12, C13, and match the impedance of diplexer FL1 circuit with impedance. Let.

In addition, Q8 and its peripheral circuits are phase shifting voice tone oscillators that generate a sinusoidal wave of about 1500 Hz. When the button switch S2 is pressed, a tone is generated and the voltage of VC1 is modulated and transmitted by controlling the voltage of VC1 through C35 and R25. When the receiver detects this tone, the receiver of the fixed adapter 2, which is the communication partner, provides a function of remotely operating the call operation switch of the mobile phone or the radio by using the relay. R25, R26, R27, C36, C37, and C38 all determine the oscillation frequency for phase shift feedback, R28 sets the tone level, R23 is the collector load resistance, R24 and C39 are the bias resistor and bypass capacitor to be. In this example, a single tone is shown, but a dual tone generator can be used to operate two switches or to use a dual tone multi frequency (DTMF) dial and ARS function of a general telephone. In addition, S1 is a power switch and C16, C15, C30 and the like are power supply decoupling capacitors.

FIG. 6 is an example of a circuit diagram of the fixed adapter 2 of the apparatus of the present invention. Since most circuits are the same as those of FIG. 5, description thereof is omitted. Transmitting and receiving antennas were installed separately as pattern antennas or patch antennas without using the diplexer portions in the dotted lines composed of the filters FL1, FL2, and C14, C15, and L5. In addition, a portion of the phase shifting voice tone oscillator circuit composed of Q8 of Fig. 5 and its peripheral circuits is deleted, and a tone decoder circuit for detecting the incoming tone signal generated therein is added. In other words, part of the voice detection output signal from the coupling capacitor C27 enters the IC2 via R21. IC2 is an integrated circuit for tone decoder, which is a popular brand name NE567 or the like, and detects only the voice frequency components determined by R22 and C32. . Therefore, it is necessary to adjust R22 so that the same frequency as the phase shift oscillation frequency determined by R25, R26, R27 and C36, C37, C38 in FIG. 5 is detected. The operation principle of this circuit part will be described in detail as follows. When the audio signal coming from R21 is limited in amplitude by diodes D1 and D2 and input to IC2 via C31, when the tone signal of the voice signal is received from the radio remote handset 3 inside this integrated circuit, the frequency of this tone is increased. Only when the frequency set by R22 and C32 (usually around 1500Hz), output terminal 8 of IC2 is grounded and relay RL1 operates. Therefore, by connecting the contact output of RL1 to the call switch terminal of the mobile phone, the remote control can be operated when the mobile phone is called. 6 shows an example of a single tone control method using one IC2, but using two IC2 circuits acts as a dual tone decoder to operate two switches or a conventional telephone. It can also function as a DTMF dial or ARS.

By using the apparatus of the present invention, when using a mobile radio such as a mobile phone, there is no need to take out the main body of the main radio and keep it in a bag, a pocket, or a belt without having to hold the main radio in hand or close to the head. Easily take out a small remote wireless handset such as a fountain pen or a remote wired handset to make a phone call, which provides convenience and the ability to solve harmful electromagnetic problems.

Claims (2)

Wireless remote handset for wireless control and handset transmission and reception of mobile phones or mobile radios Fountain pen-type wired handset that can remotely control and handset transmission and reception of mobile phones or mobile radios.