KR100608491B1 - Power amplifier control method of portable internet time division duplexing antenna part - Google Patents

Abstract

The present invention relates to a method for controlling a power amplifier of a portable Internet time division duplex antenna stage, and an antenna stage thereof, and more particularly, to a base station, an access point, and a repeater constituting a time division duplex wireless communication network used for a portable internet. In the case of using a single antenna for the purpose of transmitting / receiving through a circulator, the transmission power is reflected to the receiving end by impedance mismatching of the antenna end, thereby preventing the receiving end from destroying the low noise amplifier. A method for controlling a power amplifier of a portable Internet time division duplex antenna stage for protection and an antenna stage thereof.

Antenna, Portable Internet, TDD, Time Division Duplex, Impedance Mismatch, Low Noise Amplifier

Description

Power amplifier control method of portable internet time division duplex antenna stage and its antenna stage {POWER AMPLIFIER CONTROL METHOD OF PORTABLE INTERNET TIME DIVISION DUPLEXING ANTENNA PART}             

1 is a view showing the configuration of a time division duplex antenna stage using a T / R switch according to the prior art.

2 is a view showing the configuration of a time division duplex antenna stage using a circulator according to the prior art.

3 is a diagram showing the configuration of a time division duplex antenna stage according to the first embodiment of the present invention;

4 is a diagram illustrating a configuration of a time division duplex antenna stage according to a second embodiment of the present invention.

5 is a view showing the configuration of a time division duplex antenna stage according to a third embodiment of the present invention.

6 is a view showing the configuration of a time division duplex antenna stage according to a fourth embodiment of the present invention.

7 is a flow diagram illustrating a method for controlling a power amplifier of a time division duplex antenna stage according to the present invention;

Explanation of symbols on the main parts of the drawings

100: antenna

110: low noise amplifier (LNA)

120: power amplifier (PA)

130: T / R switch (Transmitter / Receiver Switch)

140, 140 ': Circulator 150: Limiter

160: Dual Directional Coupler

160 ': Directional Coupler

160a: Coupling Port 160b: Isolation Port

170, 170 ': Peak Power Detector

180: OP Amp

190, 190 ': Coupling Capacitor

The present invention relates to a method for controlling a power amplifier of a portable Internet time division duplex antenna stage, and an antenna stage thereof, and more particularly, to a base station, an access point, and a repeater constituting a time division duplex wireless communication network used for a portable internet. In the case of using a single antenna for the purpose of transmitting / receiving through a circulator, the transmission power is reflected to the receiving end by impedance mismatching of the antenna end, thereby preventing the receiving end from destroying the low noise amplifier. A method for controlling a power amplifier of a portable Internet time division duplex antenna stage for protection and an antenna stage thereof.

Recently, wireless communication network has evolved from 3rd generation (3G) asynchronous wideband code division multiple access (CDMA) system that processes voice and video together in synchronous code division multiple access (CDMA) system mainly for voice calls. Furthermore, the Portable Internet technology, which enables users to access the Internet anytime and anywhere to obtain the necessary information by allowing them to use the Internet wirelessly while maintaining high speed mobility and high speed data transmission, has emerged as a major concern. Doing. The mobile Internet is now called Wi Bro, and service providers and equipment manufacturers form research groups to set international standards.

The wireless communication network used in the portable Internet commonly adopts the code division multiple access (CDMA) method, and the frequency division duplex (FDD) according to the division duplex (DD) method. ) And Time Division Duplex (TDD). Recently, with Orthogonal Frequency Division Multiplexing (OFDM) transmission scheme for processing high speed data while maintaining high mobility, time division duplexing (TDD) considering the frequency efficiency of the user The method is commercially available.

The frequency division duplex method is a full duplexer that transmits and receives frequency bands differently so that transmission and reception do not affect each other simultaneously. The frequency band is used but the transmission time is different so that it does not interfere with transmission and reception.

1 is a diagram illustrating a configuration of a time division duplex antenna stage using a T / R switch according to the prior art.

In a wireless communication network using a time division duplex method, one of the general methods for performing transmission and reception according to time division without affecting transmission and reception, respectively, is a T / R switch 130 which is a transmission / reception switch as shown in FIG. ) Is configured at the antenna stage.

The transmitting end is configured with a power amplifier (PA) for emitting a signal at a suitable maximum power through the antenna 100 to reach the electromagnetic wave to a desired place. In addition, since the signal received from the outside is not only very small in size, but also includes dirty noises caused by wireless communication, a low noise amplifier 110 for amplifying while minimizing noise is configured at the receiving end.

During the transmission period, the T / R switch 130 is connected to the transmitting end so that transmission power is transmitted through the antenna 100. At this time, the path of the receiving side is opened so that the transmission power of the transmitting end does not affect the receiving end. During the reception period, the transmitting end is opened, and the T / R switch 130 is connected to the receiving end to receive a receiving signal applied from the antenna 100.

Since the T / R switch 130 plays a role of transmitting transmission power and switching a transmission / reception path, P1dB (1dB gain compression point) indicating a linear maximum output power must be higher than the transmission power. Therefore, the switching operation time should be short because switching is necessary. According to the standard, base stations, access points, repeaters, etc., which constitute a wireless communication network using a time division duplex method such as a mobile Internet, require a transmission power of 43 dBm or more, and a switching time of 5 dB or less. T / R switch 130 must meet this specification. However, the conventional T / R switch 130 has a P1dB characteristic of about several hundred mW class, which is used in a portable terminal, and has a characteristic of P1dB of more than 43dBm of tens of W (Watt) and fast switching time within 5㎲. Since the T / R switch 130 has not been developed yet, it is inevitable to introduce another method in a base station, an access point, a repeater, or the like, which constitutes a wireless communication network used for the portable Internet.

2 is a view showing the configuration of a time division duplex antenna stage using a circulator according to the prior art.

In a wireless communication network using a time-division duplex method such as a portable Internet, another method of sharing a transmission / reception antenna is provided with a circulator 140 as shown in FIG. 2, by using the directionality of the circulator 140. Transmit and receive signals do not affect each other. The circulator 140, which is a three-terminal signal branch circuit element, has a shape in which three terminals are surrounded at an angle of 120 degrees, and magnetic bodies such as a resonance plate and a ferrite are disposed therein. Power is incident on one of the three terminals configured in the circulator 140, and only one of the other two terminals is output, and the other is not output. Thus, a three-terminal device transmits energy only to a terminal in a specific direction as if rotating in a directional manner.

As described above, the circulator 140 used to share the transmit / receive antenna has directionality to separate the transmit / receive signal without switching, and since a product having a high P1dB characteristic of 43 dBm or more is widely used. Circulator 140 is used to transmit and receive a large amount of power, such as a base station, an access point, and a repeater, constituting a wireless communication network using a time division duplex method that performs transmission and reception at different times by time division. There has been a tendency to share the antenna 100 to serve as reception.

However, in the wireless communication network using the circulator 140, all three terminals of the circulator 140 must be matched to the 50 ohm characteristic impedance to operate normally. When installing the antenna 100 to the base station or repeater, or when installing a coaxial cable to connect the antenna 100 and the repeater, often an antenna abnormality or a coaxial cable connection abnormality occurs. Accordingly, mis-matching of the antenna stage impedance occurs. When mismatching occurs in the antenna stage when the transmitting stage is turned on and transmits the transmission power, the transmission power is not radiated to the antenna stage and the circulator 140 is turned off. Through the receiver, it is received. Transmitted power input to the receiver is applied to the low noise amplifier 110 of the receiver. When tens of W (Watt) power of about 43 dBm is applied, a transistor in the low noise amplifier 110 is destroyed and service of the system is interrupted. Will be generated.

That is, when more than the voltage standing wave ratio (VSWR) occurs over the antenna end or the antenna feeder cable, the transmission power of the large output is reduced. As it is not transmitted to the antenna stage and reflected to the receiver through the circulator 140, a high power transmission signal is applied to the low noise amplifier 110 of the receiver to destroy the transistor in the low noise amplifier 110.

Accordingly, an object of the present invention is to solve the conventional problems as described above, and transmit and receive through a circulator in a base station, an access point, a repeater, etc. constituting a time-division duplex wireless communication network used for the portable Internet. In the case of using one antenna for sharing purposes, the portable Internet time division duplex for protecting the receiving end from the reflected power reflected wave by preventing the transmission power from being reflected to the receiving end and destroying the receiving low noise amplifier by impedance mismatching of the antenna end. The present invention provides a method for controlling a power amplifier of an antenna stage and an antenna stage thereof.

In order to achieve the above object, a time division duplex antenna stage according to a first embodiment of the present invention is an antenna stage used for a time division duplex wireless communication network, and includes a transmission / reception combined antenna 100 and the antenna ( Transmitter power amplifier 120 for radiating the transmission power to the outside through the 100, the receiver low noise amplifier 110 to which the received signal from the outside through the antenna 100 is applied, and the power amplifier 120 in the transmission period ) On and the low-noise amplifier 110 is turned off (Off) to transmit the transmission power, in the reception cycle the low-noise amplifier (110) On (On) and the power amplifier (120) Off (Off) A coupling terminal configured between the circulator 140 receiving the received signal and the antenna 100 and the circulator 140, and monitoring transmission power output in a forward direction through the antenna 100. 160a and above A bidirectional coupler 160 having a reverse coupling terminal 160b for monitoring the reflected wave power reflected from the tena 100 and a coupling terminal 160a and a reverse coupling terminal 160b of the bidirectional coupler 160, respectively. Two peak power detectors 170 and 170 'for detecting the applied transmission power and the reflected wave power and then applying the detected DC voltage to the op amp 180, and the peak power detectors 170 and 170'. After comparing the detected two DC voltages to obtain the voltage standing wave ratio, if the predetermined threshold value or more to generate an on-off control signal to turn off the power amplifier 120 instantaneously to cut off the output of the transmission power The op amp 180 is provided to protect the receiver low noise amplifier 110 by monitoring the transmitter transmit power and the reflected wave power.

The time-division duplex antenna stage according to the second embodiment of the present invention, in the antenna stage used in the time-division duplex wireless communication network, through the transmission and reception antenna 100 and the antenna 100 to the outside Transmitter power amplifier 120 for radiating transmit power, the receiver low noise amplifier 110 to which a received signal from the outside is applied through the antenna 100, and the power amplifier 120 is turned on in a transmission period And transmit the transmission power by turning off the low noise amplifier 110, and applying the received signal by turning on the low noise amplifier 110 and turning off the power amplifier 120 at a reception period. Coupler 160 having a receiving circulator 140 and a reverse coupling terminal 160b configured between the antenna 100 and the circulator 140 and monitoring only the reflected wave power reflected by the antenna 100. ') And the inverse of the coupler 160' After detecting the reflected wave power applied from the coupling terminal 160b, the peak power detector 170 'for applying the detected DC voltage to the op amp 180 and the DC voltage applied from the peak power detector 170' The op amp 180 generates an on / off control signal for temporarily turning off the power amplifier 120 for the reflected wave power beyond a predetermined DC offset value to block the output of the transmission power. It characterized in that to protect the receiver low noise amplifier 110 by monitoring the reflected wave power of the transmitter.

The time division duplex antenna stage according to the third embodiment of the present invention, in the antenna stage used in the time division duplex wireless communication network, transmits and receives both the antenna 100 and the outside through the antenna 100 Transmitter power amplifier 120 for radiating transmit power, the receiver low noise amplifier 110 to which the received signal from the outside through the antenna 100 is applied, and the power amplifier 120 is turned on in the transmission period And transmit the transmission power by turning off the low noise amplifier 110, and applying the received signal by turning on the low noise amplifier 110 and turning off the power amplifier 120 at a reception period. A coupling capacitor coupled between the receiving circulator 140, the point where the power amplifier 120 and the transmission terminal Tx of the circulator 140 are connected, and the peak power detector 170 to monitor forward transmission power. 190 and the low noise A coupling capacitor 190 'coupled between a point where the aeration 110 and the receiving terminal Rx of the circulator 140 is connected and the peak power detector 170', and the coupling capacitors 190 and 190 The peak power detectors 170 and 170 'respectively detecting the transmission power and the reflected wave power applied from') and applying the detected DC voltage to the op amp 180, respectively, and the peak power detectors 170, The voltage standing wave ratio is obtained by comparing the two detected DC voltages applied from 170 '), and when the voltage is greater than a predetermined threshold value, an on-off control signal for instantaneously turning off the power amplifier 120 is generated to transmit power. The op amp 180 to block the output of the transmitter is characterized in that to control the transmitter power amplifier 120 by comparing the transmit power and the reflected wave power.

The time division duplex antenna stage according to the fourth embodiment of the present invention, in the antenna stage used in the time division duplex wireless communication network, transmits / receives the combined antenna 100 and the outside through the antenna 100 Transmitter power amplifier 120 for radiating transmit power, the receiver low noise amplifier 110 to which a received signal from the outside is applied through the antenna 100, and the power amplifier 120 is turned on in a transmission period And transmit the transmission power by turning off the low noise amplifier 110 and applying the received signal by turning on the low noise amplifier 110 and turning off the power amplifier 120 at a reception period. Coupling capacitor 190 'coupled between the receiving circulator 140, the point at which the low noise amplifier 110 and the receiving terminal Rx of the circulator 140 are connected, and the peak power detector 170'. And applied from the coupling capacitor 190 ' After detecting the reflected wave power, the peak power detector 170 'for applying the detected DC voltage to the op amp 180 and the DC voltage applied from the peak power detector 170' are preset DC offsets. With respect to the reflected wave power beyond the threshold value), an op amp 180 which generates an on-off control signal that turns off the power amplifier 120 momentarily and cuts off the output of the transmit power has a transmit end reflected wave power measurement. It characterized in that for controlling the transmitting power amplifier 120 through.

Preferably, the peak power detectors 170 and 170 'are configured to be Schottky diodes so as to speed up a response signal for the reflected wave power measurement generated during mismatching of the antenna impedance.

In the method of controlling a power amplifier of a time division duplex antenna stage according to the present invention, a step (S100) of transmitting power from the power amplifier 120 to the circulator 140 and the circulator 140 in a transmission cycle (S110) emitting the transmit power through the antenna (100), and generating and monitoring the reflected wave power for the transmit power emitted through the antenna (100) due to impedance mismatching (S120 to S130); Step S140 of monitoring the power applied to the peak power detectors 170 and 170 ', and detecting a voltage of a DC level by detecting power applied to the peak power detectors 170 and 170' (S150). And, the detected DC voltage is applied to the op amp 180 (S160), the step of determining the mismatching impedance of the op amp 180 by a predetermined threshold value (S170) and the impedance If the mismatch of is greater than or equal to the threshold Group operational amplifier 180 is to generate an on-off control signal for instantaneously turned off by the power amplifier 120 is characterized in that comprises a step (S180) for blocking the output of the transmission power.

In the following description of the preferred embodiments of the present invention in detail with reference to the accompanying drawings, when it is determined that the detailed description of the related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Do it.

FIG. 3 is a diagram illustrating a configuration of a time division duplex antenna stage according to a first embodiment of the present invention, and illustrates a configuration of an antenna stage for protecting a receiver low noise amplifier 110 by monitoring a transmitter transmit power and a reflected wave power. It is.

3 shows two peak power detectors 170 and 170 having a bidirectional coupler 160 and a Schottky diode to control the power amplifier 120 by monitoring the reflected wave power in a time division duplex wireless communication network. ') Is used to monitor and detect the forward transmission power and the reflected wave power and compare the two detected DC voltages through the op amp 180 to obtain the reflected wave ratio, and if the threshold value is greater than or equal to the output of the op amp 180 An off signal is generated to control the power amplifier 120.

Between the antenna stage and the circulator 140, a bidirectional coupler 160 for monitoring the reflected wave power and two peak power detectors 170 and 170 'are provided to temporarily transmit the transmitter power amplifier 120 when the voltage standing wave ratio is abnormal. By turning off the transmission output, the high power output is not applied to the reception low noise amplifier 110, thereby protecting the reception low noise amplifier 110 from the reflected wave power of the high output of the transmission end.

The peak power detector 170 connected to the coupling terminal 160a by connecting the peak power detector 170 circuit to the coupling terminal 160a and the reverse coupling terminal 160b of the bidirectional coupler 160 is an antenna 100. The peak power detector 170 'connected to the reverse coupling terminal 160b of the bidirectional coupler 160 monitors the reflected wave power reflected from the antenna terminal.

When the antenna stage has an impedance match, the transmission power of the coupling loss is monitored at the coupling terminal 160a, and the reflected wave power is measured at the reverse coupling terminal 160b side. Can not.

In the case of mismatching of the impedance of the antenna terminal, the coupling terminal 160a monitors the transmission power to the antenna terminal, and the reverse coupling terminal 160b may measure the reflected wave power by the amount of mismatched impedance of the antenna 100. . The peak power detectors 170 and 170 'connected to the coupling terminal 160a and the reverse coupling terminal 160b respectively detect the power applied from the coupling terminal 160a and the reverse coupling terminal 160b with the Schottky diode. After that, the voltage output at the DC level is compared to the operational amplifier 180, and the output of the operational amplifier is used as an on-off control signal of the forward power amplifier 120.

In this case, the general diode uses a PN junction to operate at a forward turn-on voltage of about 0.6 to 0.7 V, whereas the Schottky diode is a rectifier using rectification by the Schottky barrier. It is a diode that enables high speed operation while minimizing power loss by lowering it to 0.2 ~ 0.3V. Typical examples include selenium ore detectors, silicon and gallium arsenide Schottky diodes, which are used in the past, and the current flowing through the Schottky diodes is represented by an exponential function of applied voltage, and has characteristics similar to those of semiconductor P-N junction diodes. It is suitable for high speed operation because the current control action is performed within a very narrow Schottky barrier.

When mismatching of antenna impedance is applied instantaneously to the receiving end, the reflected wave power is applied to the receiving end. Therefore, the Schottky diode is used to increase the response speed for the reflected wave power measurement. When the threshold value is higher than the threshold set for the amplifier 180, the power amplifier 120 is controlled on and off through the output of the op amp 180, thereby preventing the reflected wave power from being continuously applied to the receiver or in the form of an impulse. The reflected wave power is applied to the 110 to prevent the low noise amplifier 110 from being destroyed.

4 is a diagram illustrating a configuration of a time division duplex antenna stage according to a second embodiment of the present invention, and illustrates a configuration of an antenna stage for protecting a receiver low noise amplifier 110 by monitoring transmission power of reflected waves.

Referring to FIG. 4, the peak power detector 170 ′ using a Schottky diode is connected to the reverse coupling terminal 160 b of the coupler 160 ′, and only the reflected wave power is measured. In the op amp 180, a predetermined DC offset ( The configuration for generating the off signal for the reflected wave power above the threshold value by the value of DC Offset) to control the power amplifier 120 is shown.

A coupler 160 'and a peak power detector 170' are configured between the circulator 140 and the antenna stage, and the reflected wave power of the antenna stage is monitored by the peak power detector 170 'through the coupler 160'. When the reflected wave power is generated, an alarm signal and an on-off control signal for the transmitting end power amplifier 120 are generated instantaneously to turn off the power of the transmitting end power amplifier 120.

FIG. 5 is a diagram illustrating a configuration of a time division duplex antenna stage according to a third embodiment of the present invention, and using coupling capacitors 190 and 190 'instead of the bidirectional coupler 160, and transmitting stage transmission power and reflected wave power. Compared to the configuration of the antenna stage for controlling the power amplifier 120 is shown.

Referring to FIG. 5, a circuit such as a coupling capacitor 190 or a resistor is connected to monitor the transmission power between the transmission terminal power amplifier 120 and the transmission terminal Tx of the circulator 140. Transmitted power monitored through a circuit such as a coupling capacitor 190 or a resistor is detected as a direct voltage through a Schottky diode in the connected peak power detector 170.

A coupling capacitor 190 'or a resistor is also connected between the low noise amplifier 110 and the receiving terminal Rx to monitor the reflected wave of the transmission power. The reflected wave power monitored through a circuit such as a coupling capacitor 190 'or a resistor is detected by a Schottky diode in the connected peak power detector 170' and output as a DC voltage. The operational amplifier 180 calculates the voltage standing wave ratios of the transmission power and the reflected wave power corresponding to the forward power and the reflected wave power as two outputs detected by DC, and outputs an on / off control signal when the threshold value is higher than the power amplifier 120. By turning off, the receiver low noise amplifier 110 is protected from the reflected wave of the transmission power applied to the receiver due to the antenna stage impedance mismatch of the circulator 140.

FIG. 6 is a diagram illustrating a configuration of a time-division duplex antenna stage according to a fourth embodiment of the present invention. A coupling capacitor 190 'is applied instead of the coupler 160', and a power amplifier is measured by measuring the reflected wave power of the transmitter. The configuration of the antenna stage for controlling 120 is shown.

Referring to FIG. 6, the reflected wave of the transmission power is monitored by connecting a coupling capacitor 190 ′ or a resistor having a predetermined capacity between the reception terminal Rx of the circulator 140 and the low noise amplifier 110. The monitored reflected wave power is detected as a direct current voltage through a Schottky diode in the peak power detector 170 '. The op amp 180 having a specified threshold outputs an on / off control signal that turns off the power amplifier 120 instantaneously when the detected DC voltage is greater than or equal to the threshold, thereby cutting off the output of the transmission power. To protect.

7 is a flowchart illustrating a method for controlling a power amplifier of a time division duplex antenna stage according to the present invention.

Referring to FIG. 7, in the method of controlling a power amplifier of a time division duplex antenna stage according to the present invention, a step (S100) of transmitting power from the power amplifier 120 to the circulator 140 and the circulator 140 is performed. Step S110 of transmitting the transmission power through the antenna 100 in the transmission period, and the reflected wave power of the transmission power emitted through the antenna 100 due to impedance mismatching is generated and monitored (S120 to S130), the monitored power is applied to the peak power detectors 170 and 170 '(S140), and the power applied to the peak power detectors 170 and 170' is detected to detect a DC level voltage. (S150), the step of applying the detected DC voltage to the op amp 180 (S160), the step of determining the degree of mismatching the impedance of the op amp 180 by a predetermined threshold value (S170) and If the mismatch of the impedance is above the threshold, Program 180 is to generate an on-off control signal to turn-off in order for the power amplifier 120 is made explicitly to such step (S180) for blocking the output of the transmission power.

The power amplifier control method of the time division duplex antenna stage of FIG. 7 is performed through the antenna stage of FIGS. 3 to 6.

In the step S120 to S130 where the reflected wave power is generated and monitored for the transmission power emitted through the antenna 100 due to impedance mismatching, the bidirectional coupler 160 monitoring the forward transmission power and the reflected wave power, respectively (FIG. 3) or coupling capacitors 190 and 190 '(FIG. 5), coupler 160' (FIG. 4) or coupling capacitor 190 'or resistor (FIG. 6) monitoring only the reflected wave power. Is made through).

In step S170 and the on-off control signal generation step S180, the op amp 180 determines an impedance mismatch by a predetermined threshold value, as shown in FIG. 3 and FIG. 5. When all of them are monitored and detected with a DC voltage, the operational amplifier 180 compares the two detected DC voltages, obtains a voltage standing wave ratio, and then turns off the power amplifier 120 when the voltage amplifier is above a predetermined threshold value. 4 and 6, when only the reflected wave power is monitored and detected as the DC voltage, the power of the reflected wave power above the threshold that falls within a range in which the DC voltage detected by the op amp 180 is outside the predetermined DC offset value is applied. The amplifier 120 is turned off.

The present invention may be modified in various ways without departing from the basic concept according to the needs of those skilled in the art.

As described above, according to the present invention, a base station, an access point, a repeater, or the like, which constitutes a time-division duplex wireless communication network used for a mobile Internet, uses one antenna for transmission / reception sharing through a circulator. In this case, a method of controlling the power amplifier of a portable Internet time division duplex antenna stage for protecting the receiver from the reflected power reflected wave by preventing transmission power from being reflected to the receiver and destroying the receiver low noise amplifier by impedance mismatching of the antenna stage. There is an effect that the antenna stage is provided.

Claims (9)

In the antenna stage used for the time division duplex wireless communication network, Transmitting and receiving antenna (100); A transmitter power amplifier 120 radiating transmit power to the outside through the antenna 100; A receiver low noise amplifier (110) to which a received signal from the outside is applied through the antenna (100); In the transmission cycle, the power amplifier 120 is turned on and the low noise amplifier 110 is turned off to transmit the transmission power, and in the reception cycle, the low noise amplifier 110 is turned on and the power is turned on. A circulator 140 for turning off the amplifier 120 and receiving a received signal; A coupling terminal 160a configured between the antenna 100 and the circulator 140 and monitoring transmission power output in a forward direction through the antenna 100 and reflected wave power reflected from the antenna 100. Bidirectional coupler 160 having a reverse coupling terminal 160b for monitoring the; Two peaks respectively detecting the transmission power and the reflected wave power applied from the coupling terminal 160a and the reverse coupling terminal 160b of the bidirectional coupler 160 and applying the detected DC voltage to the op amp 180, respectively. Power detectors 170 and 170 '; Comparing the two detected DC voltages applied from the peak power detectors 170 and 170 'to obtain a voltage standing wave ratio, and when the predetermined power is greater than or equal to a predetermined threshold, the power amplifier 120 is turned on and off instantaneously. The op amp 180 generating a control signal to block the output of the transmission power; and a time division duplex antenna stage, which protects the receiver low noise amplifier 110 by monitoring the transmitter transmission power and the reflected wave power. . In the antenna stage used for the time division duplex wireless communication network, Transmitting and receiving antenna (100); A transmitter power amplifier 120 radiating transmit power to the outside through the antenna 100; A receiver low noise amplifier (110) to which a received signal from the outside is applied through the antenna (100); In the transmission cycle, the power amplifier 120 is turned on and the low noise amplifier 110 is turned off to transmit the transmission power, and in the reception cycle, the low noise amplifier 110 is turned on and the power is turned on. A circulator 140 for turning off the amplifier 120 and receiving a received signal; A coupler (160 ') configured between the antenna (100) and the circulator (140) and having a reverse coupling terminal (160b) for monitoring only the reflected wave power reflected by the antenna (100); A peak power detector 170 'that detects reflected wave power applied from the reverse coupling terminal 160b of the coupler 160' and then applies the detected DC voltage to the op amp 180; For reflected wave power above a threshold value at which the DC voltage applied from the peak power detector 170 'is outside the predetermined DC Offset value, an on-off control signal for temporarily turning off the power amplifier 120 is provided. And an op amp (180) for generating output to block the output of the transmission power. The time division duplex antenna stage comprising: protecting the receiver low noise amplifier (110) by monitoring the transmitter reflected wave power. In the antenna stage used for the time division duplex wireless communication network, Transmitting and receiving antenna (100); A transmitter power amplifier 120 radiating transmit power to the outside through the antenna 100; A receiver low noise amplifier (110) to which a received signal from the outside is applied through the antenna (100); In the transmission cycle, the power amplifier 120 is turned on and the low noise amplifier 110 is turned off to transmit the transmission power, and in the reception cycle, the low noise amplifier 110 is turned on and the power is turned on. A circulator 140 for turning off the amplifier 120 and receiving a received signal; Coupling capacitor 190 and the low noise amplifier coupled to the point between the power amplifier 120 and the transmission terminal (Tx) of the circulator 140 and the peak power detector 170 to monitor the forward transmission power ( A coupling capacitor 190 'coupled between the point at which the receiving terminal Rx of the circulator 140 is connected and the peak power detector 170'; Two peak power detectors 170 and 170 'that detect the transmission power and the reflected wave power applied from the coupling capacitors 190 and 190' and then apply the detected DC voltages to the op amps 180, respectively; Comparing the two detected DC voltages applied from the peak power detectors 170 and 170 'to obtain a voltage standing wave ratio, and when the predetermined power is greater than or equal to a predetermined threshold, the power amplifier 120 is turned on and off instantaneously. The op amp 180 generating a control signal to block the output of the transmission power; and a time division duplex antenna stage comprising controlling the transmitter power amplifier 120 by comparing the transmitter transmit power and the reflected wave power. . In the antenna stage used for the time division duplex wireless communication network, Transmitting and receiving antenna (100); A transmitter power amplifier 120 radiating transmit power to the outside through the antenna 100; A receiver low noise amplifier (110) to which a received signal from the outside is applied through the antenna (100); In the transmission cycle, the power amplifier 120 is turned on and the low noise amplifier 110 is turned off to transmit the transmission power, and in the reception cycle, the low noise amplifier 110 is turned on and the power is turned on. A circulator 140 for turning off the amplifier 120 and receiving a received signal; A coupling capacitor 190 'coupled between a point at which the low noise amplifier 110 and the receiving terminal Rx of the circulator 140 are connected and the peak power detector 170'; The peak power detector 170 'that detects the reflected wave power applied from the coupling capacitor 190' and then applies the detected direct current voltage to the op amp 180; For reflected wave power above a threshold value at which the DC voltage applied from the peak power detector 170 'is outside the predetermined DC Offset value, an on-off control signal for temporarily turning off the power amplifier 120 is provided. And an op amp (180) generating and blocking the output of the transmission power. The time division duplex antenna stage comprising controlling the transmitter power amplifier 120 through the measurement of the transmitter reflected wave power. The method according to any one of claims 1 to 4, The peak power detectors 170 and 170 ', A time division duplex antenna stage, comprising: a Schottky diode configured to speed up a response signal for reflection wave power measurement generated during mismatching of antenna impedance. Outputting transmission power from the power amplifier 120 to the circulator 140 (S100); The circulator 140 discharging transmission power through the antenna 100 in a transmission period (S110); Generating and monitoring reflected wave power with respect to the transmission power emitted through the antenna 100 due to impedance mismatching (S120 to S130); The monitored power is applied to the peak power detectors 170 and 170 '(S140); Detecting power applied to the peak power detectors 170 and 170 'to detect a DC level voltage (S150); Applying the detected DC voltage to the operational amplifier 180 (S160); Determining, by the op amp, the impedance mismatched by a predetermined threshold value (S170); If the mismatching degree of the impedance is greater than or equal to a threshold value, the op amp 180 generates an on / off control signal for temporarily turning off the power amplifier 120 to block the output of the transmission power (S180); A power amplifier control method for a time division duplex antenna stage, comprising: a. The method of claim 6, In the step S120 to S130 where the reflected wave power is generated and monitored for the transmission power emitted through the antenna 100 due to the impedance mismatching, the bidirectional coupler 160 or the couple that monitors the forward transmission power and the reflected wave power respectively. Power of the time-division duplex antenna stage, which is made through at least one of the ring capacitors 190 and 190 ', the coupler 160' which monitors only the reflected wave power, or the coupling capacitor 190 'or the resistor. Amplifier control method. The method of claim 6, In step S170 and the on-off control signal generation step S180, the op amp 180 determines whether the impedance is mismatched based on a predetermined threshold value, and both the transmitting end transmission power and the reflected wave power are monitored to provide a DC voltage. And the op amp 180 compares the two detected DC voltages to obtain a voltage standing wave ratio, and then, when the op amp 180 is above a predetermined threshold value, turns off the power amplifier 120. Power amplifier control method of antenna stage. The method of claim 6, In step S170 and the on-off control signal generation step S180, the op amp 180 determines whether the impedance is mismatched by a predetermined threshold value, and only the reflected wave power is monitored to detect a DC voltage. The time-division duplex antenna stage is characterized in that the op amp 180 turns off the power amplifier 120 for the reflected wave power above a threshold value within a range in which the detected DC voltage is outside the predetermined DC offset value. Power amplifier control method.

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