JPS6216032Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a tuning instruction device for an antenna tuner provided between a transmitter and an antenna.

Conventionally, the tuning instruction device of the antenna tuner is
As shown in the figure, the standing wave ratio on the connection line between the transmitter 1 and the antenna tuner 2, such as a π-type matching circuit, is detected by the standing wave ratio detection circuit 3. It was configured so that the output of the output was indicated by an indicator 4. 5 is an antenna.

Therefore, the tuning operation of the antenna tuner 2 has been performed by adjusting the variable reactances 2' and 2 of the antenna tuner 2 so that the indication from the indicator 4 is minimized.

However, the two variable reactances 2' and 2'' of the antenna tuner and the indicator's indication are intricately related, and the above adjustment is based on a single element obtained from one indicator 4 that indicates the standing wave ratio. The information, moreover, the indicator requires a two-way operation to adjust the two variable reactances 2' and 2'' of the antenna tuner in response to the one-way information that swings only in the positive direction, and the tuning adjustment operation of the antenna tuner is difficult. There were also problems that required skill.

The present invention has been made in view of the above, and it is an object of the present invention to provide a tuning instruction device for an antenna tuner that solves the above problems and facilitates the tuning adjustment operation of the antenna tuner.

The present invention will be explained below with reference to examples.

FIG. 2 is a block diagram of one embodiment of the present invention.

6 is a voltage detection circuit that detects the voltage at one point P on the connection line between the transmitter 1 and the antenna tuner 2, and the voltage detection circuit 6 has a voltage proportional to the detected voltage v and the amplitude E of the voltage v. It outputs the voltage V'. 7
is a current detection circuit that detects the current at point P, and the current detection circuit 7 outputs the detected current i and a voltage V'' proportional to the amplitude I of the current i.The output voltage V' of the voltage detection circuit 6 is The output voltage V'' of the current detection circuit 7 is input to an amplitude difference detection means, for example, a subtraction circuit 8, and the subtraction circuit 8 obtains a voltage V proportional to the amplitude difference between both inputs. It is configured to input V to the center zero indicator 10 and give an instruction.

On the other hand, the output voltage v of the voltage detection circuit 6 and the output current i of the current detection circuit 7 are input to a phase difference detection circuit 9, and a voltage V proportional to the phase difference between both inputs is obtained by the phase difference detection circuit 9. The configuration is such that the output voltage V obtained from the phase difference detection circuit 9 is input to the center zero indicator 11 to give an indication.

Next, the operation of this embodiment configured as described above will be explained.

Assuming that the impedance when looking at the antenna tuner 2 side from point P is Z=Zεj, and all the connection lines from the transmitter 1 to the antenna tuner 2 have this impedance Z, then the impedance Z
is the load impedance of the transmitter 1.

In general, the optimal load impedance of transmitter 1 Z ₀
is often a pure resistance of about 50Ω to 75Ω, and Z=
The antenna tuner 2 is adjusted so that Z ₀ =0.

Now voltage v = Eεj ₁ at point P, current i = Iε
When j is ₂ , the impedance Z is Z〓=Zεj
Therefore, since Z=v/i, Zεj=E/Iεj ( ₁ − ₂ ), and therefore E=I・Z= ₁ − ₂ .

In addition, the output voltage output from the voltage detection circuit 6
V′ is V′=K ₁ E, and the output voltage V″ output from the current detection circuit 7 is V″=K ₂ I. Here, K ₁ is the gain of the voltage detection circuit 6. Further, K ₂ is the voltage conversion gain of the current detection circuit 7 and has the dimension of resistance.

Therefore, the output voltage V of the subtraction circuit 8 is V=V'-V'' (or V''-V') = _K1 (E- _K2 / _K1 I) = _K1 I(Z- _K2 / _K1 ) becomes.

Now, if we select so that K ₂ /K ₁ =Z ₀ , then V=K ₁ I(Z-Z ₀ )...(1).

On the other hand, _the equivalent circuit of the transmitter 1 is as shown in Fig. ₃ , where the equivalent power supply voltage of the transmitter 1 is represented by _E +Z), and equation (1) becomes V=K ₁ EZ−Z ₀ /Z+Z ₀ . The reactance component of impedance Z is zero (if the reactance component is not zero, it will be as shown in the attached sheet) Therefore, when Z=Z ₀ , V=0, and when Z=∞, V
= K ₁ E, and when Z = 0, V = -K ₁ E, so if the antenna tuner 2 is adjusted so that the indication of the indicator 10 is at the center, that is, zero, the above-mentioned Z = Z ₀ . .

Next, in the phase difference detection circuit 9, the voltage v,
Phase difference detection of the current i is performed, and the output voltage V of the phase difference detection circuit 9 is V=K ₃ (∠v−∠i) or K ₃ (∠i−∠
v) = K ₃ ( ₁ - ₂ ) = K ₃ ∆. Here, K ₃ is the gain of the phase difference detection circuit 9.

Therefore, the output voltage V of the phase difference detection circuit 9 =
K ₃・Δ corresponds to the phase component of the impedance at point P, and in order to make it = 0, V
The antenna tuner 2 may be adjusted so that =0. By adjusting in this way, the condition that the reactance of Z assumed to be zero when adjusting so that V=0 as described above is satisfied.

When changing the two variable reactances of the antenna tuner 2, the indications of the indicators 10 and 11 are intricately related to each other, and even if the variable reactance of the antenna tuner 2 is changed, the indications of the indicators 10 and 11 are Although the instructions change, as described above, when adjusting the antenna tuner 2 so that Z=Z ₀ , =0, the two of the antenna tuner 2 is adjusted based on the binary information from the indicators 10 and 11. This is a two-way operation for adjusting two variable reactances, and the antenna tuner tuning operation is much easier than in the past.

Next, other embodiments of the present invention will be described.

FIG. 4 is a block diagram of another embodiment of the present invention, in which the same components as in the embodiment of the present invention shown in FIG. 2 are given the same reference numerals.

In the tuning instruction device of this embodiment, in addition to the embodiment of the present invention shown in FIG.
and between the output terminal of the current detection circuit 7 that outputs the current i and the phase difference detection circuit 9, respectively, inserting AC limiters 13 and 14 separately,
Additionally, an adder circuit 15 for adding the output voltage V' of the voltage detection circuit 6 and the output voltage V'' of the current detection circuit 7 is connected, and the output voltage V of the subtraction circuit 8 is added to the adder circuit 1.
A divider circuit 16 that divides by the output voltage of 5 is inserted between the subtracter circuit 8 and the indicator 10, and the amplitude difference is obtained by the subtracter circuit 8, the adder circuit 15, and the divider circuit 16, and the output voltage of the divider circuit 16 is is configured to be indicated by an indicator 10.

Therefore, the operation of this embodiment is essentially the same as that of the embodiment of the present invention, but the equivalent power supply voltage E _X of the transmitter 1 changes depending on the output of the transmitter 1. Therefore, the output voltage V' of the voltage detection circuit 6 and the output voltage of the current detection circuit 7 are calculated by the adder circuit 15.
The output voltage V ₁ = (V'-V'') of the subtraction circuit 8 is divided by the output voltage (V'+V'') of the addition circuit 15 by the division circuit 16. After division, the output voltage V' of the divider circuit 16 becomes V' = (V' - V'') / (V' + V''), where V' is a value responsive to the amplitude difference, and -1≦V'≦+1. Therefore, the instruction from the indicator 10 is no longer influenced by the output from the transmitter 1.

Further, the amplitude E of the output voltage v from the voltage detection circuit 6 and the amplitude I of the output current i from the current detection circuit 7 change greatly due to changes in the P point impedance Z〓. Therefore, if the amplitudes of the output voltage v and the output current i are limited by inserting the AC limiters 13 and 14, the operation of the phase difference detection circuit 9 becomes stable.

Further, in this embodiment, the output voltage V of the subtraction circuit 8
Although we have explained the case where the voltage is divided by the voltage (V'+V''), the output voltage of the voltage detection circuit 6 can be calculated by connecting the division circuits to the input terminals of the subtraction circuit 8 separately.
V' is divided in advance by the output voltage (V'+V'') of the adder circuit 15, and the output voltage V'' of the current detection circuit 7 is divided in advance by the output voltage (V'+V'') of the adder circuit 15. The same effect can be obtained by inputting the signal to the subtraction circuit 8 and detecting the amplitude difference between both inputs.

In addition, in the above embodiment and other embodiments of the present invention, the reactance component of the impedance Z was described as zero.

Here, a case in which the above reactance component is not zero will be collectively explained.

If the reactance component is not zero, Figure 3 shows Figure 5.
_{As shown} in the figure, Z=Zεj, ≠0, ｜Z〓 ₀ ｜=Z ₀ ∠Z=0, ｜ _E〓
It becomes 0.

Therefore, the current I and _the voltage E are I=1/Z+Z ₀ E〓 _{X E} =1/Z+ _{Z 0} E= Z/|Z+Z ₀ |E _X.

Therefore, the amplitude difference V ₁ =E−Z ₀ I=Z−Z ₀ /|Z+Z ₀ | _E
...(2) Amplitude sum V ₂ =E+Z ₀ I=Z+Z ₀ /｜Z+Z ₀ |E _X ...
(3) becomes.

Therefore, V=V ₁ /V ₂ =Z−Z ₀ /Z+Z ₀ (4).

Equation (4) is an equation showing the indicated value of the indicator 10 according to another embodiment of the present invention shown in FIG. 4, and is not only not affected by the voltage E _x , but also by the phase.

On the other hand, equation (2) is an equation showing the indicated value of the indicator 10 according to the embodiment of the present invention shown in FIG. 2, and is affected by the voltage _Ex and phase.
However, by reducing the output fluctuation of the transmitter 1, the influence of _{the voltage E X is} eliminated, so
The influence of phase will be explained.

The ratio Δ() between equation (4) and equation (2) is given by Δ()=Z− _{Z 0} /Z+Z ₀ /Z−Z ₀ /｜Z+Z
₀ |=|Z+Z ₀ |/Z+Z ₀ ...(5).

If FIG. 5 is illustrated, it will become as shown in FIG. 6.
Here, it corresponds to =Z+Z ₀ , =|Z〓+Z〓 ₀ |.

The ratio Δ() is /, and from FIG. 6 it can be seen that 0∠Δ()≦1. Further, in the case of an antenna tuner, since the resistance component of impedance is positive, the range of change is -π/2≦≦π/2. Therefore, the maximum of the ratio Δ() occurs at =0, in which case it is independent of phase and there is no error in the indication due to phase. Further, the minimum value of the ratio Δ() occurs when =±π/2, and at this time the error is maximum.

=±π/2 means that Z〓 is pure reactance, and in this case, equation (4) becomes Δ()=√ ² + ₀ ² /(Z+Z ₀ ), and Z
When = Z ₀ , Δ() = 1/√2, which causes the maximum error. However, in this case, from equation (2), V ₁
=0.

On the other hand, when the voltage V ₁ is adjusted to zero, it is clear from equation (2) that Z=Z ₀ regardless of the presence or absence of phase influence. Therefore, even if there is a phase effect in one embodiment of the present invention, no zero point shift occurs on the indicator 10.

In the above-described embodiment and other embodiments of the present invention, when it is desired to indicate the standing wave ratio, the voltage output v and current of the voltage detection circuit 6 are An instruction can be given by inputting the current output i of the detection circuit 7 to an SWR indicating device 12 consisting of a known standing wave ratio calculation circuit and an indicator.

As explained above, according to the present invention, the information for performing the tuning operation of the antenna tuner can be obtained dually from the instructions of the two indicators, making the tuning operation easier and reducing the time required for the tuning operation. At the same time, the risk of damaging the final stage of the transmitter or causing performance deterioration due to extreme tuning operations is reduced.

In addition, in the present invention, since the absolute value and phase angle of the load impedance can be read using the indicator, it can also be used as an impedance measuring device, and the accuracy is also good, especially when shown in other embodiments of the present invention. It is.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional tuning instruction device for an antenna tuner. FIG. 2 is a block diagram of an embodiment of the present invention. FIG. 3 is an equivalent circuit for explaining the operation of one embodiment of the present invention. FIG. 4 is a block diagram of another embodiment of the present invention. FIG. 5 and FIG. 6 are diagrams for explaining one embodiment and other embodiments of the present invention when the load impedance has a reactance component. 1...Transmitter, 2...Antenna tuner, 5...
... Antenna, 6 ... Voltage detection circuit, 7 ... Current detection circuit, 8 ... Subtraction circuit, 9 ... Phase difference detection circuit, 10 and 11 ... Indicator, 13 and 14
...AC millimeter, 15...addition circuit, 16...
Division circuit.

Claims (1)

[Claims for Utility Model Registration] (1) Voltage detection means for detecting voltage at a predetermined position on a connection line between a transmitter and an antenna tuner, current detection means for detecting a current flowing through the predetermined position, and phase difference detection means for outputting a signal corresponding to the phase difference between the voltage detected by the detection means and the current detected by the current detection means; and the amplitude of the voltage detected by the voltage detection means and the amplitude detected by the current detection means. amplitude difference detection means for outputting a signal corresponding to an amplitude difference with the amplitude of the current; a first indicator at a center zero for instructing the output of the phase difference detection means; and a first indicator for instructing the output of the amplitude difference detection means. 1. A tuning indicating device for an antenna tuner, comprising: a center zero second indicator. (2) The antenna tuner tuning instruction device according to claim 1, wherein the phase difference detection means is a phase difference detection circuit. (3) The antenna tuner tuning instruction device according to claim 1, wherein the amplitude difference detection means is a subtraction circuit. (4) The amplitude difference detection means includes an addition means for outputting the sum of the amplitude of the voltage detected by the voltage detection means and the amplitude of the current detected by the current detection means, and the amplitude of the voltage detected by the voltage detection means and the amplitude of the current detected by the voltage detection means. It is characterized by comprising a subtraction circuit that outputs an amplitude difference between the amplitude of the current detected by the detection means, and a division means that divides the output of the subtraction circuit by the output of the addition means to drive the second indicator. A tuning instruction device for an antenna tuner according to claim 1 of the utility model registration claim. (5) The amplitude difference detection means includes an addition means for outputting the sum of the amplitude of the voltage detected by the voltage detection means and the amplitude of the current detected by the current detection means, and an addition means for outputting the sum of the amplitude of the voltage detected by the voltage detection means. a first dividing means for dividing the amplitude of the current detected by the current detecting means by the output of the adding means; 2. The tuning instruction device for an antenna tuner according to claim 1, further comprising a subtracting device for calculating the difference between the output of the dividing device and the output of the dividing device and driving the second indicator.