JPS60165816A - Tuning device - Google Patents

Abstract

PURPOSE:To improve the accuracy of remote control of a tuning frequency by providing an impedance circuit network connected to a reactance element and a transmission line having a length nearly equal to an odd number multiple of a lambda/4 electric length in the tuning frequency and inserted and connected between the reactance element and the impedance circuit network. CONSTITUTION:The reactance circuit network is connected to the reactance element via the transmission line having a length nearly equal to a lambda/4 electric length in the tuning frequency. The inpedance converting function is realized by the combination of the transmission line and the reactance circuit network and the converted reactance having a property opposite to that of the reactance of the reactance circuit network to be converted realized in this way is acted onto the reactance element equivalently in parallel or series. For example, an impedance converter 19 comprising the connection of a seried resonace circuit to be converted consisting of a variable capacitor 17 and a variable inductor 18 via a coaxial 16 of a lambda/4 electric length to the tuning capacitor 15 is connected and installed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a tuning device that can be used in radio, television receivers and transmitters, and other communication devices in general.

Conventional configurations and their problems In recent years, the number of radio and television broadcast waves or communication waves of communication devices has tended to increase, and the performance of tuning devices that select the frequency of signals to be received or transmitted has been increasing. Stability and reliability are increasingly required. On the other hand, reducing manufacturing costs, including frequency adjustment, in receivers, transmitters, and communication devices that install tuning devices is also an important issue. Technology development is needed.

A conventional tuning device will be described below with reference to the drawings. FIG. 1 shows a basic tuning circuit, where 1 is an inductor and 2 is a capacitor. And those inductors l
A tuning device constituted by a parallel resonant circuit 3 consisting of a capacitor 2 and a capacitor 2 has conventionally been realized using components as shown in FIG. 2 or 3. That is, as shown in FIG. 2, the separate components of an inductor component 4 and a capacitor component 5 were connected by circuit conductors 6 and 7 to form a tuning device. Another method, as shown in FIG. 3, is to install a planar inductor 9 on the surface of a plate-shaped dielectric 8, and further install a capacitor 12 consisting of opposing electrodes 10 and 11, each with a separate inductor. 9 and capacitor 12 are circuit conductors 13
and 14 to form a tuning device.

However, in the above configuration, it is impossible to remotely install each tuning component constituting the tuning device in order to remotely control the tuning frequency in the tuning device. That is, by remotely locating each tuning component, the connecting leads are extended, which makes the stray capacitor and lead inductance uncertain, and the tuning frequency cannot be stabilized. Therefore, there has been a problem in that the tuning frequency accuracy is significantly degraded and it is impossible to realize a tuning device with high tuning frequency accuracy.

Purpose of the Invention The present invention provides stable tuning operation even if an actance network is added to a reactance element or installed remotely, and the tuning frequency can be remotely controlled while reversing the reactance properties in the actance network. The object of the present invention is to provide a tuning device that can perform the following steps.

Structure of the Invention In order to achieve the above object, the reactance element of the present invention is connected to a reactance network via a transmission line having a length approximately equal to an odd multiple of λ/4 electrical length at the tuning frequency. configuration, which allows λ/4
The combination of a transmission line with a length equal to an odd multiple of the electrical length and a reactance network connected thereto exhibits an impedance conversion function, and the reactance network realized by the conversion has a property opposite to that of reactance. The converted reactance is applied isometrically to the reactance element in parallel or in series.

DESCRIPTION OF EMBODIMENTS Hereinafter, a tuning device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 4 shows a circuit diagram of a tuning device in a first embodiment of the invention. In the figure, 15 is a tuning capacitor, and a variable capacitor 17 and a variable inductor 18 are connected to it via a coaxial cable 16 of λ/4 electrical length.
An impedance converter 19 to which a series resonant circuit to be converted consisting of the following is connected is connected and installed.

FIG. 5 shows a circuit diagram of a tuning device in a second embodiment of the invention. In the figure, 20 is a tuning capacitor, to which a variable capacitor 22 and a variable inductor 23 are connected via a coaxial cable 21 of λ/4 electrical length.
An impedance converter 24, which is connected to a parallel resonant circuit to be converted, is connected and installed.

FIG. 6 shows a circuit diagram of a tuning device in a third embodiment of the invention. In the figure, 25 is a tuning capacitor, and an impegance converter 29 is connected to a parallel resonant circuit to be converted consisting of a variable voltage capacitor 27 and a variable current inductor 28 via a coaxial cable 26 having an electrical length of λ/4. are connected and installed.

FIG. 7 shows a circuit diagram of a tuning device in a fourth embodiment of the invention. In the figure, 120 is a tuning capacitor, and an impedance converter is formed by connecting a series resonant circuit to be converted consisting of a voltage variable capacitor 122 and a current variable inductor 123 via a coaxial cable 121 having an electrical length of λ/4. 124 are connected and installed.

FIG. 8 shows a circuit diagram of a tuning device in a fifth embodiment of the invention. In the figure, 30 is a tuning inductor, to which a variable capacitor 32 and a variable inductor 33 are connected via a coaxial cable 31 of λ/4 electrical length.
An impedance converter 34 to which a converted series resonant circuit is connected is connected and installed.

FIG. 9 shows a circuit diagram of a tuning device in a sixth embodiment of the invention. In the figure, 35 is a tuning inductor, to which a variable capacitor 37 and a variable inductor 38 are connected via a coaxial cable 36 of λ/4 electrical length.
An impedance converter 39 to which a parallel resonant circuit to be converted consisting of the following is connected is connected and installed.

FIG. 10 shows a circuit diagram of a tuning device according to a seventh embodiment of the present invention. In the figure, 40 is a tuning inductor, and an impedance converter 44 is connected to a parallel resonant circuit to be converted consisting of a variable voltage capacitor 42 and a variable current inductor 43 via a coaxial cable 41 having an electrical length of λ/4. are connected and installed.

FIG. 11 shows a circuit diagram of a tuning device in an eighth embodiment of the invention. In the figure, 125 is a tuning inductor, and an impedance converter is connected to it through a coaxial cable 126 of λ/4 electrical length to a series resonant circuit to be converted consisting of a ζ voltage variable capacitor 127 and a current variable inductor 128. 129 is connected and installed.

FIG. 19 shows a circuit diagram of a tuning device in a ninth embodiment of the present invention. In the figure, 45 is a tuning capacitor, and a variable capacitor 50 and a variable inductor 51 are connected via a transmission line 49 of λ/4 electrical length consisting of electrodes 47 and 48 placed opposite to each other with a dielectric 46 in between. An impedance converter 52 to which a series resonant circuit to be converted is connected is connected and installed.

FIG. 13 shows a circuit diagram of a tuning device according to a tenth embodiment of the present invention. In the figure, 53 is a tuning capacitor, and a variable capacitor 58 and a variable inductor 59 are connected to it via a transmission line 57 of λ/4 electrical length, which is made up of electrodes 55 and 56 placed opposite to each other with a dielectric 54 in between. An impedance converter 60 to which a parallel resonant circuit to be converted is connected is connected and installed.

FIG. 14 shows a circuit diagram of a tuning device in an eleventh embodiment of the present invention. In the figure, 61 is a tuning inductor, and a voltage variable capacitor 66 and a current variable inductor 67 are connected via a transmission line 65 of λ/4 electrical length consisting of electrodes 63 and 64 placed opposite to each other with a dielectric 62 in between. An impedance converter 68 to which a parallel resonant circuit to be converted consisting of the following is connected is connected and installed.

FIG. 15 shows a circuit diagram of a tuning device in a twelfth embodiment of the invention. In the figure, 130 is a tuning capacitor, to which a λ/4 tuning capacitor is made up of electrodes 132 and 133 placed opposite to each other with a dielectric 131 in between.
Voltage variable capacitor 13 via electric length transmission line 134
An impedance converter 137 is connected to an impedance converter 137 which is connected to a series resonant circuit to be converted consisting of a variable current inductor 136 and a variable current inductor 136.

FIG. 16 shows a circuit diagram of a tuning device according to a thirteenth embodiment of the present invention. In the figure, 69 is a tuning inductor, and a variable capacitor 74 and a variable inductor 75 are connected to it through a transmission line 73 of λ/4 electrical length, which is made up of electrodes 71 and 72 placed opposite to each other with a dielectric 70 in between. An impedance converter 76 to which a series resonant circuit to be converted is connected is connected and installed.

FIG. 17 shows a circuit diagram of a tuning device according to a fourteenth embodiment of the present invention. In the figure, 77 is a tuning inductor, and a variable capacitor 82 and a variable inductor 83 are connected to it via a transmission line 81 of λ/4 electrical length consisting of electrodes 79 and 80 which are placed opposite to each other via a galvanic body 78. An impedance converter 84 to which a parallel resonant circuit to be converted is connected is connected and installed.

FIG. 18 shows a circuit diagram of a tuning device according to a fifteenth embodiment of the present invention. In the figure, 85 is a tuning inductor, and a voltage variable capacitor 90 and a current variable inductor 91 are connected via a transmission line 89 of λ/4 electrical length consisting of electrodes 87 and 88 placed opposite to each other with a dielectric 86 in between. An impedance converter 92 is connected to the parallel resonant circuit to be converted.

FIG. 19 shows a circuit diagram of a tuning device in a 16th embodiment of the present invention. In the figure, 138 is a tuning inductor, and a λ/4 tuning inductor is made up of electrodes 140 and 141 placed opposite to it with a dielectric 139 interposed therebetween.
The voltage variable capacitor 14 is connected to the voltage variable capacitor 14 via the electrical length transmission line 142.
An impedance converter 145 is connected and connected to a series resonant circuit to be converted consisting of a variable current inductor 144 and a variable current inductor 144.

In each of the above embodiments, the transmission line of λ/4 electrical length can be easily constructed using a general coaxial cable in the embodiments shown in FIGS. A thin transmission line with an electrical length of λ/4 can be easily constructed.

Furthermore, in each of the above embodiments, the transmission line in the impedance converter was explained using a transmission line with an electrical length of λ/4, but it is also possible to use a transmission line with a length equal to an odd multiple of the λ/4 electrical length at the tuning frequency. It is also possible to construct a similar tuning device.

In each of the embodiments shown in FIGS. 12 to 19, a transmission path in which a pair of electrodes are disposed opposite to each other via a dielectric material is used, but the respective electrodes are arranged side by side on the same surface of the dielectric material. It is possible to construct a similar tuning device even if the two electrodes are disposed opposite each other inside a dielectric material.

Furthermore, in each of the embodiments shown in FIGS. 4 to 19, the length of the transmission line used does not strictly require λ/4 electrical length, but a transmission line with approximately the same length is used. It is possible to configure

In addition, as the transmission line electrode in each of the embodiments shown in FIGS. 12 to 19 above, a metal conductor, a printed metal foil conductor, a thick film printed conductor, a thin film conductor, etc. can be used, and each of the above conductors may be of a different type. May be combined. On the other hand, as the dielectric material, alumina ceramic, barium titanate, plastic, polyfluoroethylene fiber, glass, mica, resin printed circuit board, etc. can be used.

Furthermore, in each of FIGS. 4 to 19 above, the tuned reactance element is shown to have a fixed reactance, and the reactance elements constituting the resonant circuit to be converted are each shown to have variable reactance. It is also possible to construct a tuning device in which the tuning frequency is variable by making at least one of the elements variable.

The operation of the tuning devices of these embodiments configured as described above will be explained below.

20(a) to (C1 are equivalent circuits and Smith diagrams for explaining the operation of the λ/4 electrical length impedance converter in the tuning device of the present invention. FIG. 20(a)
In a transmission line with an electrical length l and a load Z(β) connected to the tip as shown in , the normalized input impedance and normalized input admittance when looking at the load side from 2 = 0 are as follows: In the case of no loss (γ−jβ), it can be expressed as yo (Yo + j Y (7ri tanβl)).

Here, if l-λ/4, then βp-(2π/λ)(λ/4)-π/2...(3), so tan ββ= tan π/2-ω・ ・ ・ ・
・ ・ ・(4) becomes.

On the other hand, if the electrical length l of the line is an odd multiple of λ/4, then β1=(2π/λ)(λ/4)・n (n=1.3, 5, 7...)...・(5)tan
j91 ]=tan π/2=■ (in case of n-1)...
......(6) tanβ13=tan3π/2=-
■ (In case of n-3)・・・・・・(7) tanβA6
= tan5π/2-06 (when n = 5) (8), and in either case, the normalized input impedance and input admittance shown in equations (11 and (2)) is (below the margin).

That is, the normalized human power impedance when looking at the load side from a certain reference plane is equal to the normalized input admittance when looking at the reference plane or 4 load sides separated by an electrical length λ/4 from that point.

Further, the normalized input admittance viewed from a certain reference plane toward the negative tj side is equal to the normalized input impedance viewed from the load side from a reference plane separated by an electrical length λ/4 from that point. This provides an impedance conversion function.

The modes in which the operation of the impedance converter described above affects the operation of the tuning device according to the embodiment of the present invention will be described below. The converted series resonant actance installed in the impedance converter in each embodiment is shown in Figure 20 (9 representing the zero reactance in the Smith diagram shown in bl).
As a result of impedance conversion, this is converted to position 94, which represents infinite reactance. In addition, when the series resonance actance to be converted is changed, that is, by changing the series resonance reactance to be converted and moving it to the inductive reactance 95, the capacitive reactance 96 to be impedance converted is changed and moved to the capacitor. It is possible to convert it to On the contrary, by changing the series resonant reactance to be converted and changing it to the capacitive reactance 97, it is possible to change the inductive reactance 98 whose impedance is converted and convert it into an inductor.

On the other hand, the parallel resonant actance to be converted installed in the impedance converter in each embodiment is the 20th
It is located at position 99 representing infinite reactance in the Smith diagram shown in Figure (C), and as a result of impedance conversion, it is converted to position 100 representing zero reactance. In addition, when the parallel resonant actance to be converted is changed, that is, by changing the parallel resonant actance to be converted and moving it to the inductive reactance 101, it is changed to the capacitive reactance 102 whose impedance is converted. It is possible to convert it into a capacitor. On the contrary, by changing the parallel resonant actance to be converted and moving it to the capacitive reactance 103,
It is possible to change the inductive reactance 104, which is subjected to impedance conversion, and convert it into an inductor.

Due to the operation of the tuning device according to the embodiment of the present invention explained above, the tuning device according to the embodiment shown in FIGS. 4 to 19 can first be represented by the equivalent circuit shown in FIG. The converted equivalent inductance 107 in the impedance converter 106 is connected in parallel to the capacitor 105,
This makes it possible to configure a parallel resonant circuit. On the other hand, as shown in FIG. 21fbl, the tuning inductor 1
By connecting the converted equivalent capacitance 110 in the impedance converter 109 in parallel to the impedance converter 08, it is also possible to configure a parallel resonant circuit.

Further, as shown in the equivalent circuit shown in FIG. 21(C), the impedance converter 11
The converted equivalent inductances 113 at 2 will be connected in series, thereby making it possible to construct a series resonant circuit.

On the other hand, as shown in FIG. 21 (dl), the tuning inductor 11
It is also possible to configure a series resonant circuit by connecting the converted equivalent capacitance 116 in the impedance converter 115 in series with respect to the impedance converter 115.

Effects of the Invention As described above, the present invention is configured such that a reactance network is connected to a reactance element via a transmission line having a length approximately equal to an odd multiple of λ/4 electrical length at a tuning frequency. By doing so, an equivalent reactance having a property opposite to that of the reactance of the reactance network is connected in parallel or series to the reactance element, and isometrically constitutes a parallel resonant circuit or a series resonant circuit to tune the tuned device. We are trying to realize this.

This makes it possible to realize a tuning device that has an extremely wide range of tuning frequency control specifications and also has high tuning Q performance. In other words, by only varying the reactance of any variable reactance element installed in the impedance converter, it is possible to form a tuned additive reactance that spans inductance reactance and capacitive reactance, and at the same time, it is possible to create a tuned additive reactance that spans inductance reactance and capacitive reactance, and at the same time, it is possible to create a tuned additive reactance that spans inductance reactance and capacitive reactance. An excellent effect can be obtained in that it is also possible to adjust the degree of inversion. Furthermore, compared to the case where a tuned additive reactance is formed by a conventional actance element alone, since a resonance reactance is used together with a tuned additive reactance, it is possible to utilize the Q improvement effect near the resonance frequency. A tuned additive reactance with a higher Q than with the reactance element alone can be achieved. This provides the excellent effect of dramatically improving the tuning Q performance of the tuning device.

Furthermore, even if the respective reactance elements and reactance networks in the tuning device are installed remotely, λ/
Since the impedance of the four transmission lines can be stably ensured, it is possible to determine the stray capacitor and lead inductance. Therefore, it is possible to realize a tuning device with extremely high tuning frequency accuracy even if each actance element and reactance network in the tuning device are installed remotely, and any one of the actance elements and reactance network installed remotely can be made variable. This provides the excellent effect of enabling remote control of the tuning frequency.

[Brief explanation of drawings]

Figure 1 is a basic tuning device circuit diagram, Figures 2 and 3.
The figure is a perspective view showing the configuration of a conventional tuning device, FIGS. 4 to 19 are circuit configuration diagrams of a tuning device in an embodiment of the present invention, and FIGS. 20(a) to (C) are tuning devices of the present invention. An explanatory diagram showing the operating principle in Fig. 21+8)~
(dl is an equivalent circuit diagram of the tuning device in the embodiment of this invention.' 15, 20, 25, 45, 53, 61, 105°,
・1111, 120, 130...Tuning capacitor, 3
0°135, 40.69.7? , 85.108.11
4゜125.138... Domen inductor, 16,21
26.31, 36, 41.121 126...λ/4
Electrical length coaxial cable, 49, 57, 65.73.81
, 89, 134, 142...transmission line of λ/4 electrical length,
17,22,27,32,37.42゜50.58.6
6.74,82,90,122゜127.135,14
3... Capacitor of the resonant circuit to be converted, 33, 38, 4
3,51,59,67゜75.83.91,123,1
28, 136, 144... Inductor of the resonant circuit to be converted, 19, 24° 29.34, 39, 44, 52, 60
,68.76°84.92,106,109,112,
115゜124,129,137,145... Impedance converter, 107,113... Equivalent inductance, 110.116... Equivalent capacitance Fig. 1 Fig. 3 Fig. 4 Fig. 5 Whistle 6 H No. 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure S12 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 Figure 20 Figure 20 Figure 21

Claims (1)

[Scope of Claims] (11) a reactance element, an impedance network connected to the reactance element, and a length equal to an odd multiple of approximately λ/4 electrical length at the tuning frequency; (2) A tuning device according to claim 1, wherein a series or parallel resonator comprising an inductor and a capacitor is installed as an impedance network. (3) The tuning device according to claim 11, in which the impedance network or the reactance element is a variable reactance element. (4) The impedance network or the reactance element is a variable capacitance element or a variable inductance element. The tuning device according to claim 1, wherein the impedance network or the reactance element is composed of at least one of a voltage variable capacitance element and a current variable inductance element. (6) The tuning device according to claim 11, wherein the tuning device comprises at least one of: The tuning device according to claim 1). (7) Claim No. (7) wherein the transmission line is a coaxial cable.
The tuning device described in section 1). (8) The tuning device according to claim 11, wherein the transmission path is constituted by a pair of electrodes with a dielectric interposed therebetween.