JPH0514004A - Phase adjustment circuit - Google Patents

Abstract

PURPOSE:To simply adjust the phase characteristic while checking the characteristic of an amplifier circuit with respect to the phase adjustment circuit used when outputs of plural amplifier circuits are synthesized. CONSTITUTION:A pattern 22 of almost U-shape whose total length is (nlambdag')/2 with respect to the operating frequency is formed on a 1st board 21, 1st and 2nd patterns 12, 13 almost in parallel from an open end by a prescribed length and folded in opposite directions to each other by the prescribed length or over at a prescribed angle are formed onto a 2nd board 11, the almost parallel parts 221, 222 in the U-shaped pattern are in contact with the almost parallel parts 121, 131 in the 1st and 2nd patterns overlappingly and either of the boards is movable continuously in the vertical direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phase adjusting circuit used for combining outputs of a plurality of amplifier circuits, for example.

In recent years, transistors have been used in power amplifier circuits in the ultra high frequency band, but there is a limit to the amount of ultra high frequency power that can be extracted from a single transistor. Therefore, when the desired ultra-high frequency power is not reached with one transistor, a plurality of power amplifier circuits are connected in parallel and the high frequency power output from these power amplifier circuits is combined. At this time, the characteristics of the amplifier circuit are Obviously, it is necessary to make it possible to easily adjust the pass phase characteristic.

[0003]

2. Description of the Related Art FIG. 7 is a block diagram of a conventional example. (A) shows stubs of the same length separated by about λg / 4, and (B) cuts the middle of a transmission line. It has a copper foil in the shape of a letter.

Conventionally, in order to adjust the passing phase of the amplifier circuit, a phase adjusting circuit is added to the outside or the inside of the circuit. As an external one, a coaxial line stretcher is used. , As an internal attachment, a stub of the same length should be installed in the middle of the transmission line.
It is attached with a distance of g / 4, or cut in the middle of the transmission line and attached with a U-shaped copper foil. In any case, the length of the transmission line is changed.

FIG. 7 (A) corresponds to the paragraph, and a transmission line 54 formed on a dielectric substrate 51 is provided with stubs 52 and 53 of the same length, separated by λg / 4. Yes (same as a capacitor is inserted equivalently). So the transmission line
The signal input from the left side of 54 is output with its phase changed by the stubs 52 and 53.

Since the stubs 52 and 53 are connected to the transmission line at a distance of λg / 4, the impedance seen from the input side remains the characteristic impedance. Also, FIG.
(B) corresponds to the term.The part of the L-shaped transmission line 63 and the rotated L-shaped transmission line 62 obtained by rotating the L-shaped transmission line 180 degrees on the substrate 61, which are parallel to each other, is Cut at the position.

Then, a U-shaped copper foil 65 or another U-shaped copper foil 64 is connected to the L-shaped transmission line and the rotating L-shaped transmission line as shown in the figure. As a result, the phase changes by the change in the length of the U-shaped copper foil.

[0008]

Here, the one using the coaxial line stretcher of the item is expensive because the total length is changed. Also, in the case of using the term and the term, copper foils with different lengths are attached to the transmission line to check the phase characteristics, and if it does not reach the specified value, it is replaced with a copper foil with a different length. At the same time, there is a problem that it is impossible to make adjustments while viewing the characteristics.

An object of the present invention is to make it possible to easily adjust the phase characteristic while observing the characteristic of the amplifier circuit.

[0010]

According to the first aspect of the present invention, as shown in FIG. 1, 22 is a substantially U-shaped pattern formed on the first substrate and has a total length of (nλg ') at the operating frequency. /
It is 2.

Reference numerals 12 and 13 are formed on the second substrate and are substantially parallel to each other from the open end to a predetermined length. When the length is longer than the predetermined length, the first and second bends are formed in opposite directions at predetermined angles. This is the second pattern.

Then, one of the substrates is vertically moved while the substantially parallel state portion of the U-shaped pattern is overlapped and contacted with the substantially parallel state portion of the first and second patterns. It is configured to be able to move continuously.

The second aspect of the present invention, as shown in FIG.
22 is a substantially parallel state portion of the above U-shaped pattern, and 321, 331 are substantially parallel state portions of the first and second patterns.

Then, one of the substrates is placed in the concentric circle while the substantially parallel state portion of the U-shaped pattern is overlapped and brought into contact with the substantially parallel state portion of the first and second patterns. The structure is such that the top can be moved continuously.

According to the third aspect of the present invention, as shown in FIG. 6, a plurality of phase adjusting scale patterns are formed on a stationary substrate.

[0016]

According to the first aspect of the present invention, a substantially U-shaped pattern having a total length of (nλg ') / 2 at the operating frequency is formed on the first substrate, and both ends of the U-shaped pattern are the first. Extends to the edge of the substrate.

On the other hand, on the second substrate, from the open end to the predetermined length, they are in a state of being substantially parallel to each other, and when the length is longer than the predetermined length, they are bent in opposite directions at a predetermined angle. To extend to form first and second patterns.

Then, one of the substrates is vertically moved while the substantially parallel state portion of the U-shaped pattern is overlapped with and brought into contact with the substantially parallel state portion of the first and second patterns. It is configured to be able to move continuously.

After the movement, the first substrate and the second substrate are fixed with screws, for example. The second aspect of the present invention is the above U.
The substantially parallel part of the letter-shaped pattern and the substantially parallel part of the first and second patterns are formed on a common concentric circle.

Then, one of the substrates is placed in the concentric circle while the substantially parallel state portion of the U-shaped pattern is overlapped and contacted with the substantially parallel state portion of the first and second patterns. The structure is such that the top can be moved continuously.

According to a third aspect of the present invention, a plurality of phase adjustment scale patterns are formed on the immovable substrate. Thus, the phase characteristic can be easily adjusted while checking the characteristic of the amplifier circuit.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a configuration diagram of an embodiment of the present invention, (A) is a pattern diagram formed on a second substrate, (B) is a pattern diagram formed on a first substrate, (C). Allows the first substrate to be continuously moved in the vertical direction while the pattern formed on the first substrate is in contact with the first and second patterns formed on the second substrate in an overlapping manner. Fig. (D)
It is a side view of (C).

FIG. 2 is an explanatory view of an application example of FIG. 1, and FIG.
In the configuration diagram of the embodiment of the present invention, (A) is a pattern diagram formed on the second substrate, (B) is a pattern diagram generated on the first substrate, and (C) is the first substrate. It is a configuration explanatory view in which the first substrate can be continuously moved on a concentric circle while the pattern formed on the second substrate is in contact with the first and second patterns formed on the second substrate. is there.

FIG. 4 is a constitutional view of another embodiment of the second invention, (A) is a constitutional explanatory view in which a substrate pressing spring is added to the first substrate of (C) of FIG. 3, ( B) is an explanatory view of the structure in which a slit is provided on the first substrate of FIG. 3C, FIG. 5 is a view of the configuration of another embodiment of the second invention, and FIG. 6 is a diagram of the third invention. In the configuration diagram of the embodiment, (A) is a configuration explanatory diagram in which a phase adjusting scale pattern is provided on the second substrate of (C) of FIG. 1, and (B) is the second configuration of (C) of FIG. It is a structure explanatory view which provided the phase adjustment scale pattern on the substrate.

The configuration will be described below in sequence from FIG. As shown in FIGS. 1 (A) and 1 (B), the second substrate 11 has an L-shaped pattern 13 and a rotation L obtained by rotating the L-shaped pattern 180 degrees.
The pattern 12 is formed, and the ends of the patterns 132 and 122 extend to the edge of the second substrate. In addition, through holes 14 and 15 are provided in this substrate.

On the other hand, a substantially U-shaped pattern 22 is formed on the first substrate, and both ends thereof extend to the ends of this substrate, but the electrical length at the signal frequency is λg '/ 2. The substrate is provided with elliptical through holes 23 and 24.

Here, the line 12, formed on the second substrate,
The width of 13 is such that the characteristic impedance becomes Z ₀ , but the width of the line 22 formed on the first substrate overlaps with the line formed on the second substrate even if it is displaced by a small amount. As such, it is made wider than tracks 12 and 13.

Now, as shown in FIG. 1 (C), these two substrates are superposed so that the transmission lines contact each other, and the signal input from the left side is output from the right side via the U-shaped pattern. To do so.

At this time, since the upper and lower portions of the portion where the two patterns are overlapped (the portions in the parallel state) are sandwiched by the dielectric substrates, the transmission of the portion where the effective dielectric constant ε _eff ′ of the transmission line is not sandwiched. It becomes larger than the effective dielectric constant ε _{eff of the} line. However, as mentioned above, the total length of the U-shaped pattern is λg '
Since the length is set to / 2, the characteristic impedance seen from the input side remains Z ₀ .

Here, λg '/ 2 is the effective permittivity of the substrate ε
Needless to say, it is 1/2 wavelength at _eff '.
Furthermore, the same applies even if there is a conductor pattern on the back surface of the substrate. That is, when sliding in the direction of the arrow in (C) of Fig. 1, the characteristic impedance of the line does not change and only the passing phase can be changed, but the width of the U-shaped pattern 22 is the L-shaped pattern 13 and the rotation. The same applies to the case where the width is larger than the width of the L-shaped pattern 12, and λg '/ 2 is irrelevant whether the width is wide or narrow.

Then, the phase can be continuously varied by fixing it with screws 25 and 26 after adjusting it to a predetermined passing phase. FIG. 2 is a diagram for explaining an application example of FIG. 1, which is a combination of the phase adjustment circuit and the amplification transistor shown in FIG.

In the figure, the signal from the input connector is
It is added to the transistor 4 through the DC blocking capacitor C ₁ and amplified. Then, the amplified signal is phase-shifted by a predetermined amount in the phase adjusting circuit 1 via the DC blocking capacitor C ₂ and is sent out from the output connector.

Here, the stubs S ₁ and S ₂ are for matching the input side of the transistor, and the stubs S ₃ and S ₄ are for matching the output side, and the capacitor C ₁ is inserted. The lower part of the transmission line on the output side where the transmission line on the input side and the capacitor C ₂ are inserted is a voltage supply circuit that supplies the required voltage to the transistor 4, and through the feed-through capacitors 6 and 5. Connected to power supply.

3A and 3B show substantially parallel portions 421 and 422 of the U-shaped pattern 41 and substantially parallel portions 321 of the first and second patterns 32 and 33. , 331 are formed on the first and second substrates (41, 31) so as to be arranged in a common concentric circle.

Then, with the center of the concentric circle as an axis, the substantially parallel state portion of the U-shaped pattern is divided into the first and second portions.
It was made possible to rotate continuously while overlapping and in contact with the substantially parallel part of the pattern.

That is, as shown in FIG. 3C, screws are inserted into the through holes 34 provided in the first substrate and the through holes 43 provided in the second substrate, and as shown by the arrows. Rotate on a concentric circle, and fix the screw at the position of the specified amount of phase shift.

FIG. 4 shows another embodiment of the second invention, in which the first substrate 41 is held by a spring 43 so that the first substrate 41 is always in contact with the second substrate. FIG. 5 shows still another embodiment of the second invention, in which a slit 43 is provided on the first substrate so that the substrate can be rotated by, for example, a flat head screwdriver.

FIGS. 6A and 6B are diagrams in which the phase adjusting scale patterns 16, 17, and 35 are generated on the second substrates 11 and 31, and the phase shift amount for the scale is calibrated in advance. If this is done, the phase can be adjusted more easily.

That is, the phase characteristic can be easily adjusted while observing the characteristic of the amplifier circuit.

[0040]

As described in detail above, according to the present invention, the phase characteristic can be easily adjusted while observing the characteristic of the amplifier circuit.

[Brief description of drawings]

1A and 1B are configuration diagrams of an embodiment of the present invention, in which FIG. 1A is a pattern diagram formed on a second substrate, FIG. 1B is a pattern diagram formed on a first substrate, and FIG. The structure in which the first substrate can be continuously moved in the vertical direction while the pattern formed on the second substrate is in contact with the first and second patterns formed on the second substrate in an overlapping manner. Explanatory drawing, (D) is a side view of (C).

FIG. 2 is an explanatory diagram of an application example of FIG.

FIG. 3 is a block diagram of a second embodiment of the present invention, in which (A) is the second
Pattern diagram formed on the first substrate, (B) is a pattern diagram generated on the first substrate, (C) is a pattern diagram formed on the first substrate, FIG. 8 is a configuration explanatory view in which the first substrate can be continuously moved on a concentric circle while being overlapped with and in contact with the second pattern.

4A and 4B are configuration diagrams of another embodiment of the second invention, in which FIG. 4A is a configuration explanatory diagram in which a substrate pressing spring is added to the first substrate of FIG. 3C, and FIG. It is a structure explanatory view which provided the slit in the 1st board | substrate of 3 (C).

FIG. 5 is a configuration diagram of yet another embodiment of the second invention.

FIG. 6 is a block diagram of a third embodiment of the present invention, in which (A) is FIG.
3C is a configuration explanatory view in which the phase adjustment scale pattern is provided on the second substrate, and FIG. 3B is a configuration description in which the phase adjustment scale pattern is provided on the second substrate in FIG. 3C. It is a figure.

FIG. 7 is a configuration diagram of a conventional example, in which (A) is a stub of the same length that is attached at a distance of approximately λg / 4, and (B) is a U-shaped copper foil cut in the middle of the transmission path. Is attached.

[Explanation of symbols]

12 1st pattern 13 2nd pattern 21 1st substrate 22 U-shaped pattern 221, 222, 421, 422 Almost parallel state part 121 of U-shaped pattern 121, 131, 321, 331 1st, 2nd Near-parallel part of the pattern

Claims (3)

[Claims] 1. A first substrate (21) having a total length of (nλg ') / 2 (n is a positive integer, λg' is a wavelength on the substrate) at an operating frequency, and is substantially U-shaped. A pattern (22) is formed on the second substrate (11) from the open end to a predetermined length in a state of being substantially parallel to each other. Above the predetermined length, a predetermined angle is formed in opposite directions. Forming first and second patterns (12, 13) that are bent at, and substantially parallel state portions (221, 222) of the U-shaped pattern
Is a substantially parallel state part of the first and second patterns
A phase adjusting circuit characterized in that either one of the substrates can be continuously moved in the vertical direction while being overlapped and in contact with (121, 131). 2. The substantially parallel state portions (421, 422) of the U-shaped pattern and the substantially parallel portions (321, 331) of the first and second patterns are formed on a common concentric circle. , One of the substrates is continuously placed on the concentric circle while the substantially parallel part of the U-shaped pattern is overlapped with and brought into contact with the substantially parallel part of the first and second patterns. A phase adjustment circuit characterized in that it can be moved by moving it. 3. A phase adjusting circuit according to claim 1, wherein a plurality of phase adjusting scale patterns are formed on the immovable substrate.