JPS58138108A - Microwave slot line - Google Patents

Abstract

PURPOSE:To attain excellent characteristics for a frequency converter and a frequency modulator, by supplying a bias current independently from connecting points between two diodes and each capacitor. CONSTITUTION:One connecting side of diodes D1, D2 is grounded in terms of impedance at a microwave band with capacitors C1, C2, the dielectric strength test is done for the diodes D1, D2, and since a bias current flows independently between terminals B1, B2 and a conductor pattern 2, the bias current flows from a DC power supply via a high frequency choke independently, the dispersion in the diodes D1, D2 is relieved to match the characteristics at the operating point. In the frequency converter, the bias current is adjusted to make the operating point of the diodes D1, D2 optimum, then the reception sensitivity is increased, the isolation is sufficiently attained and the noise index is improved. In the frequency moldulator, the amplitude level of opposite phase is matched at the two-phase frequency modulation and the modulating characteristics are improved.

Description

Detailed Description of the Invention (a) Technical Separation of the Invention The present invention provides a slot line in which two slot lines each having a predetermined wavelength are connected at both ends and have a branched slot line at one end. A slot line in which two diodes in opposite directions are connected to the inner and outer conductor patterns surrounded by slot lines on both sides (this is used for frequency converters and frequency modulators in the microwave band). The present invention relates to a microwave slot line that has good characteristics when used.

(b) Prior Art and Problems Figure 1 is a plan view of a conventional microwave slot line; 2 shows a circuit diagram of the diode circuit of FIG. 1. FIG.

In the figure, 1 is a single inner material pattern, 2 is an outer conductor pattern,
3 is a branch slot line, 4 is a visiting body board, 1), i)
, is a diode. A frequency converter that supplies a carrier wave fc from the branch slot line 3 shown in FIG. In a frequency modulator that supplies an input signal instead of fc, supplies the local oscillation frequency fL in the same way as above, and obtains a modulated wave from internal conductor pattern 1, diodes i), , i) are shown in Figure 3. Since the connection is as shown, the diode D1+D2 (7)
It has the disadvantage that it is not possible to conduct a pressure control test, and it is not possible to flow a bias current to relieve fluctuations in the diodes D, , D.

For this reason, in the frequency converter, the diodes D, D2 (bias current cannot be passed through this and it cannot be set at the optimum point to increase the receiving sensitivity, and there is also a drawback that the isolation is not sufficiently obtained and the miscellaneous material index deteriorates, and the frequency modulation In the case of two-phase frequency modulation, it is not possible to combine the levels of opposite phases (0) and amplitudes, so the modulation characteristics are poor.

(C) Object of the Invention The object of the present invention is to eliminate the above-mentioned drawback 0) by providing a frequency converter with good characteristics and a frequency 7ic I adjuster, by making it possible to supply a bias current to two diodes independently. The purpose of the present invention is to provide a microwave slot line.

(d) Structure of the Invention In order to achieve the above object, the present invention provides a slot line in which two slot lines having a predetermined wavelength are connected at both ends, and one end has a branch slot line. The inner and outer conductor patterns ζ are rubbed by the slot lines near both sides of the
[In the two slot lines, a capacitor is connected in series to each of the two diodes, one end of the capacitor is connected to the conductor pattern, and the two tie blades and the Either use the connection point with each capacitor as a bias current supply terminal, or make a slit in the center of the inner conductor pattern to separate it in terms of DC current, and connect the two separated conductor patterns with n capacitors. , is characterized in that bias current can be supplied independently to the two diodes.

(e) Examples of the invention Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 is a plan view of a microwave slot line according to an embodiment of the present invention, and FIG. 5 is a diode circuit diagram in the case of FIG.

Components in the figure that have the same functions as those in FIG. 1 are indicated by the same symbols.

0,. 0. is an ultra-small microwave chip capacitor, B,
, B are bias current supply terminals. To explain in Figure 4, a capacitor 01+ is connected in series with the diodes D, , D,
02 and 't4 on one side of the capacitor O,,0,0)
Connect the L pole to the conductor pattern l, and connect the diodes D, , D2
Bias supply terminals B, , B are provided at the connection point between the capacitor CI+62 and the capacitor CI+62. Can you show this in a circuit diagram?
I- and as shown in Figure 5. The same capacitor C1,0 ).

The connection point between capacitor O,,0, and capacitor O,0 is grounded in terms of impedance in the microwave band for bias supply.

By doing this, diodes 1), , D can be tested for withstand voltage, and bias DC can be passed independently between terminals B, , B and conductor pattern 2, so high frequency chokes can be applied from the DC source. A bias current is applied independently through the
It is possible to relieve the fluctuations of the diodes D, , D, and match the characteristics at the operating point.

In addition, in the frequency converter described in the conventional example, since the operating point of the diode D, D, can be adjusted to a suitable point by adjusting the IASM current, the receiving sensitivity is increased and the isolation is sufficient. The noise figure improves.

In addition, in the frequency modulator explained in the conventional example, the sum frequency 9
1. In terms of r modulation, the amplitude levels of opposite phases can be matched, so the modulation characteristics can be improved.

FIG. 6 is a plan view of a microwave strip line according to another embodiment of the present invention, and FIG. 7 is a circuit diagram of a diode circuit in the case of FIG.

Items with the same functions as those in Figure 1 are indicated by the same symbols 01',
1'' is an inner conductor pattern in which the central part of the conductor pattern 1 shown in FIG. 1 is separated by a slit 5 in terms of direct current.

03 and 04 are ultra-small microwave chip capacitors, and the electrodes on both sides are conductive patterns 1'.

1", the conductor patterns 1' and 1" have low impedance in the microwave band. This capacitor is 2
It is good to have low impedance even if the impedance is not high. B3. B
, are terminals for supplying bias current to diodes D, , D21, and conductor patterns 1', respectively.

1'', hence the diode D,.

1) As shown in the circuit diagram shown in FIG. 7, the transistors 2 are Q-shaped so that bias currents can be supplied independently to each other.

Therefore, as explained in the example of FIG. 4, variations in the diodes I), B2 can be corrected and the characteristics at the operating point can be matched using a high frequency choke from a DC power source.

Also, in the frequency converter, diodes T), , D.

Since the operating point can be set to the optimum point, the acceptance sensitivity can be increased, and since sufficient isolation can be obtained, the noise figure can be improved.

In addition, in a frequency modulator, when looking at two-phase frequency modulation, the amplitude levels of opposite phases can be matched, so that the modulation characteristics can be improved.

In addition, diode ■) + l B2 "tltE test can also be performed.

(f) Effects of the Invention More Details (As explained above, the present invention has a circuit that allows bias current to flow independently to the two diodes of the microwave slot line, so it is possible to test the withstand voltage of each diode. The frequency converter used can achieve localized reception sensitivity and a good noise figure, and the frequency modulator can match the amplitude levels of opposite phases in two-phase frequency modulation. It has the effect of obtaining products with good characteristics.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional microwave slot line, FIG. 2 is a cross-sectional view taken in the direction of arrows at points a and a' in FIG. 1, and FIG. 3 is a circuit diagram of the diode circuit in FIG. 1. FIG. 4 is a plan view of a microwave slot line according to an embodiment of the present invention, FIG. 5 is a circuit diagram of the diode circuit of FIG. 4, and FIG. 6 is a plan view of a microwave slot line according to another embodiment of the present invention. 7 is a circuit diagram of the diode circuit of FIG. 6. In the figure, 1.1' and 1'' are internally pressed conductor patterns, 2 is an external conductor pattern, 3 is a branch slot line, 4 is a galvanic conductor board,
5 is Surin), D, , D are diodes, 0, . 0! ,
0. ．． 04 is an ultra-small microwave chip capacitor, Bl
lB2*BS+84 is a bias/current supply terminal. 8- Fig. 1 Fig. 2 Fig. 2 Fig. 3 Fig. Broom 4 Fig. B2 Fig. 5 Fig. l No. 7 Kasumi

Claims (1)

[Claims] 1. A slot line in which both ends of two slot lines having a predetermined wavelength are connected and one end has a branched slot line, and the slot line is surrounded by slot lines near both sides of the branched slot line. In a slot line in which two diodes in opposite directions are connected to the inner and outer conductor patterns,
Connect each capacitor in series to the two diodes,
Connecting one end of the capacitor to the conductive pattern 10,000,
A microwave slot line characterized in that a bias current can be supplied independently from a connection point between the two diodes and each of the capacitors. 2. A slot line where both ends of two slot lines of a predetermined wavelength are connected and one end has a branch slot line,
At the slot line i, in which two diodes in opposite directions are connected to the inner and outer conductor patterns slightly diagonal by the slot line near both sides of the branch slot line, the center of the inner conductor pattern is connected. Put a slit in the DC
A microwave slot line characterized in that the two conductor patterns are separated so that a bias current can be supplied independently to the two diodes, and the two separated conductor patterns are connected by n capacitors.