JPH0448008Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention uses a pulse wave with a repetition frequency sufficiently lower than the microwave signal frequency.
The present invention relates to a microwave semiconductor device having functions such as sampling a microwave signal and performing phase detection or frequency multiplication mixing operation.

[Prior Art] For example, the structure of a microwave slot line disclosed in Japanese Unexamined Patent Publication No. 58-138108 is shown in FIG. 3, and its equivalent circuit is shown in FIG.

As shown in Figure 3, conventionally, a capacitor is fixed with solder or adhesive onto an inner metal pattern surrounded by a slit, so the output line taken out from the midpoint between the capacitor and the diode always crosses the slit and is connected to the slit. coupled to a sampling pulse and a microwave signal that travels through the microwave.

[Problem to be solved by the invention] In this conventional device, as described above, the output line crosses the slit and is coupled to the sampling pulse and microwave signal transmitted through the slit, so the output lines that cross the slit are Z _A and Z _B respectively. Assuming that it has an impedance in the microwave band of , the equivalent circuit including the output line is as shown in FIG.

Therefore, diodes D _A and D _B have Z A and Z _A , respectively.
Objects with impedance Z _B are connected in parallel. Output lines are generally not provided with microwave considerations in mind, so it is difficult for Z _A and Z _B to take the same value. In other words, the sampling pulses are different in time or amplitude due to the diodes D _A and D _B , respectively. This will make a difference.

Especially when operating at high frequencies, this time difference becomes large compared to the pulse width, so the outputs detected by both diodes have a phase difference, which prevents them from being combined efficiently, reducing detection efficiency. There was a drawback.

This invention was made to solve this problem, and even when operated as a sampling phase detector at high frequencies, the outputs detected by both diodes do not have a phase difference, improving detection efficiency. Another object of the present invention is to achieve high-order multiplication frequency mixing with high efficiency even when operated as a multiplication frequency mixer.

[Means for Solving the Problem] In order to achieve the above object, this invention provides a first microstrip line for applying a sampling pulse signal on a dielectric substrate for a microwave integrated circuit, and a high frequency signal for applying a sampling pulse signal to the dielectric substrate for a microwave integrated circuit. A microwave semiconductor device comprising a second microstrip line for applying an electric current, a slot line, and a coplanar line, the first microstrip line being substantially perpendicular to the front and back sides of a dielectric substrate. A slot line is cross-coupled and connected to the coplanar line, and two pairs of series bodies each consisting of a diode and a capacitor are arranged at the junction of the slot line and the coplanar line. A microwave semiconductor device comprising a series circuit in which one end is connected to a conductor portion in the middle of a line, the other end is connected to another conductor, and an output terminal is connected to an intermediate connection between the diode and the capacitor. 1 in which the cathodes of the diodes of one pair of series bodies and the anodes of diodes of the other pair of series bodies are directly connected, and the connection point thereof is connected to the middle conductor portion of the coplanar line, and is connected to the above output terminal. It is an object of the present invention to provide a microwave semiconductor device characterized in that the diode and capacitor are connected so that the pair of output lines does not intersect with the slit of the coplanar line.

[Example] An example of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 shows the overall circuit diagram of this embodiment, and FIG. 2 shows an enlarged view of the main parts of the connection between the coplanar line and the slot line. First and second microstrip lines 2 and 4 are provided on the front and back sides and propagate sampling pulses and microwave signals applied to the terminals 5 and 6, and the second microstrip lines are provided on the surface of the dielectric substrate 1 and A coplanar line 3 coupled to the first microstrip line 4 is provided on the surface of the dielectric substrate 1, cross-coupled to the first microstrip line 2 on the front and back sides, and a coplanar line 3 is connected to the coplanar line 3. A diode 8 is provided at the junction of the joined slot line 15 and the slot line 15 and the coplanar line 3.
A pair of series circuits 8, 8 formed by capacitors 11a, 11b and diodes 8a, 8b and capacitors 11a, 11b are connected via a resistor 13 to output lines 12a, 12b. and an output terminal 14 connected to the middle point of the resistor 13.

The slot line 15 has an effective slot line 15a and an invalid slot line 15b centered around the cross-coupling point of the first microstrip line 2, and a terminating resistor 7 is connected to the invalid slot line 15b. ing.

Next, a case will be described in which the microwave semiconductor device according to this embodiment is operated as a sampling phase detector. The propagation mode of the sampling pulse to the diode will be described. First, a sampling pulse applied to the terminal 5 is distributed from the microstrip line 2 to the valid and invalid slot lines 15a and 15b by the microstrip/slot line converter 16 and propagated. The pulse propagating through the invalid slot line 15b is
It is added to the terminating resistor 7 to reduce reflection of the incident pulse. The remaining power of the sampling pulse propagates through the effective slot line 15a and is applied to the diodes 8a, 8b provided at the junction between the effective slot line 15a and the coplanar line 3, thereby switching the diodes 8a, 8b.

On the other hand, a signal wave having a frequency that is an integral multiple of the repetition frequency of the sampling pulse is applied to the terminal 6, propagates through the microstrip line 4, and is transferred to the coplanar line 3 by the microstrip/coplanar line converter 9. is converted into an odd mode, and propagates through the coplanar line 3 in an odd mode.

The effective slot line 15a and the coplanar line 3
The junction with this is a T-branch as shown in FIG. Since the electric field of the sampling pulse is distributed as shown by the arrows in the figure and applied to both diodes 8a and 8b, if the T-branch is symmetrical, the phases of the electric fields applied to both diodes 8a and 8b are the same.
Therefore, there is no time difference between the sampling pulses applied to both diodes 8a and 8b.
The detection efficiency can be improved without decreasing as in the conventional case.

Furthermore, if the T-branches are made symmetrically, the sampling pulse will excite the coplanar line 3 only in even modes, and will not generate odd modes. Therefore, the amount of the sampling pulse leaking into the external circuit through which the signal wave propagates is much smaller than in the past.

In the above embodiment, the case where this microwave semiconductor device was operated as a sampling phase detector was explained, but this invention
The present invention is not limited thereto, and may be operated as a multiplication frequency mixer, and high-efficiency high-order multiplication frequency mixing can be performed similarly to the above embodiment.

[Effects of the invention] As explained above, the microwave semiconductor device according to the invention includes a pair of series circuits in which a diode and a capacitor are connected in series, each of which is connected to an intermediate connection between the diode and the capacitor. Since the output line does not intersect with the slot line, it is possible to equalize the phase of the sampling pulses applied to each diode in the series circuit, which improves detection efficiency and improves detection efficiency when used as a phase detector. When used as a frequency multiplication mixer, it has the effect of achieving high-order multiplication with high efficiency. It also has the effect of minimizing the amount of sampling pulses leaking into the signal line.

[Brief explanation of the drawing]

Fig. 1 is an overall circuit diagram of an embodiment of the microwave semiconductor device according to this invention, Fig. 2 is an enlarged view of the main part of the connection between the coplanar line and the slot line, and Fig. 3 is the structure of a conventional microwave semiconductor device. , Figure 4 is the third
5 shows the structure of the present invention, FIG. 6 shows an equivalent circuit of the device shown in FIG. 5, and FIG. 7 shows an equivalent circuit of the conventional device. 1... Dielectric substrate, 2, 4... Microstrip line, 3... Coplanar line, 5, 6, 14...
...Terminal, 7, 10...Terminal resistor, 8a, 8b...
Diode, 9... Microstrip coplanar line converter, 11a, 11b... Capacitor,
15...Slot line, 16...Microstrip/slot line converter.

Claims (1)

[Scope of utility model registration request] A first microstrip line for applying a sampling pulse signal, a second microstrip line for applying a high frequency signal, a slot line, and a coplanar line are provided on a dielectric substrate for a microwave integrated circuit. A microwave semiconductor device comprising: a slot line cross-coupled to the first microstrip line on the front and back sides of a dielectric substrate at a substantially right angle and joined to the coplanar line;
Two pairs of series bodies consisting of a diode and a capacitor are arranged at the junction of the slot line and the coplanar line, and each of the two pairs of series bodies has one end connected to the middle conductor part of the coplanar line and the other end connected to ground. In a microwave semiconductor device comprising a series circuit connected to a conductor and having an output terminal connected to an intermediate connection between the diode and a capacitor, the cathode of the series diode of one pair and the series circuit of the other pair are provided. The anode of the body diode is directly connected, and the connection point is connected to the middle conductor part of the coplanar line, and the output terminal is connected to the above output terminal.
A microwave semiconductor device characterized in that the diode and capacitor are connected so that the pair of output lines does not intersect with the slit of the coplanar line.