JPS5952901A - Microstrip line circuit device - Google Patents

Abstract

PURPOSE:To use a titled device even in case of a large current, by wire-bonding an Au wire which is narrower than electric conductor width of a microstrip line, to its strip line having a characteristic of high impedance. CONSTITUTION:An Au wire 4 is wire-bonded onto a microstrip line 3 for the bias. When a DC resistance portion of the microstrip line 3 and DC resistance of the Au wire 4 are connected in parallel, the composite resistance becomes low, and a voltage drop in case when a current flows is reduced. As for a microwave signal, an electric field is not concentrated on the center of the strip line 3, but is concentrated in the dielectric substrate onto both ends and the reverse side of the strip line, therefore, even if the Au wire 4 is installed onto the center of the strip line 3, no influence is exerted on a microwave signal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microstrip line circuit device that can be used for large currents.

Conventionally, there has been a circuit device using this microstrip line as shown in FIG. In the figure, (1)
is a dielectric substrate, (2) is a microwave coupling strip line formed on the dielectric substrate (1), and (3) is a bias microstrip line.

FIG. 2 is an enlarged cross-sectional view of the vicinity of the bias microstrip line (3), where (3a) is the conductor width of the bias microstrip line (3), and (3b) is the thickness of the conductor.

Next, the operation will be explained. Microstrip line +21. on dielectric substrate (1). In a microwave circuit device using +3), a thin microstrip line having a characteristic of -I impedance is used for matching. Specifically, the conductor width (3a) of the microstrip line (3) for supplying bias must be made as thin as possible so as not to affect the microwave signal. That is, the bias must be supplied using a microstrip line with a narrow conductor width.

Since the microstrip line is conventionally formed in this push strip line as described above, the current capacity L4 of the bias microstrip line is necessarily the same as the conductor width (3a) of the bias microstrip line (3). If too much current is passed, the microstrip line (3) itself will burn out and break, or the DC resistance of the microstrip line (3) itself is large, causing the current to There are drawbacks such as a large voltage drop when the current is applied.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above. The object of the present invention is to provide a microst 17 strip line circuit device that can be used even with large currents by wire-bonding an Au wire onto a strip line.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a sectional view corresponding to FIG. 2 of a microstrip line according to an embodiment of the present invention, and the same reference numerals as in FIG. 5B2 indicate the same parts. And (4) is a 4'Jl thin Aa wire C which is thinner than the width of the line (3) wire-bonded on the bias microstowag line PJf31.

Next, the operation will be explained. Dielectric substrate i1) J=
A bias microstrip line (3
), the area is determined by the conductor width (3a) and the thickness,
Since the bias current capacity is limited, the Au wire (4) is wire-bonded to the bias microstrip line (3). By applying this Au wire (4), the Au wire (4) becomes parallel to the microstrip line (3), so the current capacity of the AH wire (4) itself - 1it is the original microstrip line) Lag track (3
) is added to the current capacity of the microstrip line (
By connecting the DC resistance of 3) and the DC resistance of Au wire 5 wire (4) in parallel, the combined resistance is lowered, and the electric field is not concentrated at the center where the current flows, but at both ends of the strip line. , the microwave signal is not affected.

In the above embodiment, one Au wire, which is extremely thin compared to the strip line, is used, but several pieces of Au wire may be placed over the center of the strip line as long as it does not affect the microwave signal.

As described above, according to the present invention, since the wire is inserted at the center of the strip line,
This has the effect of making it possible to obtain string lines that can be used in large current capacity buildings, which has not been possible until now.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a conventional microstrip line circuit device, Fig. 2 is an enlarged cross-sectional view of the microstrip line circuit decoration of Fig. 1, and Fig. 3 is a microstrip line circuit according to an actual example of the present invention. This is an enlarged cross-sectional view of the device shown in Figure 2. (1)... Dielectric substrate, (2)... Strip line for microwave matching, (3)... Strip line for bias, (4)... Au wire. nam・mouth 1] - sign 1.71 phrase - 71 give no lp 1 say. Agent Shin Kuzuno -2 Figure 1 Figure 3

Claims (1)

[Claims] (1) A thin microstrip line with -H impedance characteristics formed on a dielectric substrate. A microstrip line circuit device comprising: an Au wire that is thinner than the width of the strip line wire-bonded onto the microstrip line.