JPH01303706A - Inductance for mmic - Google Patents

Abstract

PURPOSE:To make it possible to bring electric characteristics in the same value when viewed from both input end and output end of a strip conductor by a method wherein the spatially intersecting part located in the middle of the strip conductor is provided in the shape and on the position symmetrical from both the input end and the output end of the strip conductor. CONSTITUTION:As a strip conductor 1 on the surface of a dielectric substrate is spatially intersected in the midway of it, the miniaturization of the strip conductor can be accomplished. The spatially intersecting parts 21 and 22 of the strip conductor 1 are arranged in such a manner that they are structually provided on the position symmetrical from both input terminal 3 and output terminal 4. As a result, the inductance value viewed from the input terminal and the inductance value viewed from the output terminal becomes equal. Also, the appraisal of a transmission line becomes easy, and a highly precise design of various microwave circuits can be made possible.

Description

[Detailed Description of the Invention] [Summary] An inductance for an IC between MMICs formed in a spiral shape by spatially intersecting microstrip lines on the surface of a dielectric, electrical characteristics and output as seen from the end of the inductance for an IC between MMICs. The purpose is to maintain the symmetry of the characteristics seen from the end and to facilitate the evaluation of the characteristics. It is configured to be provided in a shape.

[Industrial application field]

The present invention is a miniaturized circuit MM of a microwave transmission line.
IC (Microwave Miniaturized)
This invention relates to the structure of inductance for integrated circuits.

[Conventional technology]

Conventional MMIC-to-IC inductance As shown in Figure 4, it is made of a meander line, which is made by bending a single strip conductor line 1 on the front surface of a dielectric substrate whose back side is grounded to reduce its size. Or, as shown in Figure 4B,
It is made of a spiral line in which strip conductor lines 1 are spatially crossed in the same direction midway to achieve miniaturization.

[Problem to be solved by the invention]

Conventional MMIC inductances are made and miniaturized using the two methods described above, but the method using the meander line shown in FIG.
Since the currents are directed in opposite directions, electromagnetic coupling occurs and the effective length is shorter than the physical length (which makes it difficult to obtain the required inductance value).

In addition, in the method using the spiral line shown in Figure 4B, due to the space wiring within the broken line in the figure, capacitance occurs between the crossing line conductors (side view), and when viewed from the input terminal IN and the output terminal O
There is a problem that symmetry of electrical characteristics does not hold when viewed from the UT.

The present invention aims to solve the above problems.

[Means to solve the problem]

The above problem is solved by the MM of a microwave transmission line having an input end 3 and an output end 4, which is formed by spatially intersecting strip conductor lines 1 in the middle and forming a spiral shape, as shown in FIG.
In an inductance for an IC, the problem is solved by the configuration of the present invention in which the spatially intersecting portions 2 of the strip conductor 1 are provided in a symmetrical manner at structurally symmetrical positions from both the input end 3 and the output end 4. be done.

In the principle diagram of FIG. 1 showing the structure of the inductance for MMIC of the present invention, 2 is a single strip conductor line provided on the surface of the dielectric substrate 1000 whose back surface is grounded.

Reference numeral 2 denotes a crossing portion where - strip conductor lines 1 spatially intersect in the middle.

3 is the input terminal of the inductance for MMIC, 4 is the MM
This is the output end of the IC inductance.

The strip conductor 1 is arranged so that the spatially intersecting portions 2 in the middle of the strip conductor 1 are provided at symmetrical positions from both the input end 3 and the output end 4 in a symmetrical manner.

[Effect]

The inductance for MMIC of the present invention can be made small because the strip conductors 1 spatially intersect in the middle, and the spatially intersecting portions 2 of the strip conductors 1 are structurally Since they are arranged in a symmetrical manner at symmetrical positions from both the end 3 and the output end 4, the inductance value of the electrical characteristics also differs from the input end 3 and the output end 4.
When viewed from both sides, the problem becomes the same and the problem is solved.

〔Example〕

FIG. 2 shows the structure of the MMrC inductance of the first embodiment of the present invention, and FIG. 3 shows the structure of the inductance of the second embodiment! 'll'
The structure of the inductance for lIc is shown.

In both the inductance of the first embodiment shown in FIG. 2 and the inductance of the second embodiment shown in FIG. It is possible to achieve a small size because the two sides intersect with each other. In addition, the spatially intersecting portion 2L22 of the strip conductor 1
are structurally arranged so that they are provided in symmetrical positions and shapes from both the input end 3 and the output end 4, so the electrical characteristics when viewed from the input end 3 and those seen from the output end 4 are There is no problem because the electrical characteristics of both cases are the same and the same value of inductance is obtained.

〔Effect of the invention〕

As explained above, according to the present invention, the inductance for MMIC can be reduced in size, and at the same time, the inductance value seen from the input end is the same as the inductance value seen from the output end, so evaluation of the transmission line of the MMIC can be achieved. In addition to making it easier to design various microwave circuits with higher accuracy, it also has a geometrically symmetrical structure, which has the effect of making it modular and making it easier to arrange the circuit design.

[Brief explanation of the drawing]

FIG. 1 is a principle diagram showing the structure of the inductance for MMIC of the present invention, and FIGS. MM of the second embodiment
FIG. 4 is a plan view showing the configuration of an inductance for an IC, and FIG. 4 is a configuration diagram of a conventional inductance for an MMIC. In the figure, l is a strip conductor, 2 is a crossing portion, 3 is an input end, and 4 is an output end. N7 2 ζ・'s structure 4 showing hand face drawing 2 Tuteng to Σ showing 1000 thousand festivals 3 ω AS A/7 stop Ling ε, also t'yHrc of H0iral yakushu to shushin Interview 77 lectures)
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Claims (1)

[Claims] One strip conductor line (1) provided on the front surface of a dielectric substrate whose back side is grounded is spatially crossed (2) in the middle.
The input end (3) and the output end (4) are formed into a spiral shape.
) in the MMIC inductance of a microwave transmission line, the spatially intersecting portion (2) of the strip conductor (1)
are provided in symmetrical positions and in a symmetrical form from both the input end (3) and the output end (4).
Inductance for IC.