JPH0334701A - Bias supply element - Google Patents

Abstract

PURPOSE:To lower the operating frequency and to attain the miniaturization and circuit integration of the device by forming a disk lambda/4 open pattern as a spiral lambda/4 open line pattern and obtaining the operating wavelength depending on the circumferential length from that depending on the radial length within same mount areb. CONSTITUTION:One terminal of a coaxial lambda/4 line 1 is connected nearly perpendicularly to a signal line of a high frequency circuit comprising a strip line using an active element such as a transistor(TR) and the other terminal connected to a spiral lambda/4 line pattern 2a. The spiral lambda/4 open pattern 2a, a high frequency absorbing body 3 and a high frequency ground capacitor 4 are provided in the inside of a case 4 interrupting a high frequency leakage and connected in series with a core wire of the coaxial lambda/4 line 1. The open end of the high frequency ground capacitor 4 is provided with a bias supply terminal 6 connecting to a power supply. In this case, it is possible to response to the frequency lower than that of the bias supply element by using the spiral lambda/4 open line pattern 2a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bias supply element used in a microwave integrated circuit, and more particularly to a bias supply element that supplies a bias to an active element via a microstrip line.

[Conventional technology]

Conventionally, in microwave integrated circuits using active elements such as transistors, power is supplied to the active elements from the outside,
Microwave amplification etc. are performed.

In this case, it is necessary to supply power so as not to affect the high frequency characteristics of the microwave integrated circuit, and it is necessary to devise a power supply circuit, that is, a bias supply circuit.

In general, active elements used in microwave integrated circuits are
It has a terminal that shares the internal signal line and bias supply line, and in order to separate the signal and bias supply, the characteristics of the 174λ' line are adjusted so that the high frequency characteristics do not affect the signal line. Bias supply circuits using this technology are being tried.

As the miniaturization and integration of microwave integrated circuits progresses, instead of forming a bias supply circuit on the same plane, a λ/4 line is connected three-dimensionally perpendicular to the signal line, and this λ/4 line is connected vertically to the signal line.
There has been proposed a structure in which a structure for preventing parasitic oscillation of active elements, such as a circular λ/4 open group pattern and a high frequency absorber, is connected in series to the other end of the four lines.

Such a bias supply element is shown in FIG.

In FIG. 2, l is a coaxial λ/4 line, 3 is a high frequency absorber, 4 is a high frequency grounding capacitor, 5 is a case, 6 is a bias supply terminal, and 7 is a circular λ/4 open pattern.

A circular plate λ/4 open pattern 7, a high frequency absorber 3°, and a high frequency grounding capacitor 4 are provided inside the case 5, and the circular axis λ/4 is provided inside the case 5.
It is connected in series with the core wire of the 4-line 1, and the shield wire of the coaxial λ/4 line 1 is connected to the case 5 to provide a shielding effect.

The open end of the high frequency grounding capacitor 4 protrudes to the outside of the case 5, and is provided with a bias supply terminal 6 connected to a power source.

[Problem to be solved by the invention]

In the conventional bias supply element described above, coaxial λ/4
Since the operating wavelength is determined by the radius r of the disk λ/4 open pattern 70 disk followed by the line, if an attempt is made to lower the operating frequency, the radius r and the shape of case 5 must be increased. This hinders miniaturization of the bias supply element and limits the frequency of use for mounting.

SUMMARY OF THE INVENTION An object of the present invention is to provide a bias supply element which solves the above-mentioned drawbacks and enables low frequency operation without impairing the characteristics of the λ/4 open pattern and without changing the mounting shape.

[Means to solve the problem]

The bias supply element of the present invention includes a λ/4 line whose one end is connected to a signal line of a high frequency circuit configured with a microstritz line using active elements such as high frequency transistors, and the other end of the λ/4 line. a spiral λ/4 open line pattern connected to the λ/4 line, and a high frequency absorber and a high frequency grounding capacitor connected in series to the λ/4 line and the spiral λ/4 line open pattern. There is.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1(a) is a diagram showing the structure of one embodiment of the bias supply element of the present invention.

In the same figure, the bias supply element is a coaxial λ/4 line 1
．． Spiral-shaped λ/4 open pattern 2a, high frequency absorber 3.
High frequency grounding capacitor 4. It consists of a case 5 and a bias supply terminal 6.

The rear end of the coaxial λ/4 line is connected almost perpendicularly to the signal line of a high frequency circuit made up of strip lines using active elements such as transistors, and the other end is connected to a spiral λ/4 open pattern 2a. ing. The thinly wound λ/4 open pattern 2a, the high frequency absorber 3, and the high frequency grounding capacitor 4 are provided inside a case 5 that blocks high frequency leakage, and are connected in series to the core wire of the coaxial λ/4 line 1. .

A bias supply terminal 6 connected to a power source is provided at the open end of the high frequency grounded capacitor 4.

Further, FIG. 1(b) is a diagram showing the structure of another embodiment of the bias supply element of the present invention. In the same figure, 1(a)
Components that are the same as those in the figures are designated by the same reference numerals.

In this case, by using the spiral λ/4 open line pattern 2b, it is possible to support a frequency lower than that of the bias supply element shown in FIG. 1(a).

〔Effect of the invention〕

As explained above, in a bias supply element having a three-dimensional shape, by forming a spiral λ/4 open line pattern in the shape of a circular λ/4 open pattern, the radius length can be increased within the same mounting range. Since the operating wavelength is changed from the operating wavelength determined by the circumference to the operating wavelength determined by the circumference length, the wavelength of the operating frequency can be increased by that amount, making it possible to lower the operating frequency, which is effective in miniaturizing and integrating the device. There is.

[Brief explanation of drawings]

Figure 1 (a) is a diagram showing the structure of a bias supply element according to one embodiment of the present invention, Figure 1 (b) is a diagram showing the structure of a bias supply element according to another embodiment of the present invention, and Figure 2 1 is a diagram showing the structure of a conventional bias supply element. d, zb 1...Coaxial λ/4 line,) Fuhi...Spiral shaped λ
/4 open line pattern, 3... high frequency absorber,
4...High frequency grounding capacitor, 5...
Case, 6...)<Ias supply element, 7...
...Disc λ/4 open turn.

Claims (1)

[Claims] A λ/4 line whose one end is connected to a signal line of a high frequency circuit made up of a microstrip line using active elements such as high frequency transistors, and a λ/4 line connected to the other end of the λ/4 line. A spiral λ/4 open line pattern; a high frequency absorber and a high frequency grounding capacitor connected in series with the λ/4 line and the spiral λ/4 open line pattern. bias supply element.