JPH06132709A - Waveguide/strip line converter - Google Patents

Abstract

PURPOSE:To eliminate a coaxial line so as to reduce cost and to remove a loss on account of reflection and the like occurring at the connection part of the coaxial line so as to enlarge a band. CONSTITUTION:A square waveguide 1 where an opening for electromagnetic wave guide 6 is provided at one end and a terminal surface 3 at the other end, a dielectric substrate 2 which is vertically arranged at the side of the square waveguide 1 and a micro strip line 5 formed at the dielectric substrate 2 are provided. The signal conductor of the micro strip line 5 is extended and it is formed in almost a strip shape. Then, it is protruded into the square waveguide 1 and it is set to be a strip probe 4. The strip probe 4 is arranged so that the width direction of the strip probe 4 is aligned with the direction of the center axis of the square waveguide 1 and the longitudinal direction of the strip probe 4 faces the center axis of the square waveguide 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveguide circuit used in a microwave circuit and a converter between microstrip lines.

[0002]

2. Description of the Related Art In a conventional waveguide / strip line converter, as shown in FIG. 4, a rectangular waveguide 1 having an opening 6 for introducing an electromagnetic wave at one end and a terminating surface 3 at the other end is provided. , The probe 16 is perpendicular to the upper side surface of the rectangular waveguide 1.
Is inserted inside, and the strip line 18 provided on the surface of the dielectric plate 15 provided on the upper portion of the rectangular waveguide 1 and the probe 16 are connected via the coaxial line 17, and the rectangular waveguide 1 By coupling the electromagnetic waves introduced into the probe 16,
The probe 16 converts the signal into an electric signal and transmits it to the strip line 18 via the coaxial line 17.
So that it was input to the signal processing circuit.

[0003]

Accordingly, the probe 16
Since the coaxial line 17 is interposed between the strip line 18 and the strip line 18, the impedance formed by the mounting state of the probe 16 and the rectangular waveguide 1 in which the probe 16 is mounted and the impedance of the coaxial line 17 are connected. There is a problem that reflection occurs at the connection portion due to mismatching between the coaxial line 17 and the strip line 18, and a signal transmission loss occurs.
Further, there is a problem that the frequency band of the electromagnetic wave that can be coupled to the probe 16 is narrow. The present invention is
The signal conductor of the strip line is extended to form a substantially band shape to form a probe, and the electromagnetic wave is directly coupled to the probe to eliminate the coaxial line and reduce costs, and at the connection part of the coaxial line. The purpose of the present invention is to eliminate the loss caused by such reflections and to broaden the band of the waveguide / strip line converter.

[0004]

As shown in FIG. 1, a waveguide having an opening 6 for introducing an electromagnetic wave at one end and a terminating surface 3 at the other end (in the figure, a rectangular waveguide 1 ) And a dielectric substrate 2 arranged perpendicularly to the side surface of the rectangular waveguide 1 and a microstrip line 5 formed on the dielectric substrate 2, and a signal conductor of the microstrip line 5 is extended to be substantially formed. The band-shaped probe 4 is formed into a band-like shape and protrudes into the rectangular waveguide 1 to form a band-shaped probe 4, and the width direction of the band-shaped probe 4 is aligned with the tube axis (center axis) direction of the rectangular waveguide 1. The longitudinal direction of 4 is arranged so as to face the tube axis (center axis) of the rectangular waveguide 1.

[0005]

According to the present invention, the waveguide circuit is converted into a strip line by the above-mentioned structure, and the probe for coupling the electromagnetic wave is widened as the band-shaped probe 4, and the widthwise end is extended from one end. The distance to the end surface 3 is la, the distance from the other end to the end surface 3 is lb, and la and l
If the values of b are la = λa / 4 and lb = λb / 4,
Electromagnetic waves having wavelengths λa to λb can be efficiently coupled to the zigzag probe 4, so that the frequency band of electromagnetic waves converted by the waveguide / strip line converter can be widened, and Since the signal conductor of the microstrip line 5 is extended to form the substantially wavy probe 4 and the electromagnetic wave is directly coupled to the substantially wavy probe 4, the independent probe or the coaxial line like the conventional example is used. It is not necessary to use it, and it is possible to eliminate the loss that occurs in the mutual connection portion, and it is possible to reduce the cost.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a waveguide /
FIG. 2 is a partially cutaway perspective view of the stripline converter, and FIG. 2 is a front view of FIG. 1. Reference numeral 1 denotes a rectangular waveguide, one end of which serves as a flange 7 for connecting the waveguide, and the other end of which serves as a terminating surface 3 for reflecting electromagnetic waves introduced into the rectangular waveguide 1. An opening 6 having a long side and a short side in the vertical direction is provided. 2 is a dielectric substrate,
A microstrip line 5 is formed on the dielectric substrate 2 so that the microstrip line 5 can input a signal to a signal processing circuit. The dielectric substrate 2 is the waveguide 1
Of the microstrip line 5 is extended perpendicularly to the upper side surface of the microstrip line 5 to be formed into a substantially zigzag shape so as to project into the rectangular waveguide 1 to form a zigzag probe 4. 2 is aligned with the tube axis (center axis) direction of the same waveguide 1, and as shown in FIG. 2, the attachment position of the band-shaped probe 4 viewed from the opening 6 is the tube axis (center axis) of the opening 6. It is arranged to pass.

For example, it is assumed that a TE10 mode electromagnetic wave is introduced into the waveguide 1 through the opening 6. The TE10 mode electromagnetic wave has an electric field direction in the vertical direction, and the electric field distribution seen from the opening 6 is such that the central part is strong and the peripheral part is weak, and the attachment position of the band-shaped probe 4 is set to the opening 6. Since it is located in the center of
Electromagnetic waves can be coupled to the zigzag probe 4, and the attachment position of the zigzag probe 4 is about 1 / about from the end surface 3.
If they are arranged at the positions of four wavelengths, electromagnetic waves can be efficiently coupled to the band-shaped probe 4. Belt-shaped probe 4
Then, the electromagnetic wave is converted into an electric signal, and the electric signal is input to the signal processing circuit via the microstrip line 5 to perform signal processing.

The band-shaped probe 4 has a wide width,
If the distance from one end of the increased width to the end surface 3 is la, the distance from the other end to the end surface 3 is lb, and the values of la and lb are la = λa / 4, lb = λb / 4. Since electromagnetic waves having wavelengths λa to λb can be efficiently coupled to the same band-shaped probe 4, the frequency band of electromagnetic waves converted by the waveguide / strip line converter can be broadened. The values of la and lb are la =
λa × n / 4 and lb = λb × n / 4 may be set, and the value of n may be set to be an odd multiple. Further, the width of the band-shaped probe 4 is selected and determined so that a desired frequency band can be obtained, but it is desirable that the width does not exceed the value of λa / 4. The insertion depth N of the strip-shaped probe 4 into the waveguide 1 is adjusted and determined so that electromagnetic waves can be efficiently coupled.

FIG. 3 shows another embodiment of the present invention,
FIG. 2 is a partially cutaway perspective view of a waveguide / strip line converter, in which the same components as those shown in FIG. 1 are designated by the same symbols. The difference from the embodiment shown in FIG. 1 is that instead of using the rectangular waveguide 1, a circular waveguide 8 is used. As in the embodiment of FIG. 1, the zigzag probe 4 projecting into the circular waveguide 8 is aligned with the width direction of the central axis (tube axis) of the circular waveguide 8, and the zigzag shape seen from the opening 9. The band-shaped probe 4 is arranged so that the mounting position of the probe 4 passes through the center of the opening 9 and the distances from the terminal surface 10 are la and lb.

[0010]

As described above, according to the present invention,
Since the signal conductor of the microstrip line 5 is extended to form the substantially zigzag probe 4 and electromagnetic waves are directly coupled to the approximately zigzag probe 4, the use of an independent probe or a coaxial line as in the conventional example is used. Is unnecessary, the loss generated at the connection part can be eliminated and the cost can be reduced.Because the probe is formed in a band shape, the frequency band of the electromagnetic wave to be converted can be widened, and It greatly contributes to the performance improvement of the wave tube / strip line converter.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a waveguide / stripline converter showing an embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a partially cutaway perspective view of a waveguide / stripline converter showing another embodiment of the present invention.

FIG. 4 is a partially cutaway perspective view of a waveguide / stripline converter showing a conventional example.

[Explanation of symbols]

 1 Rectangular Waveguide 2 Dielectric Plate 3 End Surface 4 Wavy Probe 5 Microstrip Line 6 Opening 7 Flange 8 Circular Waveguide 9 Opening 10 End Surface 14 Notched Line 15 Dielectric Plate 16 Probe 17 Coaxial Line 18 Stripline

Claims (3)

[Claims] 1. A waveguide having an opening for introducing an electromagnetic wave at one end and a terminating surface at the other end, a dielectric substrate arranged perpendicular to a side surface of the waveguide, and formed on the dielectric substrate. The signal conductor of the microstrip line is extended to form a substantially striped shape and protrudes into the waveguide to form a striped probe. A waveguide / strip line converter characterized in that the longitudinal direction of the same band-shaped probe is arranged so as to face the tube axis of the same waveguide in accordance with the tube axis direction of. 2. The waveguide / strip line converter according to claim 1, wherein the waveguide is a rectangular waveguide. 3. A waveguide / stripline converter according to claim 1, wherein said waveguide comprises a circular waveguide.