JPS601963B2 - Waveguide-stripline converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a waveguide-strip line converter for extracting microwave signals from a waveguide to a microstrip line or from a microstrip line to a waveguide.

A converter having the configuration shown in FIG. 1 has been used as a converter between a waveguide and a microstrip line. A rectangular waveguide 1 is short-circuited with a short-circuiting plate 2, and a top strip conductor is inserted from the short-circuiting plate 2 at right angles to the H-plane through a slit provided on the waveguide surface at a distance approximately equal to the signal wavelength. By inserting a microstrip line consisting of a dielectric plate 4, a dielectric plate 4, and a back ground conductor 5 into the waveguide, removing the back ground conductor of the microstrip line within the waveguide, and changing the insertion depth of the tip of the strip line. , aiming to optimize the coupling between waveguides and microstrip lines. A disadvantage of this waveguide-stripline converter is that it requires adjustment by moving the microstrip line up and down to optimize the coupling, and this adjustment is difficult. In particular, as shown in FIG. 2, when the waveguide strip line converter is made smaller by using a tapered waveguide 6 with a narrower H-plane distance, the tip of the microstrip line 7 becomes smaller. Optimizing the insertion depth has become more difficult, which has been an obstacle to miniaturizing waveguide-to-stripline converters. SUMMARY OF THE INVENTION An object of the present invention is to provide a waveguide-stripline converter which eliminates the drawbacks of the above-mentioned secondary technology, has a simple structure, does not require adjustment, and is easy to downsize.

In order to achieve the above object, the present invention inserts a part of a loop microstrip line into a waveguide, and magnetically couples the loop line of the microstrip line from an air gap line provided on the back conductor of the microstrip line. In order to excite two signals that are in opposite phases and propagate in opposite directions,
The output line of the microstrip is connected to a position where these two transmission signals are in phase on the loop.

This creates a small waveguide that does not require adjustment.
A stripline converter can be constructed. FIG. 3 is a diagram illustrating the principle of the present invention, in which a microstrip line 8 is passed perpendicularly to the H-plane of the waveguide at a distance of a certain wavelength from the short-circuit plate of the waveguide 1 at the short-circuit end. If the back conductor 9 of the microstrip line is removed only inside the microstrip line, the magnetic field of the signal propagating through the waveguide will combine with the strip line 8 that crosses the waveguide because the waveguide is short-circuited, causing the microstrip line to become The signal is propagated through.

At this time, the signal is divided into two, and the signals propagated to the output terminals 10 and 11 of the microstrip line are in opposite phases to each other. Therefore, if one of the output microstrip lines is lengthened by the back wavelength of the signal, the signals at the output ends will be in phase with each other. Connect these two output devices to create a loop, and connect another microstrip line at this connection point. Once connected, signals can be efficiently extracted from the connected microstrip lines. FIG. 4 shows an embodiment of the waveguide-stripline converter of the present invention. At a position away from the short-circuit surface of the short-circuited waveguide 1 and the length of the signal, a microstrip line 8 without a ground conductor on the back side is passed through the waveguide at a right angle to the H-plane of the waveguide, and the microstrip line 10 The microstrip line 11 is made longer by the length of the signal chair, the microstrip lines 10 and 11 are connected outside the waveguide, and the output microstrip line 1 is connected to this connection point.
2, the signal transmitted through the waveguide 1 is excited by the microstrip line 8, distributed to the microstrip lines 10 and 11, and transmitted, and the divided signals are combined and transmitted to the microstrip line 8. It is output from the strip line 12, and has the effect of efficiently converting the signal from the waveguide to the microstrip line, and does not require adjustment. FIG. 5 shows a modification of the present invention, and the effect is the same even if a tapered waveguide 13 is used. Figure 6,
FIG. 7 is also a diagram showing a modification of the present invention, and FIG. 6 shows that in the conversion section of the above embodiment, the width of the gap 15 of the ground conductor on the hair surface is narrower than the height of the waveguide wall 14. A rigid line with a short-terminated end is formed using the air gap pattern, and a microstrip line 17 for conversion is crossed at right angles to the length direction of the air gap at the point returning from the short-circuited terminal 16 of this rigid line to the shore wavelength input side of the signal. This structure requires no adjustment and has the advantage of being able to be formed into a compact size.

FIG. 7 shows a case in which a metal conductor plate 18 is used as a blind ground conductor forming a ridge line, and it is clear that the effect is the same in this case as well. As described below, a ridge line with a short-circuited end is formed using the back ground conductor of a microstrip line inserted perpendicularly to the H-plane of the waveguide, and the short-circuited surface of the ridge is placed at a distance of the wavelength of the signal. A configuration is used in which one of the microstrip lines perpendicular to the ridge line is made longer in the signal wavelength, the tips of the microstrip lines are connected to form a loop, and the output microstrip line is connected to this connection point. As a result, a small waveguide-to-strip line converter without adjustment can be constructed with a simple configuration.

[Brief explanation of the drawing]

1 and 2 are a perspective view and a sectional view showing a conventional example of a waveguide-strip line converter, FIG. 3 is a perspective view for explaining the operation of the present invention, and FIG. 4 is a perspective view according to the present invention. FIGS. 5, 6, and 7 are perspective views showing one embodiment of a waveguide-strip line converter, and side views showing modifications of the present invention. 1... Rectangular waveguide, 3... Strip conductor, 4... Dielectric plate, 5... Back ground conductor, 7, 8, 10, 11, 12, 17...Microstrip line, 15...Ground conductor gap line, 18...
...Metal plate ground conductor plate. 1 animal, ○ years old, 2 figures. Juice 3 figure O4 figure 54 year old ku honeyq O7 figure

Claims (1)

[Claims] 1 In a microstrip line consisting of a ground conductor on the back side of a dielectric plate and a strip line on the top side, a loop is formed with the strip line on the top side of the dielectric plate, and an output strip line is connected to this loop from outside the loop. and from this connection point along the loop to the ground conductor on the back side centered at a point on the loop with a distance difference of 1/2 wavelength of the high frequency signal, intersecting the strip line of the loop at right angles, A gap is formed from the end of the dielectric plate toward the inside of the loop, with a length that includes approximately 1/4 wavelength of the high-frequency signal entering the inside of the loop, and a width that is equal to or smaller than the height of the E-plane inner wall of the rectangular waveguide. ,
The microstrip circuit is placed in the rectangular waveguide at a position that is perpendicular to the H-plane and parallel to the E-plane and bisects the waveguide. A waveguide-strip line converter characterized by a configuration in which the waveguide is inserted so as to form a transmission line parallel to the H-plane of the waveguide.