JPS5814081B2 - Stripsenrohenkanki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a converter composed of a waveguide and a strip line, and its features are to propose a converter that achieves low loss and wide band.

First, a conventional converter will be explained.

Figure 1 shows a conventional stripline converter.
is a waveguide, 2 is a strip line, 3 is a strip line conductor that is part of the strip line, 4 is a dielectric substrate that is part of the strip line, 5 is a waveguide that supports the strip line, 6 is a short circuit It is a board.

This converter has a structure in which a suspended strip line 2 is inserted into the waveguide 1, and the dielectric substrate 4 of the strip line 2 is arranged in a plane parallel to the propagation axis of the waveguide 1. is attached to.

The operating principle of this converter is based on the capacitive susceptance that occurs between the tip of the strip line conductor 3 and the opposing wall of the waveguide 1, and the inductive susceptance that occurs when looking at the shorting plate 6 from the position of the strip line conductor 3. A resonant circuit is formed with the susceptance, and mode conversion is performed between a mode propagating in a waveguide and a mode propagating in a strip line via this resonant circuit.

Therefore, in order to obtain broadband characteristics with this converter, a large capacitive susceptance is required between the tip of the strip line conductor 3 and the wall of the waveguide 1.

However, in the conventional transducer described above, when attempting to obtain a large capacitive susceptance by widening the line width at the tip of the strip line conductor 3, the capacitive susceptance is distributed in the tube axis direction of the waveguide 1, resulting in It has the disadvantage that it is not possible to increase the capacitive susceptance and it is difficult to obtain broadband characteristics.

This invention aims to eliminate the above-mentioned drawbacks and provide a stripline transducer with low loss, no broadband, and a simple configuration.The main feature of this invention is that the waveguide is inserted into the plane containing the incident wave electric field and the propagation axis at the center of the waveguide. Mode conversion is performed through a partially tapered conductor plate.

FIG. 2 shows an embodiment of the present invention. In the figure, 7 is a conductor plate for converting the TEIO mode, which is the propagation mode of the rectangular waveguide 1, into the TEM mode, which is the propagation mode of the strip line 2. This converter has a converter between TEIO mode and TEOI mode, and a converter between TEo mode and TEO mode.
It consists of a converter with EM mode.

FIG. 3a shows TE, which is part of the converter.

This shows the conversion part between mode and TEo1 mode.If the electric field distribution at point A in the figure is T''10 mode as shown in figure 3b, the electric field distributions at points B and C in figure 3a are respectively The result will be as shown in Fig. 3C and d.

Therefore, TEJo mode at point A and two TEOs at point C.
Converted to I mode.

FIG. 4a shows a conversion section between the TEo mode and the TEM mode. In order to bring the impedance at point F in the figure close to the impedance of the strip line 2 in FIG. 2, the waveguide 8 of this conversion section is The plane perpendicular to the electric field (the height of the waveguide) is deformed into a tapered shape.

Further, the conductor plate 7 is tapered so that the width at point F is the same as the width of the strip line.

The electric field distributions at points D, E, and F in Figure 4a are as shown in Figure 5b, c, and d, respectively, so TEo at point D]
The mode is converted to TEM mode at point F.

In this way, the TE1o mode in the rectangular waveguide 1 shown in FIG.
Since the conversion can be carried out smoothly via the converter according to the present invention, low loss and wideband frequency characteristics can be obtained.

Further, in the converter according to the present invention, the conductor plate 7 can be constructed by closely adhering conductor foil to the dielectric substrate, so when constructing the strip line with the dielectric substrate, the conductor plate 7 and the strip line 2 are integrated. It can be manufactured as

[Brief explanation of the drawing]

Fig. 1 is a partially cut-out diagram showing a conventional strip line converter, Fig. 2 is an explanatory diagram of a strip line converter showing an embodiment of the present invention, and Fig. 3 a is a part of the converter. TE10
Explanatory diagram showing a conversion unit between mode and TEo, mode, 3rd
Figures b, c, and d are explanatory diagrams showing the electric field distribution in the waveguide in Figure 3 a, and Figure 4 a is an explanatory diagram showing the converter between TEO mode and TEM mode, which is part of the converter. , Fig. 4 b, c
, d are explanatory diagrams showing the electric field distribution in the waveguide shown in FIG. 6 is a short circuit plate, 7 is a conductor plate, and 8 is a tapered waveguide. Note that the same or corresponding parts in the figures are indicated by the same reference numerals.

Claims (1)

[Claims] 1. In a strip line converter composed of a waveguide and a strip line, the TEgo mode propagating through the waveguide in a plane including the incident electric field at the center of the waveguide and the propagation axis is integrated into two TEo, A first tapered conductor plate converts the TEO1 mode into a mode propagating through the strip line, and a second tapered conductor plate converts the TEO1 mode into a mode propagating through the strip line. A strip line converter characterized in that the waveguide of the conversion section is a tapered waveguide.