JPS5830762B2 - Microstripline-dielectric system line converter - Google Patents

Description

Detailed Description of the Invention The present invention provides a microstrip line in which a dielectric substrate is placed on a ground conductor, and an IJ tube conductor is placed on the dielectric substrate; a dielectric line having a dielectric rod; This invention relates to a microstrip line-to-dielectric line converter that is placed between a dielectric line such as an image line or an insular guide.

Conventionally, millimeter-wave hybrid integrated circuits are micros)
It was composed of an IJ tube line or a dielectric line (for example, a dielectric line, an image line, an insular guide).

However, when a circuit is constructed using only microstrip lines, the loss increases as the frequency increases, and when a circuit is constructed using a dielectric line, it is difficult to couple the diode and the line, so it is necessary to install a diode. In order to
There were drawbacks such as the need to convert the dielectric line to a waveguide.

Figure 1a shows a conventional microstrip line, where 1 is a strip conductor, 2 is a dielectric substrate with a dielectric constant, and 3 is a ground conductor, and a signal is transmitted from terminal part A to terminal part B. Ru.

Figure 1 shows a receive mixer as an example of an integrated circuit.
This shows a configuration using the microstrip line shown in Figure a. In the figure, 4 is a diode, 5 is a low-pass filter, 6 is a matching circuit, C is an input terminal portion, and D is an IF output terminal portion. .

The signal and local oscillation signal inputted from the input terminal portion C are frequency-converted by the diode 4, and the frequency difference between the signal and the local oscillation signal is extracted from the IF output terminal portion.

Here, the low-pass filter 5 prevents high-frequency signals from leaking to the output side, and the matching circuit 6 matches the diode 4 and the line.

However, if the entire circuit including the coupling circuit between the signal and the local oscillation signal is constructed from a microstrip line, there is a drawback that the loss of the circuit increases as the frequency increases due to the low Q of the microstrip line.

Next, FIGS. 2a and 2d show various forms of dielectric system lines. FIG. It shows an image line where 7 is placed.

Figure 2C shows an example of an insular guide, with the ground conductor 3
A dielectric sheet 8 having a dielectric constant of E3 (IF2>E73) is adhered thereon, and a dielectric rod 7 having a dielectric constant is placed on the dielectric sheet 8.
Place.

FIG. 2d shows an example of a receiving mixer using an image line as shown in FIG. 2, where 9 is a waveguide and 10
is a short circuit plate, and 11 is a waveguide image line converter.

E is an input terminal portion, F is an IP output terminal portion, and at the same time serves as a DC bias supply terminal.

The signal input from the terminal portion E and the local oscillation signal are once converted into waveguide mode by the waveguide-image line converter 11, and then frequency-converted by the diode 4.
It is taken out as an output from the terminal portion F.

In that case, the low-pass filter 5 prevents the millimeter wave signal from leaking to the IF side, as in the case of FIG.

In addition, the distance between the shorting plate 10 and the diode 4 is adjusted,
It is used to match the diode 4 and the line.

In this way, when constructing a millimeter-wave hybrid integrated circuit using a dielectric system line, it is difficult to directly couple the diode to the dielectric system line, so the part where the diode is installed must be converted into a waveguide. However, the disadvantage is that the circuit becomes larger and more difficult to manufacture.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate the above-mentioned disadvantages by actively utilizing the respective advantages of microstrip lines and dielectric lines, and to
An object of the present invention is to provide a microstrip line-dielectric system line converter that can configure an integrated circuit for millimeter wave bands.

To this end, in the present invention, the width of the strip conductor of the microstrip line and the width of the dielectric substrate are gradually reduced so that the tapered tip of the dielectric substrate is connected to the dielectric rod of the dielectric line. By terminating the tapered tip of the IJ tube conductor with a finite length, the microstrip line is configured to be converted into a dielectric line (dielectric line, image line, insular guide).

The present invention will be described in detail below with reference to the drawings.

Figures 3a to 3C illustrate embodiments of the invention, where Figure 3a
is a microstrip line to image line converter,
FIG. 3 shows an example of a microstrip line-dielectric line converter, and FIG. 3C shows an example of a microstrip line-insular guide converter.

In FIG. 3a, a strip conductor 1, a dielectric substrate 2 having a dielectric constant, and a ground conductor 3 constitute a microstrip line.

An image line is constituted by a dielectric rod 7 having a dielectric constant and a ground conductor 3 common to the microstrip line.

Furthermore, in FIG. 3a, the extension portion 2A of the microstrip line dielectric substrate 2 on the ground conductor 3 is formed into a tapered shape so that the substrate width gradually narrows in the direction of extension.
The cross-sectional shape of the extended portion of the two tapered dielectric members is made the same as the cross-sectional shape of the dielectric rod 7 of the image line, and the two are connected.

One extension of the strip conductor 1 is formed into a tapered shape so that the conductor width gradually narrows in the direction of extension, and the tapered tip is terminated at a finite length to form a wedge shape as shown in Figure 3a. One conductor is used to form a converter from a microstrip line to an image line.

In the example shown in Figure 3, a strip conductor 1, a dielectric substrate 2 with a dielectric constant, and a ground conductor 3 constitute a microslot I-IJ tube line, and a dielectric line is formed with a dielectric rod 7 with a dielectric constant. Form.

The point that a tapered extension part is formed in the microstrip line by the tapered conductor part 1A and the two tapered dielectric parts is similar to the example shown in FIG. The conductors 3 and 3A (in Fig. 3a, the conductors 3 and 3A are shaded to distinguish them from the dielectric substrate 2°2A) are also formed in a tapered shape so that the width gradually narrows in the direction of extension. The tip of the tapered ground conductor 3A is cut off and terminated in alignment with the tip of the tapered conductor portion 1A, thereby forming a conversion portion from a strip line to a dielectric line.

In the example of FIG. 3C, the sl-IJ tube conductor 1, the dielectric substrate 2 to the dielectric constant, the ground conductor 3, and the dielectric constant ε3 inserted between the dielectric substrate 2 and the ground conductor 3. The dielectric sheet 8 of (E3) constitutes a double-structured microstrip line, and the ground conductor 3 common to this microstrip line, the dielectric sheet 8, and the dielectric constant E2 (E2>5
3) and the dielectric rod 7 constitute an insular guide.

The two extension parts of the dielectric substrate 2 for microstrip line are formed into a tapered shape so that the substrate width gradually narrows in the direction of extension, and the cross-sectional shape of the tip of the tapered dielectric part 2A is shaped like that of an insulator guide. The cross-sectional shape is the same as that of the dielectric rod 7, and the two are connected.

One extension of the strip conductor 1 is formed into a tapered shape so that the width gradually narrows in the direction of extension, and the tapered tip is terminated at a finite length to form a wedge-shaped conductor as shown in FIG. 3C. A section is formed, thereby forming a section for converting a microstrip line into an insular guide.

According to this configuration, the electromagnetic field distribution of the microstrip line and the electromagnetic field distribution of the dielectric system line are almost the same distribution, and the impedance of the microstrip line can be increased by reducing the strip width. By gradually reducing the strip width of the microstrip line and providing a taper between the microstrip line and the dielectric system line, a conversion circuit for both can be realized.

To operate the converter of the present invention having such a configuration, a signal is input to either the terminal portion on the microstrip line or the dielectric line side, and the signal is extracted from the other terminal portion.

Next, FIG. 4 shows an example in which an integrated reception mixer is constructed using the microstrip line-to-image line converter shown in FIG. 3a.

In Fig. 4, 1 is a strip conductor of a microstrip line, 2 is a dielectric substrate, 3 is a ground conductor, 4 is a diode, 5 is a low-pass filter, 6 is a matching circuit, 12 is a DC supply terminal, and 13 is a micro This is a converter between strip lines and image lines.

The received signal and local oscillation signal input from the terminal portion G of the image line are converted into the mode of the micros I-'J tube line by the converter 13.

Next, the frequency of the difference between the received signal and the local oscillation signal is converted by the diode 4 and taken out as an output from the terminal section H. At this time, the low-pass filter 5
This prevents it from leaking to the P side (toward the terminal portion H).

Further, the matching circuit 6 matches the diode 4 and the line.

In this way, microstrip line-dielectric system line (
When the circuit is configured using a converter (in the example shown in Fig. 4), the signal separation and coupling circuit can be configured with a dielectric system line, and the no-load Q of the dielectric system line is 'Since it is larger than the no-load Q of the J-tube line, the loss of the circuit can be reduced by that much compared to the case where the entire structure is made of microstrip lines.

Therefore, the microstrip line-to-dielectric system line converter according to the present invention can be applied as a partial circuit of an integrated circuit in a high frequency band such as a millimeter wave band.

In addition, in the present invention, the dielectric substrate 2 and the dielectric rod 7 may have a dielectric constant and may be integrally formed, or may be formed as 5\~ and both may be formed separately. May be connected.

When connecting the dielectric substrate 2 and the dielectric rod 7 as in the latter case, the cross-sectional shapes of the connecting portions of the two should not only be made the same, but also slightly shifted without any problem.

In addition, the finite length tip of the tapered portion 1A of the strip conductor 1 not only terminates at the boundary between the dielectric substrate 2 and the dielectric rod 7, as shown in FIG. It may be terminated either on the dielectric substrate 2 side or on the dielectric rod γ side beyond the boundary.

As explained above, according to the microstrip line-dielectric system line converter of the present invention, it is possible to easily convert between a microstrip line and a dielectric system line, so the advantages of both line types can be actively utilized. It is possible to construct a circuit with

For example, when configuring a millimeter-wave IC reception mixer, the loss of the microstrip line becomes large in high-frequency bands such as the millimeter-wave band, so the coupling circuit between the signal and the local oscillation signal must be made using a low-loss dielectric, even in the high-frequency band. Using the system line,
If the diode is used to convert a dielectric line into a microstrip line using this converter and then connect it to the line, the loss of the circuit will be reduced compared to when the entire diode is configured with a microstrip line. ” 1 can be written,
Diodes can also be easily coupled to the line.

Furthermore, since both microstrip lines and dielectric lines have planar configurations, they are advantageous in terms of circuit shaping and manufacturability. It is also applicable to

[Brief explanation of the drawing]

FIG. 1a is a perspective view showing a conventional microstrip line, FIG. Figure 2 is a perspective view of the dielectric line, Figure 2 C is a perspective view of the insular guide, Figure 2 d is a line showing a receiving mixer constructed using image lines. Figure 3a is a perspective view showing a configuration example of a microstrip line image line converter as an example of the microstrip line-dielectric system line converter of the present invention, and Figure 3a is a microstrip line-dielectric system line converter of the present invention. FIG. 3C is a perspective view showing an example of a line converter, FIG. 3C is a perspective view showing an example of a microstrip line-insular guide converter of the present invention, and FIG. FIG. 2 is a perspective view showing an example of an integrated reception mixer constructed using the above-mentioned integrated reception mixer. 1... Strip conductor, 2... Dielectric substrate, 3... Ground conductor, 4... Diode, 5... Low pass Filter, 6...
・Matching circuit, 7...Dielectric rod, 8...
Dielectric sheet, 9... Waveguide, 10...
・Short circuit board, 11... Waveguide-image line converter, 12... DC supply terminal, 13...
・Microstrip line-image line converter,
1A...Tapered conductor part, 2A...Tapered dielectric part, 3A...Tapered ground conductor,
A, B, C, D, E, F. G, H...Terminal part.

Claims (1)

[Claims] 1 Microstrip line arranged between a microstrip line in which a dielectric substrate is placed on a ground conductor and a strip conductor is placed on the dielectric substrate, and a dielectric system line having a dielectric rod - dielectric system line In the converter, the dielectric substrate is provided with an extension portion, the dielectric extension portion is formed into a tapered shape so that the substrate width gradually narrows in the direction of extension, and the extension end portion of the dielectric extension portion is formed into a tapered shape. The strip conductor is connected to the dielectric rod, and the strip conductor is provided with a conductor extension part, and the conductor extension part is formed into a tapered shape so that the conductor width gradually becomes narrower in the same extension direction as the dielectric extension part. A microstrip line-to-dielectric system line converter characterized in that the tapered tip is terminated with a finite length.