JPS6053961B2 - microwave circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microwave circuit that can realize a microwave circuit with a simple configuration without requiring a waveguide converter.

Recently, research into miniaturizing microwave circuits has progressed, and technology for converting microwave circuits into ICs has been developed.

These microwave circuits are compactly constructed by metal-evaporating circuit elements using strip lines or slot lines on a dielectric substrate or a magnetic substrate. However, as strip lines and slot lines are inferior to waveguides in terms of loss, microwave devices using IC circuits generally have a combination of a waveguide as a transmission line and an IC circuit. The two are connected using a waveguide converter. Therefore, the entire device requires extra space for the waveguide transducer, and the loss of the transducer is also added. On the other hand, when constructing a microwave circuit element only with waveguides, conventionally,
Since the machining of the waveguide requires considerably advanced technology and processes, it is not suitable for mass production, and it is also difficult to miniaturize it. It is an object of the present invention to avoid the difficulty of manufacturing microwave circuit elements using such waveguides, to limit the processing of waveguides to a range that is extremely simple and can be mass-produced, and to The object of the present invention is to construct a microwave device that does not require a waveguide conversion section by inserting a rectangular single conductor plate in parallel, and to provide a small-sized microwave circuit that can be mass-produced with a small number of components. That is, in the microwave circuit of the present invention, a waveguide is equally divided parallel to the E plane of the waveguide, a substantially rectangular single conductor plate is sandwiched between the waveguides, and at least one resonance effect is applied to the single conductor plate. The present invention is characterized in that apertures exhibiting the above are provided, and the apertures are coupled to each other and the transmission range of the waveguide is coupled to each other. Therefore, since the microwave circuit of the present invention does not use an IC circuit, the transmission loss is limited to only the loss due to the wall current of the waveguide, which has the advantage of being extremely small. A value about 4 to 5 times higher than that obtained can be obtained.

Generally, when a conductor plate is inserted in the center of a waveguide, a cutoff frequency for electromagnetic waves in waveguide mode is obtained that is twice the cutoff frequency of the waveguide before insertion. Insertion of waveguide mode electromagnetic waves in the used frequency band creates a cutoff state, and no longer is directly transmitted to the output side.

The microwave circuit of the present invention configures a Tonami circuit by arranging an aperture that exhibits a resonant action on the conductor plate in the region where the cutoff state occurs, and frequency-selectively connecting the transmission range before and after the aperture. It was made so that
By sandwiching the conductive plate between the equally divided tube walls of the waveguide, the conductive plate can be attached extremely easily and reliably, and good contact can be obtained. In addition, in the present invention, since an opening with an accurate shape and size can be formed in advance in a single strong conductor plate through a simple and easy manufacturing process outside the waveguide, good frequency characteristics can be obtained. The present invention will be described in detail below with reference to the drawings.

First, in the basic configuration of the microwave circuit of the present invention shown in FIGS. A microwave p-wave circuit is constructed by inserting the conductor plate 1 into the waveguide 5 parallel to the E plane.

Next, to explain the operation of such a microwave door wave circuit, the input electromagnetic field 6 of the waveguide 5 is transmitted to the end 1 of the inserted conductor plate 1.
In a, it is constructed on the insertion conductor plate 1 and coupled with the Okinami circuit element 2, and the Okinami circuit element 2 is excited.

Since the insertion plate 1 is a conductor plate, the central part 1b of the insertion plate 1 is cut off for electromagnetic waves in the waveguide mode in the frequency band used, so the input electromagnetic wave of the waveguide 5 is cut off. The electromagnetic wave of the field mode 6 is sufficiently attenuated and the output side 7 of the waveguide 5
It is not directly combined with The electromagnetic energy that excited the Okiha circuit element 2 on the insertion plate 1 enters the Okiha circuit element 4 via the Okiha circuit element 3, and then the output side 7 of the waveguide 5.
Combine with. With this configuration, it is only necessary to perform the simple processing of inserting the conductor plate 1 into the waveguide 5, and the insertion plate 1 is processed outside the waveguide 5 to form the microwave circuit element. For example, a metal plate can be manufactured by punching, etc. Therefore, mass production is easy and it can also be made smaller. Next, an example of a specific configuration of the microwave circuit of the present invention will be explained. That is, FIG. 2 shows an example of the configuration of a bandpass filter in which a lumped constant resonator is provided on the conductor plate 1.

FIG. 2a is a sectional view of the waveguide 5 in this configuration example cut parallel to the E plane, and FIG. 2b is a sectional view of the waveguide 5 in a vertical plane. A conductor plate 1 is inserted into the center of the wave tube 5. This conductive plate 1 is provided with a resonator 8 formed by a slot, as shown in FIG. 2a. In this configuration example, the slot resonator 8 is formed by punching it into an H shape.
The resonator can have an appropriate shape, and the desired resonator can also be obtained by providing a rectangular or round opening. The central portion 8a of the H-shaped slot resonator 8 acts as a lumped constant capacitor, making it possible to downsize the slot resonator 8 and also facilitate frequency adjustment. With the structure shown in Figures 2A and 2B, a bandpass filter can be easily constructed by simply narrowing the conductor plate 1 between the two waveguides 5 and 5, as shown in Figure 3. Moreover, it can be easily configured and mass-produced. That is, the conductor plate 1 only needs to be punched out of a thin metal plate, and the waveguide 5 can be formed by molding a plastic material or the like with metal foil or plating it. good. Furthermore, if you want to move the filter position when adjusting the circuit, move the conductor plate 1 to the waveguide 5.
The circuit can be easily adjusted by moving it back and forth in the tube axis direction. If you want to make the band variable, as shown in Figure 1b, insert a second conductor plate 1'' parallel to the conductor plate 1, and form a slot resonator with the conductor plate 1''. The distance to the conductor plate 1 may be made variable by adjusting the distance. As is clear from the above-described configuration examples of the microwave circuit of the present invention, the microwave offshore circuit of the present invention has a simple configuration, and therefore is easy to manufacture and mass-produced.

In other words, as shown in Figure 3, the waveguide can be processed by simply dividing it into two parts parallel to the E plane, and the waveguide parts divided in this way can be easily formed using plastic material. The plastic member molded as the waveguide part can be plated or coated with metal foil, and the metal plate inserted inside can be formed only by punching, making it extremely suitable for mass production. suitable. In addition, since the edge of the single conductor plate inserted into the waveguide in contact with the waveguide transmission region is made into a straight line that is almost perpendicular to the waveguide axis, the transmission region of the slot mode on the conductor plate and the The inner tube area required for coupling with the wave tube transmission range can be significantly reduced compared to coupling using a normal tapered slot line.
The required microwave circuit can be configured extremely compactly. Furthermore, since the characteristics of the microwave door wave circuit according to the present invention are determined by the circuit arrangement on the conductor plate inserted into the waveguide, even if the waveguide is made of plastic or other material that expands and contracts with temperature, the characteristics will not change. There are few fluctuations. In addition, since the dividing plane of the waveguide that divides the waveguide into two is parallel to the E plane and at the center of the H plane, there is also the advantage that there is less leakage of current in the waveguide at the dividing plane. . Note that the conductor plate inserted into the waveguide parallel to plane E can be placed at the center of the waveguide if necessary, but in that case, the cutoff frequency for electromagnetic waves in waveguide mode does not become twice the cutoff frequency for electromagnetic waves in the waveguide mode before insertion.

Furthermore, the number of insertion conductor plates is not limited to one, for example, the first
As shown in Figure b, two or more sheets can also be inserted.

[Brief explanation of drawings]

Figures 1a and b are sectional views parallel to the E plane of the waveguide and sectional views perpendicular to the waveguide axis, respectively showing the basic configuration of the microwave circuit of the present invention, and Figures 2a and b are sectional views of the waveguide according to the present invention. FIG. 3 is a sectional view showing an example of the structure of a lumped constant bandpass filter according to the present invention, and FIG. 3 is an explanatory diagram of the assembly procedure thereof. 1, 1''...Conductor plate, 1a...End portion, 1b...Center portion, 2, 3, 4...Microwave night wave circuit element, 5.
... Waveguide, 6... Input side electromagnetic field, 7... Output side electromagnetic field, 8... Pull type resonator, 8a... Central part.

Claims (1)

[Claims] 1 A waveguide is equally divided parallel to the E plane of the waveguide, a substantially square single conductor plate is sandwiched between the two, and at least one opening exhibiting a resonant action is provided in the single conductor plate, and A microwave circuit characterized in that apertures are coupled to each other and each of the apertures and the waveguide are coupled to each other.