JPS6242524B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a waveguide distributor suitable for use in, for example, a microwave heating irradiation antenna of a vacuum drying device.

Generally, a vacuum drying apparatus uses a microwave heating irradiation antenna. In this case, a plurality of antennas must be arranged and power must be supplied and distributed from one microwave oscillator, and an effective waveguide distributor is desired.

The present invention was made to satisfy the above-mentioned needs, and an object of the present invention is to provide a waveguide distributor that is inexpensive, improves productivity, and saves energy.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. The waveguide distributor of the present invention is constructed as shown in FIG. 1, with one end of a rectangular input waveguide 1 connected to a microwave oscillator 2 such as a magnetron, and the other end short-circuited. Furthermore, a plurality of branch waveguides 3, for example five, are connected to this waveguide 1 at predetermined intervals. In this case, the branch waveguide 3 is perpendicular to the waveguide 1 and connected to each other at their wide surfaces, and the area where the two overlap is a single plate, as is clear from FIG. A resonant slot 4 is drilled. Further, one end 3a of each branch waveguide 3 is short-circuited, and the other end serves as an output end facing the same direction, and P ₁ to _{P 5} indicate respective outputs. In this embodiment, the short-circuit end side of the waveguide 1 is shorter and the output end side is longer. Furthermore, the length of the resonant slot 4 is approximately 1/2 of the spatial wavelength, and the longitudinal direction is parallel to the input waveguide 1.
are provided parallel to the longitudinal direction, and their positions are offset from the center A where the tube axis of the waveguide 1 and the tube axis of the branch waveguide 3 intersect, as shown in FIG. Of course, it is also offset from each tube axis. Moreover, the interval between each resonance slot 4 is set to an integral multiple of approximately λg/2, and the interval between the resonance slot 4 located at the end and the short-circuited end 1a of the waveguide 1 is set to an odd multiple of approximately λg/4, that is, λg/4×(2n+1) (n is 0,
1, 2...). Further, the output is distributed approximately in proportion to the distance g between the resonant slot 4 and the tube axis of the waveguide 1. Incidentally, a large number of through holes (not shown) are bored in the wide surface of each branch waveguide 3 to serve as an antenna.

The waveguide distributor of the present invention is configured as described above and illustrated, and includes an input waveguide 1 connected to an oscillator 2, and a plurality of branch waveguides provided orthogonally to this waveguide 1. Since high frequency coupling is performed between the tube 3 and the resonant slot 4, there is no need to provide a pseudo load, which is required in commonly known directional couplers, and the advantage is that it is inexpensive and has almost no power loss.
This invention has the advantage that the degree of bonding, which is an absolute condition for microwave heating, can be increased.
Furthermore, in the case of uniform multi-branching as in the present invention, the dimensions of each resonant slot 4 may be the same, and therefore productivity is excellent. Further, in the present invention, there is no power loss at the terminal, and energy saving can be achieved. According to this invention, the outputs are P ₁ , P ₂ ,
When P ₃ , P ₄ , and P ₅ , a distributor such as P ₁ =P ₂ =P ₃ =P ₄ =P ₅ P ₁ <P ₂ <P ₃ <P ₄ <P ₅ can be easily realized.

In the above embodiment, each resonance slot 4 was located on one side of the tube axis of the waveguide 1, but as shown in FIG. 3, the resonance slots 4 are arranged alternately on both sides of the tube axis. It can also be configured as

Further, in the above embodiment, the output ends of each branch waveguide 3 are arranged in one direction, but the output ends may be arranged in both directions of the waveguide 1, if necessary.

As explained above, according to the present invention, a waveguide distributor of great industrial value can be provided.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing a waveguide distributor according to an embodiment of the present invention, and FIGS. 2 and 3 are plan views showing examples of slot positions in the waveguide distributor of the present invention. be. 1...Input waveguide, 2...Microwave oscillator, 3...
Branch waveguide, 4...resonant slot.

Claims (1)

[Claims] 1. An input waveguide connected to a microwave oscillator and a plurality of branch waveguides provided orthogonally to this waveguide are high-frequency coupled through resonance slots, and the above-mentioned The resonant slot has its longitudinal direction parallel to the longitudinal direction of the input waveguide and is located offset from each tube axis of the two waveguides, and the branch waveguide is short-circuited at the side opposite to the output end with respect to the slot. A waveguide distributor characterized by: 2. The waveguide distributor according to claim 1, wherein the spacing between each of the resonant slots is an integral multiple of approximately λg/2.