CN113856058A

CN113856058A - Double helix microwave cavity radiator

Info

Publication number: CN113856058A
Application number: CN202111273977.7A
Authority: CN
Inventors: 闫树伟; 周立波; 孙历朝
Original assignee: Dalian Auretech Technology Co ltd
Current assignee: Dalian Auretech Technology Co ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2021-12-31

Abstract

The double-helix microwave cavity radiator is characterized in that one end of an inner conductor of a hard coaxial line is connected with an inner helical line, one end of an outer conductor of the hard coaxial line is connected with an outer helical line, the outer helical line is positioned outside the inner helical line, and the helical pitches of the outer helical line are different. The double-helix microwave cavity radiator of the invention has the advantages that the spiral lines are respectively connected with the end parts of the inner conductor and the outer conductor of the coaxial line, thereby not only reducing the volume, but also leading the microwave to be concentrated on the front end for radiation, and obviously improving the radiation efficiency.

Description

Double helix microwave cavity radiator

Technical Field

The invention relates to the technical field of medical equipment.

Background

Tumor thermotherapy, which is a method for raising the temperature of the whole body or tumor tissues (local) by various methods and treating malignant tumors by utilizing the heat action and secondary effects thereof, is the fifth therapy after surgery, radiotherapy, chemotherapy and immunotherapy and is a green treatment means.

Tumor thermotherapy, based on modern science, was activated in the early 60 s of the 20 th century and has made many breakthrough advances. A large number of in vitro experiments and clinical data show that the tumor thermotherapy has obvious synergistic and supplementary effects on tumor treatment means such as chemotherapy, radiotherapy and operation, although the tumor thermotherapy can not replace the operation, the chemotherapy or the radiotherapy as an independent tumor treatment scheme. Because of this, tumor hyperthermia has rapidly developed in recent years, becoming another important tumor treatment means following surgery, radiotherapy, chemotherapy, and biotherapy.

For thermotherapy of the cavity, the conventional cavity radiator is mainly divided into two types, the first type is as shown in fig. 1 and fig. 2, one end of a rigid coaxial line 1 is oppositely provided with a quarter-long slit, the front end of the rigid coaxial line is short-circuited and is fed from the side, and the vertex of the front end can not radiate energy. Another type of cavity radiator is shown in fig. 3 and 4, where the flexible coaxial line 5 is fed at the outgoing conductor section and cannot radiate at the front end. However, in practical therapeutic applications, many treatments require front-end radiation, which limits the therapeutic effect and reduces the radiation efficiency.

Disclosure of Invention

The invention provides a double-helix microwave cavity radiator, aiming at solving the problems that the end part of the existing cavity radiator can not radiate and the like.

The technical scheme adopted by the invention for realizing the purpose is as follows: a double-helix microwave cavity radiator is characterized in that one end of an inner conductor 7 of a hard coaxial line 1 is connected with an inner helix 9, one end of an outer conductor 2 of the hard coaxial line 1 is connected with an outer helix 10, the outer helix 10 is located outside the inner helix 9, and the helical pitches of the outer helix 10 are different.

The total length of the inner spiral 9 is 1/4 of the wavelength of the microwave, and the spiral pitches of the inner spiral 9 are the same.

The hard coaxial line 1 and the outer spiral line 10 are externally provided with a shell 4.

The inner spiral wire 9 and the outer spiral wire 10 are copper-plated silver wires.

The outer spiral wire 10 has a structure in which the pitch of the spiral decreases from the bottom to the top.

One end of the inner spiral line 9 is welded with one end of the inner conductor 7; one end of the outer spiral wire 10 is welded to the outer conductor 2.

And a microwave waveguide cylinder 8 is arranged at the upper end of the hard coaxial line 1 and positioned outside the outer spiral line 10.

The double-helix microwave cavity radiator of the invention has the advantages that the spiral lines are respectively connected with the end parts of the inner conductor and the outer conductor of the coaxial line, thereby not only reducing the volume, but also leading the microwave to be concentrated on the front end for radiation, and obviously improving the radiation efficiency.

Drawings

Fig. 1 is a structural view of a first conventional cavity radiator.

Fig. 2 is a structural view of a conventional first channel radiator housing.

Fig. 3 is a structural view of a second conventional cavity radiator.

Fig. 4 is a structural view of a conventional second channel radiator housing.

FIG. 5 is a structural diagram of the double helix microwave cavity radiator of the present invention.

FIG. 6 is a structural diagram of the housing of the double helix microwave cavity radiator of the present invention.

In the figure: 1. the coaxial cable comprises a hard coaxial cable, 2, an outer conductor, 3, a seam, 4, a shell, 5, a soft coaxial cable, 6, an insulator, 7, an inner conductor, 8, a microwave guide cylinder, 9, an inner spiral wire, 10, an outer spiral wire, 11, an outer insulator, 12, a coaxial cable interface, 13 and a radio frequency end.

Detailed Description

The structure of the double helix microwave cavity radiator of the invention is shown in figure 1, the hard coaxial line 1 is provided with an inner conductor 7 at the center, an outer conductor 2 is arranged outside the inner conductor, an insulator 6 is arranged between the inner conductor 1 and the outer conductor 2, and an outer insulator 11 is arranged outside the outer conductor 2.

The inner helical wire 9 is welded at one end of the inner conductor 7 of the hard coaxial wire 1, the total length of the inner helical wire 9 is 1/4 of the wavelength of microwave, about 8cm, and the helical pitches of the inner helical wire 9 are the same. An outer spiral wire 10 is welded at one end of an outer conductor 2 of the hard coaxial wire 1, the outer spiral wire 10 is positioned outside an inner spiral wire 9, the spiral pitches of the outer spiral wire 10 are different, the outer spiral wire 10 is of a structure with the spiral pitches decreasing from bottom to top, and the inner spiral wire 9 and the outer spiral wire 10 are copper-plated silver wires. The upper end of the hard coaxial line 1 is provided with a microwave guide cylinder 8 outside the outer spiral line 10. The hard coaxial wire 1 and the outer spiral wire 10 are externally provided with a shell 4, and the upper end of the shell is a radio frequency end 13, as shown in figure 2. The lower end of the hard coaxial line 1 is connected with a coaxial line interface 12, and the hard coaxial line 1 is connected with a radio frequency cable of a radio frequency generating device through the coaxial line interface 12.

When the microwave radiator is used, the microwave generated by the radio frequency generating device enters a hard coaxial line 1, 75 ohm coaxial distribution state from the coaxial line interface 12, the radio frequency signal is transmitted to the other end and is converted into an internal spiral parallel line balanced feed state, because the spiral spacing density of the external spiral line 10 is different, the impedance matching of the parallel line and the coaxial line is realized, the parallel line is curled into a spiral shape, the volume of the radiator is reduced, the microwave is concentrated on the front end radiation, through tests, the standing wave of the radiator is less than or equal to 2.2, the radiator is smaller than that of the radiator with the same volume, and the radiation efficiency is obviously improved.

While the invention has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. Double helix microwave cavity way radiator, its characterized in that: one end of an inner conductor (7) of the hard coaxial wire (1) is connected with an inner spiral wire (9), one end of an outer conductor (2) of the hard coaxial wire (1) is connected with an outer spiral wire (10), the outer spiral wire (10) is positioned outside the inner spiral wire (9), and the spiral pitches of the outer spiral wire (10) are different.

2. The double helix microwave cavity radiator of claim 1, wherein: the total length of the inner spiral (9) is 1/4 of the wavelength of the microwave, and the spiral pitches of the inner spiral (9) are the same.

3. The double helix microwave cavity radiator of claim 1, wherein: and a shell (4) is arranged outside the hard coaxial wire (1) and the outer spiral wire (10).

4. The double helix microwave cavity radiator of claim 1, wherein: the inner spiral line (9) and the outer spiral line (10) are copper-plated silver wires.

5. The double helix microwave cavity radiator of claim 1, wherein: the outer spiral line (10) has a structure in which the pitch of the spiral decreases from the bottom to the top.

6. The double helix microwave cavity radiator of claim 1, wherein: one end of the inner spiral line (9) is welded with one end of the inner conductor (7); one end of the external spiral line (10) is welded with the external conductor (2).

7. The double helix microwave cavity radiator of claim 1, wherein: and a microwave wave guide cylinder (8) is arranged at the upper end of the hard coaxial line (1) and positioned outside the outer spiral line (10).