JPS633216Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a microstripline circulator, and more specifically, a microstripline circulator equipped with a radio wave absorber suitable for use in a microwave complex circuit. Regarding.

A conventional microstrip line circulator used in the microwave band has a microstrip line circulator on one side 1A of a ferrimagnetic substrate 1 such as a ferrite substrate, as shown in FIGS. 1a and 1b. A pattern is provided, and a magnet 2 is provided on the ground conductor surface 1B side of the other surface of the substrate via a magnetic field adjusting spacer 3.

In microwave communication equipment using such circulators, in order to miniaturize the equipment, it is often the case that the circulator, mixer, amplifier, and other components are housed together in a single case to form a so-called microwave composite circuit.

FIG. 2 shows a plan view of an example of a microwave composite circuit in which a microstripline circulator and a mixer are assembled in the same case with the cover removed. In the figure,
4, 5, and 6 are input/output connectors, 7 is a case, 8 is a microstrip line circulator, 9 is a mixer board, and 10 is a radio wave absorber. This radio wave absorber 10 is for preventing waveguide mode resonance from occurring in the case in the circulator housing portion, and is attached to the side wall of the case. Since the radio wave absorber contains a magnetic material such as iron, if it is placed in the magnetic circuit of the circulator, the characteristics of the circulator will change compared to when adjusting it alone. Therefore, the radio wave absorber must be placed as far away from the circulator as possible so as not to affect the circulator, resulting in a drawback that the shape of the case becomes larger.

FIG. 3 is a sectional view of another example of the microwave composite circuit. In the figure, the same reference numerals as in FIG. 2 indicate the same configurations. 10 is a radio wave absorber, and 11 is a case cover. In this example, the radio wave absorber is attached to the cover, but since the radio wave absorber needs to be placed as far away from the circulator as possible, there is a drawback that the height of the cover, that is, the height of the case becomes high.

Therefore, the purpose of the present invention is to prevent waveguide mode resonance from occurring in the case when incorporated into a microwave complex circuit, to reduce the size of the case of the microwave complex circuit, and to An object of the present invention is to provide a microstripline circulator equipped with a radio wave absorber whose characteristics can be adjusted.

In order to achieve the above object, a microstripline circulator according to the present invention has a microstrip pattern provided on one main surface of a ferrimagnetic substrate. A radio wave absorber is provided on the lip pattern surface via a dielectric material.

Hereinafter, the microstripline circulator according to the present invention will be described in more detail with reference to the drawings.

FIGS. 4a and 4b show a plan view and a side view of an embodiment of the microstrip line circulator according to the present invention. In the figure, 1 is a ferrimagnetic substrate such as a ferrite substrate, 2 is a magnet provided on the ground conductor surface 1B side of the substrate 1, and 3 is a magnetic field adjustment spacer provided between the substrate and the magnet. , 12 is a dielectric provided on the microstrip circuit surface 1A side of the substrate 1, and 13 is a radio wave absorber provided in contact with the dielectric.

The radio wave absorber 13 is made of a material containing a magnetic material such as iron, and prevents the resonance of the waveguide mode of the case that occurs in the circulator housing section.

In the circulator according to the present invention, when it is predicted that resonance due to the waveguide mode will occur in the case when a microwave composite circuit is configured, the radio wave It is possible to adjust the electrical characteristics to be optimal, including the influence that the absorber has on the magnetic circuit of the circulator.

When a radio wave absorber is provided through a dielectric in this way, the radio waves radiated from the surface of the microstrip circuit are absorbed, resulting in a slight increase in the passage loss of the circulator, but this passage loss is related to the thickness of the dielectric. However, the thinner the dielectric, the greater the passing loss.
For example, when using a 1 mm thick dielectric in a 4 GHz circulator, the increase in loss was 0.1 dB.

5a and 5b show a plan view and a side view of another embodiment of the microstripline circulator according to the present invention. In the figure, the same reference numerals as in FIG. 4 indicate the same configurations. 14 is a metal plate interposed between the dielectric 12 and the radio wave absorber 13. This metal plate 14 can improve the increase in passing loss, and no increase in passing loss was observed when a dielectric with a thickness of 1 mm was used.

FIGS. 6a and 6b show a plan view and a sectional view of a microwave complex circuit similar to that shown in FIG. 2, including a mixer, using a microstripline circulator according to the present invention. As is clear from the figure, since the radio wave absorber is integrated with the circulator, a special space for placing the radio wave absorber is not required, and the case can be made smaller.

Since the microstripline circulator of the present invention is configured as described above, even when it is incorporated as a microwave composite circuit, resonance of the waveguide mode does not occur in the case, and
Since there is no need to take up extra space for placing the radio wave absorber during installation, the case can be made smaller, and characteristics can be adjusted in advance before installation.

[Brief explanation of the drawing]

Figures 1a and b are a plan view and a side view of a conventional microstripline circulator, respectively, and Figure 2 is a plan view of an example of a microwave complex circuit device including a conventional circulator with the cover removed. , FIG. 3 is a sectional view of another example of a microwave composite circuit device including a conventional circulator, and FIGS. 5A and 5B are a plan view and a side view of another embodiment of the present invention, and FIGS. 6A and 6B are a plan view and a sectional view of a microwave composite circuit device including a circulator of the present invention. be. 1...Ferimagnetic substrate, 12...Dielectric material, 1
3...Radio wave absorber.

Claims (1)

[Scope of utility model registration request] A microstripline circulator in which a microstrip pattern is provided on one main surface of a ferrimagnetic substrate, characterized in that a radio wave absorber is provided on the surface of the microstrip pattern via a dielectric material. Microstrip line circulator.