Coplanar waveguide type microwave ferrite circulator, preparation method and design method

A technology of coplanar waveguide and design method, used in waveguide-type devices, instruments, radio wave measurement systems, etc., can solve the problems of device preparation process difficulties, manufacturing process difficulties, complex packaging structures, etc., to achieve excellent data results and reduce transmission. Loss, the effect of simplifying the preparation process

Pending Publication Date: 2021-06-11
HUBEI NORMAL UNIV
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Problems solved by technology

But this structure will make the manufacturing process more difficult compared with the circulator using pure coplanar microwave guide structure, because for the coplanar microwave guide circulator with unconnected ground plane, it needs to be in two different planes Preparation of metal electrode layer
[0009] Through the above analysis, the existing problems and defects of the existing technology are: microwave devices are constantly developing towards integration and miniaturization, while the existing Y-shaped coplanar microwave guide circulator structure is difficult to prepare, and the packaging structure is complicated. And the transmission loss is large, the performance is not good
[0010] The difficulty in solving the above problems and defects is: to realize a ferrite circulator with a coplanar waveguide structure, it is necessary to add a metal electrode layer as a non-connected ground plane on the traditional coplanar waveguide structure. craft creates difficulties

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  • Coplanar waveguide type microwave ferrite circulator, preparation method and design method
  • Coplanar waveguide type microwave ferrite circulator, preparation method and design method
  • Coplanar waveguide type microwave ferrite circulator, preparation method and design method

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preparation example Construction

[0067] Such as Figure 4 As shown, the preparation method of the coplanar waveguide microwave ferrite circulator provided by the embodiment of the present invention includes the following steps:

[0068] S101, preparing a center electrode layer and a ground electrode layer of a coplanar microwave guide on a silicon substrate;

[0069] S102, place a cylindrical ferrite ceramic sheet on the central conductor, prepare a metal conductive layer on the upper surface of the ferrite ceramic sheet, and use the metal conductive layer on the surface of the ferrite as a non-connected ground plane to obtain a common Surface waveguide microwave ferrite circulator.

Embodiment 1

[0072] According to the network theory of the circulator, the Y-junction circulator can be described by a three-port network. S parameters are used to define the port characteristics of the circulator, and the S parameters defined by the scattering matrix are as follows:

[0073]

[0074] in P here i and P i ' are the input and output power of the i-th port, respectively. Assuming the return loss (S11), isolation loss (S31) and insertion loss (S21) in reference port 1, the corresponding parameters are the same for port 2 and port 3.

[0075] An ideal circulator satisfies the conditions of losslessness and impedance matching at the same time.

[0076] The lossless condition states that:

[0077] S * S=1 (2)

[0078] where S * is the complex conjugate of S.

[0079] The matching condition means that there is no impedance mismatch at the port, that is:

[0080] S 11 = S 22 = S 33 =0 (3)

[0081] According to (2) and (3), the ideal circulator needs to meet the fo...

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Abstract

The invention belongs to the technical field of circulators, and discloses a coplanar waveguide type microwave ferrite circulator, a preparation method and a design method. A central electrode layer and a grounding electrode layer of a coplanar waveguide are arranged on a silicon substrate; a ferrite material is arranged above the central electrode layer; a conducting layer is attached to the surface of the ferrite material; the ferrite circulator is hexagonal; the three non-adjacent edges of the ferrite circulator are respectively provided with a port, the three ports form a Y-shaped junction, and the included angle of the Y-shaped junction is 120 degrees. The invention discloses a novel ferrite circulator structure which replaces an original non-connection grounding plane layer, a conducting layer on the surface of ferrite serves as a non-connection grounding plane, and distribution of an electromagnetic field in a device can meet theoretical requirements of a circulator. According to the ferrite circulator, the transmission loss of the circulator can be reduced, meanwhile, the preparation is easier, the preparation cost of the circulator can be reduced, and the ferrite circulator is more beneficial to commercial application.

Description

technical field [0001] The invention belongs to the technical field of circulators, and in particular relates to a coplanar waveguide microwave ferrite circulator, a preparation method and a design method. Background technique [0002] At present, a ferrite circulator is a microwave passive device that realizes unidirectional signal transmission. It is generally three-port or four-port. The transmission of electromagnetic waves circulates in one direction, and the opposite direction is isolated. [0003] The Y-junction microwave circulator is a three-port device. If the microwave signal is input from port 1, it will be output from port 2 and will not be transmitted to port 3; if it is input from port 2, it will be input from port 3 and will not be transmitted to 1 port. The signal transmission will be passed sequentially in clockwise or counterclockwise direction and not reversed. The main function of the microwave ferrite circulator is to serve as a shared device connecti...

Claims

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Application Information

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IPC IPC(8): H01P1/383H01P11/00G01S7/02
CPCG01S7/02H01P1/383H01P11/00
Inventor 盛苏徐玉姣陈含笑温建
Owner HUBEI NORMAL UNIV
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