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C-band isolator for liquid helium and liquid helium temperature region, and application of isolator

An isolator, C-band technology, used in waveguide-type devices, electrical components, circuits, etc.

Inactive Publication Date: 2013-05-15
ZIJINSHAN ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, domestic research on low-temperature isolators is still blank, so the development of low-temperature broadband isolators has become an urgent problem to be solved in the field of low-noise receivers

Method used

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  • C-band isolator for liquid helium and liquid helium temperature region, and application of isolator
  • C-band isolator for liquid helium and liquid helium temperature region, and application of isolator
  • C-band isolator for liquid helium and liquid helium temperature region, and application of isolator

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Embodiment 1

[0030] According to C. E. Fay and R. L. Comstock circulator design theory, based on YAlIG-6A electromagnetic parameter 4πM at low temperature 4K s =980Gauss, , design a low-temperature belt line Y-junction circulator, the internal structure is as follows image 3 As mentioned above, Y-junction stripline 1 has a central conductor circle diameter of 8mm, ferrite 2 has a diameter of 14mm and a thickness of 0.85mm, port 3 is connected to a 50-ohm load to form a low-temperature isolator, and 4 is the aluminum base of the low-temperature isolator . Select the temperature of 4K, 50K and 90K to measure the isolation effect of the isolator, and the results are shown in Figure 4-Figure 6 , the results show that the temperature range of low temperature is 4K~90K, and the working frequency is 5.35GHz~6.65GHz. Requirements, the specific indicators are as follows:

[0031] Frequency range 5.35GHz~6.65GHz;

[0032] Forward input loss 0.3~0.5dB;

[0033] Reverse isolation 18dB~30dB; ...

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Abstract

The invention provides a C-band isolator for liquid helium and liquid helium temperature regions. The C-band isolator comprises ferrite which is made from YA1IG-6A, wherein the content of Al2O3 is 5.24%; when the material is 300K, the saturation magnetization intensity 4piMs is equal to 590 Gauss; and when the material is 4K, the saturation magnetization intensity 4piMs is equal to 980 Gauss. The C-band isolator makes up the blank of the research of a low temperature isolator in China, provides a key device for a front-end system of a low noise radar receiver of radio astronomy and the like, has the relative operating bandwidth of more than 21% at the low temperature of 4K-90K, is high in isolation degree and low in insertion loss, and can meet the demand on a low temperature isolator of a superconducting receiver system.

Description

technical field [0001] The invention belongs to the field of wireless communication, specifically a C-band isolator based on low-temperature ferrite technology in the non-reciprocal liquid helium and liquid nitrogen temperature zones and its front-end of low-noise receiver, satellite communication and superconducting radar receiver applications in the system. Background technique [0002] A microwave isolator is a passive device that realizes unidirectional transmission. It is widely used in radar receivers and wireless communication fields, and is a key device in the receiver front-end system. In order to reduce thermal noise, radio astronomy receivers need to work in a low-temperature environment from below the liquid nitrogen temperature zone to the liquid helium temperature zone. However, the characteristics of room temperature isolators deteriorate seriously at low temperatures. Offset, the bandwidth is getting narrower and narrower, and even completely loses the isola...

Claims

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Application Information

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IPC IPC(8): H01P1/36H01P1/383
Inventor 刘洁单文磊谢道伟
Owner ZIJINSHAN ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
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