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Wideband microstrip isolator

A broadband, isolator technology, applied in the field of non-reciprocal microwave devices, can solve the problems of inability to meet microwave integration, difficult to achieve impedance matching, difficult to control impedance matching, etc., to facilitate microwave integration, solve impedance matching, impedance matching good effect

Inactive Publication Date: 2009-10-07
江苏灿勤科技股份有限公司
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Problems solved by technology

[0003] In the prior art, on the one hand, a stripline isolator structure is adopted: a 0.2-0.5mm circuit is sandwiched tightly between two ferrite substrates, and a bias permanent magnet and a number of compensation plates are added to the upper and lower sides, and placed In the aluminum cavity and magnetic shielding, although it can meet the requirements of broadband
[0004] On the other hand, microstrip isolators are often composed of ferrite substrates, ceramic sheets, compensation sheets, and permanent magnet sheets in sequence; when this microstrip isolator works in a wide frequency band, the reflection between stages is strong, and the impedance matching Difficult to control, difficult to achieve better impedance matching, resulting in a bandwidth generally around 10%, limiting its application in broadband systems

Method used

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Examples

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Embodiment

[0025] Example: attached figure 1 ~ attached Figure 4 ,

[0026] A broadband microstrip isolator, consisting of a first permanent magnet sheet 3, a second permanent magnet sheet 9, a first compensation sheet 4, a second compensation sheet 8, a ceramic sheet 5, a ferrite substrate 6, and a support base plate 7.

[0027] See attached figure 1 and attached figure 2 As shown, the ferrite substrate 6 is made of polycrystalline spun ferrite material, the upper surface of the ferrite substrate 6 is printed with a "Y"-shaped coupling matching circuit 13, and the back of the ferrite substrate 6 is coated with a metal layer. The lower surface of the ferrite substrate 6 is mounted with a support base plate 7, which is bonded with the support base plate 7 through a prepared conductive glue to ensure good microwave grounding. The ceramic sheet 5, the first compensation sheet 4 and the first permanent magnet sheet 3 are stacked, and the ceramic sheet 5, the first compensation sheet 4...

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Abstract

The invention relates to a wideband microstrip isolator, which comprehensively considers the effects of electromagnetic parameters of a ferrite substrate, central working frequency and a bias field, and provides a best parameter combination. The microstrip isolator effectively solves the resistance matching problem, has the advantages of small volume, light weight, capable of being plastered, etc., realizes the wideband of the microstrip isolator and can be widely applied to the field of microwave communication field.

Description

technical field [0001] The invention relates to a microstrip isolator and belongs to the field of non-reciprocal microwave devices. Background technique [0002] Microstrip isolator is a passive device with microwave unidirectional transmission characteristics, and is widely used in various passive and active microwave circuit modules, extensions, and complete machines. The microstrip isolator plays the role of inter-stage isolation, interference prevention, impedance matching, and inter-stage decoupling in the system. For example, adding a microstrip isolator at the front end of the amplifier chain module can reduce the noise of the power amplifier module; in the middle of the amplifier chain module Add a microstrip isolator for matching to prevent self-excitation of the power amplifier module; add a microstrip isolator at the end of the power amplifier to prevent the power amplifier module from burning; add a microstrip isolator to the oscillator to reduce the frequency pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/36
Inventor 许江
Owner 江苏灿勤科技股份有限公司
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