RF Circulator Circuit Symbol
The RF Circulator has its own circuit symbol to facilitate its representation on electronic circuit diagrams or schematics. The basic symbol consists of a circle and an arrow, indicating the direction of the power cycle. Usually, the ports are shown in clockwise order around the circle: port 1, port 2, and finally port 3.
If the component is done by counterclockwise, it is marked in counterclockwise order.
It is worth noting that each port, whether it is a coax feeder or a waveguide, is shown as a single wire rather than a pair of conductors.
One of the commonly used forms of RF circulators is formed by a Y-shaped section of a microstrip or strip-line transmission line on a printed circuit board or another dielectric. The ports are placed 120° apart so they are equally spaced around a circle.
Y shape strip-line RF circulator PCB layout
The PCB assembly is then sandwiched between two pieces of ferrite, and on the outside of it, two strong magnets are held in place. This component creates a strong magnetic field axially through the ferrite disk, which concentrates the magnetic field around the Y-junction, called Biasing.
The cross-section of the RF Circulator structure
When a signal is applied to one of the ports, an electromagnetic field is generated in the strip line, which interacts with the magnetic field from the magnet, and there is a complex interaction between them. This causes the signal to only travel around the circulator to the next port. The circulator assembly consisting of a Y junction and a ferrite has a distinct resonant frequency, equivalent to forming a resonator.
In various radio frequency circuit design applications, the circulator has a wide range of applications that benefit from its much lower insertion loss, that is, the attenuation is much lower. Usually, they tend to be used at microwave frequencies, so they are often called microwave circulators.
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1.8
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2.5
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5
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35×25×20
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服务
可定制射频隔离器/环行器(10M-40GHz),双工器/三工器(30MHz/850MHz-20GHz),滤波器(DC-20GHz),功分器,同轴负载,同轴衰减器等射频器件;可定制频率覆盖DC~110GHz,功率最高20KW。
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整体外形尺寸小至0.6*0.3*0.3mm (DFN0603),工作电压范围覆盖2.5V~36V,电容值低至0.2pF,浪涌能力最高可达240安培,静电等级可达空气放电、接触放电±30KV。提供免费浪涌测试仪、静电测试仪测试。
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