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BB4112 参数 Datasheet PDF下载

BB4112图片预览
型号: BB4112
PDF下载: 下载PDF文件 查看货源
内容描述: [4 Port Circulator, 424MHz Min, 428MHz Max]
分类和应用: 射频微波
文件页数/大小: 58 页 / 1041 K
品牌: TEMEX [ TEMEX ]
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FERRITE DEVICES  
Technical information /Technology  
TECHNICAL INFORMATION  
TECHNOLOGY  
Y-J u n c t io n c irc u la t o r  
PORT 1  
PORT 2  
The Y-junction circulator uses spinel ferrites or garnet ferrites  
in the presence of a magnetic bias field, to provide a non-reciprocal  
effect. A 3-port circulator (shown in figure 1) is the basic model,  
which can be used to explain how it operates.  
If a signal is applied at port # 1, it will emerge from port # 2 with a loss  
characteristic called “insertion loss. Typical values of insertion loss:  
0.1 to 0.5 dB.  
PORT 3  
In the reverse direction, there will be leakage at port # 3 from  
the incoming signal at port # 1.This leakage called isolation is typically  
20 dB below incoming power at port # 1.  
FIG. 1  
Due to the “3rd order symmetry” of theY-junction, the behavior is the same for the other ports, with  
respect to port # 1 to port # 2, port # 2 to port # 3 and port # 3 to port # 1.The circulator's role is to pass  
energy, for instance, in the RF-head of a radar, assuring high isolation between the high power  
transmitter and the sensitive low power receiver (figure 2).  
TheY-junction exists in three main technologies:  
Coaxial devices: these feature triplate technology with coaxial connectors.  
Drop-in circulators: in triplate or microstrip technology.  
Waveguide devices: it consist of three waveguides forming an H-plane junction in either a "T"  
or a "Y"-symmetrical structure.  
When very high power is needed, the technology uses a four-port differential phase shift duplexer.  
ANTENNA  
MISMATCH  
POWER  
SOURCE  
LOAD  
~
RECEIVER  
TRANSMITTER  
ISOLATOR  
CIRCULATOR  
FIG. 2  
FIG. 3  
15-3  
Vol. 1  
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