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hi all,
the attached file is a rfid tag antenna simulaton model,and including vary kind of setting for S11 and VSWR. but i don't know which is right, some setup way are offen used by designer,so pls help me and tell me why?thanks a lot!
thank you flanello, if you use the formula T=Zc-conj(Za)/Zc+Za to calculate the reflection coefficient ,then how to define VSWR,according to the theory,VSWR=(1+|T|)/(1-|T|),but the result of VSWR curve is very bad,on the side,the result of reflection coefficient curve seems also not good...
hi guys,
i have used HFSS for a long time,and i also designed and fabricated two or three RFID tag antenna for various applications.but now,i confuse about some setup about simulation,beacause i had seen many different viewpoint to this,but i believe some of them must be wrong or fallacious,i...
uhf rfid module
hi all,i have designed a module with impinj R1000,i used this chip on my fixed rfid reader and the read range is very good.but now,my handheld just read 1 meter with 3 dBi ceramic patch antenna, because of the physically bulky size of the circulator,i used a 20db coupler at the...
mhz power switch
FvM,thanks a lot! i verify control voltage is ok,according to the datasheet,max control voltage is 8.5V,i use 3.3v from GPIO of MCU,chip is also no problem,because i use the same switch chip that in 915Mhz transmitter,just change DC bloking capacitor from 68pF to...
13.56mhz rf switch
vfone,i looked over the datasheet that you commended,but the max power can't meet my need. my reader output 35dBm,i need to find out the reason of current board,why it is no normal connected switch module,but very good disconnect it,why each output of switch have enough...
13.56mhz power switch
hi,FvM,i used 0.1uF decoupling capacitor at the swtich output ports,is it bigger? the switch max input power is 38dBm,35 should be ok.
Added after 1 hours:
FvM,I tried to change decoupling capacitor from 4.7nF to 0.1uF,but the problem is still,and i found a strange...
13.56mhz switcher
hi,FvM,thanks for your reply,my antenna impandance is 50 ohm,and power level is 35dBm,it's ok used masw-007813 in 915mhz reader ,but in 13.56mhz reader is not good.miss matching?this frequency seem don't care strictly.
phemt switch macom
hi,all.i used a power switch at the front of 13.56M transmitter,but the effect is very bad,the switch module is macom masw-007813 and some voltage control circuit,datasheet claims operating range is DC-3G,i previously used it very well in 915M rfid reader,but now despair.in...
rfid long range reader problems
hi all,i'm trying to design a long range reader operating in 13.56Mhz ,and have a external PA,i'm sure that it's no problem for transmit link ,and the wave are all the same with the referrence document,but it can't read card at all,and i also change various...
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