long88
Member level 3
Hi everyone, i am going to design a log periodic dipole or loop antenna.
Frequency range is from 800-1000 Mhz for UHF RFID applications. Currently, i am facing some problem. I am using CST to simulate the antenna
1) I am quite confuse on calculate the impedance of the loop or dipole array? Anyone can advise or share me with some useful documents?
2) There are two type feeding for log periodic array.either crisscross or parallel straight wire feed. How to calculate the characteristic impedance of the feeder line?
3) I wanna to design a planar log periodic dipole and loop on FR-4PCB. Can anyone tell me what is the effect of the substrate on the length of antennas?
I attach the 3d structure of my design at bottom.
THank you
Frequency range is from 800-1000 Mhz for UHF RFID applications. Currently, i am facing some problem. I am using CST to simulate the antenna
1) I am quite confuse on calculate the impedance of the loop or dipole array? Anyone can advise or share me with some useful documents?
2) There are two type feeding for log periodic array.either crisscross or parallel straight wire feed. How to calculate the characteristic impedance of the feeder line?
3) I wanna to design a planar log periodic dipole and loop on FR-4PCB. Can anyone tell me what is the effect of the substrate on the length of antennas?
I attach the 3d structure of my design at bottom.
THank you