Simple wire antena impedance
时间：04-10
整理：3721RD
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Dear friends!
I am not so good in RF and so on. May be my question is quite stupid.
So, i am designing active AM antena circuit, and got question about antena impedance and about the way how to model amplifier(basicly how to model antenna connection to amplifier). Desired antena is 20cm long wire. Must work in both FM and AM bands. As i understand i will have different impedances in FM and in AM bands.
Can sombody help me with this impedances and modeling?
BR, CAT
I am not so good in RF and so on. May be my question is quite stupid.
So, i am designing active AM antena circuit, and got question about antena impedance and about the way how to model amplifier(basicly how to model antenna connection to amplifier). Desired antena is 20cm long wire. Must work in both FM and AM bands. As i understand i will have different impedances in FM and in AM bands.
Can sombody help me with this impedances and modeling?
BR, CAT
Hi
if i'm true - the FM is ~100 MHz and AM is ~1MHz....
20 cm wire is capacitance ~2pF +~mOhms resistors at 1MHz and ~Ohms resistors at 100MHz
Your need high impedance input amplifier to get voltage from such antenna at 1MHz and You can use 50 Ohm input at 100MHz