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need help ! design for 80MHZ -120MHZ antenna

时间:04-10 整理:3721RD 点击:
item :
frequency : 80MHz to 120MHz
length :≤ 200mm
diameter : any
shape : slender stick

In this long the only way is a wire antenna.
As it is with a big broadband this may be a good design.
With a 1.2mm wire made on a 9 mm support 12 turns first turn 34 mm from the connect point the spacing between the two firt turns is 2mm increasi it 1 mm at each turn and in the last one 67 mm of wire.
The impedance is between 34 and 67 ohm at this frequency range.
Is as little as I can design it.
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pls, give a detail drawing to me , format is picture or DWG and so on . I understand the word difficultly !

thank you !

If you need to cover whole range between 80 and 120MHz, go for log-periodic (dipole) antenna or LPDA. Mind you, it will not be so small.

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