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AN555 View Datasheet(PDF) - Silicon Laboratories

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AN555 Datasheet PDF : 38 Pages
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AN555
8. Whip Antenna for SW Receiver
SW reception usually uses whip antennas, the same as FM.
8.1. SW Whip Antenna Design
A whip antenna is a monopole antenna with a stiff but flexible wire mounted vertically with one end adjacent to the
ground plane.
There are various types of whip antennas, including long non-telescopic metal whip antennas, telescopic metal
whip antennas, and rubber whip antennas. Figure 22 shows the telescopic whip antenna.
Figure 22. Telescopic Whip Antenna for SW
8.2. SW Whip Antenna Schematic
Figure 23. SW Whip Antenna Schematic
Q1 2SC9018 is a low noise RF transistor and it constitutes a LNA to amplify the SW signal coming from the whip
antenna.
C30 (33nF) is the ac couplijng cap between whip antenna and LNA input.
C33 (0.47uF) is the ac coupling cap going to the AMI pin.
R31, R41 are bias resistors of the transistor.
36
Rev. 0.2
 

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