FIELD: radio engineering.
SUBSTANCE: antenna device for roof of automobile and antenna amplifier containing the selection diagram of AM frequency, amplification diagram of AM signal, selection diagram of FM frequency, amplification diagram of FM signal and feed circuit; at that, antenna amplifier is also equipped with rejection filter one end of which is connected to earthing contact of antenna amplifier and the other end is connected to metal mounting base for antenna on automobile roof. Antenna device includes antenna housing in the form of shark fin, metal mounting base, support of antenna and radio receiving antenna; antenna housing is installed on metal mounting base so that space for arrangement of antenna support, radio receiving antenna and circuit board with antenna amplifier can be formed.
EFFECT: increasing electric earthing potential of antenna amplifier, which is located on printed circuit board, increasing the height of location of antenna amplifier relative to metal mounting base, reducing absorption of high-frequency signals of automobile roofs and improving amplifier receiving characteristics.
24 cl, 8 dwg
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