Broadband indoor active loop antenna. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Broadband indoor active loop antenna. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Antennas. Measurements, adjustment, coordination

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The proposed broadband indoor active loop antenna increases the reception efficiency of radio stations of all KB bands (3-30 MHz) by about 3-5 times compared to a telescopic one.

Due to the fact that loop antennas are sensitive to the magnetic component of the electromagnetic field, electrical interference generated by various household appliances is significantly weakened.

Broadband indoor active loop antenna

The frame itself consists of 2-4 turns of insulated wire (the diameter does not matter) laid in the window frame (the author has 82x133 cm, 3 turns).

The differential amplifier (T1, T2) has a gain of 10 dB up to 30 MHz, and the T3 buffer allows you to connect the output of the device to the input of the receiver not only directly, but also through a 75-ohm cable of any length.

Author: S. van Ruji

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