A small loop antenna is a type of antenna that is circular in shape and typically has a diameter of less than one-tenth of a wavelength. It is also known as a magnetic loop antenna or a loop antenna. It is commonly used for radio communication and broadcasting.
A small loop antenna works by creating a magnetic field when an alternating current (AC) flows through it. This magnetic field then induces an electric field, which produces an electromagnetic wave that can be transmitted or received.
A dipole small loop antenna consists of two parallel wires, while a monopole small loop antenna has only one wire. The dipole antenna has a balanced feed, meaning that the two wires carry equal and opposite currents, while the monopole antenna has an unbalanced feed with only one wire carrying current.
Small loop antennas have several advantages, including a compact size, high efficiency, and low noise. They are also less affected by surrounding objects and can be easily tuned to a specific frequency. Additionally, they have a highly directional radiation pattern, making them useful for point-to-point communication.
No, small loop antennas have a limited frequency range due to their physical size. They are most effective for frequencies below 30 MHz, making them ideal for shortwave, AM, and amateur radio bands. However, larger versions of small loop antennas, known as large loop antennas, can be used for higher frequencies.