![]() During transmission, the smaller loop would induce a high-frequency AC current into the larger loop that in turn would radiate the RF signal. Both small and large loops are magnetically coupled and form a transformer. This smaller loop is connected to the transceiver via an impedance-matched feed line. A smaller loop is positioned towards the opposite end of the capacitor within the area of the main larger loop. The magnetic loop consists of a conductive loop that is separated at one end by a capacitor, thus forming an LC circuit that has to resonate at the operating frequency of the antenna. When receiving, the oscillating magnetic field of the incoming radio wave induces a current in the loop by Faraday’s law of induction. The magnetic loop couples to the to the magnetic field of the radio wave in the region near the antenna, in contrast to a monopole or a dipole which couple to the electric field of the wave. A magnetic loop is essentially a small loop antenna whose circumference is less than 1/10 of the wavelength.
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