Dual-channel balise consists of four coil antennas--27.095 MHz tele-powering receiving antenna, 4.23 MHz FSK uplink transmission antenna, 9.032 MHz PSK uplink transmission antenna and programming antenna. The dominant interaction between two closely-packed antennas is the mutual coupling. It causes difficulty in mass production. Mutual coupling introduces the impedance alteration. The tuning frequency is deviated from the operation frequency so that the antenna could not transmit the maximum power. If the deviated tuning frequency exceeds the antenna bandwidth, it cannot work normally. When the sensitive antenna receives in-band higher harmonic wave introduced by source antenna, it induces voltage which is unexpected interference. This paper analyzes the mutual coupling coefficient of multi-antenna. Some mutual coupling coefficient is more than −10 dB. In order to reduce the mutual coupling, a low-pass filter is proposed for 4.23MHz antenna and 9.032MHz antenna. The low pass filter decreases the higher harmonic wave interference. The simulation results indicate that the filter declines the coupling coefficient between two close antennas, which is less than −10 dB. It increases the antenna isolation and independence.
Interaction analysis and optimization of multi-antenna in dual-channel balise
01.11.2016
557294 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch