Широкополосное согласование укороченных антенн

Matching circuit based on the Chebyshev bandpass filter and L-shaped matching circuit are compared in order to provide broadband matching of the shorted antennas with the feeder. A method for matching antennas is proposed using a two-link Chebyshev bandpass filter, the elements of a serial loop of which are either a capacitive component of the resistance of radiation of a shortened dipole antenna or an inductive component of a magnetic antenna. The calculation of matching circuits has been carried out for a shortened dipol antenna and a magnetic antenna. The graphs of AFC and S₁₁ depending on the frequency are represented. The calculation of active and reactive components of the input impedance of antennas was carried out with using the two-link Chebyshev bandpass filter and the L-shaped circuit for output resistance of the filter matching to the 50-ohm line. The graphs, based on the calculations performed, of the dependence of the antenna bandwidth on the degree of shortening for a shortened symmetrical dipole antenna and for a magnetic antenna are represented. Calculations of the matching circuits with using the Chebyshev bandpass filter were carried out and comparison with the L-shaped circuit was made. Conclusions: - matching of the shortened dipol antenna, with the degree of shortening η = 2, using Chebyshev two-link bandpass filter allows to increase antenna bandwith as much as 2,5 times as compared to matching using of the L-shaped matching circuit; - matching of the magnetic antenna, with the degree of shortening η = 2, using Chebyshev two-link bandpass filter allows to increase antenna bandwith as much as 3 times as compared to matching using of the L-shaped matching circuit.