Balanced antenna system

摘要

The invention relates to a balanced antenna system comprising a radiator connected via a matching circuit to a balun. In certain embodiments, the radiator comprises a first radiating element and a second radiating element and the matching circuit comprises a first impedance-matching circuit connected to the first radiating element and a second impedance-matching circuit connected to the second radiating element. The first and second matching circuits may be identical and are connected through the balun to a single port. To minimize the component count, the design of the matching circuit and balun is co-optimized.

主权项

1. A balanced antenna system comprising a radiator connected to an integrated matching circuit and balun, wherein
i) the radiator comprises a first radiating element and a second radiating element each having a respective feed line; (ii) the matching circuit comprises a first impedance-matching circuit having an input and an output and a second impedance-matching circuit having an input and an output; (iii) the balun comprises first and second inputs for input of first and second balanced signals, circuitry to convert the first and second balanced signals to a single unbalanced signal, and a single output for output of the unbalanced signal; (iv) the feed line of the first radiating element is connected to the input of the first impedance-matching circuit and the feed line of the second radiating element is connected to the input of the second impedance-matching circuit; (v) the output of the first impedance-matching circuit is connected to the first input of the balun and the output of the second impedance-matching circuit is connected to the second input of the balun; and (vi) the first and second impedance-matching circuits and the balun are integrated and produce a phase difference of substantially 180° (degrees) between the feed lines of the first and second radiating elements across an operating bandwidth of the antenna system.