FREQUENCY-STABILIZING CIRCUIT, ANTENNA APPARATUS AND COMMUNICATION TERMINAL DEVICE

摘要

A frequency-stabilizing circuit (25) comprises four coiled conductors (L1 to L4). The first coiled conductor (L1) and the second coiled conductor (L2) are connected in series to constitute a first series circuit. The third coiled conductor (L3) and the fourth coiled conductor (L4) are connected in series to constitute a second series circuit. The first series circuit is connected between an antenna port and a feeding port, and the second series circuit is connected to between the antenna port and a ground. The first coiled conductor (L1) and the second coiled conductor (L2) are wound to constitute a first closed magnetic path (loop shown by a magnetic flux (FP12)), and the third coiled conductor (L3) and the fourth coiled conductor (L4) are wound to constitute a second closed magnetic path (loop shown by a magnetic flux FP34).