| 摘要 |
PURPOSE:To arbitrarily set the pass band characteristics without deteriorating the sensitivity, by providing a plurality of tuning coils for the reception of electromagnetic waves of the same frequency for one ferrite core. CONSTITUTION:A rod shape ferrite core 10 is provided with tuning coils 11,11' and matching coils 12,12' magnetically coupled with the tuning coils 11 and 11'. A tuning signal respectively obtained from the matching coils 12 and 12' is inputted to an amplifying element 14 via impedance elements 13 and 13'. The pass band width can be adjusted in the stagger system by slightly shifting the tuning frequency of the tuning coils 11 and 11'. |
