| 摘要 |
<p>The invention relates to a band-pass filter including at least a first oscillating circuit comprising inductive means (L<SUB>1</SUB>, L<SUB>2</SUB>) in parallel with capacitive means (C<SUB>ij</SUB>), and a second oscillating circuit comprising inductive means (L<SUB>3</SUB>, L<SUB>4</SUB>) arranged in parallel with the capacitive means (C<SUB>ij</SUB>), the first oscillating circuit being coupled to the second oscillating circuit, characterised in that the capacitive means (C<SUB>ij1</SUB>) of the first oscillating circuit include a set of variable capacitive members (C<SUB>11</SUB>, C<SUB>12</SUB>, C<SUB>13</SUB>, C<SUB>14</SUB>) arranged in series and with a fixed capacity (C<SUB>1</SUB>), in that the capacitive members of the second oscillating circuit include a set of variable capacitive members (C<SUB>21</SUB>, C<SUB>22</SUB>, C<SUB>23</SUB>, C<SUB>24</SUB>) arranged in series and with a fixed capacity (C<SUB>2</SUB>), in that the first oscillating circuit and the second oscillating circuit are coupled through capacitive members having essentially fixed values (C<SUB>3</SUB>, C<SUB>4</SUB>), and in that the capacitive coupling members are connected to a middle point (P1, P2) of two variable capacitive members.</p> |
