| 摘要 |
PCT No. PCT/GB97/01100 Sec. 371 Date Oct. 9, 1998 Sec. 102(e) Date Oct. 9, 1998 PCT Filed Apr. 22, 1997 PCT Pub. No. WO97/40506 PCT Pub. Date Oct. 30, 1997A variable capacitor includes a first electrode (2), a second electrode (3) and, located between the first and second electrodes, an array of gas discharge tubes (7). The capacitor includes means for producing an electrical discharge in the tubes, thereby affecting the capacitance of the capacitor. |
