| 摘要 |
PURPOSE:To obtain an excellent filter characteristic by forming an opening to one long side of a metallic case provided with a resonance dielectric substance and providing a radio wave absorbing body therein in a packing way so as to suppress spurious radiation. CONSTITUTION:The resonance dielectric bodies 12-1-12-3 are all arranged while being biased toward one long side from a center line alpha prolonged in the lengthwise direction of a case main body 14. Furthermore, input/output electromagnetic field coupling rods 13-1, 13-2 are arranged opposite to the arranging sides of the dielectric substances 12-1-12-3. A strip notched opening 28 is formed over the entire long side at the inside of the case 21 at the long side of the lower surface opposite to the arranging side of the dielectric substances 12-1-12-3. The strip radio wave absorbing body 29 is packed to the opening 28. Through the forming above, spurious radiation is suppressed and then an excellent filter characteristic is obtained. |
