发明名称 |
A laminated antenna duplexer and a dielectric filter. |
摘要 |
A dielectric antenna duplexer used in a high frequency radio device such as a portable telephone, and a dielectric filter for forming the duplexer of the SIR (stepped impedance resonator) composed by cascade connection of first transmission lines having one end grounded and second transmission lines having one end open and lower in characteristic impedance than in the first transmission lines, first transmission lines and second transmission lines are individually coupled in electromagnetic field, thereby forming an antenna duplexer and a dielectric filter of small insertion loss, high bandwidth selectivity, excellent band pass characteristic, and low cost. <IMAGE> |
申请公布号 |
EP0641035(A3) |
申请公布日期 |
1996.04.03 |
申请号 |
EP19940113131 |
申请日期 |
1994.08.23 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
ISHIZAKI, TOSHIO;SASAKI, ATSUSHI;SATOH, YUKI;KUSHITANI, HIROSHI;NAKAKUBO, HIDEAKI;NAKAMURA, TOSHIAKI;AIZAWA, KIMIO;FUJINO, TAKASHI |
分类号 |
H01P1/203;H01P1/205;H01P1/213 |
主分类号 |
H01P1/203 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|