The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 20, 2003
Filed:
Feb. 01, 2001
Applicant:
Inventor:
Tatsuya Tsujiguchi, Nagaokakyo, JP;
Assignee:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01P 1/203 ; H01P 1/20 ;
U.S. Cl.
CPC ...
H01P 1/203 ; H01P 1/20 ;
Abstract
A coplanar resonator comprising first center electrodes each having open ends and a ground electrode which extends along either side thereof is formed on the upper plane of a dielectric substrate, and second center electrodes and a perimeter electrode are formed on the lower plane of the dielectric substrate, so as to face the above center electrodes and ground electrode. A filter, duplexer, and communication device using this resonator are provided, thereby reducing the size of the resonator part formed of electrode patterns on a dielectric substrate, facilitating reduction in size of the overall device, and increasing no-load Q.