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:
Jun. 10, 1997
Filed:
Sep. 11, 1995
David Penunuri, Fountain Hills, AZ (US);
Thomas S Hickernell, Mesa, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A method and apparatus for a ladder filter (300, 400) incorporating same. The filter (100) includes a substrate and a first series resonator (100, 305, 403) disposed on the substrate and electrically coupled in series between the first electrical port (301, 401) and a first node. The first series resonator (100, 305, 403) includes a first series acoustic reflector (303), a first series gap (112), a first series transducer (105, 304, 403), a second series gap (112) and a second series acoustic reflector (115', 306) collectively disposed in an in-line configuration along a principal axis of the substrate. The filter (300, 400) also includes a first shunt resonator (100', 310, 404) disposed on the substrate and electrically coupled in shunt between the first node and ground. The first shunt transducer (105', 312, 404) and the first series transducer (105, 304, 403) have different periodicities not equal to periodicities of the first and second series acoustic reflectors (303, 306) and the first and second shunt acoustic reflectors (311, 313).