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:
Aug. 15, 1995
Filed:
Dec. 27, 1993
Applicant:
Inventors:
Ronald D Fuller, Mesa, AZ (US);
Hugh R Malone, Phoenix, AZ (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01P / ;
U.S. Cl.
CPC ...
333204 ; 333246 ;
Abstract
Microwave parallel coupled line filters with direct taps having improved rejection of undesired signals near the pass-band are disclosed. Improved rejection is achieved by controlling the transmission zeros created by the input and output direct taps. Performance is comparable to parallel coupled line filters having substantially more coupling sections. The method involves shifting the transmission zeros by changing the position of the direct taps along the resonator or changing the impedance of the open-circuited stub associated with each tap. Impedance transformers can be used to match back to the source and load impedances.