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:
Jul. 04, 1995
Filed:
Oct. 20, 1992
Applicant:
Inventor:
Risto Huusko, Salo, FI;
Assignee:
Nokia Mobile Phones, Ltd., Salo, FI;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03H / ; H04B / ;
U.S. Cl.
CPC ...
455327 ; 455307 ; 455330 ; 455333 ; 333177 ; 333185 ; 333204 ;
Abstract
The invention relates to a frequency selective transformer circuit integrated on a multilayer printed board and operating at radio frequencies. To the input (1) of the transformer circuit there is coupled a resonant circuit realized by microstrip conductors (8, 9) operating as a two-pole filter. With the aid of the microstrip transformer according to the invention it is also possible to realize a mixer which attenuates the image frequency.