Patent ID: 8810337
Filing Date: 2014-08-19
Classification: H01P

Abstract:
1. A microwave filter, comprising: a plurality of vertical microstrip elements placed parallel to one another, said plurality of vertical microstrip elements having upper ends and lower ends; at least one horizontal microstrip element connecting each of said plurality of vertical microstrip elements to one another; and at least one spurline formed in at least one of said at least one horizontal microstrip element; wherein said filter microwave passes a passband of frequencies defined by said plurality of vertical microstrip elements, connection points of said at least one horizontal microstrip element, a signal input point of said filter and a signal exit point of said microwave filter, said plurality of vertical microstrip elements suppressing frequencies above and below said passband to define said passband between said frequencies suppressed by said plurality of vertical microstrip elements, and said microwave filter blocks third harmonic frequencies of said passband, said third harmonic frequencies of said passband being blocked only by said at least one spurline formed in at least one of said at least one horizontal microstrip.