NOVEL MICROSTRIP FILTER STRUCTURE
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2001-Oct-23
Conventional microstrip bandpass filters need large open areas over their resonators to avoid detuning effects and to maintain their inter-resonator coupling factors. They typically exhibit only modest stop band and attentuation characteristics. Furthermore, they are tuned by irreversably removing portions of the metallization or by expensive high Q trim capacitors: processes which are both slow and costly. Typically, filters for different parts of a system cannot share a common small substrate due to stray coupling effects.