Design and Characterization of Bandpass Filter with Multiple Zeros on Glass Interposer for 6G Applications

This paper presents design, fabrication and measurement of bandpass filter on glass interposer. The filter applies separated electric and magnetic coupling paths (SEMCP) and source-load coupling techniques to achieve four transmission zeros (TZs), with two located at the lower band and two located at the upper band. Generated TZs are tuneable by changing electric and magnetic coupling strengths. The filter is fabricated utilizing Semi-additive Patterning (SAP) process. Measurement shows the filter has 6.5% fractional bandwidth centered at 140 GHz with insertion loss of 1.19 dB.