A LTCC Filter Using Multilayered Stepped Impedance Resonators

Abstract

An X‐band filter with low insertion loss and high stop‐band rejection based on low temperature co‐fired ceramic technology is designed in this article. The filter is achieved using multilayered stepped‐impedance resonators structure. By converting microstrip lines of different layers to coplanar microstrip lines, the I/O ports are realized by the surface feed structure. Finite transmission zeros are distributed in the lower and upper stop‐bands to achieve a high stop‐band rejection. The measured results of the filter coincide well with the electromagnetic simulation results. The filter exhibits an insertion loss of lower than 1.2 dB from 9.4 to 10.1 GHz, and achieves 36 dB and 41.4 dB of attenuation at 7.8 and 11.7 GHz, respectively. The size of the filter is 5.0 × 4.5 × 1.96 mm3. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2003–2006, 2013

Miniaturized LTCC elliptic‐function lowpass filters with wide stopbands

“…The low temperature cofired ceramic (LTCC) is one of the technologies that provides component integration capabilities. LTCC offers layout flexibility and three‐dimensional (3D) integration capability to produce embedded passive components, for example, inductor, capacitors, filters, and antennas . The lowpass filter (LPF) is one of key passive components that are widely used in wireless systems to filter out unwanted signals.…”