A Fully Embedded LTCC Multilayer BPF for 3-D Integration of 40-GHz Radio

• Published in: IEEE transactions on advanced packaging Vol. 30; no. 3; pp. 521 - 525
• Main Authors: Yun Hee Cho, Dong Yun Jung, Young Chul Lee, Lee, J.W., Myung Sun Song, Eun-Soo Nam, Sukhoon Kang, Chul Soon Park
• Format: Journal Article
• Language: English
• Published: Piscataway, NY IEEE 01.08.2007; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Band pass filters; Bandpass filter (BPF); Ceramics; Circuit properties; Coplanar waveguides; Design. Technologies. Operation analysis. Testing; Electric, optical and optoelectronic circuits; Electronic circuits; Electronic equipment and fabrication. Passive components, printed wiring boards, connectics; Electronics; embedded; Exact sciences and technology; Frequency filters; Frequency measurement; Integrated circuits; Local oscillators; Loss measurement; low-temperature cofired ceramics (LTCC); multilayer; Multilayers; Multimedia; Multimedia systems; multimedia wireless systems (MWS); Noise levels; Nonhomogeneous media; Oscillators; Oscillators, resonators, synthetizers; Radio; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Stripline; Three dimensional; Waveguide transitions; Strip line transitions; Multimedia systems; Return loss; Strip line discontinuities; Strip line; low-temperature cofired ceramics (LTCC); Multiple layer; Bandpass filter (BPF); Local oscillator; multilayer; Transmission line; Three dimensional structure; Multilayer filter; Integrated circuit; Insertion loss; Tapered waveguide section; Band pass filter; Coplanar waveguides; Ceramic materials; embedded; Multilayered circuit; multimedia wireless systems (MWS)
• ISSN: 1521-3323; 1557-9980
• DOI: 10.1109/TADVP.2007.898587

This paper demonstrates a low loss fully embedded multilayer bandpass filter (BPF) using low-temperature cofired ceramic (LTCC) technology for 3-D integration of 40-GHz multimedia wireless system (MWS) radio. The LTCC filter implemented in a stripline configuration occupies an area of only 5.5 times 2.3 times 0.6 mm including shielding structure and coplanar waveguide (CPW) transitions. The measured insertion loss was as small as 1.9 dB at a center frequency of 41.8 GHz, and the return loss was 12.2 dB including the loss associated with two CPW-to-stripline transitions. This six-layer BPF showed 3-dB bandwidth of 10.5% from 39.6 to 44.0 GHz at a center frequency of 41.8 GHz and suppressed the local oscillator (LO) signal to 20.2 dB at a local oscillator frequency of 38.8 GHz, making it suitable for the 40 GHz MWS applications.