Ultra-Low-Loss Millimeter-Wave LTCC Bandpass Filters Based on Flexible Design of Lumped and Distributed Circuits

The design of ultra-low-loss millimeter-wave (mm-wave) low-temperature cofired ceramic (LTCC) bandpass filters is proposed by merging the lumped and distributed circuits in this breif. By inserting a ground plane inside the filter, the cross talk between quasi-lumped capacitors and distributed microstrip lines can be highly reduced. Accordingly, the lumped or distributed circuits can be analyzed and designed flexibly for further performance improvements. To alleviate the design complexity, a lossy equivalent circuit model is introduced and verified for the proposed LTCC bandpass filter. Based on the equivalent circuit, the techniques for enhanced stopband rejection and low insertion loss can be both obtained. For experimental verification, two 27 GHz LTCC bandpass filters are designed, fabricated, and measured. Very low insertion losses of only 0.73 dB and 0.84 dB, wide stopband, and multiple transmission zeroes are realized, indicating the proposed LTCC filters good candidates for 5G system-in-package applications.

[1]  Li Gao,et al.  Microwave and Millimeter-Wave LTCC Filters Using Discriminating Coupling for Mode Suppression , 2016, IEEE Transactions on Components, Packaging and Manufacturing Technology.

[2]  Jin-Xu Xu,et al.  Compact High-Isolation LTCC Diplexer Using Common Stub-Loaded Resonator With Controllable Frequencies and Bandwidths , 2017, IEEE Transactions on Microwave Theory and Techniques.

[3]  Ming Zhou,et al.  Miniaturized W-Band Gap Waveguide Bandpass Filter Using the MEMS Technique for Both Waveguide and Surface Mounted Packaging , 2019, IEEE Transactions on Circuits and Systems II: Express Briefs.

[4]  Q. Chu,et al.  U-Shape Slots Structure on Substrate Integrated Waveguide for 40-GHz Bandpass Filter Using LTCC Technology , 2015, IEEE Transactions on Components, Packaging and Manufacturing Technology.

[5]  Michael J. Lancaster,et al.  University of Birmingham W-Band Waveguide Bandpass Filters Fabricated by Micro Laser Sintering , 2018 .

[6]  W. Che,et al.  LTCC Multilayered Substrate-Integrated Waveguide Filter With Enhanced Frequency Selectivity for System-in-Package Applications , 2014, IEEE Transactions on Components, Packaging and Manufacturing Technology.

[7]  Venkata Narayana Rao Vanukuru,et al.  CMOS Millimeter-Wave Ultra-Wideband Bandpass Filter With Three Reflection-Zeros Using Compact Single TFMS Coupled-Line Hairpin Unit , 2020, IEEE Transactions on Circuits and Systems II: Express Briefs.

[8]  A. Kouki,et al.  Design of Compact Dual-Band LTCC Second-Order Chebyshev Bandpass Filters Using a Direct Synthesis Approach , 2019, IEEE Transactions on Microwave Theory and Techniques.

[9]  A. Kouki,et al.  Vertical LTCC Integrated Rectangular Waveguide and Transitions for Millimeter-Wave Applications , 2019, IEEE Transactions on Microwave Theory and Techniques.

[10]  Jian‐Xin Chen,et al.  Millimetre-wave low-temperature co-fired ceramic bandpass filter with independently controllable dual passbands , 2017 .

[11]  Wanchun Tang,et al.  Quad-Mode LTCC Surface Mounted Packaging Common-Mode Filter Based on the Asymmetric Short-Stub Loaded Resonator , 2020, IEEE Transactions on Circuits and Systems II: Express Briefs.

[12]  Byung-Wook Min,et al.  Compact mm-Wave Bandpass Filters Using Silicon Integrated Passive Device Technology , 2019, IEEE Microwave and Wireless Components Letters.

[13]  E. Pistono,et al.  High-Performance Shielded Coplanar Waveguides for the Design of CMOS 60-GHz Bandpass Filters , 2012, IEEE Transactions on Electron Devices.

[14]  E. Dutkiewicz,et al.  Design of a Miniaturized On-Chip Bandpass Filter Using Edge-Coupled Resonators for Millimeter-Wave Applications , 2017, IEEE Transactions on Electron Devices.