A Compact LTCC Dual-Band WLAN Filter using Two Notch Resonators

다국어 초록 (Multilingual Abstract)

This paper presents compact dual-band WLAN filter and filter module. They were developed by embedding all of the passive lumped elements into a LTCC substrate. In order to reduce the size/volume of the filter and avoid EM parasitic couplings between the passive elements, the proposed filter was designed using a 3rd order Chebyshev circuit topology and J-inverter transformation technology. The 3rd order Chebyshev bandpass filter was firstly designed for the bandselection of the 802.11b and was then transformed using finite transmission zeros technologies. Finally, the dual-band filter was realized by adding two notch resonators to the 802.11b filter circuit for the band-selection of the 802.11a/g. The maximum insertion losses in the lower and higher passbands were better than 2.0 and 1.3 dB with minimum return losses of 15 and 14 dB, respectively. Furthermore, the filter was integrated with a diplexer to clearly split the signals between 2 and 5 GHz. The maximum insertion and minimum return losses of the fabricated module were 2.2 and 14 dB at 2.4 - 2.5 GHz, and 1.6 and 19 dB at 5.15 - 5.85 GHz, respectively. The overall volume of the fabricated filter was 2.7 × 2.3 × 0.59 mm3.

목차 (Table of Contents)

• Abstract
• 1. Introduction
• 2. Design Theory
• 3. Fabrication
• 4. Experimental Results and Discussion
• 5. Conclusion
• Acknowledgements
• References

참고문헌 (Reference)

1 C. W. Tang., "Using the technology of low temperature co-fired ceramic to design the dualband bandpass filter" 16 (16): 407-409, 2006

2 Albert Sutono., "RF/Microwave Characterization of Multilayer Ceramic-Based MCM Technology" 22 (22): 326-331, 1999

3 E. E. Djoumessi., "Multilayer Dual-Mode Dual-Bandpass Filter" 19 (19): 21-23, 2009

4 J.S. Hong, "Microstrip filters for RF/Microwave applications" John Wiley Sons, Inc

5 C. F. Chen., "Microstrip diplexers design with common resonator sections for compact size but high isolation" 54 (54): 1945-1952, 2006

6 G. A. Lee., "Low-Cost Compact Spiral Inductor Resonator Filters for System-In-a-Package" 28 (28): 761-771, 2005

7 A. Bavisi., "Liquid Crystal Polymer-Based Planar Lumped Component Dual-Band Filters For Dual-Band WLAN Systems" 539-542, 2007

8 Jayaseelan, M., "Equivalent J-Inverter Network Parameters Analysis and Cancellation of Spurious Response of Parallel Coupled Microstrip Line" 247-252, 2006

9 L. C. Tsai., "Dual-band bandpass filters using equal-length coupled-serial-shunted lines and Z-transform technique" 52 (52): 1111-1117, 2004

10 Y. X. Guo., "Dual-Band Bandpass Filter in LTCC" 2005

11 C. W. Tang., "Design of a Dual-Band Bandpass Filter With Low-Temperature Co-Fired Ceramic Technology" 54 (54): 3327-3332, 2006

12 J. T. Juo., "Design of Microstrip Bandpass Filters With a Dual-Passband Response" 53 (53): 1331-1337, 2005

13 P. Mondal, "Design of Dual-Band Bandpass Filters Using Stub-Loaded Open-Loop Resonators" 56 (56): 150-155, 2008

14 M. H. Weng., "Compact and Low Loss Dual-Band Bandpass Filter Using Pseudo-Interdigital Stepped Impedance Resonators for WLANs" 17 (17): 187-189, 2007

15 S. Lee., "A planar dual-band filter based on reduced length parallel coupled lines" 20 (20): 16-18, 2010

16 J. S. Lim., "A modified Chebyshev bandpass filter with attenuation poles in the stopband" 45 : 898-904, 1997

17 Miyake. H., "A miniaturized monolithic dual band filter using ceramic lamination technique for dual mode portable telephones" 2 : 789-792, 1997

18 D. Puttadilok., "A microstrip diplexer filter using stepped-impedance resonators" 59-62, 2008

19 L. S. Wu., "A dual-band filter using stepped-impedance resonator(SIR)embedded into substrate integrated waveguide(SIW)" 1 (1): 1-4, 2010

20 Martin Fritz., "A Diplexer Based on Transmission Lines, Implemented in LTCC" 29 (29): 427-432, 2006