Highly Miniaturized and Performed UWB Bandpass Filter Embedded into PCB with SrTiO3 Composite Layer

Title & Authors
Highly Miniaturized and Performed UWB Bandpass Filter Embedded into PCB with SrTiO3 Composite Layer
Cheon, Seong-Jong; Park, Jun-Hwan; Park, Jae-Yeong;

Abstract
In this paper, a highly miniaturized and performed UWB bandpass filter has been newly designed and implemented by embedding all the passive elements into a multi-layered PCB substrate with high dielectric $\small{SrTiO_3}$ composite film for 3.1 - 4.75 GHz compact UWB system applications. The high dielectric composite film was utilized to increase the capacitance densities and quality factors of capacitors embedded into the PCB. In order to reduce the size of the filter and avoid parasitic EM coupling between the embedded filter circuit elements, it was designed by using a $\small{3^{rd}}$ order Chebyshev circuit topology and a capacitive coupled transformation technology. Independent transmission zeros were also applied for improving the attenuation of the filter at the desired stopbands. The measured insertion and return losses in the passband were better than 1.68 and 12 dB, with a minimum value of 0.78 dB. The transmission zeros of the measured response were occurred at 2.2 and 5.15 GHz resulting in excellent suppressions of 31 and 20 dB at WLAN bands of 2.4 and 5.15 GHz, respectively. The size of the fabricated bandpass filter was $\small{2.9{\times}2.8{\times}0.55(H)mm^3}$.
Keywords
Bandpass filters;Embedded passive devices (EPDs);Independent transmission zeros;Jinverter;Multi-layered PCB substrate;High dielectric composite;Ultra wideband (UWB);
Language
English
Cited by
References
1.
B. S. Kwon, S. S. Myoung, et al, "Co-planar waveguide filter with ground perforation for ultrawideband system," Proceedings of Asia-Pacific Microwave Conference, vol. 3, pp. 1-4, Dec. 2005.

2.
Sheng Sun, Lei Zhu, et al, "A Compact Wideband Bandpass Filter Using Transversal Resonator and Asymmetrical Interdigital Coupled Lines," IEEE Microwave and Wireless Components Letters, vol. 18, no. 3, 99. 173-175, Mar. 2008.

3.
L. K. Yeung and Ke-Li. Wu; "A compact Second- Order LTCC Bandpass Filter with Two Finite Transmission Zeros," IEEE Transactions on Microwave Theory and Techniques, vol. 51, pp. 337- 341, Feb. 2003.

4.
C-W. Tang, C-C. Tseng, et al, "Development of Ultrawideband LTCC Filter," IEEE International Conference on UWB, pp. 320-322, Sep. 2005.

5.
C-F. Chang and S-J. Chung, "Bandpass Filter of Serial Configuration with Two Finite Transmission Zeros using LTCC Technology," IEEE Transactions on Microwave Theory and Techniques, vol. 53, pp. 2383-2388, Jul. 2005.

6.
C-W. Tang, T-C. Lin, C-Y. Chang, "Realization of Transmission Zeros in Combline Filters using an Auxiliary Inductively Coupled Ground Plane," IEEE Transactions on Microwave Theory and Techniques, vol. 51, pp. 2112-2118, Oct. 2003.

7.
C. H. Chen and K. H. Lin, "Novel compact LTCC UWB bandpass filter with simple semi-lumped circuit model," International Conference on Microwave and Millimeter wave Technologies, vol. 1, pp. 21-24, Apr. 2008.

8.
J. C. Park and J. Y. Park, "Wideband LC Balun transformer using Coupled LC Resonators Embedded into Organic Substrate," Microelectronics Journal, vol. 40, pp. 1555-1560, Nov. 2009.

9.
H-H Lee and J-Y Park, "Characterization of Fully Embedded RF Inductors in Organic SOP Technology," IEEE Transactions on Advanced Packaging, vol. 32, No. 2, pp. 491-496, May 2009.

10.
R. R. Tummala and M. Swaminathan, Introduction to System-On-Package (SOP) Miniaturization of the Entire System, Chap. 7 SOP Substrate with Multilayer Wiring and Thin-Film Embedded Components, McGraw-Hill, New York, 2008.

11.
J. S. Hong and M. J. Lancaster, Microstrip Filters for RF/Microwave Applications, Chap. 3 Basic Concepts and theories of Filters, John Wiley&Sons, New York, 2001.

12.
G. Brzezina, L. Roy, L. MacEachern, "A miniature LTCC bandpass filter using novel resonators for GPS applications," Proceedings of European Microwave Conference, pp. 536- 539, Oct. 2007.

13.
J. S. Lim and D. C. Park, "A modified Chebyshev bandpass filter with attenuation poles in the stopband," IEEE Transactions on Microwave Theory and Techniques, vol. 45, pp. 898-904, Jun. 1997.

14.
G. S. Yun and S. J. Kim, "Method of Fabricating an Embedded Capacitor in Printed Circuit Board," Korea patent, 10-2008-0007502, 2008.