1. 1 Design of UWB Bandpass Filter Using Triangular ring MMR With Stub – Loaded Resonator Yung-Wei Chen Department of Computer and Communication, Kun Shan University, Taiwan

2. Outline Motivation Design procedure of the filter Results Conclusion 2

3. Motivation 3 IEEE 802.11a

4. Motivation – Paper review (1) L. Zhu et al. proposed the UWB filter used a multiple-mode resonator (MMR) with tight coupling I/O lines to generate a wideband response. S. W. Wong et al. proposed the ultra-wideband bandpass filters using short-/open-stubs embedded ring resonator. The square ring resonator is first excited by two interdigital coupled-lines at two sides to achieve a triple-mode ultra-wideband bandpass filter performance L. Zhu, S. Sun, and W. Menzel, “Ultra-wideband (UWB) bandpass filters using multiple-mode resonator,” IEEE Microw. Wireless Compon. Lett., vol. 15, no. 11, pp. 796–798, Nov. 2005. S. W. Wong, L. Zhu, L. C. Quek and Z. N. Chen, “A stopband-enhanced UWB bandpass filter using shout-/open- stubs embedded ring resonator,” in Proc. IEEE Asia-Pacific Microw. Conf., Dec. 2009, pp. 913-916.

5. 5 Motivation – Paper review (2) Q. X. Chu et al. proposed Novel compact ultra-wideband (UWB) bandpass filter (BPF) using stub-loaded multiple-mode resonator (MMR) is presented in this letter. Q. X. Chu, X. H. Wu and X. k. Tain, “Novel UWB Bandpass Filter Using Stub-Loaded Multiple-Mode Resonator,” IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS., vol. 21, NO.8, Aug 2011.

6. 6 Motivation – UWB bandpass filter using Triangular ring MMR Duroid 6010 substrate with a relative dielectric constant of 10.2, a loss tangent of 0.0023 and a thickness of 1.27 mm is used for the simulation and practical fabrication. Lower transmission zero Upper transmission zero There are two directions of this study : 1. To design UWB filter using Triangular ring MMR with coupling lines; 2. Triangular ring MMR add to the SLR composed of two transmission zeros

7. Change of transmission zeros (1) The fig shows (a) (b) change θ 4 + θ 6 to watch S 21 and Y 21 of the lower transmission zeros (c) (d) change θ 5 to watch S 21 and Y 21 of the upper transmission zeros (a)(b) (c) (d) Change θ of SLR

8. 8 (a)(b) (c)(d) Change of transmission zeros (2) The fig shows (a) (b) change Z 1 to watch S 21 and Y 21 of the lower transmission zeros (c) (d) change Z 2 to watch S 21 and Y 21 of the upper transmission zeros Change impedance of SLR

9. 9 Measured results of the filter The measured results of the filter have a 3 dB FBW of 117% The SLR(stub-loaded resonator) is designed with two transmission zeros at 2.8 and 11GHz

10. 10 Passband (GHz)3.1-10.6 2.9-11.63.1-10.6 Substrate height (mm) / ε r (PCB) 0.81/ 3.38 (PCB) 1.27 / 10.6 (PCB) 0.787 / 2.2 (PCB) 1.27 / 10.2 Return loss (dB)18142020(max) Insertion loss (dB)<0.5<0.2<0.5 3-dB FBW (%)109 122111 Circuit Size (mm 2 ) (λ g ×λ g ) 251 (0.77×0.54) 175 (1.64×0.59) 594 (0.96×0.78) 128.2 (1.11×0.62) Comparisons with other proposed UWB filters P-K. Singh, S. Basu, and Y-H. Wang, “ Planar Ultra-Wideband Bandpass Filter Using Edge Coupled Microstrip Lines and Stepped Impedance Open Stub, ” IEEE Microw. Wireless Compon. Lett., vol. 17, no. 9, pp. 649 – 651, Sep. 2007. C-P. Chen, Z. Ma, N. Nagaoka, and T. Anada, “ Novel Compact Ultra-Wideband Bandpass Filter Employing Short-circuited Stubs with Coupled Stepped-Impedance Resonator, ” Proceedings of Asia-Pacific Microwave Conference 2007., R. Ghatak, P. Sarkar, R.k. Mishra, and D.R. Poddaer “ A Compact UWB Bandpass Filter With Embedded SIR as Band Notch Structure, ” I EEE Microw. Wireless Compon. Lett., vol. 21, no. 5, pp. 261 – 263, MAY. 2011

11. 11 Thanks for your attention !!