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微波工程期中報告

微波工程期中報告. 論文 研討 : Microstrip Dual-band Dual-path Bandpass Filter Z. I. Khan 1, M. K. Mohd Salleh 2, M. A. Abdul Latip Faculty of Electrical Engineering Universiti Teknologi MARA (UiTM) 40450 Shah Alam, Malaysia Proceedings of the Asia-Pacific Microwave Conference 2011 報告人 :

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微波工程期中報告

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  1. 微波工程期中報告 論文研討: Microstrip Dual-band Dual-path Bandpass Filter Z. I. Khan 1, M. K. Mohd Salleh 2, M. A. Abdul Latip Faculty of Electrical Engineering Universiti Teknologi MARA (UiTM) 40450 Shah Alam, Malaysia Proceedings of the Asia-Pacific Microwave Conference 2011 報告人: 碩研電子一甲 MA130219 郭俊良 Southern Taiwan University Department of Electronic Engineering

  2. 摘要 • A dual-mode dual-band bandpass filter topologyis proposed by connecting two quarter-wavelength parallelcoupled-lines to two half-wavelength lines creating a dual-pathstructure. • Based on the topology, the characteristics of the filterresponse such as the bandwidth and the separation between thebands can be controlled by varying the even- and odd-modeimpedances of the coupled-lines and the line impedance of thehalf-wavelength lines. Using microstrip technology, the filter wasdesigned at 2.5 GHz using TRF45 (Taconic) and the results showthe filter is suitable in addressing medium band applications. • These concepts are validated through simulations andexperiments. • Index Terms — Dual-mode, dual-band, bandpass filter. Proceedings of the Asia-Pacific Microwave Conference 2011

  3. 簡介 • As wireless systems become more multifunctional, itincreases the importance of having multiband operations. • Dual-band filters appear thereby as one of the solutions tooptimize the size and cost of such multifunctional system. • The dual-band filters are located at the front ends of thewireless system enabling pre-selection of more than one band at the same time as well as rejection of interferers. • There arenumerous methods in producing a dual-band bandpass filter. • It can be observed that by directly cascading two individualfilters with two specified single pass-bands will produce the dual-band effect. • However, this approach needs large overall size. • Another method is by cascading a broadbandfilter with a band-stop structure which separates twopassband with central frequency and the bandwidth isarranged appropriately hence producing the dual-band effect. • This concept has a greater potential of having a compactsize filter. Proceedings of the Asia-Pacific Microwave Conference 2011

  4. 建議雙波段微帶濾波器 The proposed dual-band filter topology is depicted where two half-wavelength paths are connected to twoquarter-wavelength coupled lines. Frequency f0 found at the center of the twopassband responses, is the reference frequency at which thequarter-wavelength coupled lines and the half-wavelengthlines are defined. The frequencies f1 and f2 are the centerfrequencies of the first and the second pass-band. Eachbandpass response is of a second order, seen by their twopoles in the bands. As such, a very compact filter can bedesigned to produce a second order dual-band response. Atotal of three transmission zeros are found in the frequencyresponse of the filter that will assure a good level ofselectivity. Proceedings of the Asia-Pacific Microwave Conference 2011

  5. 建議雙波段微帶濾波器 • As the dual-band filter response is symmetrical about f0which can be arbitrarily chosen, any dual-band filter of anycenter frequency can be realized, theoretically, using thisconcept of topology. • The range of realizable coupling level ofthe coupled-lines will be the main factor that will limit such atopology in terms of the bandwidth and the passbandsseparation. • A working configuration of the impedances Zoe, Zoo and Zrwill exhibit a dual-band bandpass response that is shown inwhere the reference frequency of the transmission linelength is f0. • The frequency separation between the passbands,the passband bandwidth and the in-band ripple level of thepassband, can be varied by varying the impedances Zoe, Zooand Zr. However, the increase of bandwidth will be followedby increase in rejection levels as shown. • One example of working impedance configuration of thefilter elements is: Zoe = 100 , Zoo = 62 , and Zr = 43,which will result in a dual-band response centered atf1‘ = 1.77 GHz and f2’ = 2.96 GHz for a chosen referencefrequency of 2.5 GHz. The relative bandwidths for thepassbands are 29.7% and 17.6% respectively which isequivalent to 526 MHz. Proceedings of the Asia-Pacific Microwave Conference 2011

  6. 建議雙波段微帶濾波器 • The proposed topology is tested through the design ofmicrostrip dual-band bandpass filter on TRF45 whosecharacteristics are: dielectric constant, r = 4.5, substratesthickness, h = 1.6 mm and loss tangent, tan = 0.0035. • The complete layout of the dual-band microstrip filter withthe elements’ dimensions is shown. • As mentionedearlier, the bandwidth and the in-band ripple level of the passbands,can be varied by varying the impedance of each of thefilter elements (Zoe, Zoo and Zr), hence by adjusting thedimensions of the lines in the filter. Proceedings of the Asia-Pacific Microwave Conference 2011

  7. Proceedings of the Asia-Pacific Microwave Conference 2011

  8. 結論 • A compact topology of dual-mode dual-band microstripbandpass filter is proposed by using only two coupled –linesand two half-wavelength lines. • Only three control parametersare used in setting the desired characteristics of the filterresponse. • The proposed topology has been realized and testedusing microstrip technology and results have shown goodagreement between measurement and simulation. Proceedings of the Asia-Pacific Microwave Conference 2011

  9. 心得 感覺上無線系統變得更加多功能的，增加了波段與波行操作的重要性，雙波段濾波器從而出現這種多功能系統的雙頻段濾波器位於前端的預選擇多於一個頻帶的無線系統，使在相同的時間，以及拒絕干擾。有許多方法生產的雙帶通濾波器。可以觀察到，通過與兩個指定的單通頻帶直接級聯兩個單個的過濾器會產生雙頻效果。這個概念有一個更大的潛力，具有緊湊的尺寸過濾器。 Proceedings of the Asia-Pacific Microwave Conference 2011

  10. 參考文獻 • C.W. Tang, W.T. Liu, M. GG. Chen and Y.C. Lin, “Design ofDual-Band Bandpass Filterss with Short-end Coupled Line,” European Microwave Confereence, pp. 1385-1388, 2009. • K. Kim, H. S. Pyo, J. M. Ann, and Y. Lim, “Dual-band Filter using Half Wavelength Resonators and Dual-mode Resonators,” 978-1-4244-33888-9/09 IEEE, 2009. • Tsai, L.C, and Hsue, C.W, ““Dual-band Bandpass Filter using equal length coupled-series-sshunted lines and Z-transformtechnique”, IEEE Trans. Miccrow. Theory Tech., 2004, 52, (4), pp. 1111-1117. • C. Quendo, E. Rius, and C. PPerson, “An Original Topology ofDual-Band Filter with Trannsmission Zeros,” IEEE MTE-S Digest, WEID-7. 2003. • M. L. Chuang, “Concurrent ddual-band filter using single set of microstrip open-loop resonaators”, IEEE Electronics Letters, Vol. 41 , No. 18, September 2005. • S. Sun, and L. Zhu, “ Compa ct Dual-band Microstrip Bandpass Filter without External Feedss” IEEE Microwave and Wireless Components Letters, Vol. 15, No. 10, October 2005. • D. Ahn, J. -S. Kim, Y.-K. Sh in and K. -Y. Kang, “Design of 2pole Band Pass Filters using Closed Loop Resonator and Fig. 6. Simulated and measured results of the duual-band filter. Coupled Lines” , IEEE MT 1646, 1996. • [7] Z. I. Khan, M. K. Mohd Cascaded Rings Dual-band Conference, December 2010.

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