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Design a Planar Band-Pass Filter in HairpinConfiguration Mohammad Ismail HossainMay 13, 2012 Design a Planar Band-Pass Filter in Hairpin Configuration Report Submitted By Mohammad Ismail Hossain Communications, Systems and ElectronicsSchool of Engineering and ScienceJacobs University
[email protected] 13, 2012Course: RF and Microwave Component and System Design (Lab). Course Instructor: Prof. Dr. Sören Peik 2 Abstract In this report, we address to design a planer band-pass filter in hairpin configuration.The scope of this project presented analyze, simulation, fabricate and measurementfor microwave hairpin filter design. As we know hairpin filter is one of the mostpopular microwave frequency filters because it is compact and does not requiregrounding. A combination of five pole hairpin resonators is designed to operate atcenter frequency of 2.40 GHz with a bandwidth of 200 MHz and 2.35 – 2.45 GHzfrequency band, respectively. This frequency is presenting for wireless LAN applica-tion and operates in the ISM band (Industrial, Scientific and Medical) application.In order to design hairpin filter several steps are considered that including by de-termining filter specification, order of filter, low pass filter prototype elements, lowpass to band-pass transformation, physical dimension (width, spacing, length) andwavelength guide. All simulations are performed by using “Advanced design Sys-tem (ADS)” software. The Rogers RO4003 substrate with dielectric constant 3.55and 32 mil of thickness is used to fabricate by using etching process. Improvementtechnique is introduced to get better response for scattering parameter. Finally, theresults from the implemented filter are analysed by using Network Vector Analyzer. Contents Abstract. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 Introduction3 1.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.2 Objectives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41.3 Prior to work. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41.4 Project Methodology. . . . . . . . . . . . . . . . . . . . . . . . . . . 41.4.1 Filter Specifications. . . . . . . . . . . . . . . . . . . . . . . . 6 2 Theoretical Background7 2.1 Background Study. . . . . . . . . . . . . . . . . . . . . . . . . . . . 72.2 Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72.2.1 Basic Filter Types. . . . . . . . . . . . . . . . . . . . . . . . 72.2.2 Applications of Filters. . . . . . . . . . . . . . . . . . . . . . 92.2.3 Classifications by Response Type. . . . . . . . . . . . . . . . 92.3 Microstrip Line. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112.3.1 Coupled Microstrip Lines. . . . . . . . . . . . . . . . . . . . . 132.4 Filter Prototype and Transformations. . . . . . . . . . . . . . . . . . 142.4.1 Low-Pass to Band-Pass Transformation. . . . . . . . . . . . . 14 3 Practical Procedures16 3.1 Scope of the work. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163.2 Design Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . 163.2.1 Low-pass prototype design with lumped elements. . . . . . . 163.2.2 Impedance and Frequency Transformations. . . . . . . . . . . 173.2.3 Low-Pass to Band-Pass Transformation. . . . . . . . . . . . . 193.2.4 Lumped to Coupled-Line Transformations. . . . . . . . . . . 203.2.5 Coupled-Line to Hairpin Configuration/ Planar Circuit Design233.2.6 Designed Layout. . . . . . . . . . . . . . . . . . . . . . . . . 24 4 Results255 Conclusion26 Bibliography. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272
