Design and Study of Wideband Harmonic-Suppression and Miniature Wilkinson Power Divider

• Main Authors: Chen , Jia-Wei, 陳佳緯
• Other Authors: Chih-Chiang Chen
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/45662706699492593413

碩士 === 逢甲大學 === 電機工程學系 === 104 === The aim of this dissertation is to investigate and study in the method designing for Wilkinson power divider (WPD) of microwave passive circuit miniaturization and harmonic suppression. By utilizing the design with extended lines, open stubs and open double-transmission-line stub (ODTLS) structure, combining with complementary-conducting-strip (CCS) transmission line (TL), and using printed circuit board (PCB) manufacturing process to achieve wideband harmonic suppression and WPD miniaturization. In the PCB manufacturing process, because the width of low-impedance open stub line is wider and has difficulties in achieving compact layout, the method in this thesis was suggested to be designed to replace open stubs with ODTLS. By doing parameters analyses of ODTLS, this method is designed to use CCS transmission line instead of the ideal transmission line circuit model which is conformed to Electrical specifications, and then to be performed simulation, implemented, measured and verified. This study utilizes three-dimensional (3-D) electromagnetic (EM) full-wave (FW) finite element method (FEM) to simulate and analyze, and uses the PCB manufacturing process from JetPCB Co. to make the prototype of this WPD, and measure it by vector network analyzer.. From the measurement results, input return loss (|S11|) at center frequency of proposed WPD is 39.29 dB, the insertion losses (|S21|, |S31|) are 3.1 dB and 3.3 dB, output return losses (|S22|, |S33|) and isolation (|S23|) are 20.9 dB, 20.3 dB and 19.8 dB, respectively. When input return loss is better than 20 dB, output return losses and isolation are better than 15 dB, the bandwidth is 0.86 – 1.13 GHz, which achieve 27.1% of fractional bandwidth. In this band, insertion losses (|S21|, |S31|) are 3.15 ± 0.05 dB and 3.28 ± 0.06 dB, respectively, phase difference (∠S21-∠S31) is 2.62 ± 0.85º . On the condition of 20-dB harmonic suppression level, the harmonic suppression bandwidth of insertion losses (|S21|, |S31|) are 2.29 GHz (1.88 - 4.17 GHz) and 2.68 GHz (1.81 – 4.49 GHz), respectively. It shows satisfying performance of wideband harmonic suppression in 2f0 - 4f0 band. Compared with conventional ring microstrip WPD ("π"×〖("17 mm" )〗^"2" ≅907.92 mm2 at 1-GHz), the occupying area of proposed CCS WPD (I/O PADs excluded) is 261.63 mm2 (15.3 mm × 17.1 mm). Therefore, it achieved 71.18% of the area reduction factor (ARF), and it indicates that the method is effective in miniaturizing.