Coupled-Line Coupler with Impedance Transforming Characteristic

• Main Authors: Wang, Wen-Ping, 王文萍
• Other Authors: Chang, Chi-Yang
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/33k6zw

碩士 === 國立交通大學 === 電信工程研究所 === 106 === In this thesis, coupled-line coupler with impedance transforming characteristics is proposed using quarter-wavelength transformer and coupled-line coupler. It is a planar circuit consisted of microstrip lines and coupled line with enhanced coupling structures, which makes it simple to manufacture and reliable. In order to generalize the concept with broadband impedance transforming characteristics, two coupled-line couplers with different constructure are designed and measured. The proposed coupled-line couplers, with center frequency 1.5GHz,input impedance 50 Ohm and output impedance 20 Ohm, are manufactured on a Rogers RO4003 substrate with dielectric constant of 3.55 and thickness of 20 mil. On the other hand, this thesis also emphasizes on overcoming the problem of measuring the circuit with input and fixture that cause the reflection and phase shift.