Design and Implementation Dual-band Coupler for GSM/ISM Amplifier Application

• Main Authors: Wen-yi Lee, 李文毅
• Other Authors: Shry-Sann Liao
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/08326549097765662801

碩士 === 逢甲大學 === 資訊電機工程碩士在職專班 === 96 === This thesis presents two kinds of miniature technology to reduce the size of traditional type dual-band branch-line coupler and to match one or more amplifier with its coupler characteristic to complete the dual band balance amplifier design and implementation for GSM/ISM application. Firstly SIR structure will reduce the area of traditional type dual-band branch line form 100% to 49%.Secondly T-shape and SIR structures the area of traditional type dual-band branch line will reduce to 28%. Especially , T-shape and SIR structure not only have the effect of compact-size but also be able to satisfied system specifications ,which band-width can reached 100MHz(∠S21 -∠S31 within 90°±1°). The frequency of these two compact-size branch-line couplers are designed at 0.9GHz & 2.4 GHz and fabricated on a FR-4 copper clad laminate ( ; =0.022 ; thickness=0.8mm ; metal thickness=0.02mm). Finally, the measurements result area reduction, single planar and one time implementation. Additionally, without lumped component, bonding- wires and via-holes the waste of manufacture will be reduce. In the end , a balance amplifier by using the miniaturized coupler to reach the dual band property, and research in the miniaturized circuit and balance amplifier applications.