Design of 2.4/5.2 GHz Dual-Band Bandpass Filter using Stub-Loaded Microstrip Line Resonator

• Main Authors: Lio Lee, 李相興
• Other Authors: S. L. Kao
• Format: Others
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/77556323950340439939

碩士 === 長庚大學 === 電子工程學系 === 99 === In recent years, the global communications market booming, a large number of microwave circuit technology has been applied in a wide range of communications systems. The composition of the basic elements of microwave circuits is RF amplifiers, filters, mixers and oscillators, and the filter. The role includes noise filtering, harmonic interference suppression, surge absorbers, power clean, and electromagnetic interference protection signal separation. In mobile phones, satellite communications, wireless LAN and other wireless communication products, communication products involved for receiving or transmitting signals, so the product shall be added to the filter design to ensure signal quality. In this thesis, we will cover the wireless LAN band (2.4 GHz and 5.2 GHz) dual-band bandpass filter. The architecture of the filter is included Stub-Loaded and SIRs. The Stub-Loaded can be tuned the bandwidth of filter and the SIRs can be adjustable the main frequency of filter. Finally, we used the input structure to increase the zero of filter for improvement the characteristics. The filter has insertion loss (S21) of -3dB and reflection loss (S11)of -17dB using FR4 substrate with 33 mm  30 mm chip size.