| Summary: | 碩士 === 中原大學 === 電子工程研究所 === 99 === In this thesis, we design a planar UWB filter then fabricate it on a Roger4003 substrate which is 20mm × 13.03mm. The filter consists of interdigital-coupled line and step-impedance resonators. The interdigital-coupled line provides the passband of UWB filter and the step-impedance resonators perform a pair of transmission zeros on two sides of passband so that the edge may be sharper than used to be. Besides, we have an additional device on the step-impedance resonators to suppress the spurious mode. The measurement result show that the passband is between 3.07 ~ 9.95 GHz, return loss is better than 17.9 dB, insertion loss is less than 0.6 dB, and suppression on upper stopband above 15.2 dB until 15 GHz
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