A compact open-loop resonator filter with a wide stopband response |
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Authors: | Jaruek Prayoot |
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Affiliation: | aDepartment of Electrical Engineering, Faculty of Engineering, King Mongkut's Institute of Technology, North Bangkok, Pibulsongkram Rd., Bangsue, Bangkok 10800, Thailand |
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Abstract: | This paper presents a new class of microstrip slow-wave open-loop resonator filter with reduced size and improved stopband characteristics. A comprehensive treatment of both resonator ends loaded with triangular and rectangular shapes is described, leading to the invention of a microstrip slow-wave open-loop resonator. A four-resonator bandpass filter is designed at the operating frequency about 2 GHz, bandwidth of 60 MHz. The size of the slow-wave open-loop resonator is optimized from the standpoint of the unloaded Q-factor. The proposed filter is not only compact size due to the slow-wave effect but also has a wider upper stopband resulting from the dispersion effect. The filter design of this type will be described in detail. The experimental results are demonstrated and discussed. |
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Keywords: | Reduced size Open-loop resonator Microstrip filter |
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