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Lu, Yunlong; Wang, Yi; Liu, Taijun; Yu, Bo; Li, Kai (2017)
Publisher: Cambridge University Press
Languages: English
Types: Article
Subjects: TA
A miniaturized substrate-integrated coaxial line (SICL) bandpass filter with improved upper stopband using asymmetrical spiral stub-loaded resonators is presented in this paper. Owing to the space-filling feature of the spiral structure, the size of the proposed filter is significantly reduced. A theoretical analysis is carried out to examine the resonance property of the proposed resonator. It is found that the frequency ratios of the second and third harmonics to the fundamental frequency can be extended to 2.86 and 4.4. Benefiting from the circuit structure and SICL technology, the designed filter has a small size, wide stopband, low crosstalk, and high-density integration ability. The measured results show that the proposed filter, with dimensions of 0.051λ0 × 0.044λ0, operates at 1.056 GHz and the 20-dB rejection band is extended to 3.94f0.
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    • [8] Chien, H.-Y.; Shen, T.-M.; Huang, T.-Y.; Wang, W.-H.; Wu, R.-B.: Miniaturized bandpass filters with double-folded substrate integrated waveguide resonators in LTCC. IEEE Trans. Microw. Theory Tech., 57 (7) (2009), 1774-1782.
    • [9] Chu, P.; Hong, W.; Wu, K.; Chen, J.; Tang, H.: A miniaturized bandpass filter implemented with substrate integrated coaxial line. Microw. Opt. Technol. Lett., 55 (2013), 131-133.
    • [10] Zhang, Y.; Song, Z.: A compact substrate integrated coaxial line bandpass filter with extended rejection bandwidth. Microw. Opt. Technol. Lett., 56 (2014), 415-418.
    • [11] Chu, P. et al.: Wide stopband bandpass filter implemented with spur stepped impedance resonator and substrate integrated coaxial line technology. IEEE Microw. Wireless Compon. Lett., 24 (4) (2014), 218-220.
    • [12] Ma, K.X.; Ma, J.G.; Yeo, K.S.; Do, M.A.: A compact size coupling controllable filter with separate electric and magnetic coupling paths. IEEE Trans. Microw. Theory Tech, 54 (3) (2006), 1113-1119.
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