Design of lowpass filter using novel stepped impedance resonator

作者：Dehghani K^*; Karimi G; Lalbakhsh A; Maki S V

来源：Electronics Letters, 2014, 50(1): 37-38.

DOI：10.1049/el.2013.3144

• band-stop filters
• harmonics suppression
• low-pass filters
• microwave filters
• resonator filters
• transmission lines
• UHF filters
• ultra wideband technology
• lowpass filter design
• stepped impedance resonator
• ultrawide stopband
• sharp transition
• compact size
• circuit size reduction
• bended transmission line
• pendulum-shaped resonator
• harmonic suppression
• guided wavelength
• cut-off frequency
• frequency 1
• 30 GHz to 1
• 45 GHz
• frequency 1
• 45 GHz to 23
• 4 GHz

A new type of lowpass filter with an ultra-wide stopband, sharp transition and compact size is proposed. To reduce the circuit size, a bended transmission line is adopted in the stepped impedance resonators. To achieve a sharp roll-off, a pendulum-shaped resonator is implemented in the filter. The transition band is from 1.30 to 1.45 GHz with -3 and -20 dB, respectively. The stopband with an attenuation level better than 20 dB is from 1.45 up to 23.4 GHz, hence an ultra-wide stopband with 18th-harmonic suppression is achieved. Furthermore, the proposed filter exhibits an extremely small size of 0.09(g) x 0.11(g) where (g) is the guided wavelength at the cutoff frequency.

• 出版日期2014-1-2