Premium
A 1.0 to 1.58‐GHz tunable bandpass filter with switchable single‐/dual‐band responses
Author(s) -
Cho YoungHo,
Yun SangWon,
Park Cheolsoo
Publication year - 2020
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32473
Subject(s) - passband , band pass filter , center frequency , varicap , multi band device , physics , materials science , optoelectronics , electrical engineering , electronic engineering , optics , engineering , capacitance , antenna (radio) , electrode , quantum mechanics
A tunable bandpass filter with switchable single‐/dual‐band responses is presented. The single‐band to dual‐band transformation is achieved by controlling frequencies of poles in a passband. The frequencies of poles are adjusting by using a coupled structure with two coupling capacitors. A filter with both 4‐pole single‐band and 2‐pole dual‐band characteristics is built on a Duroid substrate with ε r = 3.0 and h = 30 mils. The tuning of the center frequency and the passband transformation are done using silicon varactor diodes. In the 4‐pole single‐passband mode, a center frequency tuning of 1.0 to 1.4 GHz is achieved with 1‐dB bandwidths of 150 to 198 MHz. The 2‐pole dual‐band bandpass filter mode has the center frequency tuning of 1.0 to 1.29 GHz (low‐band) and 1.4 to 1.58 GHz (high‐band). The application areas are in wideband cognitive radios.