TY - JOUR
T1 - Ultra-wideband ladder filter using SH0 plate wave in thin LiNbO3 plate and its application to tunable filter
AU - Kadota, Michio
AU - Tanaka, Shuji
N1 - Funding Information:
I should like to thank the co-authors of this volume for much collaborative help, and the many authors whose work is reported here for keeping us informed. This review was written during the tenure of a Science Research Council Advanced Fellowship, and earlier work was financially supported by Unilever and New Zealand Postgraduate Scholarship and a Research Fellowship from Trinity Hall, Cambridge.
Publisher Copyright:
© 2014 IEEE.
PY - 2015/5/1
Y1 - 2015/5/1
N2 - A cognitive radio terminal using vacant frequency bands of digital TV (DTV) channels, i.e., TV white space, strongly requires a compact tunable filter covering a wide frequency range of the DTV band (470 to 710 MHz in Japan). In this study, a T-type ladder filter using ultra-wideband shear horizontal mode plate wave resonators was fabricated, and a low peak insertion loss of 0.8 dB and an ultra-large 6 dB bandwidth of 240 MHz (41%) were measured in the DTV band. In addition, bandpass filters with different center frequencies of 502 and 653 MHz at 6 dB attenuation were numerically synthesized based on the same T-type ladder filter in conjunction with band rejection filters with different frequencies. The results suggest that the combination of the wideband T-type ladder filter and the band rejection filters connected with variable capacitors enables a tunable filter with large tunability of frequency and bandwidth as well as large rejection at the adjacent channels of an available TV white space.
AB - A cognitive radio terminal using vacant frequency bands of digital TV (DTV) channels, i.e., TV white space, strongly requires a compact tunable filter covering a wide frequency range of the DTV band (470 to 710 MHz in Japan). In this study, a T-type ladder filter using ultra-wideband shear horizontal mode plate wave resonators was fabricated, and a low peak insertion loss of 0.8 dB and an ultra-large 6 dB bandwidth of 240 MHz (41%) were measured in the DTV band. In addition, bandpass filters with different center frequencies of 502 and 653 MHz at 6 dB attenuation were numerically synthesized based on the same T-type ladder filter in conjunction with band rejection filters with different frequencies. The results suggest that the combination of the wideband T-type ladder filter and the band rejection filters connected with variable capacitors enables a tunable filter with large tunability of frequency and bandwidth as well as large rejection at the adjacent channels of an available TV white space.
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U2 - 10.1109/TUFFC.2014.006845
DO - 10.1109/TUFFC.2014.006845
M3 - Article
AN - SCOPUS:84929297822
VL - 62
SP - 939
EP - 946
JO - Transactions of the IRE Professional Group on Ultrasonic Engineering
JF - Transactions of the IRE Professional Group on Ultrasonic Engineering
SN - 0885-3010
IS - 5
M1 - 7103533
ER -