TY - CHAP
T1 - SAW-based bandpass filters with flat in-band group delay and enhanced fractional bandwidth
AU - Psychogiou, Dimitra
AU - Gomez-Garcia, Roberto
AU - Peroulis, Dimitrios
N1 - Publisher Copyright:
© 2017 IEEE.
PY - 2018/1/4
Y1 - 2018/1/4
N2 - This paper focuses on the design of surface-acoustic-wave-(SAW)-based bandpass filters (BPFs) with enhanced fractional bandwidth (FBW) and constant in-band group delay (τg). They are based on a hybrid RF-design approach in which high-quality-factor (Q) SAW resonators are effectively combined with low-Q lumped elements (LEs). Contrary to conventional ladder-or lattice-type filter architectures, the devised configuration enables passbands that can simultaneously achieve: i) flat in-band τg, ii) FBWs that are larger than the electromechanical coupling coefficient (kt2) of its constituent substrate, and iii) Qs of the order of a thousand. In order to validate the proposed filter design approach, a two-pole/four-transmission-zero (TZ) prototype has been designed, manufactured, and measured. It exhibited passband bandwidth of 0.45 MHz, FBW of 1.4kt2, minimum in-band insertion loss of 1.5 dB, effective Q of 8,000, in-band return loss of 23 dB, and an average τΒ of 0.86 ps.
AB - This paper focuses on the design of surface-acoustic-wave-(SAW)-based bandpass filters (BPFs) with enhanced fractional bandwidth (FBW) and constant in-band group delay (τg). They are based on a hybrid RF-design approach in which high-quality-factor (Q) SAW resonators are effectively combined with low-Q lumped elements (LEs). Contrary to conventional ladder-or lattice-type filter architectures, the devised configuration enables passbands that can simultaneously achieve: i) flat in-band τg, ii) FBWs that are larger than the electromechanical coupling coefficient (kt2) of its constituent substrate, and iii) Qs of the order of a thousand. In order to validate the proposed filter design approach, a two-pole/four-transmission-zero (TZ) prototype has been designed, manufactured, and measured. It exhibited passband bandwidth of 0.45 MHz, FBW of 1.4kt2, minimum in-band insertion loss of 1.5 dB, effective Q of 8,000, in-band return loss of 23 dB, and an average τΒ of 0.86 ps.
KW - Acoustic-wave (AW) filter
KW - bandpass filter (BPF)
KW - constant group delay
KW - flat group delay
KW - kt2 enhancement
KW - RF/microwavefilter
KW - surface-acoustic-wave (SAW) resonator
UR - https://www.scopus.com/pages/publications/85046002605
U2 - 10.1109/IMWS-AMP.2017.8247384
DO - 10.1109/IMWS-AMP.2017.8247384
M3 - Chapter
AN - SCOPUS:85046002605
T3 - 2017 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications, IMWS-AMP 2017
SP - 1
EP - 3
BT - 2017 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications, IMWS-AMP 2017
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2017 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes, IMWS-AMP 2017
Y2 - 20 September 2017 through 22 September 2017
ER -