SAW filters with reconfigurable transition bands

Mouthaan, Koen; Galipeau, J.; Briot, E.; Abbott, B. P.

doi:10.1109/fcs.2012.6243601

Cited by 5 publications

(2 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To the best of the author's knowledge, this is the first acoustic-wave resonator-based BPF that functionalizes tunable transfer function in terms of multiple analog adaptive characteristics and high effective Q. Note that the acoustic-wave resonator-based filter architecture in [16] exhibits only two reconfigurable BW states, whereas the filter configuration in [17] demonstrates only two centerfrequency states with effective Q around 650-750.…”

Section: A Single-band Awlr Bpf At 418 Mhzmentioning

confidence: 99%

“…They are primarily based on RF-switched parallelized-filter/resonator architectures and are typically limited to two discrete states as, for example, in [16] and [17], in which BPFs with two BW (upper passband tuning) and two center-frequency states are, respectively, described. Recently, electronically reconfigurable materials have been monolithically integrated within the acoustic-wave resonator volume to enable intrinsically switched transfer functions [18], [19].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Single and Multiband Acoustic-Wave-Lumped- Element-Resonator (AWLR) Bandpass Filters With Reconfigurable Transfer Function

Psychogiou

Gómez‐García

Peroulis

2016

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

New types of single-and multiband acoustic-wave resonator-based bandpass filters (BPFs) with continuously variable transfer function in terms of bandwidth (BW), selectivity, and out-of-band isolation (IS) are presented. They are based on single-/multiband resonant branches that are shaped by high-quality-factor ( Q) acoustic-wave-lumped-element resonators (AWLRs) and are connected in parallel to an all-pass network through variable impedance inverters. With the proposed configuration, quasi-elliptic-type passbands with wide fractional BWs (FBWs)-i.e., larger than the electromechanical coupling coefficient k 2 t of its constituent acoustic-wave resonator-can be realized and continuously tuned while preserving the high-Q characteristics of its acoustic-wave resonators. Furthermore, by reconfiguring the location of the transmission zeros (TZs) of the AWLRs, tunable out-of-band IS profiles and asymmetrical passband BWs can be created. The operating principles of the devised spectrally agile filter concept are demonstrated through coupling-matrix-based synthesis and linear-circuit simulations. They are experimentally validated at the UHF band through the realization of: 1) a three-pole/six-TZ single-band prototype at 418 MHz with tunable BW between 0.16 and 0.49 MHz (FBW: 0.5-1.5k 2 t ) for an insertion loss (IL) between 3.3 and 1.2 dB (i.e., effective Q > 10 000), reconfigurable order (firstto-third-order states), out-of-band IS controllability in terms of BW (18-26.5 MHz at the upper stopband) and magnitude (23-46 dB at 426 MHz), and an intrinsically selectable allpass mode and 2) a six-pole/nine-TZ dual-band BPF with two transmission bands located at 418 and 433.9 MHz. They, respectively, feature symmetrical and asymmetrical BW tuning between 0.3-0.54 and 0.6-1.23 MHz with in-band IL <1.7 dB for all tunable states.Index Terms-Acoustic-wave filter, bandpass filter (BPF), k 2 t enhancement, multiband filter, quasi-elliptic-type filter, reconfigurable filter, RF/microwave filter, surface-acoustic-wave (SAW) resonator, tunable filter. 0018-9480

show abstract

Section: A Single-band Awlr Bpf At 418 Mhzmentioning

confidence: 99%