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Switched-bandwidth SAW-based bandpass filters with flat group delay

Switched-bandwidth SAW-based bandpass filters with flat group delay

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Tunable surface-acoustic-wave-(SAW)-based bandpass filters (BPFs) with flat in-band group delay (τ g) and variable passband bandwidth (BW) are reported. They are based on N hybrid acoustic-wave-lumped-element-resonator (AWLR) modules shaped by one lumped-element resonator and K RF-switched SAW resonators that are arranged in a Gaussian-type source-to-load impedance-inverter network. Fractional bandwidth (FBW) tuning is achieved by reconfiguring the number of SAW resonators within the AWLR modules. Major advantages of the proposed filter concept when compared to conventional SAW BPFs are as follows: (i) they do not depend on the electromechanical coupling coefficient (kt 2) of the SAW resonators – FBW>kt 2 can be realised –, (ii) they do not require lossy elements or SAW resonators with different frequencies, and (iii) they can be tuned. For experimental-validation purposes, a 433.9 MHz two-pole/four-transmission-zero prototype was built and measured. It exhibited flat-in-band-τ g passbands with discretely-tunable BW between 0.18 and 0.45 MHz (i.e. 2.5:1 tuning ratio).

References

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      • 1. Gong, S., Piazza, G.: ‘Multi-frequency wideband RF filters using high electromechanical coupling laterally vibrating lithium niobate MEMS resonators’. IEEE 26th Int. MEMS Conf., Taipei, Taiwan, 20–24 January 2013, pp. 785788.
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      • 2. http://abracon.com/Filters/SAW%20FILTERS/AFS14A35-1591.5-T3.pdf (accessed 5 January 2018).
    3. 3)
      • 3. Psychogiou, D., Gómez-García, R., Peroulis, D.: ‘RF design of acoustic-wave-lumped-element-resonator (AWLR)-based bandpass filters with constant in-band group delay’. IEEE Int. Microwave Symp., Honolulu, HI, USA, 4–9 June 2017, pp. 345348.
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      • 6. Wang, H., Chen, J., Shi, Y., et al: ‘Design of ladder-type SAW/BAW filters with constant group delay’. IEEE Ultrasonics Symp., Orlando, FL, USA, 18–21 October 2011, pp. 345348.
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2018.0082
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