A radio frequency nonreciprocal network based on switched acoustic delay lines

Ruochen Lu, Tomas Manzaneque, Yansong Yang, Liuqing Gao, Anming Gao, Songbin Gong

Research output: Contribution to journalArticle

Abstract

This paper demonstrates the first nonreciprocal network based on switched low-loss acoustic delay lines. The four-port circulator is built upon a recently reported frequency-independent, programmable, nonreciprocal framework based on switched delay lines. The design space for such a system, including the origins of the insertion loss (IL) and harmonic responses, is theoretically investigated, illustrating that the key to better performance and low-cost modulation signal synthesis lies in a large delay. To implement a large delay, we resort to in-house fabricated low-loss, wideband lithium niobate (LiNbO3)SH0 mode acoustic delay lines employing single-phase unidirectional transducers. The four-port circulator, consisting of two switch modules and one delay line module, has been modularly designed, assembled, and tested. The design process employs time-domain full circuit simulation, and the results match well with measurements. An 18.8-dB nonreciprocal contrast between IL (6.6 dB) and isolation (25.4 dB) has been achieved over a fractional bandwidth of 8.8% at a center frequency 155 MHz, using a record low switching frequency of 877.19 kHz. The circulator also shows 25.9-dB suppression for the intramodulated tone and 30 dBm for IIP3. Upon further development, such a system can potentially lead to future wideband, low-loss chip-scale nonreciprocal radio frequency systems with unprecedented programmability.

Original languageEnglish (US)
Article number8641432
Pages (from-to)1516-1530
Number of pages15
JournalIEEE Transactions on Microwave Theory and Techniques
Volume67
Issue number4
DOIs
StatePublished - Apr 2019

Fingerprint

Acoustic delay lines
acoustic delay lines
Electric delay lines
Insertion losses
radio frequencies
delay lines
insertion loss
Circuit simulation
Switching frequency
modules
broadband
Transducers
Lithium
Switches
Modulation
lithium niobates
Bandwidth
isolation
transducers
switches

Keywords

  • Acoustic delay line
  • SH0 mode
  • full-duplex radios
  • lithium niobate
  • magnetless circulator
  • microelectromechanical systems
  • nonreciprocity
  • piezoelectricity
  • simultaneous transmit and receive (STAR)

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

A radio frequency nonreciprocal network based on switched acoustic delay lines. / Lu, Ruochen; Manzaneque, Tomas; Yang, Yansong; Gao, Liuqing; Gao, Anming; Gong, Songbin.

In: IEEE Transactions on Microwave Theory and Techniques, Vol. 67, No. 4, 8641432, 04.2019, p. 1516-1530.

Research output: Contribution to journalArticle

Lu, Ruochen ; Manzaneque, Tomas ; Yang, Yansong ; Gao, Liuqing ; Gao, Anming ; Gong, Songbin. / A radio frequency nonreciprocal network based on switched acoustic delay lines. In: IEEE Transactions on Microwave Theory and Techniques. 2019 ; Vol. 67, No. 4. pp. 1516-1530.
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