A Radio Frequency Non-reciprocal Network Based on Switched Acoustic Delay Lines
| Autor: | Lu, Ruochen, Manzaneque, Tomas, Yang, Yansong, Gao, Liuqing, Gao, Anming, Gong, Songbin |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | IEEE Transactions on Microwave Theory and Techniques, vol. 67, no. 4, pp. 1516-1530, April 2019 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1109/TMTT.2019.2895577 |
| Popis: | This work demonstrates the first non-reciprocal network based on switched low-loss acoustic delay lines. The 4-port circulator is built upon a recently reported frequency-independent, programmable, non-reciprocal framework based on switched delay lines. The design space for such a system, including the origins of the insertion loss 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, wide-band lithium niobate (LiNbO3) SH0 mode acoustic delay lines employing single-phase unidirectional transducers (SPUDT). The 4-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. A 18.8 dB non-reciprocal contrast between insertion loss (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 intra-modulated tone and 30 dBm for IIP3. Upon further development, such a system can potentially lead to future wide-band, low-loss chip-scale nonreciprocal RF systems with unprecedented programmability. Comment: 13 pages, 23 figures |
| Databáze: | arXiv |
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