A Radio Frequency Nonreciprocal Network Based on Switched Acoustic Delay Lines
A Radio Frequency Nonreciprocal Network Based on Switched Acoustic Delay Lines
复制标题
基于切换声学延迟线的射频不可逆网络
DOI：
10.1109/tmtt.2019.2895577
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发表时间：
2018
影响因子：
4.3
通讯作者：
S. Gong
中科院分区：
文献类型：
--
作者：
Ruochen Lu;T. Manzaneque;Yansong Yang;Liuqing Gao;A. Gao;S. Gong
本文介绍了第一种基于开关低损耗声学延迟线的非互易网络。四端口环行器是建立在最近报道的频率无关，可编程，非互易框架的基础上切换延迟线。这种系统的设计空间，包括插入损耗（IL）和谐波响应的起源，从理论上研究，说明更好的性能和低成本的调制信号合成的关键在于大的延迟。为了实现一个大的延迟，我们采取内部制造的低损耗，宽带铌酸锂（LiNbO3）SH0模式声学延迟线采用单相单向换能器。四端口环行器，由两个开关模块和一个延迟线模块，已模块化设计，组装和测试。设计过程采用时域全电路仿真，仿真结果与实测结果吻合良好。IL（6.6 dB）和隔离度（25.4 dB）之间的18.8 dB的非互易对比度已经实现了8.8%的分数带宽，中心频率155 MHz，使用创纪录的低开关频率877.19 kHz。环行器还显示了25.9 dB的抑制内调制音和30 dBm的IIP3。在进一步的发展，这样的系统可能会导致未来的宽带，低损耗芯片级非互易射频系统具有前所未有的可编程性。
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.
影响因子：
16.6
作者：
Dinc T;Tymchenko M;Nagulu A;Sounas D;Alu A;Krishnaswamy H
通讯作者：
Krishnaswamy H