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Magnet-Free Miniaturized Circulator Based on Non-Reciprocal Network

In this paper, a miniaturized, ultra-wideband, high isolation circulator with improved non-magnetic non-reciprocal space-time regulation is proposed. The traditional ferrite circulator relies on an external magnetic field to break the reciprocity, and the circulator is bulky, expensive, and difficult to integrate. The non-magnetic non-reciprocal circulator in this paper breaks the reciprocity through periodic spatiotemporal modulation. Compared with the previous microstrip structure, this paper adds a periodically loaded transmission line (PLTL) and along with discontinuous structured guard lines (DSGLs). which increases the bandwidth, reduces the size, and increases the larger isolation and gain. The non-magnetic non-reciprocal time-space controlled circulator is simulated, and the simulation results show that it has a bandwidth of DC to 1. 4GHz, the insertion loss is about 1dB, and the isolation is more than 35dB. This design can be applied in full duplex systems.