Fig. 7: First MCM with three magnets.

A Schematics of the prototype. It is an active ring circuit comprising electric and magnetic parts. The magnonic part is a YIG film with three fixed places (i.e., depicted by the circles numbered 1, 2, and 3) for three different magnets to be placed on top of the film. There are three input and three output antennas to connect electric and magnetic parts. There are three voltage-tunable bandpass filters at the output ports. The filters at output ports #1, #2, and #3 are set to the central frequencies \({f}_{1}=\) 2.539 GHz, \({f}_{2}=\) 2.475 GHz, and \({f}_{3}=\) 2.590 GHz, respectively. B The cross-section of the passive magnonic part. It consists from the bottom to the top of a permanent magnet made of NdFeB, a Printed Circuit Board (PCB) substrate with six short-circuited antennas, a ferrite film made of GGG substrate and YIG layer, and a plastic plate with three pits for magnets to be inserted. The permanent magnet is aimed to create a constant bias magnetic field. C The photo of the PCB with six antennas. The characteristic size of the antenna is 2 mm in length and 0.15 mm in width.