| The magnetoelectric layered structure is made of ferromagnetic phase andpiezoelectric phase. According to the ferromagnetic resonance effect in theferromagnetic phase and the electrostrictive effect in the piezoelectric phase, thestructure can achieve the a FMR frequency shift over a wide range by the magneticfield and a fast FMR frequency drift through an applied electric field over a smallrange. Through the combination of magnetoelectric layered structure and traditionalmicrowave devices, different kinds of magnetically and electrically dual-tunablemicrowave devices such as magnetoelectric tunable filters, resonators, phase shifters,delay lines can be achieved. These new magnetically and electrically dual-tunablemicrowave devices have the advantages of small volume, low power consumption,fast turning speed. Because of the superiority of the magnetoelectric layeredstructure in the multifunctional microwave devices and equipment application,which cause a great interest of researchers, the structure become a new direction ofresearch in recent years.Although there has been a lot of research on the production process ofmagnetoelectric layered structure, magnetoelectric coupling effect and themagnetoelectric dual-tunable microwave devices, the following questions aredefinitely worth answering: Firstly, the design of complex devices for the users is animportant problem to be solved. Secondly, in the making process of microwavedevices, the working process of magnetoelectric layered structure is extraordinarycomplex and the cost is expensive. In order to make the cost less and ensure the sizeof layered structure, it needs the simulation of devices before manufacture.Unfortunately, electromagnetic simulation is very onerous and time-consuming. Itrequires a new simulation method which can quickly predict and optimize theperformance and magnetical and electrical tuning of the device.In view of the above problems, this paper carried out the following work: firstly,according to the magnetoelectric coupling effect, ferromagnetic resonance effect andinfluence of piezoelectric phase, the coupling factor between the structure andinput/output microstrip is introduced, a generalized lumped element modeling for electrically and magnetically dual-tunable coupled microstrip filters based on asingle magnetoelectric layered structure is established. Then the generalized lumpedelement modeling is used to predict the magnetoelectric tuning of its workingfrequency. Its results show a good agreement with the experimental results and theelectromagnetic simulation results both in quality and quantity. On this basis, theimpact of applied electric field, the structure’s size, the microstrip’s size and thedistance between the structure and the microstrips on the filter performance ispredicted and analyzed.Secondly, based on the generalized lumped element modeling for electricallyand magnetically dual-tunable coupled microstrip filters with a singlemagnetoelectric layered structure, the generalized lumped element modelings forelectrically and magnetically dual-tunable coupled microstrip filters and multiplebandpass filters with a plurality of structures are established. The filters with twostructures are selected as the objects, and the magnetoelectric tuning of the workingfrequency is predicted, and the effectiveness of the modeling is proven by comparingthe results with the electromagnetic simulation results.In addition, according to the FMR resonance effect and magnetoelectriccoupling effect, we designed a magnetoelectric tunable dual-band bandpass filterbased on the layered structure and microstrips which is used during the2GHz to10GHz frequency range. The electromagnetic simulation result shows that theinsertion loss of passband part is well, while the maximum insertion loss of stopbandpart is-20dB. Compared with traditional bandpass filter, this filter has advantages,such as small volume, high efficiency, low energy consumption, and it greatlyimprove the device flexibility. It has a good application prospect. |
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