Lumped-equivalent circuit model for multi-stage cascaded magnetoelectric dual-tunable bandpass filter

doi:10.1088/1674-1056/24/10/107506

Abstract A lumped-equivalent circuit model of a novel magnetoelectric tunable bandpass filter, which is realized in the form of multi-stage cascading between a plurality of magnetoelectric laminates, is established in this paper for convenient analysis. The multi-stage cascaded filter is degraded to the coupling microstrip filter with only one magnetoelectric laminate and then compared with the existing experiment results. The comparison reveals that the insertion loss curves predicted by the degraded circuit model are in good agreement with the experiment results and the predicted results of the electromagnetic field simulation, thus the validity of the model is verified. The model is then degraded to the two-stage cascaded magnetoelectric filter with two magnetoelectric laminates. It is revealed that if the applied external bias magnetic or electric fields on the two magnetoelectric laminates are identical, then the passband of the filter will drift under the changed external field; that is to say, the filter has the characteristics of external magnetic field tunability and electric field tunability. If the applied external bias magnetic or electric fields on two magnetoelectric laminates are different, then the passband will disappear so that the switching characteristic is achieved. When the same magnetic fields are applied to the laminates, the passband bandwidth of the two-stage cascaded magnetoelectric filter with two magnetoelectric laminates becomes nearly doubled in comparison with the passband filter which contains only one magnetoelectric laminate. The bandpass effect is also improved obviously. This research will provide a theoretical basis for the design, preparation, and application of a new high performance magnetoelectric tunable microwave device.

Keywords: microwave magnetoelectric effect lumped-equivalent circuit magnetoelectric tunable microwave device multi-stage cascaded filter

Received: 04 February 2015
Revised: 30 May 2015
Accepted manuscript online:

PACS:	75.85.+t	(Magnetoelectric effects, multiferroics)
	76.50.+g	(Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance)
	84.40.Dc	(Microwave circuits)
	85.80.Jm	(Magnetoelectric devices)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11172285 and 11472259) and the Natural Science Foundation of Zhejiang Province, China (Grant No. LR13A020002).

Corresponding Authors: Zhou Hao-Miao
E-mail: zhouhm@cjlu.edu.cn

Cite this article:

Zhang Qiu-Shi (张秋实), Zhu Feng-Jie (朱锋杰), Zhou Hao-Miao (周浩淼) Lumped-equivalent circuit model for multi-stage cascaded magnetoelectric dual-tunable bandpass filter 2015 Chin. Phys. B 24 107506

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Lumped-equivalent circuit model for multi-stage cascaded magnetoelectric dual-tunable bandpass filter

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