Abstract
A tunable dual-band metamaterial filter based on crossed split-ring resonators is numerically and experimentally demonstrated. The proposed tunable metamaterial filter consists of two same metal split rings with different angles. Based on the cross-coupling between these two split rings, two stopbands are generated. Moreover, the operating frequency of the two stopbands can be tuned by changing the angle between the two split rings. In the context of numerical results, surface current distributions and electric field distributions were employed to analyze the basic principle, and the experiments were performed to demonstrate the practical effect. All results verified the tunable characteristics of the proposed metamaterial filter. This design proposes a new tunable metamaterial filter through the angle rotation.
Highlights
Filters are passive devices commonly used to selectively eliminate undesired information and restrain the noise of the signal in the microwave and millimeter-wave systems, which plays an important role in imaging, sensors, and communication [1], [2]
At the frequency of 5.97 GHz, the surface current mainly distributes in the second split-ring resonators (SRRs) and the weak resonance occurs on the first SRR, which verifies that the resonance in the second SRR plays a major role at this operating frequency
We proposed a tunable dual-band filter based on the crossed split-ring resonators
Summary
Filters are passive devices commonly used to selectively eliminate undesired information and restrain the noise of the signal in the microwave and millimeter-wave systems, which plays an important role in imaging, sensors, and communication [1], [2]. Traditional methods of achieving wideband are by using microstrip resonator, etching slot, or adopting dielectric resonator [8]-[10] These methods can not completely satisfy the demands due to the complex structure, bulky volume, fixed operating bandwidth, or high cost. By changing the effective inductance or capacitance of the metamaterials through the modulations of external voltage, magnetic field, temperature, and so on, the tunable metamaterial filters can be achieved [23]-[27] Except for these external field modulation methods, the mechanically tunable metamaterial filters were reported [28]. We propose a crossed split-ring structure for the design of a tunable dual-band bandstop filter. This compact metamaterial filter is only composed of two same crossed split rings. The operating frequency of the filter is modified by the rotation angle, which provides a novel design idea for actively tunable bandstop metamaterial filters
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