This paper proposes a frequency selective absorber with a notch reflection band. It consists of a lossy layer and a metal ground. The lossy layer is composed of the octagonal ring and meander‐line resonators connected in parallel on the same plane, which are used to obtain a wide absorption band and a notch reflection band, respectively. The simulation results show that there are two absorption bands from 2.22 to 6.8 GHz and 7.94 to 8.54 GHz, and there is a −3dB reflection band from 7.14 to 7.68 GHz. Moreover, the absorber also has the characteristics of compact structure, polarization‐independent, and angular stability. The equivalent circuit has been established and explained the performance of the proposed band‐notched absorber. The proposed band‐notched absorber is manufactured and measured, and the results are generally in good agreement with the full‐wave simulation results.
A stepped graphene metamaterial terahertz absorber is proposed to achieve wideband absorption characteristics. By etching the rectangular groove on the surface of graphene and dynamically adjusting the length and the width of the rectangular groove, we improved the absorptivity up to 0.9475 and obtained a broadband absorption band of 5.885 THz. In addition, the absorber has the characteristics of electrical tunability, polarization independence, and large angle absorption, which improve the utilization of light waves. The graphene metamaterial absorbers proposed in this paper have potential applications in the fields of stealth and photoelectric conversion.
This communication proposes a wide-bandwidth planar inverted-F antenna (WPIFA) and a tunable planar inverted-F antenna (TPIFA), which are realized by manipulating two resonant modes of TM 0,1=2 and TM 0,3=2 . For WPIFA, the dual resonance modes TM 0,1=2 and TM 0,3=2 are made close to each other by appropriately using a pair of shorting pins and etching a Ω-shaped slot on the surface of the patch to increase the bandwidth. To realize the tunable bandwidth, on the basis of WPIFA, the Ω-shaped slot is modified to close the protruding part, and three PINs are used to control the on-off between the closed part and the outside. It is formed that when the PIN is turn off and on, respectively, TPIFA works in the TM 0,1=2 mode, and works in both the TM 0,1=2 and TM 0,3=2 modes. So that the working bandwidth of TPIFA is switched between narrowband and wideband. The prototype processing and testing of the antennas show that it has excellent performance under low profile (0:033λ 0 ). Among them, the impedance bandwidth of WPIFA is 3.3-3.77 GHz (13.3%), while TPIFA is 3.27-3.56 GHz (8.5%) and 3.26-3.75 GHz (14%) respectively, when the PIN is off and on.
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