A miniaturized frequency selective rasorber with tunable passband

Tu, Hao; Liu, Peiguo; Huang, Jie; Qin, Yujian

doi:10.1109/emceurope.2017.8094797

Cited by 14 publications

(3 citation statements)

References 9 publications

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“…In previous studies, a variety of FSRs have been proposed, most of which were constructed based on multi-layer configurations by cascading a lossy layer, a bandpass layer, and an air space that acts as a quarter-wavelength impedance transformer in between [3][4][5]. According to the relative locations of absorption and transmission bands, they could be classified into three categories: FSR with an absorption band below a transmission band (FSR-AT) [1,[6][7][8], FSR with a transmission band below an absorption band (FSR-TA) [9][10][11][12], and FSR with a transmission window between two absorption bands (FSR-ATA) [13][14][15][16][17][18][19][20][21][22][23][24][25]. In contrast to the former two, which yield only one absorption band, FSR-ATA usually presents better radar stealth performance but is also more complicated in design [19].…”

Section: Introductionmentioning

confidence: 99%

Miniaturised frequency selective surface‐based rasorber with wideband two‐sided absorption and switchable transmission/reflection band

Tang¹,

Liu²,

Zhou³

et al. 2023

IET Microwaves Antenna & Prop

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A new rasorber with a switchable transmission/reflection band between two wide absorption bands is proposed based on an ultrathin low-profile frequency selective surface. To miniaturise the periodicity in the lossy layer, convoluted elements and lumped capacitors are applied, while in the bandpass layer, non-resonate elements are implemented with PIN diodes embedded. Moreover, a square loop loaded with resistors is introduced to the bottom of the lossy layer, which consequently extends the bandwidth of the high-frequency absorption band without an increase in thickness. The simulation indicates that the proposed design presents a switchable transmission/reflection band in two-sided absorption bands with a periodicity of 0.089λ L (wavelength at the lowest operating frequency) and thickness of 0.066λ L . Angular stability and polarisation insensitivity are also obtained due to the low profile and symmetry. A prototype was fabricated and measured, according to which the switchable transmission band covers 3.67-3.93 GHz; the absorption bands cover 2.37-3.23 GHz and 4.09-6.63 GHz in the OFF state of the diodes, and 2.23-3.02 GHz and 4.01-6.53 GHz in the ON state. As reasonable agreements between the measurement and simulation results are observed, the performance of the design is verified. K E Y W O R D Sactive filters, diodes, frequency selective surfaces, radar absorbing materials Min Tang and Qikun Liu contributed equally to this work and should be considered as co-first authors.

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Section: Introductionmentioning

confidence: 99%

Miniaturised frequency selective surface‐based rasorber with wideband two‐sided absorption and switchable transmission/reflection band

Tang¹,

Liu²,

Zhou³

et al. 2023

IET Microwaves Antenna & Prop

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“…Based on this innovative concept, the 3-D FSRs can be designed to achieve high selectivity, low insertion loss or wide absorption band [12][13][14][15]. Of course, the existing FSRs can be sorted into three categories based on the relative locations of the transmission band and the absorption band: that with the transmission band above the absorption band [16][17], that with the transmission band below the absorption band [6], [12][13], [18], or the transmission band between two absorption bands [7], [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…So the active FSRs (AFSRs) is proposed, which can realize the performance of controlling electromagnetic characteristics through actively adjusting external excitation (e.g., dc voltage size, field energy and so on). The reported electrically controlled AFSRs are divided into two categories: the switchable type of AFSRs [19][20][21] and the tunable type of AFSRs [18], [22]. In general, the AFSRs are commonly loaded with active components, such as PIN diodes and varactor diodes, to achieve the reconfigurable performance.…”

Section: Introductionmentioning

confidence: 99%

Water-Based Reconfigurable Frequency Selective Rasorber With Thermally Tunable Absorption Band

Yan¹,

Kong

Wang³

et al. 2020

IEEE Trans. Antennas Propagat.

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In this paper, a novel water-based reconfigurable frequency selective rasorber (FSR) at microwave band is proposed, which has a thermally tunable absorption band above the transmission band. The water-based FSR consists of a bandpass type frequency selective surface (FSS) and a 3D printing container. The water substrate is filled into the sealed space constructed by the above two structures. The numerical simulation results show that the FSR can achieve absorption with high absorptivity from 8.3 to 15.2 GHz, and obtain a transmission band of 5.2 to 7.0 GHz. The minimum insertion loss of the transmission band reaches 0.72 dB at 6.14 GHz. In addition, the FSR has the reconfigurable characteristics of absorbing or reflecting electromagnetic waves by filling with water or not. The proposed water-based FSR shows its good transmission/absorption performance under different polarizations and oblique incident angles. Due to the Debye model of water, the absorption band can be adjusted by water temperature, while the passband remains stable. At last, prototype of the FSR based on water has been fabricated, and the experimental results are presented to demonstrate the validity of the proposed structure.

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Miniaturized frequency selective rasorber with a X‐band transmission band using cross band resonator

Ren

Jia

Zhai

et al. 2021

Int J RF Microw Comput Aided Eng

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This article designs a miniaturized frequency selective absorber (FSR) based on X‐band. The FSR consists of a resistor sheet and a bandpass frequency selective surface (FSS). It has a wide low frequency absorption band and a low insertion loss wide high frequency transmission band. The resistor element is a hexagonal metal ring with lumped resistance. Each side of the ring is inserted with three cross metal branches. The branch is equivalent to the λh/4 short‐circuit branch. Three types of branches with different lengths can be used to achieve wide‐band transmission. The band‐pass FSS is a three‐layer structure, which is composed of two layers of circular metal patches and a layer of circular aperture. The band‐pass FSS must coincide with the transmission band of the resistor sheet. The resistor sheet is placed on the band‐pass FSS. At low frequencies, FSR functions as an absorber. The absorption bandwidth of 10 dB is 2.2 to 6.3 GHz. At high frequencies, the transmission band is almost transparent. At this time, the 1 dB transmission bandwidth is 8.1 to 12.1 GHz. FSR has good angular stability and polarization stability. A prototype of the structure was made and measured to verify the correctness of the design.

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A miniaturized frequency selective rasorber with tunable passband

Cited by 14 publications

References 9 publications

Miniaturised frequency selective surface‐based rasorber with wideband two‐sided absorption and switchable transmission/reflection band

Miniaturised frequency selective surface‐based rasorber with wideband two‐sided absorption and switchable transmission/reflection band

Water-Based Reconfigurable Frequency Selective Rasorber With Thermally Tunable Absorption Band

Miniaturized frequency selective rasorber with a X‐band transmission band using cross band resonator

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