Wide transmission band rasorber of center‐connected pattern with multi‐resonators

Abstract

A wide-transmission band rasorber is proposed in this letter. The structure consists of an lossy layer and a lossless layer. Since we find that the centerconnected pattern can achieve a wider bandwidth than the loop pattern, the lossy layer abandons the traditional loop pattern but uses a center-connected pattern to cascade multiple resonators. In addition, we proposed a new co-use resonator to further broaden the bandwidth. The simulated results show that the proposed rasorber has a transmission band (S21 〉 −1 dB) from 6.3 to 8.57 GHz, and the absorption band (S11 〈 −10 dB) is from 1.9 to 5 GHz. A prototype was fabricated and measured to validate our design. The simulated and measured results show good agreement, which prove the effectiveness of our design method. Compared with the previous FSRs, the proposed FSR yields a wider relative bandwidth with fewer resonators and can be fabricated more easily.

Wideband dual‐polarized rasorber design with genetic algorithm synthesis

“…To get wide transmission band, low-quality factor (Q) value of parallel resonant circuit is needed. 12 It is provided by higher inductance and lower capacitance value of the proposed resistive layer resonator. The proposed resonator provides a symmetric shape for dual polarization, high inductance and low capacitance of parallel resonant section for wideband operation.…”

“…Parallel microstrips are connected with lumped resistors at the edge. To get wide transmission band, low‐quality factor ( Q ) value of parallel resonant circuit is needed 12 . It is provided by higher inductance and lower capacitance value of the proposed resistive layer resonator.…”

“…There are studies published recent years which has wide transmission band designs. [10][11][12] There are also rasorber designs in literature which provide wide absorption band. 13 In literature, design procedure of rasorbers starts by proposing resonator shapes of resistive and bandpass layers and estimating equivalent circuit models (ECM) represented by lumped element inductor, capacitor and resistors.…”

“…In addition, rasorbers can be categorized with respect to bandwidths. There are studies published recent years which has wide transmission band designs 10–12 . There are also rasorber designs in literature which provide wide absorption band 13 …”