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Jihong Pei

Bio: Jihong Pei is an academic researcher from Shenzhen University. The author has contributed to research in topics: Circulator & Insertion loss. The author has an hindex of 1, co-authored 1 publications receiving 4 citations.

Papers
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Journal ArticleDOI
Yong Wang1, Dengguo Zhang1, Biaogang Xu1, Zheng Dong1, Jihong Pei1, Shixiang Xu1 
TL;DR: In this article, a T-typed magneto-photonic crystals circulator consisting of Al2O3 ceramic rods array and ferrite posts was proposed and validated, based on the numerical simulations on the band gap of photonic crystals and the function of the circulator.

7 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the exchange-coupled effect between hard and soft magnetic phases has been investigated in hard/soft (H/S) nanocomposites with establishment of exchange coupled effect between the two phases.
Abstract: Bi-component hard (H) (hexaferrite) and soft (S) (spinel) ferrites nanocomposites are gaining interest scientifically and technically, not only for combining the high magnetization of spinel ferrite nanomaterials and the high coercivity of hexaferrite magnetic nanomaterials but also for the outstanding exchange-coupling behavior among hard and soft magnetic phase. The improved magnetic features lead to produce a new nanocomposite with higher microwave absorption capacity in comparison with ferrites with a single absorption mechanism. Exchange-coupled effect has a potential application based on microwave absorption, recording media, permanent magnets, biomedical and other applications. Intensive studies have been conducted on this topic to produce hard/soft (H/S) ferrite nanocomposites with establishment of exchange coupled effect between the two phases. Preparation methods, microstructure, magnetics features, microwave and dielectric properties, and applications are elaborated. Consequently, a comprehensive effort has been made to contain an original reference investigating in detail the precise outcomes of the published papers.

49 citations

Journal ArticleDOI
Biaogang Xu1, Dengguo Zhang1, Xierong Zeng1, Yong Wang1, Zheng Dong1 
TL;DR: In this article, the transmission characteristics of a millimeter wave photonic crystal waveguide formed by square lattice Al2O3 ceramic rods array are numerically and experimentally investigated.

6 citations

Journal ArticleDOI
TL;DR: The requirement of the comb line number is efficiently reduced, the in-band interference is greatly suppressed by introducing the polarization multiplexing and the photonic dual-output image-reject mixing and the proof-of-concept experiment is carried out.
Abstract: Microwave photonic channelizer based on coherent frequency combs (OFCs) enables processing of ultra-wideband RF signals using low-frequency components. The channel number usually equals to the comb line number of the OFCs and the bandwidth for the microwave input is determined by the frequency spacing of the OFCs. However, the generation of coherent OFCs with large comb lines and large frequency spacing is extremely challenging, limiting greatly the potential of the OFC-based channelizer. In this paper, a microwave photonic channelizer based on polarization multiplexing and photonic dual output image reject mixing is proposed and demonstrated. A broadband signal can be divided into 8 channels using only one optical carrier and a pair of dual-polarization local oscillators (DP-LOs). Each DP-LO has only 2 spectral lines with orthogonal polarization states. In addition, by introducing a pair of OFCs with $N$ comb lines, $8N$ channels can be output. The requirement of the comb line number is efficiently reduced, and the in-band interference is greatly suppressed by introducing the polarization multiplexing and the photonic dual-output image-reject mixing. A proof-of-concept experiment is carried out. An RF signal with 9.6-GHz bandwidth centered at 14 GHz is successfully divided into 8 channels with 1.2-GHz bandwidth, and the in-band interference is effectively suppressed for each channel. In addition, RF signals with 2.4-GHz bandwidth centered at 24.8 and 30.8 GHz are also successfully channelized, respectively.

5 citations

Journal ArticleDOI
TL;DR: In this article , the authors proposed a novel circulator design with a Ni1-xZnxFe2O4 ferrite sphere surrounded by a triangular array of crystalline rods.
Abstract: Future 6G communication systems call for ultrawide bandwidth in the terahertz (THz) frequency domain. Light signals propagating in photonic crystals – a functional optoelectronic material – experiences low loss in THz domain, making the material ideal for constructing devices for 6G signal processing. Adapting to such needs, we propose a novel circulator design with a Ni1-xZnxFe2O4 ferrite sphere surrounded by a triangular array of crystalline rods. The circulator achieves an operating bandwidth of 40.80 GHz at the center frequency of 0.136 THz (relative bandwidth of 31.10%) through the symmetric placement of a pair of circular aluminum plates. Sandwiching the ferrite sphere, the two plates effectively broaden the bandwidth through the external matching method yet maintain excellent isolation and insertion loss of 44.41 dB and 0.79 dB, respectively.

2 citations

Journal ArticleDOI
TL;DR: In this paper , a high-speed and highperformance optically controlled terahertz (THz) intensity modulator based on the free carrier modulation of a GaAs semiconductor was proposed.
Abstract: We have proposed and designed a high-speed and high-performance optically controlled terahertz (THz) intensity modulator based on the free carrier modulation of a GaAs semiconductor. The device comprises a photonic crystal cavity–waveguide coupling structure for operation in the THz region. This modulator benefits from the strong interaction between the THz wave and the photoconductive substance to obtain a deep modulation with GHz speed, even with a low external optical power. The finite element method was used to calculate the most important properties of the modulator, such as the modulation depth, insertion loss, and modulation rate. The proposed modulator also demonstrates external optical power-dependent characteristics. The results indicate that the THz intensity can be modulated at a switching frequency of 1 GHz with high modulation depths of 83 and 90.3% under the continuous wave laser pumping of 50 W/cm2 and 80 W/cm2, respectively. In addition, this modulator exhibits efficient performance under the same pumping power with a switching frequency of up to 3 GHz. The device exhibits higher modulation depths with higher laser power intensities. The outstanding properties of the proposed structure are promising for the development of modulators and switches in THz communication systems.

1 citations