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- W4238472025 abstract "PAGE 741 A low-loss hollow-core photonic crystal fibre (HV-PCF) which operates in the terahertz (THz) frequency range is proposed by researchers from Bangladesh. The HV-PCF has a total diameter of 2.75 mm and consists of a regular hexagonal lattice structure with four air-hole rings and a larger central air-hole. The fibre has an extremely low effective material loss of 0.0122 cm−1 obtained at 2.125 THz with 94% of air-core power fraction. PAGE 704 French and Canadian researchers present an air-filled substrate integrated waveguide (AFSIW) slot array antenna, for use in high-performance substrate integrated millimetre-wave systems. When compared with the conventional dielectric-filled SIW, the AFSIW design displays a narrower beam (44% and 18% narrower H- and E-plane half-power beamwidth), and enhanced efficiency (improved by 1.6%). Cross-section of hexagonal lattice structure of crystal fibre able to operate in THz range. PAGE 726 A balanced ring hybrid with arbitrary power division ratio was fabricated by embedding four half-wavelength microstrip lines in the single-ended ring hybrid. The design from China, displays arbitrary differential-mode power division, good common-mode suppression and low insertion loss and high realisable maximum k2. Air-filled substrate integrated waveguide slot array antenna. PAGE 717 An image-compressive sensing preprocessing algorithm is proposed by researchers from China. The collaboration reduced rank (CRR) algorithm is based on nonlocal sparsity and a nonlocal low-rank regularisation reconstruction algorithm (NLR-CS). The method outperforms current compressive sensing reconstruction methods in peak-signal-to-noise and visual perception. Photograph of balanced ring hybrid with arbitrary power division. PAGE 702 Researchers from Korea present a method for supressing surface waves on a microstrip antenna array at the millimetre-wave frequency. Complimentary split ring resonator (CSRR) structures are etched on the ground plane of a 10×2 microstrip array. Measured results show a gain improvement of 2.5 dB and a side lobe level reduction of 3.5 dB. Its light weight, low volume and thin profile make it suitable for radar applications. Image compressive sensing preprocessing algorithm proposed. Microstrip array antenna with etched on CSRR structures for supressing side waves." @default.
- W4238472025 created "2022-05-12" @default.
- W4238472025 date "2017-05-01" @default.
- W4238472025 modified "2023-09-25" @default.
- W4238472025 title "in brief" @default.
- W4238472025 doi "https://doi.org/10.1049/el.2017.1705" @default.
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