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- 实验方案
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Angle-of-Arrival Measurement System Using Double RF Modulation Technique
摘要： A new technique for determining the angle of arrival (AoA) of an RF signal is presented. It is based on a cascaded modulator structure, where continuous wave light from an optical source is modulated by an incoming RF signal twice. The AoA of an RF signal can be determined by the system output RF signal power. The proposed structure is capable for measuring the AoA of both narrow and broadband RF signals. This overcomes the limitation in all previously reported photonics-based AoA measurement systems, which are applicable to either a single-frequency RF signal or a broadband RF signal. It also does not involve electrical components and high extinction ratio modulators, which are required in reported structures. Experimental results are presented that show an AoA measurement range of 0° to over 65° with errors of less than 1.9° for a microwave signal at 2.65 and 12.62 GHz. Results also show that the system is capable to measure the AoA of a pseudorandom binary sequence signal at a microwave frequency.
关键词： notch filters,Direction-of-arrival estimation,phased arrays,microwave photonics
更新于2025-09-23 15:22:29
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Ultra-compact SSPP waveguides and notch filters based on double-sided parallel-strip lines
摘要： In this paper, we propose a new variety of strong field confinement, ultra-compact size, easy-to-integrate spoof surface plasmon polariton (SSPP) waveguides based on double-sided parallel-strip lines (DSPSL), which are formed by etching opposite spiral grooves on the upper and lower metal layers of the DSPSL. By analyzing the dispersion characteristics, we found that the opposite spiral grooves can significantly reduce the asymptotic frequency of the dispersion curve. Compared with the conventional comb-shaped SSPP structures at the same asymptotic frequency, the size of the structure is reduced to 19.85%, which facilitates miniaturization and integration of microwave devices. A broadband transition is also designed to achieve smooth impedance and momentum matching for the proposed SSPP waveguide. Owing to the dual-conductor structure, the proposed waveguides can be easily integrated with active devices and can also support low-frequency or time-domain signals without causing distortions. The proposed SSPP waveguides have strong field confinement and can concentrate the field around the spiral groove, implying great potential applications in sensing and detection. In parallel, we also designed two notch filters based on the proposed SSPP waveguide, which can achieve adjustable narrowband or broadband filtering by loading different capacitors. The proposed design can be widely used in various plasmonic devices, which opens up a new door to build up large-scale plasmonic integrated circuits in the microwave and terahertz regimes.
关键词： Spoof surface plasmon polaritons,parallel-strip lines,waveguides,notch filters
更新于2025-09-19 17:13:59