Email alert
RSSLatest Articles
Articles in press have been peer-reviewed and accepted, which are not yet assigned to volumes/issues, but are citable by Digital Object Identifier (DOI).
Display Method:
, Available online , doi: 10.11884/HPLPB202638.250271
Abstract:
Background Purpose Methods Results Conclusions
In recent years, reflectarray antennas have received significant attention and research in the high-power microwave field due to their low profile, conformability, and spatial feed characteristics. Multi-frequency reflectarray antennas can share the same antenna plane while providing differentiated beam steering at different frequencies, resulting in greater system platform adaptability. However, these antennas commonly face the challenges of limited power handling capacity and low aperture efficiency.
This paper aims to propose a phase synthesis method for high-power, dual-band reflectarray antennas, which enhances their power handling capacity and aperture efficiency. This approach is universally applicable to the design of multi-frequency reflectarray antennas.
The proposed phase synthesis method incorporates reference phase optimization and screening threshold techniques. It takes into account the reflected phase and electric field intensity of the antenna elements under different incident wave conditions. This approach effectively increases power capacity and aperture efficiency.
We designed an improved reflectarray antenna element and applied the proposed phase synthesis method to a dual-band reflectarray antenna design. A 27×27 array operating at 4.3 GHz and 10.0 GHz achieved aperture efficiencies of 67.37% and 48.69%, respectively, with a power capacity of hundreds of megawatts in a vacuum environment.
The proposed phase synthesis method has been successfully validated, proving its effectiveness in designing high-performance, high-power, dual-frequency, and multi-frequency reflectarray antennas.
, Available online , doi: 10.11884/HPLPB202537.250138
Abstract:
Background Purpose Methods Results Conclusions
High-power microwave (HPM) pulses, which can interfere with or damage electronic components and circuits, have attracted considerable research interest in recent years. Aperture coupling represents a primary mechanism for such pulses to penetrate shielded metallic enclosures, significantly affecting the electromagnetic compatibility and resilience of electronic systems. Although substantial studies have focused on shielding effectiveness and resonant behaviors, the spatial distribution of coupling parameters—particularly the extent of strongly coupled regions within the cavity—remains inadequately investigated. This paper proposes a quantitative metric termed “the coverage rate of strong-coupled region” to better evaluate HPM backdoor coupling effects.
The objective is to systematically examine the influence of key HPM waveform parameters on this coverage rate within a representative metallic cavity.
A three-dimensional simulation model of a rectangular metallic cavity with an aperture was developed using the finite-difference time-domain (FDTD) method. The internal field distribution was monitored via an array of electric field probes. Numerical simulations were performed to assess the effects of various HPM parameters, including frequency, pulse width, the pulse rise time, and polarization angle, on the coverage of strongly coupled regions.
The coverage rate was markedly higher at the cavity’s inherent resonant frequencies than at non-resonant frequencies. Increasing the pulse width led to a saturation of coverage beyond a specific threshold. Variations in polarization angle from horizontal to vertical considerably enhanced the coverage, with vertical polarization yielding the maximum value. Superimposing multiple resonant frequencies effectively compensated for weakly coupled areas, further increasing the overall coverage. In contrast, the pulse rise time had a negligible effect on the coverage rate. The proposed the coverage rate of strong-coupled region effectively addresses the practical dilemma wherein strong local coupling does not necessarily lead to significant system-level effects.
This metric provides a quantitative basis for optimizing the alignment between sensitive components and highly coupled zones. Frequency and polarization are identified as decisive parameters for enhancing coupling effectiveness, while pulse width and multi-frequency excitation can be utilized to achieve more uniform and robust coupling coverage. These findings offer valuable guidance for the design and assessment of HPM protection measures and electromagnetic compatibility analysis.
