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Related Concept Videos

Beams with Symmetric Loadings01:15

Beams with Symmetric Loadings

484
The moment-area method is an analytical tool used in structural engineering to determine the slope and deflection of beams under various loads. Consider a cantilever with a concentrated load and moment at the free end. The first step is constructing a free-body diagram to calculate the reactions at the fixed end. Next, the bending moment diagram is plotted to visualize how the bending moment varies along the beam's length, focusing on points where the bending moment equals zero.
The M/EI...
484
Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

488
Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
488

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Related Experiment Video

Updated: Mar 29, 2026

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A Low-Cost Two-Dimensional Scalable Active Receive Phased Array with 8 Simultaneously Reconfigurable Beams.

Haifu Zhang1,2, Li-Xin Guo1, Shubo Dun2

  • 1School of Physics, Xidian University, Xi'an 710071, China.

Micromachines
|March 28, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a compact phased array system capable of generating eight independent beams for dual-circularly polarized signals. The novel "full-aperture multiplexing" method enhances efficiency and reduces size for advanced communication systems.

Keywords:
analog beamforming networkdual circular polarizationmulti-beamphased array

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Area of Science:

  • Electrical Engineering
  • Antenna Theory
  • Microwave Engineering

Background:

  • Phased array antennas are crucial for modern wireless communication systems.
  • Existing designs often face challenges with size, cost, and beam reconfigurability.
  • Dual-circular polarization offers advantages in signal integrity and interference mitigation.

Purpose of the Study:

  • To design and implement a compact multi-beam, dual-circularly polarized phased array receiving system.
  • To achieve eight independently reconfigurable beams with flexible polarization and scanning.
  • To enhance aperture utilization efficiency and reduce overall array footprint.

Main Methods:

  • Utilized a "full-aperture multiplexing" beamforming technique for shared aperture.
  • Employed a scalable architecture with identical receiving subarrays and beneath-aperture modules.
  • Implemented a heterogeneous integration scheme for high-density functional chip integration.
  • Adopted multi-level combining networks using different dielectric substrates.

Main Results:

  • A prototype 16x16 array was developed and tested.
  • Achieved array gain reduction of no more than 4 dB at a 60° scanning angle.
  • Maintained a system gain-to-noise-temperature ratio (G/T) of at least 0.9 dB/K at boresight (11.7 GHz).
  • Reduced overall array footprint by approximately 30%.

Conclusions:

  • The proposed multi-beam dual-circularly polarized phased array architecture is feasible for engineering implementation.
  • The system demonstrates effective performance in terms of gain, G/T, and beam reconfigurability.
  • The design offers a cost-effective and scalable solution for advanced receiving systems.