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Related Concept Videos

Maximum Power Transfer01:16

Maximum Power Transfer

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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...
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In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
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Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
The load connected draws the current, and the circuit delivers the power to the load. The alternating current flowing through the load is determined using the rectangular form of voltages, currents, network impedance, and load impedance. The average power delivered to the load is obtained from the product of the square of current and load resistance.
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Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
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Parallel Resonance01:23

Parallel Resonance

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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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Biasing of FET01:22

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Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
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Related Experiment Video

Updated: Mar 29, 2026

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Directivity Maximization of Difference Patterns for Monopulse Microstrip Patch Arrays with Sidelobe Constraints.

Weizong Li1, Yong-Chang Jiao1, Yixuan Zhang1

  • 1National Key Laboratory of Radar Detection and Sensing, Xidian University, Xi'an 710071, China.

Micromachines
|March 28, 2026
PubMed
Summary

This study introduces a new method to design monopulse phased arrays, enhancing their directivity for improved tracking and beam-scanning. The technique optimizes difference patterns (DPs) without changing the array

Keywords:
difference pattern (DP)directivity maximizationlow sidelobesmicrostrip patch antennamonopulse arrayplanar phased arrayradome-enclosed linear phased array

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Area of Science:

  • Microwave Engineering
  • Antenna Theory
  • Array Signal Processing

Background:

  • High-performance difference patterns (DPs) are essential for monopulse tracking and beam-scanning in microwave array systems.
  • Designing monopulse phased arrays with desired characteristics (steep slopes, high directivity, low sidelobes, symmetric main lobes) is challenging due to aperture and radome constraints.

Purpose of the Study:

  • To propose a novel design method for maximizing DP directivities in monopulse linear and planar phased arrays.
  • To address the challenges in synthesizing monopulse arrays with specific performance metrics.

Main Methods:

  • Formulating the DP synthesis as a nonconvex optimization problem for directivity maximization.
  • Decomposing the problem into a sequence of convex subproblems by fixing the DP slope reference phase and using Taylor expansion.
  • Leveraging the flexibility of the phased array feed network for directivity enhancement.

Main Results:

  • The proposed method effectively enhances DP directivities without altering the array's geometric configuration.
  • Demonstrated high directivity and symmetric main lobes in numerical examples of radome-enclosed linear and planar arrays, and a uniform planar array.

Conclusions:

  • The novel design method offers an efficient approach to monopulse array DP synthesis.
  • Achieves significant directivity improvements and symmetric main lobes, crucial for advanced microwave array applications.