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Related Concept Videos

Polar Coordinates: Problem Solving01:27

Polar Coordinates: Problem Solving

Directional radiation patterns are central to antenna analysis, as they illustrate how signal strength varies with direction. These patterns are often modeled using polar plots, where the radial distance from the origin represents signal intensity at a given angle. A commonly used idealized form is the four-lobed rose curve, which captures the concept of directional beams in a simplified mathematical form.The four-lobed rose curve, described by r = cos⁡(2θ), features four symmetric lobes, each...
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Vector Functions and Motion: Problem Solving

Accurate position tracking is fundamental to the safe and effective operation of unmanned aerial vehicles (UAVs), particularly during precision maneuvers near complex structures. In this scenario, a drone is programmed to perform a high-precision inspection of a vertical structure, starting at position ((x, y, z) = (3, 0, 0)), with an initial velocity oriented in the positive z-direction. The trajectory of the drone is governed by a time-dependent acceleration function a(t), which is predefined...
Azimuths and Bearings01:19

Azimuths and Bearings

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Non-uniform Circular Motion01:22

Non-uniform Circular Motion

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Related Experiment Video

Updated: Jul 7, 2026

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar
07:14

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar

Published on: May 1, 2018

Dynamic null steering in an ultrawideband time-steered array antenna.

M Y Frankel, R D Esman

    Applied Optics
    |February 21, 2008
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel method for creating wideband nulls in ultrawideband antenna patterns without beam squint. The technique utilizes optical dispersive prisms for precise signal timing, enabling independent steering of nulls for enhanced antenna performance.

    Related Experiment Videos

    Last Updated: Jul 7, 2026

    Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar
    07:14

    Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar

    Published on: May 1, 2018

    Area of Science:

    • Antenna Theory and Design
    • Optical Signal Processing
    • Microwave Engineering

    Background:

    • Ultrawideband (UWB) array antennas require precise beamforming for optimal performance.
    • Achieving wideband, squint-free nulls in antenna patterns presents a significant engineering challenge.
    • Existing methods for null steering often lack flexibility and can distort the main beam.

    Purpose of the Study:

    • To develop a novel method for generating squint-free wideband nulls in UWB array antenna patterns.
    • To enable independent steering of these nulls without compromising the main beam's integrity.
    • To demonstrate the applicability of the technique for sidelobe nulling and jammer suppression.

    Main Methods:

    • Utilizing an optical dispersive-prism beam former to introduce time-delayed microwave signals to array elements.
    • Employing amplitude-modulated optical carriers propagated through optical links with position-dependent dispersion.
    • Controlling the delay gradient via optical carrier wavelength tuning.
    • Using a dispersive-prism tapped delay-line microwave filter for nulling signal frequency shaping.

    Main Results:

    • Successfully formed squint-free wideband nulls in the antenna pattern.
    • Demonstrated independent steering of nulls without significant main beam distortion.
    • Validated the technique for sidelobe nulling in transmitters and jammer suppression in receivers.

    Conclusions:

    • The optical dispersive-prism beam former offers an effective solution for creating steerable, wideband nulls in UWB antennas.
    • This method enhances antenna functionality by allowing targeted interference mitigation.
    • The technique shows promise for improving signal clarity in both transmission and reception systems.