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Polar Coordinates: Problem Solving

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...

Polar Coordinate System

Polar Coordinate System

The polar coordinate system provides a natural way to describe points in the plane when distances and directions are more meaningful than horizontal and vertical displacements. It is especially useful for modeling non-rectangular regions such as circles and spirals, where symmetry about a center point is easier to express than it is in a rectangular grid. A familiar example is a ship’s plan position indicator, which marks detected targets as dots positioned relative to the ship at the display’s...

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Related Experiment Video

Updated: Jun 24, 2026

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

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

Published on: May 1, 2018

Noninvasive biosignal detection radar system using circular polarization.

Jee-Hoon Lee¹, Jung Man Hwang, Dong Hyuk Choi

¹Korea Advanced Institute of Science andTechnology (KAIST), Daejeon 305-701, Korea. jhlee99@kaist.ac.kr

IEEE Transactions on Information Technology in Biomedicine : a Publication of the IEEE Engineering in Medicine and Biology Society

|April 17, 2009

Summary

This summary is machine-generated.

This study introduces a hypersensitive Doppler radar system utilizing circular polarization for improved detection. The system noninvasively measures vital biosignals like respiration and heart rates using advanced radar technology.

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Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System

Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System

Published on: June 13, 2010

Area of Science:

Electromagnetics and Signal Processing
Biomedical Engineering
Radar Systems

Background:

Doppler radar systems are crucial for detecting motion.
Improving the sensitivity and accuracy of radar detection is an ongoing challenge.
Noninvasive biosignal monitoring requires precise and reliable sensing technologies.

Purpose of the Study:

To propose an integrated hypersensitive Doppler radar system.
To enhance the detecting property of the system using circular polarization characteristics.
To enable noninvasive sensing of vital biosignals such as respiration and heart rates.

Main Methods:

Utilizing a circular polarization characteristic in the Doppler radar system.
Employing antennas with reverse polarization based on the principle of reverse sense of rotation for a perfectly conducting reflecting surface.
Developing a bistatic radar system operating in the X-band with a compact size (95 x50 x13 mm³).

Main Results:

Demonstrated effective improvement in the detecting property of the radar system.
Successfully achieved noninvasive sensing of biosignals through periodic skin and muscle movements.
Validated the system's capability in measuring respiration and heart rates.

Conclusions:

The proposed integrated hypersensitive Doppler radar system offers enhanced detection capabilities.
The use of circular polarization and reverse polarization antennas is effective for improving radar performance.
The system shows significant potential for noninvasive monitoring of physiological parameters.