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Related Concept Videos

Mesh Analysis for AC Circuits01:12

Mesh Analysis for AC Circuits

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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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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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Updated: Apr 24, 2026

Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics
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A low-profile omnidirectional circularly polarized antenna using integrated patch and CRLH loop structures.

Jui-Han Tai1, Yu-Jen Chi2, Fu-Chiarng Chen1

  • 1Institute of Communications Engineering, National Yang Ming Chiao Tung University, Hsinchu City, 300093, Taiwan.

Scientific Reports
|April 22, 2026
PubMed
Summary

This study presents a novel low-profile antenna combining patch and loop designs for omnidirectional circular polarization. The antenna achieves excellent impedance matching and radiation characteristics at 2.4 GHz.

Keywords:
Circularly polarized antennaCommon-mode suppressionComposite right/left-handed transmission lineLow-profileMicrostrip balunOmnidirectional antenna

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Area of Science:

  • Electromagnetics and Microwave Engineering
  • Antenna Theory and Design
  • Wireless Communication Systems

Background:

  • Omnidirectional antennas are crucial for many wireless applications requiring 360-degree coverage.
  • Achieving circular polarization (CP) with omnidirectionality and a low profile presents significant design challenges.
  • Existing solutions often compromise on size, polarization purity, or radiation pattern.

Purpose of the Study:

  • To propose and validate a novel low-profile omnidirectional circularly polarized antenna.
  • To integrate patch and loop antenna functionalities for dual-polarization capabilities.
  • To achieve broadband performance with good impedance matching and axial ratio.

Main Methods:

  • Integration of a patch antenna for vertical polarization and a loop antenna with composite right/left-handed (CRLH) line segments for horizontal polarization.
  • Utilizing a microstrip balun for loop antenna feeding and a common-mode suppression filter to mitigate interference.
  • Employing an unequal Wilkinson power divider and transmission lines to control power ratio and phase for circular polarization generation.

Main Results:

  • Demonstrated good impedance matching at the center frequency of 2.4 GHz.
  • Achieved an axial ratio below 3 dB in the xy-plane and omnidirectionality of approximately 1 dB.
  • Measured results showed good agreement with simulations, validating the design's feasibility despite minor environmental degradation.

Conclusions:

  • The proposed integrated antenna design successfully achieves low-profile omnidirectional circular polarization.
  • The design offers a viable solution for applications requiring wide-angle coverage and polarization diversity.
  • The validated design contributes to advancements in compact antenna technology for wireless systems.