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Clipper Circuit01:18

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A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
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Miniaturized Wideband Loop Antenna Using a Multiple Half-Circular-Ring-Based Loop Structure and Horizontal Slits for

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  • 1School of ICT Convergence, Daegu University, 201 Daegudae-ro, Gyeongsan, Gyeongbuk 38453, Korea.

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A new miniaturized wideband loop antenna is developed for digital television (DTV) and ultra-high definition (UHD) TV. This antenna achieves a 21.43% size reduction while maintaining performance for DTV and UHD broadcasting.

Keywords:
digital televisionhalf-circular ringshorizontal slitsminiaturizedwideband loop antenna

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Antenna Theory

Background:

  • Wideband loop antennas are crucial for modern television broadcasting.
  • Existing designs face challenges in miniaturization while maintaining performance.
  • Terrestrial digital television (DTV) and ultra-high definition (UHD) TV require antennas operating within specific frequency bands.

Purpose of the Study:

  • To propose and validate a miniaturized wideband loop antenna for DTV and UHD TV applications.
  • To achieve significant size reduction compared to conventional loop antennas.
  • To ensure the antenna operates effectively across the required DTV and UHD frequency spectrum.

Main Methods:

  • Modified the original square loop antenna by replacing straight sides with a multiple half-circular-ring structure.
  • Incorporated horizontal slits into circular sectors to further decrease antenna dimensions.
  • Utilized a tapered coplanar waveguide (CPW) feed line for enhanced impedance matching.
  • Conducted experiments to measure the antenna's operating frequency band and voltage standing wave ratio (VSWR).

Main Results:

  • The proposed antenna operates in the 460.7-806.2 MHz frequency band with a VSWR less than two.
  • This frequency range fully encompasses the DTV and UHD TV bands (470-771 MHz).
  • Achieved a 21.43% reduction in antenna length compared to the original design.

Conclusions:

  • The miniaturized wideband loop antenna effectively meets the requirements for DTV and UHD TV reception.
  • The design modifications successfully reduced antenna size without compromising operational bandwidth or performance.
  • This development offers a more compact solution for terrestrial television broadcasting applications.