Miniaturized Wideband Loop Antenna Using a Multiple Half-Circular-Ring-Based Loop Structure and Horizontal Slits for...

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.