This paper presents an omnidirectional antenna using stacked curve dipoles radiating horizontal polarization for digital television (DTV) reception. The proposed antenna consists of stacked curve dipoles designed on brass sheet. The parametric study is carried out for various dimensions of curve dipoles to improve the impedance bandwidth. The results show good impedance matching for
Nowadays, television broadcasting services have switched from analog system to digital television (DTV) system. The DTV technology enables TV broadcasters to transmit high-definition (HD) image and audio signals [
This paper proposes a horizontally polarized antenna for DTV reception, as shown in Figure
Configuration of the proposed antenna: (a) top view and (b) side view.
The initial antenna structure consists of the five elements of curve dipoles arranged to form the circular configuration. Two curved dipoles are stacked between each other in opposite directions with an air gap in between them. The feeding structure is located between the top and bottom layers as shown in Figure
Configuration of the stacked curve dipoles (5 elements): (a) top view and (b) side view.
The initial antenna parameter is the outer radius of curve dipole
From Figure
From Figure
Simulated results for different radii of feeding structure (
Simulated results for different spacing between stacked curve dipoles (
When the radius of the feeding structure
From Figure
Simulated results for different outer and inner radii of curve dipoles (
From Figure
Simulated results for different radii of the branch curve
From the parametric study of the antenna with five elements and branch curve structure, the |
Designed parameters of the proposed antenna.
Parameter | Description | Size |
---|---|---|
|
Outer radius of curve dipole | 190 mm |
|
Inner radius of curve dipole | 180 mm |
|
Width of dipole arm | 2 mm |
|
Spacing between stacked curve dipoles | 6 mm |
|
Thickness of brass sheet | 1 mm |
|
Angle of curve dipole | 37 deg |
|
Radius of feeding structure | 24 mm |
|
Radius of branch curve | 186 mm |
|
Angle of branch curve | 24 deg |
To validate the simulated results, the prototype antenna was fabricated as depicted in Figure
Photograph of the proposed prototype antenna: (a) top view and (b) bottom view.
Simulated and measured |
Simulated and measured gains of the proposed antenna.
Figure
Simulated and measured radiation patterns (a) 470 MHz, (b) 666 MHz, and (c) 862 MHz.
An omnidirectional antenna using stacked curve dipoles radiating horizontal polarization has been proposed for digital terrestrial TV reception. The measured results show that good impedance matching for |
The authors declare that there is no conflict of interests regarding the publication of this paper.
This work has been supported by the Thailand Research Fund through the TRF Senior Research Scholar Program under Grant no. RTA5780010.