Abstract
A miniaturized wideband loop antenna for terrestrial digital television (DTV) and ultra-high definition (UHD) TV applications is proposed. The original wideband loop antenna consists of a square loop, two circular sectors to connect the loop with central feed points, and a 75 ohm coplanar waveguide (CPW) feed line inserted in the lower circular sector. The straight side of the square loop is replaced with a multiple half-circular-ring-based loop structure. Horizontal slits are appended to the two circular sectors in order to further reduce the antenna size. A tapered CPW feed line is also employed in order to improve impedance matching. The experiment results show that the proposed miniaturized loop antenna operates in the 460.7–806.2 MHz frequency band for a voltage standing wave ratio less than two, which fully covers the DTV and UHD TV bands (470–771 MHz). The proposed miniaturized wideband loop antenna has a length reduction of 21.43%, compared to the original loop antenna.
Highlights
Terrestrial digital television (DTV) and ultra-high definition (UHD) TVDigital television (DTV) broadcasting has become widespread, replacing conventional analog TV broadcasting due to such advantages as a high transmission rate with high spectrum efficiency, multi-channel operation, and high picture quality
A square loop appended with multiple half-circular rings and two circular sectors with horizontal slits are printed on one side of an FR4 substrate
For impedance matching in the entire band, the width of the central signal line of the coplanar waveguide (CPW) feed line in the middle of the lower circular sector is linearly tapered from wf to wc, and the length of this part is denoted l1, whereas l2 is the distance between the end of the tapered center signal line and the upper circular sector, with its width maintained as wc
Summary
Digital television (DTV) broadcasting has become widespread, replacing conventional analog TV broadcasting due to such advantages as a high transmission rate with high spectrum efficiency, multi-channel operation, and high picture quality. An unbalanced slot-printed dipole antenna with a triangular parasitic element for a DTV receiver was proposed with a size of 250 mm × 135 mm [13] It covered 441–890 MHz with peak gain of 4.7 dBi. A planar monopole antenna with a gap sleeve was developed to operate in the 432–827 MHz frequency band with peak gain of 2.2 dBi and a 213 mm × 40 mm antenna size [14]. For DTV transmitting antennas, a unidirectional 1 × 4 circular bow-tie dipole array antenna with incision gaps on top of a square ground plane was proposed [26] It covered the 450–1014 MHz frequency band with gain of 13.4–16.1 dBi in the frequency range of. CST Studio Suite (Dassault Systèmes Co., Vélizy-Villacoublay, France) [28]
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