Abstract
A full-band digital television (DTV) transmitting antenna array with dual-layer bowtie dipole unit is proposed in this paper. The dual-layer bowtie dipole is utilized as the antenna unit to broaden the frequency bandwidth, and its key parameters are discussed. Besides, a wideband impedance matching network with stepped complex impedance transformers is designed to achieve the full-band low voltage standing wave ratio (VSWR). For verification, a prototype is designed, fabricated, and measured. The experimental results agree well with the simulations. The measurement shows a relative bandwidth of 62.4% (455 MHz - 868 MHz) under the criterion of VSWR <; 1.15. Particularly, the VSWR is less than 1.13 within the range of 470 MHz - 862 MHz, (i.e. the full band of the DTV transmitting system). And the proposed antenna maintains a stable gain larger than 11.6 dBi over the operating frequency band with the half-power beam width of $70^{\circ } \pm ~3^{\circ }$ in the horizontal plane, which meets the requirements of the full-band signal transmission in the DTV broadcasting system.
Highlights
Digital television (DTV) broadcasting has mostly replaced the conventional analog TV broadcasting due to the advantage of high frequency spectrum utilization and multichannel operation modes [1], [2]
A series of standards for DTV broadcasting based on the operating band of 470 MHz - 862 MHz were widely adopted by the most of Europe and Asia, such as terrestrial digital video broadcasting (DVB-T), DVB-T2, and digital television terrestrial multimedia broadcasting (DTMB) [3], [4]
As an essential device of DTV transmission system, the transmitting antenna requires the characteristics of broadband, high gain, high power capacity and low voltage standing wave ratio (VSWR), so as to improve the frequency utilization, widen the coverage range, and protect the output stage amplifier from damage [5], [6]
Summary
Digital television (DTV) broadcasting has mostly replaced the conventional analog TV broadcasting due to the advantage of high frequency spectrum utilization and multichannel operation modes [1], [2]. As an essential device of DTV transmission system, the transmitting antenna requires the characteristics of broadband, high gain, high power capacity and low voltage standing wave ratio (VSWR), so as to improve the frequency utilization, widen the coverage range, and protect the output stage amplifier from damage [5], [6]. Since simple feeding structures are employed, these wideband antennas with high gains are widely applied in the early DTV system. To obtain the VSWR less than 1.15, a balance to unbalance feeding structure [12] is utilized to achieve the relative bandwidth of 40%. The VSWR can maintain lower than 1.15 over the frequency range from 544 MHz to 653 MHz. the peak gain of 9.23 dBi is inferior to the aforementioned methods, and the microstrip structure cannot suffer from high transmitting power. Several antennas with different operating frequencies are needed to cover the full band of 470 MHz – 862 MHz, which results in a higher cost
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