Broadband Planar Dipole Array Antenna with Double C-Shaped Slit Elements for Digital TV Broadcasting Transmission

摘要

This research has proposed a planar rectangular dipole antenna enclosed inrndouble C-shaped parasitically slit elements (i.e., radiator element) on a double-corneredrnreflector for bandwidth enhancement. In the study, simulations were first carried out torndetermine the optimal parameters of the radiator element and then a radiator element prototypernwas fabricated and mounted onto a double-cornered aluminum reflector. The simulatedrnand measured ∣S_(11)∣<–10 dB of the antenna element covered the frequency ranges ofrn451–901 MHz (66.6%) and 455–886 MHz (64.3%), respectively. The gain was enhanced byrnthe subsequent deployment of multiple radiator elements to fabricate a four-element verticallyrnarray antenna on an elongated double-cornered reflector. The simulated and measuredrn∣S_(11)|<-10 dB of the array antenna, respectively, covered the 410–991 MHz (82.9%) andrn415–886 MHz (72.4%) frequency ranges. The proposed array antenna radiates unidirectionallyrnacross the DTV frequency band with a measured front-to-back ratio and cross polarizationrn>20 and <-23 dB, respectively. The simulated and measured half-power beam widthsrnin the E and H planes were respectively 56°±13° and 20°±6°; and 57°±13° and 21°±6°.rnIn addition, the simulated and measured gains of the array antenna were 12.8–16.4 dBi andrn11.3–15.8 dBi along the 470–862 MHz frequency range. This proposed array antenna isrnthus suitable for DTV broadcasting transmission.