A printed log-periodic dipole antenna with balanced feed structure

Design a Compact Printed Log-Periodic Biconical Dipole Array Antenna for EMC Measurements

“…Calculating the antenna factor and comparing it with the standard result of the conventional LPDA antenna is a trusted investigation method to show the validity of the proposed design. For instance, an antenna factor (23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40)(41) dB/m for the proposed design is compared to the antenna factor (26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40)(41) dB/m for a commercial (0.7-6) GHz LPDA antenna (HyperLOG ® 7060). Moreover, more investigations could be performed on this antenna for future work, such as the calibration and modeling of an equivalent circuit.…”

“…The top microstrip line has a width w f 1 = 3.5 mm while the width of the bottom microstrip line is w f 2 = 5 mm, The 50 Ω impedance point is usually located near the narrow tip of the PLPDA antenna. To achieve impedance bandwidth less than −10 dB for all elements in the array, a parametric sweep has been performed to change the width of the transmission line by creating a balun to balance the surface currents distribution between the two sides of the transmission line as described in [28]. These optimum values are obtained with the help of CST Microwave studio to obtain wider impedance bandwidth starting from 0.5 GHz to 6 GHz.…”

“…Table 3 illustrates the design specifications for several proposed designs that have been presented to serve as a reference antenna for EMC measurements inside the chamber [27][28][29][30][31][32]. The bandwidth enhancements and the size reduction are the main goals for all these works as they are controlled by the number of dipole elements and the spacing factor.…”

“…Therefore, this antenna offered wide bandwidth starting from 800 MHz to 2.5 GHz with size reduction using only 12 dipoles. In [28], a PLPDA antenna with a balanced feed structure was presented. The authors modified the width of the feeding lines to compensate soldering effect and offer broadband impedance bandwidth starting from 500 MHz to 3 GHz.…”

Complete Design Procedure of a Size Constrained Printed Planar Log-periodic Dipole Antenna

“…It was found that W f = 3.7 mm was the best choice to match the 50 Ω coaxial cable. However, to have the same current on the top and bottom strips of the feed transmission line, the top strip width (W f t ) needs to be decreased to account for the loading effect of the coaxial cable [27,28]. The best balance for W f b = 3.7 mm is W f t = 2.2 mm, as shown in Fig.…”