A low cost fractal CPW fed antenna for UWB applications with a circular radiating patch

• Published in: Telkomnika 2020-02, Vol.18 (1), p.436-440
• Main Authors: Hamdouni, Akram El, Tajmouati, Abdelali, Zbitou, Jamal, Bennis, Hamid, Errkik, Ahmed, El Abdellaoui, Larbi, Latrach, Mohamed
• Format: Article
• Language: English
• Subjects: Antennas; Bandwidths; Boolean algebra; Circularity; Coplanar waveguides; Engineering research; Federal agencies; Fiberglass; Fractal geometry; Fractals; Frequencies; Frequency ranges; Geometry; Glass fiber reinforced plastics; Glass-epoxy composites; Impedance matching; Input impedance; Microstrip antennas; Microwave transmission; Planes; Propagation; Simulation; Solvers; Spectrum allocation; Substrates; Transmission lines; Ultrawideband; Wireless networks
• ISSN: 1693-6930; 2302-9293
• DOI: 10.12928/telkomnika.v18i1.12666

The proposed CPW fractal antenna has been configured to operate in the frequency range 3.1-10.6 GHz published by the federal communications commission (FCC) as an ultra-wide band (UWB). In the planar technology, the microtrip feed line remains the most popular technique to establish the microwave transmission due to several advantages, however this method suffers from some limitations mainly belong to the reduced bandwidth offered. [...]the introduction of the coplanar waveguide (CPW) technique becomes mandatory in the planar devices and especially in the printed antennas, by depositing the transmission feed line between two narrow ground planes on the top side of the substrate, which offers to the antenna a wider signal spectrum, a less dispersion, low radiation loss, an ease integration with passive and active circuits [6-8]. 2.ANTENNA GEOMETRY The CPW technique has been applied to the proposed antenna by designing the transmission line and the ground planes on the top side of the substrate, the radiating patch has been circularly chosen with a fractal geometry obtained by the merging of rectangular and circular shapes by using the Boolean add included in the CST solver as shown in Figure 1.The overall dimensions of the achieved antenna is 43x34 mm2 which are the dimensions of the FR-4 of Epoxy fiberglass used as substrate with the following features; a thickness of h=1.6 mm, a permittivity constant er = 4.4 and a loss tangent tan(5) = 0.025. The return loss has been computed by the two solvers CST and ADS and presented in the Figure 4 with the measured one, a good agreement between the three graphs appeared in term of input impedance matching in a bandwidth of 120% from 2.99 GHz to 12 GHz which include the FCC band 3.1-10.6 GHz [18-28].