Abstract-A modified technique to design directional ultra-wideband (UWB) antenna with slotted ground structure approach on the ground plane has been presented for applications in C-and X-bands. Initially, elliptical slot is inserted into ground and thereafter, the axis of ellipse is rotated 45 degrees in direction of the substrate. Minor axis of the ellipse is optimized to locate it symmetrically around the circular patch in order to obtain the full C-and X-band operations and also to enhance directivity. Thereafter, for further improvement in the directivity as well as gain, an elliptical slot in circular patch has also been introduced. The impedance bandwidth approximates about 95% covering the frequency ranging from 4.18-11.50 GHz. The return losses (S 11 ) are −38 dB and −43 dB through simulation, which are −24 dB and −32 dB by measurement at 6.3 GHz, 9.3 GHz resonant frequencies, respectively. Simulated gain and half power beam width (HPBW) are 2.5-8.4 dB and 49-22 degrees in 4.18-11.50 GHz band, respectively. Gain and half power beam width (HPBW) of the proposed antenna improves by 1-2 dB and 5-10 degrees, respectively compared with previously designed antennas. Simulation of the antenna has been carried out on Computer Simulation Technology (CST) software on an FR-4 substrate having dielectric constant 4.3 of thickness 1.6 mm. The measured results show good agreement with equivalent circuit model and CST simulation.

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The receiving antenna is critical in an RF energy harvesting system because it collects energy from nearby radiating sources. The amount of harvestable energy is influenced by antenna characteristics such as gain, radiation pattern, and impedance bandwidth; therefore, choosing the correct receiving antenna is crucial. The microstrip patch antenna is a popular choice because of its low profile, low cost, and ease of manufacture. Many publications on microstrip patch antennas have been written over the years for various applications, such as mobile communications, radio frequency identification (RFID) and medical telemetry. We provide a folded shorted patch antenna for indoor mobile communication systems in this research. In recent years, there has been a lot of new work in the field of microstrip antennas, and it is one of the most active sectors in business communications. Mobile communications, wireless interconnects, wireless local area networks (WLANs), and cellular phone technologies are among the most rapidly increasing industrial areas today. A microstrip antenna is a popular option due to its light-weight, compact volume, low production cost, and ability to operate at dual and triple frequencies. Microstrip antennas, on the other hand, suffer from a number of disadvantages. A fundamental disadvantage of microstrip patch antennas is their small bandwidth.