Circular Waveguide Array Antenna for RF Energy Harvesting Applications

• Main Author: Panji Kusuma Praja, Muhammad
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/36084
• Institution: Institut Teknologi Bandung

In this study research, simulation and realization of a 2 × 2 array circular waveguide antenna for the application of RF energy harvesting. The waveguide has TM 01 mode with cut-off specifications at a frequency of 1600 MHz which is designed to work at a frequency of 1800 MHz - 1900 MHz. The material used to make a waveguide antenna is copper material which has a thickness of 0.5 mm and is arranged on an Epoxy FR-4 dielectric substrate with a thickness of 1.6 mm. Supplying by a 50 ? SMA connector and distributed to each waveguide with a microstripline printed under the dielectric substrate. In the initial stage a circular waveguide was designed with optimum results at a frequency of 1.85 GHz with a ???????????? value of -26.55 dB. 2 x 2 array circular waveguide antenna is designed to produce a ????????????-13.52 dB value at a frequency of 1.85 GHz. By optimizing the shifting of 15 mm waveguide antenna position a reflection coefficient value of -34.4 dB was obtained at a frequency of 1.85 GHz. At the realization stage, the 2 × 2 array circular waveguide gets the best ???????????? value of -30.32 dB at the frequency of 1.84 GHz. For the resulting VSWR value of 1.12 on the 1.85 GHz frequency and the gain measured at the frequency of 1.85 GHz is equal to -8.24 dBi. The rectifier circuit and voltage multiplier are pinned to the final stage of the circuit for this energy harvesting. The voltage multiplier circuit uses a five stage voltage multiplier which is expected to provide a considerable output voltage from the process of energy harvesting. But at the measurement, there has not been seen a strengthening of the output voltage of 0.22 Volt for a 0.2 Volt input value