Portfolio

My Portfolio

My Creative & Awesome Portfolio.

Proposing a multi-frequency broadband hybrid combining method to enhance antenna gain and cover expected ambient bands;
Designing high-gain (~8 dBi) 8-port dual-polarized fork-shaped patch antennas with compact area (~0.35λ × 0.35λ per port at 0.9 GHz);
Developing efficient single- and triple-band rectifiers using multi-stub microstrip matching to harvest energy from multiple wireless sources;
Demonstrating prototype performance with over 600 mV DC output and >50% rectification efficiency at RF input power < –25 dBm;
Validating a quad-band back-to-back RF harvester in both indoor and outdoor environments;

A “Y”-shaped antenna element is designed for ultra-wideband (UWB) operation, providing a high reflection phase response over a full 360 degrees.
A multilayer RA is introduced to solve the phase range or spatial delay problem of single-layer RA, where phase variation is provided by varying the resonance dimension of the unit element.
The antenna achieved a peak realized gain of 21.261 dBi with a 3 dB gain bandwidth (BW) of 18.2%, and a 3 dB axial ratio (AR) BW of 63.11% for transmit antenna (TA) operation.
RA can achieve not only the better BW and efficiency of 63%(fractional BW) and 54.75% but also the highest scanning range of ± 60◦ compared to all the reported works.

The frequency and phase shift of the reflectarray can be adjusted by tuning the capacitance (C) of varactor diodes, which ranges from 0.1 to 1.78 pF, corresponding to a bias voltage of 1 to 15 V.
This enables phase shifting without altering the patch size, across the frequency bands of 3–4 GHz, 5.5–6.75 GHz, and 7.5–8.25 GHz.
A 20×8 reflectarray was fabricated and measured using the NSI 2000 near-field (NF) system to verify beam steering performance, with control implemented via FPGA.
The reconfigurable array demonstrates beam steering capabilities at 0°, 15°, 30°, 45°, and 60°, making it a promising candidate for applications in microwave imaging, biomedical sensing, and wearable antennas.

Meta surface Array design using four pieces of metallic patches that are connected with Schottky diodes.
The unit cell produces two resonant frequency points at 49 − 4.63 GHz and 6.86 − 7.50 GHz.
The resultant absorptivity ranges from 4.49 − 4.63 GHz and 6.86 − 7.50 GHz are 60% and 95%, and with an FBW of 14% and 64%.
The achieved realized gain of 9×7 metasurface array at 4.5 and 7 GHz are 13 and 18.8 dBi, respectively.
Meta surfaces are promising candidates for the directionality of radiated power in far-field and near-field WPT systems (e.g., for biomedical implants).