Profilbillede af WaleedAhmad145
@WaleedAhmad145
Member since 2. december 2016
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WaleedAhmad145

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I am an RF engineer and has been working on antennas, RF and Microwave circuits design projects for last 3 years. I have my expertise in following: Patch antennas, Planar Inverted F Antenna, 5G Antennas, Miniaturized antennas, Wideband Antennas, Wearable Antennas, transmission line designs, lens antennas design, Electromagnetic bandgap structures, Frequency Selective Surfaces, Matching network design. I would like to complete your project with unlimited revisions. Thanks.
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Portfolio

Nylige bedømmelser

Erfaring

Research Engineer

Aug 2015 - Dec 2016 (1 year)

I am working as Research Engineer in an academic institution. I have been using HFSS and ADS for RF circuits and antenna design for 2 years. I have hands on experience on Network analyzer, Spectrum Analyzer and LPKF Protomat. I have completed funded research projects related to RF electronics and antennas.

Uddannelse

BS Electrical Engineering

2011 - 2015 (4 years)

Publikationer

Small form factor PIFA antenna design at 28 GHz for 5G applications

This paper presents the design and analysis of lowest form factor planar inverted-F Antenna at 28GHz for 5G Mobile applications.. The Important properties of this antenna are its small footprint (0.25λg), good gain of 4.5dBi, 10dB impedance bandwidth of 1.55 GHz and radiation efficiency of 94%. The total size of the PIFA antenna is 0.25λg. PIFA antenna is one of the antennas whose performance greatly depends on ground plane size and its position on the ground plane.

Small form factor dual band PIFA antenna design at 28/38 GHz for 5G applications

This Publication is about Dual band PIFA antennas at 28/38 GHz.

A Highly Efficient Tri-Band Rectifier For Various Radio Frequency Harvesting Applications

This work focuses on the development of a highly efficient and low threshold tri band rectifier that can harvest DC power from ambient RF signals of GSM1800, WiFi2400 and WiFi5000 A single stage voltage multiplier rectifying topology is used. SMS-7630 schottky diode by Skyworks is used as rectifying element due to its low threshold voltage.

Low Cost Packaging Solution For RF Energy Harvesting Rectifiers

This work presents the comparison of RF to DC conversion efficiencies and insertion loss of a dual band (2.45GHz and 5.8GHz) rectifier on Roger’s Duriod 5880, FR408hr by Isola Group and standard FR4. The rectifier chosen for comparison has a transmission line based impedance matching network. The circuit is simulated on Keysight Advance Design System (ADS) and realized on 1.6mm thick substrates. Measurements are in excellent agreement to the simulated results.

Highly Efficient Dual Band Rectifier for RF Energy Harvesting Applications in ISM Band

A highly efficient single branch dual-band rectifier operating at 2.45GHz and 5.8 GHz for various Radio Frequency (RF) Energy harvesting applications is presented. The circuit consists of a voltage doubler, an impedance matching network, and a load resistor. The diode used for rectification is SMS-7630 by Skyworks and its selection has been justified by a comparative study of diodes. An extremely low loss microstrip line based dual band impedance transformer is used for impedance matching.

Radio Frequency Energy Harvesting From Ambient FM Signals for Making Battery-Less Sensor Nodes

This paper presents an efficient rectifier for Radio Frequency (RF) energy harvesting applications in FM band (88MHz to 108MHz). The proposed rectifier is based on Modified Greinacher Rectification topology. The circuit is designed on Keysight Advance Design System (ADS) and realized on a 1.6mm thick FR4 sheet with 35um of copper cladding.

Ultra-Wideband End-fire Quasi-Yagi Antenna for High Resolution Automotive Radar Applications

In this work, we propose an ultra-wideband end-fire quasi-yagi antenna which simultaneously could be used for 5G communications and automotive radar applications. The proposed antenna covers an ultra-wide frequency range of 24.8 GHz (from 23.8 GHz to 48.6 GHz) by attaining a fractional bandwidth of more than 68%. The gain of the antenna ranges from 4.37 - 5.95 dBi. An excellent radiation efficiency of more than 97% is also achieved.

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