4/21/2017

The First Real-Time Testbed for Massive MIMO from Lund University

Another great job in Massive MIMO studies, they built a Massive MIMO system which includes 100 BS antennas and 50 FPGAs.
Massive MIMO system - image from the paper:
 The World’s First Real-Time Testbed for Massive MIMO: Design, Implementation, and Validation


You can find this paper in following link @axiv.org: https://arxiv.org/pdf/1701.01161.pdf

4/19/2017

Temprature Sensor and MCU - PC UART Communication

Following implementation of the sensors includes communication link over UART between the computer and the microcontroller and there is also a GUI for the PC so as to demonstrate and track the temperature. I improved this system for 3 sensors and implemented into same MCU, however, I am now able to share it now.


More info:
https://e2e.ti.com/group/launchyourdesign/m/msp430microcontrollerprojects/618210

There is a serial chart application which is also interesting.
https://code.google.com/archive/p/serialchart/

4/18/2017

Graphene-based Antennas for Terahertz



A comprehensive review`Graphene-based Antennas for Terahertz Systems: A Review` is published by Diego Correas-Serrano* and J. Sebastian Gomez-Diaz* to explore the recent advancements and propose new research areas in Graphene application. It is a remarkable research, must be read by everyone who is interested in Graphene applications in electromagnetics and antennas.

* (Department of Electrical and Computer Engineering, University of California, Davis, Davis, California)

4/04/2017

Radiation Efficiency Issues in Planar (Patch) Antennas on Electrically Thick Substrates and Solutions

I found a really interesting study on radiation efficiency of patch antennas. They analyzed the trade-off between radiation efficiency and other antenna properties and have proposed solutions for this problem.


Abstract:
The paper addresses the problem of the radiation efficiency of planar antennas on electrically thick substrates. First, the non-monotonic dependency of the radiation efficiency of an infinitesimal horizontal electric dipole on grounded and ungrounded substrates versus the substrate electrical thickness is analyzed. Next, the phenomenology of the observed radiation efficiency is explained with the help of a novel substrate dipole approach, which reduces the actual structure to an equivalent source dipole composed of the original dipole and the substrate dipole radiating into free space. Finally, two solutions for enhancing the efficiency at electrical thicknesses where the efficiency is minimal are studied.

Link to article http://ieeexplore.ieee.org/document/6507325/