Controllable Backscatter Development

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Supervisor:
Rösner Vilmos
Department of Broadband Infocommunications and Electromagnetic Theory

This is the abstract of my thesis ’Controllable Backscatter Development’.

What is a Backscatter? In physics backscattering phenomenon is described as follows: Backscattering is the reflection of waves, particles, or signals back to the direction from which they came.

The main goal of my thesis was to design and realise a digitally controllable Backscatter circuit for the S-band radar, which was developed and manufactured in the Radar Research Group of the BME University, the same way as my Backscatter.

The first part of my thesis is a short introduction to the radar theory and the highly essential concepts inevitable to understand the basic different theory of operations of the Backscatters. The design considerations begin with the estimation of the necessery transmission (S21) between the Backscatter RFin and RFout ports for the different desired RCS (radar cross section) simulation.

Before I choose on which basic principle should my Backscatter rely on, I outline the different basic theory of operations of the Backscatters so as to help the Reader to have a deeper understanding on each type, especially regarding the minimum step of the simulated speed resolution, and what exactly the limiting factors are.

Later on I examine the benefits of the hardware compared to the mechanical concept based Backscatter, and present the thorough operation of the hardware, particularly the important aspects on the circuit design, PCB routing, and layout design.

In the final practical stage of my thesis I took some measurements with Rohde-Schwarz spectrum analiser, Agilent signal generator and the S-band radar, all of which was at my disposal at the Radar Research Laboratory.

In the final section of my thesis I draw the conclusion of the measurements, sum up the job I have done, and give my ideas how the Backscatter can be developed further.

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