Dit proefschrift is goedgekeurd door de promotoren: Summary 125 Samenvatting 127 List of publications 129 Dankwoord 131 Chapter 1 Introduction 1.1 RF CMOS The use of mobile wireless communication systems is rapidly increasing. Electronics involved in these systems are typically referred to as RF electronics. RF stands for radio frequencies, a term covering all frequencies of the electromagnetic...

Currently, high crystalline quality materials such as carbon nanotubes (CNTs) are produced only at a temperature in an excess of 500 C. This paper reports on low-temperature synthesis of CNTs by selective heating of catalytic particles using two complementary mechanisms: enhanced exothermic catalytic reactions and inductive heating by radio frequency electromagnetic fields.

Radio Frequency Micro-Electro-Mechanical-Systems (RF MEMS) based switches are expected to play a key role in the field of microwave switching. Traits like low-loss performance; zero-power consumption and very low inter-modulation distortion have made these switches well suitable for high-performance microwave and millimeter-wave circuits. The design of RF MEMS switches, however, require sophist...

When the Earth’s ionosphere is irradiated by a radiofrequency (RF) electromagnetic wave of sufficiently high power density and tuned to match a natural Eor F-region plasma frequency, ionospheric magnetoionic wave modes may be excited and may generate RF electromagnetic sideband waves via nonlinear interactions. These secondary emissions, which may then escape from the ionosphere, have been term...

This paper introduces the concept of visible light communication (VLC). The urgent need of VLC is to overcome the problems faced in RF communication. Unlike existing methods of wireless communication, the visible light portion of the electromagnetic frequency spectrum is used in VLC to transmit information. This is similar to established forms of wireless communication such as Wi-Fi which uses ...

In software defined radio systems, placing the analog-todigital converter (ADC) near the antenna part in the block diagram of the receiver is desired to improve the flexibility of the system. The radio frequency (RF) sampling method, in which the received signal is sampled at the RF stage, realizes such structure. The undersampling is a potential method to sample the RF signal using the existin...

The Doppler effect has well-established applications in astronomy, medicine, radar and metrology. Recently, a number of experimental demonstrations of the inverse Doppler effect have begun to appear. However, the inverse Doppler effect has never been observed on an electronically reconfigurable system with an external electromagnetic wave source at radio frequencies (RF) in experiment. Here we ...

Introduction: The fast-growing telecommunication and wireless technologies has led to more dependence to these communication devices and higher levels of exposure to electromagnetic radiations propagated by cellular devices and their service towers. To disable signaling in places where silence is valued or where information quarantine measures are required, mobile phone jammers emit radiofreque...