Radiation Efficiency Limits in Direct Antenna Modulation Transmitters

Generalized Covering Groups and Direct Limits

SAR Measurement Procedure for Multi-antenna Transmitters

This paper proposes and verifies a SAR measurement procedure for a multi-antenna transmitter that requires the measurement of two-dimensional electric field distributions for the number of antennas and the calculation for obtaining the three-dimensional SAR distributions for arbitrary weighting coefficients of the antennas prior to determining the average SAR. The proposed procedure is verified...

Simulation and Measurements of Ultra-Wideband Antenna Radiation Efficiency

The present paper compares the simulated and measured radiation efficiency of a dielectrically loaded microstrip-fed Ultra-Wideband (UWB) monopole. The antenna was designed to operate inside a Universal Serial Bus (USB) dongle. Wideband efficiency measurements were conducted using the reverberation chamber technique and a cavity-based approach, called the source-stirred method. Both procedures ...

Distortion Issues in Direct Conversion Transmitters

In the wireless communication systems, due to the increasing demands for high data rate and high efficiency, several practical challenges arise in the design of directconversion trans-mitters. According to the existing literatures, power amplifier (PA) nonlinearity and local oscillator (LO) pulling are the most critical factors to deteriorate the transmit signal quality. In this work, the above...

High Efficiency CMOS Power Amplifiers for Drain Modulation Based RF Transmitters

I hereby declare that I am the sole author of this thesis. This is a true copy of the thesis, including any required final revisions, as accepted by my examiners. I understand that my thesis may be made electronically available to the public. Abstract The rapid evolution of wireless communication technologies increased the need for handheld devices that can support dissimilar standards or bette...