The paper presents the method for measuring parameters (gain, antenna factor, impedance and radiation pattern) of small antennas in GTEM cell, which is a novel method and environment for antenna measurements. In order to investigate the suitability of GTEM cell for this kind of measurement, the measurement results for a biconical dipole, microstrip patch antennas and small loop antenna were com...

Retrodirective Phase-Lock Loop Controlled Phased Array Antenna for a Solar Power Satellite System. (December 2004) Samuel John Kokel, B.S., Texas A&M University Chair of Advisory Committee: Dr. Kai Chang This thesis proposes a novel technique using a phase-lock loop (PLL) style phase control loop to achieve retrodirective phased array antenna steering. This novel approach introduces the concept...

For frequencies below 30MHz, electromagnetic interference (EMI) measurements are performed by measuring magnetic field components using a loop antenna. The strength is given the voltages read an EMI receiver and antenna factor (MFAF) of To measure accurately, MFAF most important parameter. In this paper, basic characteristics antennas for described, especially its definition, height dependence ...

In order to reduce the size of a wireless system, we propose a design theory for the broadband impedance matching circuit which connects an electrically small antenna (ESA) to a semiconductor amplifier. We confirmed its validity for the case of connection between a small slot loop antenna with a small radiation resistance of Ra = 0.776Ω and a semiconductor amplifier with high input impedance of...

Frequency-swept input-impedance measurements to determine Q factors and field strengths for an electrically small tuned transmitting loop antenna in its operating environment have recently been made. These observational results are compared with numerical modeling by the computational electromagnetic code NEC-4D, since the validity of this code to simulate the performance of electrically small ...

A characteristic loop locus of dc power versus RF output power was observed as the frequency was varied around the optimum point of an operational active antenna. A new technique was introduced into the simulation, plotting the dependence of parameters such as supply current, efficiency or output power on internal impedance as seen by the naked transistor. It is now clear that the loop was form...

In this paper a special toroidal coordinate system is introduced in order to derive general solutions for the electric and magnetic fields from a toroidal antenna. These solutions depend on the current distribution on the toroid and are in integral forms. Some Fourier expansion techniques have been used in order to simplify these integral equations. The surface current is found under the assump...

ABSTRACT The paper presents design of a 2×2 multiple input multiple output (MIMO) LTE Downlink using OFDM with 16-QAM scheme, operated in a spatial Multiplexing (SM) mode. An urban Microcell Winner channel model is assumed to investigate the performance of the system. The focus of this paper is to understand the effect of antenna spacing of end transceivers on the performance of 2×2 MIMO LTE Do...

We compute the next-to-leading order (NLO) QCD corrections to gluon-fusion subprocess of diphoton-plus-jet production at LHC. fully differential distributions by combining two-loop virtual with one-loop real radiation using antenna subtraction cancel infrared divergences. observe significant NLO which demonstrate importance these quark-induced channel next-to-next-to-leading (NNLO).

Compact Circularly Polarized Slot-Ring Antenna and Microstrip Bandpass Filter Using Triangular Open-Loop Resonators. (December 2006) Muhammad Fahad Farooqui, B.E., NED University Chair of Advisory Committee: Dr. Kai Chang In this thesis two different research topics are undertaken, both in the area of compact RF/microwave circuits design. The first topic involves the design of a compact circula...