Development of miniaturized dual-frequency FM transmitter

Fm Transmitter a Antenna

Frequency Modulation ( FM ) Tutorial

Lawrence Der, Ph.D. Silicon Laboratories Inc. Introduction Edwin H. Armstrong, known as one of the founding fathers of radio technology, invented the superheterodyne radio receiver in 1918 and frequency modulation (FM) in 1933 [1]. These two concepts, along with his regenerative circuit technique developed in 1912, formed the basis of radio frequency electronics as we know it today. In the Unit...

Development of 1-bit Digital Radio-Frequency Transmitter

1-1 Development background To cope with the recent rapid increase in communication traffic, various measures are being implemented for communication systems such as distributing traffic pathways using wireless LANs or other systems and increasing transmission capacity by introducing multiple-input/multiple-output (MIMO) technology or array antenna systems. The appearance of smartphones has acce...

Design Parameters of a Miniaturized Piezoelectric Underwater Acoustic Transmitter

PZT ceramics have been widely used in underwater acoustic transducers. However, literature available discussing the design parameters of a miniaturized PZT-based low-duty-cycle transmitter is very limited. This paper discusses some of the design parameters--the backing material, driving voltage, PZT material type, power consumption and the transducer length of a miniaturized acoustic fish tag u...

Miniaturized-Element Frequency Selective Surfaces

This article presents an overview of the progress made in the design of surface topology, fabrication, and applications of a new class of spatial filters known as miniaturized-element frequency selective surfaces (FSS’s) in recent years at the University of Michigan. The research in designing the new class was initiated with the demand for FSS’s with overall small dimensions for low frequency a...