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TiTLE : Dielectric Materials for Wireless Communication

AUTHOR : Mailadil T. Sebastian

PUBLISHER : Elsevier Science

iSBN : 0080453309 MAKER : Team DDU

PAGES : 688 Pages PACKAGER : Team DDU

EDiTiON : August 8, 2008 SUPPLiER : Team DDU

LANGUAGE : ENGLISH FORMAT : PDF

RLS DATE : 12/19/08 SiZE : 14.8 MB

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[Product Information]

Microwave dielectric materials play a key role in our global
society with a wide range of applications, from terrestrial and
satellite communication including software radio, GPS, and DBS TV
to environmental monitoring via satellite.

A small ceramic component made from a dielectric material is
fundamental to the operation of filters and oscillators in several
microwave systems. In microwave communications, dielectric
resonator filters are used to discriminate between wanted and
unwanted signal frequencies in the transmitted and received signal.
When the wanted frequency is extracted and detected, it is
necessary to maintain a strong signal. For clarity it is also
critical that the wanted signal frequencies are not affected by
seasonal temperature changes. In order to meet the specifications
of current and future systems, improved or new microwave components
based on dedicated dielectric materials and new designs are
required. The recent progress in microwave telecommunication,
satellite broadcasting and intelligent transport systems (ITS) has
resulted in an increased demand for Dielectric Resonators (DRs).
With the recent revolution in mobile phone and satellite
communication systems using microwaves as the propagation media,
the research and development in the field of device miniaturization
has been a major challenge in contemporary Materials Science. In a
mobile phone communication, the message is sent from a phone to the
nearest base station, and then on via a series of base stations to
the other phone. At the heart of each base station is the
combiner/filter unit which has the job of receiving the messages,
keeping them separate, amplifying the signals and sending then onto
the next base station. For such a microwave circuit to work, part
of it needs to resonate at the specific working frequency. The
frequency determining component (resonator) used in such a high
frequency device must satisfy certain criteria. The three important
characteristics required for a dielectric resonator are (a) a high
dielectric constant which facilitates miniaturization (b) a high
quality factor (Qxf) which improves the signal-to-noise ratio, (c)
a low temperature coefficient of the resonant frequency which
determines the stability of the transmitted frequency.

During the past 25 years scientists the world over have developed a
large number of new materials (about 3000) or improved the
properties of known materials. About 5000 papers have been
published and more than 1000 patents filed in the area of
dielectric resonators and related technologies. This book brings
the data and science of these several useful materials together,
which will be of immense benefit to researchers and engineers the
world over.

The topics covered in the book includes factors affecting the
dielectric properties, measurement of dielectric properties,
important low loss dielectric material systems such as perovskites,
tungsten bronze type materials, materials in BaO-
TiO<SUB>2</SUB> system,
(Zr,Sn)TiO<SUB>4</SUB>, alumina, rutile,
A<SUB>n</SUB>B<SUB>n-
1</SUB>O<SUB>3n</SUB> type materials, LTCC,
ceramic-polymer composites etc. The book also has a data table
listing all reported low loss dielectric materials with properties
and references arranged in the order of increasing dielectric
constant.

Key Features:

- collects together in one source data on all new materials used in
wireless communication
- includes tabulated properties of all reported low loss dielectric
materials
- in-depth treatment of dielectric resonator materials


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