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Download PDF by Joel R. Hallas: Basic Antennas: Understanding Practical Antennas and Design

By Joel R. Hallas

ISBN-10: 087259999X

ISBN-13: 9780872599994

Simple Antennas is a finished advent to antennas--basic innovations, functional designs, and information of easy-to-build antennas. You’ll make antennas that truly work!
Includes:
Dipole Antennas
Antenna Impedance
Transmission Lines
Practical point Arrays
Wideband and Multiband Antennas
Reflector Antennas
Yagis for HF and VHF
Loop Antennas
Antennas for Microwave Applications
Vehicle Antennas
Antenna Measurements
Plus, an creation to Antenna Modeling...and even more!

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Extra info for Basic Antennas: Understanding Practical Antennas and Design

Example text

That's about everythingI could think to ask, except which pile in the basementactually holdsmy RG·58A1 A. third VMf to fWSluale the input lrnpedanoe Is bough a graphical mem00. A Smiltl chart. see Ag 5-S. can be used 10 determine the input impedance of a transmission line. bi~OlJS. This may result In sigtlficarrt error dependilg on the 8IT1O\Ilt of line Io6s. I( be I n w, TJ ~Lblld.... mfor. \\'\Pdo9fl ' ,.... l~ , nJi ......... ] W. , " _ ~_ 'I" ! , ·· ",'f11 · lI"I' l r~ :::J ~'-' .... - > "" ,,;,,..

A num ber of other effects co mbine to eliminate the very low-angle propagation. here the pattern s for perfect and typical grounds are compared . Compare the se results to those of the horizo ntal array in Chapter 4 at a co mpara ble heigh t and note th at th e peak of the ve rtical beam is still at a slightly lower angle. Different applications oflen find one orientation superior to ano ther. For examp le. early naval shipbo ard rad ar sys tems tried vertic al polariz a- tion. uuld he excel lent for obse rvin g distant surface vesse ls.

The Field From Two Horizontal Dipoles Chuck Hutchinson , KBCH, adju sts his two element array. Contents THe Field From Two Hori zontal Dipoles Horizontal Dipoles in a "Stack" " 7-2 , 7-2 Chapter Summary 7-7 Review Questions 7-7 The Field From Two Horizontal Dipoles In Chapter 3 I des cribed the action of a dipole in the presence of itv below-gro und " image antenna: ' II is also com mo n to find antenna arrays of moll irk real di poles. As you migh t expect fro m the d isc ussio n uribe dipole abo ve its image antenn a in Chapter 3.

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Basic Antennas: Understanding Practical Antennas and Design by Joel R. Hallas


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