Read e-book online Basic Antennas: Understanding Practical Antennas and Design PDF

By Joel R. Hallas

ISBN-10: 087259999X

ISBN-13: 9780872599994

Uncomplicated Antennas is a finished advent to antennas--basic thoughts, useful designs, and info of easy-to-build antennas. You’ll tips on how to make antennas that actually work!
Includes:
Dipole Antennas
Antenna Impedance
Transmission Lines
Practical aspect 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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Sample text

_..... ,... ••• .. , . 0 1 .. .. , .. - ... , .. .. , <--- . , ... _ _ . ,- -- . -'-- " - .. - .. ,,-.. • ; ~ -, ' FIg 9-4 - TLW Im pedance a nd SWR of ed ande d double Zepp. Transmis s ion Lines as Tran stcrme rs 9-3 "'",eo"" I Tl. w, Trunsmtssion Lh~ Pl oeUW COl \\ilKlows Vt'! o. C3JlJ"JN ;QD:DJ3 . ~. b, Mi8Y'. ,.... t ~ L~ 1,/M ......... C 1tlf- . JlI. NI'III (" _ .. iA de . ~ 00 · J 0 00 1256 a'lp~ ' I e""! , lot i : Ollms. ELOO Ohml Ill: 0 co Ot;rtn Fig 9·6 - Coaxial loop 4:1 tr an s former-balu n .

O\~......... /\ /' Diffe re nce in Path Length \ - c ......... / ..... \ r-~ . _~ I _Spacing Height , Take-off or Elevation Angle Ground UBAQQ47 Fig 7·8 - End view of the two horizontal en d-lire dipoles, with phases as ind ica ted . The End·Flre Array on Its Side An interesti ng case to co nsider is the end-fire array with both antennas at the same heigh t. and still fed l8ne ou t-of-pha se as sbown in 1"12 7-8. An a 'iEC ele vation plot ove r typical real ground is shown in Fig 7-9. and it is interesti ng to compare this with tbe sim ilar loo king plot o f the broadside array respo nse in Fig 7-5.

CS in which operating lines in an unmatched condition can provide just wha t we need - easny predictable impedance tran sformation, The Quarter-Wava (IJ4) Transmission-Une Transformer Along a trans mission line that is 001 matched to its load, the voltage and curre nt will Val)' wi th d istance. providing a load to the transmitter end that is generally neither thai of the far end ~, nor the ~ of the transmission line. The ralio of max imu m voltag e on the line to minimum voltage on the line is cal led the stand ing WQI'(' ratio or SW'R.

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


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