Download PDF by Y.T. Lo, S.W Lee: Antenna handbook

By Y.T. Lo, S.W Lee

ISBN-10: 0442015933

ISBN-13: 9780442015930

Lo Y., Lee S. Antenna instruction manual (Van Nostrand Reinhold, 1993, 2)(ISBN 0442015933)

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Example text

_ _ _ _ _ _ _ _ _ _~_ _ _ _~~_ _~~_ _ _ _~~_ _~_ _ _ _- L_ _ _ _~ o 2r k1o/2 3r Fig. lI. Normalized radiation patterns of a cosinusoidal distribution. ) 4r © 1981 3. Aperture Gain The transmitting properties of an antenna are usually characterized by its gain. The directive gain G( 8,4» of an antenna in the (8, 4» direction is the ratio of the radiated power density from it at (r, 8,4» to its average radiated power density about the antenna at the range r. Thus - (76) Here P, is the total power radiated and can be calculated by integrating the numerator of (76) over a sphere of radius r surrounding the antenna.

T (I L •• _ 2L-L 1 : - . : . . •• t- /'--1 Top-loaded short Top-loaded and inductively loaded short (or Hertzian) J \l l,gJ J-1 2L 1_J (10 + 11)L 2/0L 80 2 (10 + 11)2 :n 102 ,e 320:n2~ (1+ :~)L 2L 1--/0--1 Half-wave ~\l -dl A/2 A, 10 :n 73Q A, :n Antenna Theory 6-16 10 L 'LL L 1 L 1L 1£ LL '1 1(1 LLL Ll -'lllL I If 5 .. 2- IIDI o 1. 0 ~ 1\ 1 2 1_ '-- - f - 11TTi CURRENT DISTRIBUTION ON TOP-LOT 5 10 20 50 100 ELECTRICAL HEiGIIT (H = 360h/A)-DEGREES Fig. 4. Theoretical radiation resistance of vertical antenna for assumed linear current distribution.

T- /'--1 Top-loaded short Top-loaded and inductively loaded short (or Hertzian) J \l l,gJ J-1 2L 1_J (10 + 11)L 2/0L 80 2 (10 + 11)2 :n 102 ,e 320:n2~ (1+ :~)L 2L 1--/0--1 Half-wave ~\l -dl A/2 A, 10 :n 73Q A, :n Antenna Theory 6-16 10 L 'LL L 1 L 1L 1£ LL '1 1(1 LLL Ll -'lllL I If 5 .. 2- IIDI o 1. 0 ~ 1\ 1 2 1_ '-- - f - 11TTi CURRENT DISTRIBUTION ON TOP-LOT 5 10 20 50 100 ELECTRICAL HEiGIIT (H = 360h/A)-DEGREES Fig. 4. Theoretical radiation resistance of vertical antenna for assumed linear current distribution.

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Antenna handbook by Y.T. Lo, S.W Lee


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