The Antenna Effect--a Simple Method for its Elimination.

(1)

18

The

Antenna Effect--&

^Simple

Method

for

i b Elimination.

0.

a.

^Kaaa~om,

^D.SC.,

^ANDDEBETARAYAH C H O ~ B U ~ , M.80., DACCA U ~ r v s s s ~ r n .

(Received for publication, August, 28, 1933. )

1. The Antena Effect.

When a waye of wave-length k reacha a frame aerial at a

dktance r from the transmitter in a direction t9 to the phne of the frame, the expression for the r e m i d current is given

where &=amplitude of the ainusoidal current along the

vertical aid- of the frame serial.

s =distance between the vertical sida.

a = phase-differen- b t w w n ths aurrenta dong tha two vertical. sidee of the Rame aerial.

v = velooity of the wavle, w =mgalar freqtremy.

k =a constant.

When the

digtance r is large cornpad with

tbe

d i m d i m d

theaerlsl,a=r and hutherwhen

f

< > I

where t 2

q,

^e,

A r

Thum the polar dingram showing amplitude d tbe d t d mrwnt tor varieue d h d i o n s ta the well-known

"

Figum 8 ^"dh-

(2)

(3)

(4)

(5)

(6)

(7)