第四章patch 天線設計

4-1

Patch

4-1

Patch

Patch

LW 1950 1955

1970 4-1

Patch

4-1 Patch

Patch 4-2

4-2 Patch

4-2

Patch

MMIC(Monolithic microwave integrated circuit)

Q( 100)

(poor polarization purity)

(Q

WBW 0= )

4-2

patch

(transmission line model)(cavity model)(full-wave

analysis)

(1)

patch

(2)

E H H (Perfect magnetic

wall)(PMC) patch PMC

(3)

4-3

FEKOIE3DEnsemble Momentum

FEKO

(Full wave analysis)

patch (Low-profile antenna)

Patch

Patch

Patch Patch

()

patch

4-3 W L

(W )

TM

4-5

1979 (Cavity model) Patch

(close proximity)

E H H

z

H H

4-4

(PMC)(Perfect electric wall)

TM

(Slot antenna)

Patch [1] Patch

Patch

(a)

(Fringing field)(Fringing effect)

4-3 4-4

Patch Patch Wh

W/h r L/h>>1

W

Patch

4-3

4-5

4-4

4-5 (

)(Inhomogeneous

media) 4-5

W/h>>1 r >>1

4-6

eff [1]

4-5 4-6

(b)

Patch

()

r h

4-6

()

(1) Patch WL

[1] W

1

221

22

1 000 +

=+

=rrrr ff

w

(4-1)

0 (free-space)

(2) W reff

wh

rrreff /121

12

12

1+

+

+=

(4-2)

(3)(4-3) 4-7 L

+

++

=

8.0)258.0(

264.0)3.0(412.0

hw

hw

hL

reff

reff

(4-3)

(4) L effL

LLLeff += 2

(5)

( )( )

0010

0

12 2 2r reff reff r

fL L L

= =+

(4-4)

(4-4)TM

(4-3) L

Lf

Lreffr

= 22

1

00 (4-5)

4-7

LL

4-7

()

patch

4-7 (Radiating slot)

4-8

(slot)[1]

111 jBGY +=

W

( )

= 20

01 24

11120

hkWG

101

0