DUAL/CIRCULAR POLARIZED BACKFIRE-FED REFLECTOR ANTENNAS

This section contains information on parabolic reflector antennas fed from the vertex using a circular waveguide and a "splash-plate" feed arrangement.

This simple, compact design allows the antenna to have any desired polarization, including orthogonal linear, orthogonal circular and variable linear. This type of antenna is quite suited to applications where the reflector is gimbal-mounted because the swept volume can be reduced. Although limited in efficiency to about 50%, this style of reflector antenna finds wide applications in many microwave communications systems. Please refer to Pages 30 and 46 for other examples.

The following is a representative listing of backfire-fed reflector antennas. Variations to suit your requirements are readily available. All RF ports are waveguide flanges located behind the reflector vertex.

SPECIFICATIONS
Model
Number		 Frequency
GHz		 Reflector
Diameter
Inches		 Gain
dBi(c)
Midband(s)		 RF Port(s) Polarization Features
AS72-44C
3.70 - 4.20
72
34.6
CPR-229
Dual Circular
AS72-66C
5.925 - 6.425
72
38.4
CPR-137
Dual Circular
AS24-77C
7.25 - 8.40
24
30.5/31.5
CPR-112
Dual Circular
AS48-77C
7.25 - 8.40
48
36.2/36.9
CPR-112
Dual Circular
AS66-77C
7.25 - 8.40
78
39.2/40.5
CPR-112
Dual Circular
7-panel reflector
AS19S-1214
11.70 - 14.5
19
32.8/34.2
WR-75
Dual Linear
AS24-1214C
11.70 - 14.5
24
35.8/36.6
WR-75
Dual Circular
AS20-120CR
12.20 - 12.75
20
33.0
WR-75
Remote Circular
DSS Antenna
AS24-120CR
12.20 - 12.75
24
35.5
WR-75
Remote Circular
DSS Antenna
AS18-140C
14.00 - 14.5
18
34.8
WR-75
RHCP or LHCP
Manual polarization
AS24-145C
14.00 - 15.0
24
36.9
WR-75
Dual Linear
AS36-140
14.00 - 14.5
36
39.1
WR-75
Dual Linear
AS16-147C
14.70 - 15.3
16
33.2
WR-62
RHCP
300 watts CW
AS6-2020
19.00 - 21.0
6
25.1
WR-42
Dual Linear
AS6-200C
19.00 - 21.0
6
25.1
WR-42
Dual Circular
AS12-2020
19.00 - 21.0
12
33.3
WR-42
Dual Linear
AS12-200C
19.00 - 21.0
12
33.3
WR-42
Dual Circular
AS12-385
37.00 - 39.5
12
38.4
WR-28
Linear H or V
MPT-1414 Std. Perf.
AS12-385HP
37.00 - 39.5
12
38.4
WR-28
Linear H or V
MPT-1414 Hi. Perf.
AS24-385
37.00 - 39.5
24
44.0
WR-28
Linear H or V
MPT-1414 Std. Perf.
AS24-385HP
37.00 - 39.5
24
44.0
WR-28
Linear H or V
MPT-1414 Hi. Perf.
AS12-390390
38.70 - 39.7
12
38.8
WR-28
Dual Linear
AS48-1414C/N

1.4 - 2.4

48

22.7 @ 1.5GHz
26.0 @ 2.2GHz

 "N" Female

Dual Circular

 Beamwidth 8.3º by 8.6º at 1.9GHz. Sidelobe 20.7 dB by 19.8 dB. Weight 228lb.
pg58a
Model AS24-77C
24-inch X-band
pg58bpg58c
Model AS19S-1214
19-inch Ku-band
pg58d
Model AS24-1214C
24-inch Ku-band
pg58g
Model AS24-120CR
24-inch Ku-band
pg58e
ModelAS36-140
36-inch Ku-band
pg58f
Model AS16-147C
16-inch Ku-band
pg58h
Models AS24-385 & AS12-385
24-inch & 12-inch, 38 GHz