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Diplexers

Custom Built LC Filters

page LC_F/Diplexer

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Allen Avionics Diplexers are three-port frequency selective devices that may be used as a separator or a combiner of signals. The low-high diplexers manufactured by Allen Avionics consist of two filters sharing a common port. The common port and the output of the two filters (low and high) or (RX and TX) form the three terminals of the diplexer. Signals applied to the common port are separated in accordance with the passband frequencies of the filters.

Allen Avionics offers 6 different shape factors for the contiguous Low-High Diplexer series. For each shape factor a simple multiplication from the data listed in the table to the right will give you the frequencies for the 20dB & 40Db attenuation points. There are many choices for the custom packaging of diplexers which, includes surface mount, flat pack, through hole or in metal cases with connectors as listed in the table below. BNC or SMA connectors are both available.

Cut-Off (Fc)
Frequency
Range

Impedance
Range
Ohms

Shape
Factor 

Size
(Inches)
10KHz To
<100KHz

200 To 5K Ohms

A 4 x 3 x 1 1/4
B 4 x 3 x 1 1/4
C 5 x 3 x 1 1/4
D 6 x 3 x 1 1/4
>100KHz To
<500KHz

50 To 5K
Ohms
A 4 x 2 x 1 1/4
B 4 x 2 x 1 1/4
C 5 x 2 x 1 1/4
D 5 x 2 x 1 1/4
E 6 x 2 x 1 1/4
>500KHz To
<1.0MHz
50 To 600
Ohms
A 4 x 2 x 1 1/4

B

4 x 2 x 1 1/4

C

5 x 2 x 1 1/4

D

5 x 2 x 1 1/4

E

6 x 2 x 1 1/4

F

6 x 2 x 1 1/4

>1.0MHz
To
<5.0MHz

 50 To 75 Ohms

A 3 x 2 x 1 1/4
B

3 x 2 x 1 1/4

C

4 x 2 x 1 1/4

D

4 x 2 x 1 1/4

E

4 x 2 x 1 1/4

F 4 x 2 x 1 1/4
>5.0MHz
To <10MHz

 50 To 75 Ohms A 3 x 2 x 1 1/4

B

3 x 2 x 1 1/4

C 4 x 2 x 1 1/4
D 4 x 2 x 1 1/4
E 5 x 2 x 1 1/4
F 5 x 2 x 1 1/4
Cut-Off (Fc)
Frequency
Range
Impedance
Range
Ohms
Shape
Factor
Size
(Inches)

>10MHz
To
<10MHz

50 To 75 Ohms

A 3 x 2 x 1 1/4
B 3 x 2 x 1 1/4
C 4 x 2 x 1 1/4

D

4 x 2 x 1 1/4

E

5 x 2 x 1 1/4

F

5 x 2 x 1 1/4

 >10MHz
To
<25MHz

 50 Ohms

A

3 x 2 x 1 1/4

B

3 x 2 x 1 1/4

C

4 x 2 x 1 1/4

D

4 x 2 x 1 1/4

E

5 x 2 x 1 1/4

F

5 x 2 x 1 1/4

 >25MHz
To
<100MHz

 50 Ohms

A

3 x 2 x 1 1/4

B

3 x 2 x 1 1/4

C

4 x 2 x 1 1/4

D

4 x 2 x 1 1/4

E

5 x 2 x 1 1/4

F

5 x 2 x 1 1/4

 >100MHz
To
200MHz

 50 Ohms

A

3 x 2 x 1 1/4

B

3 x 2 x 1 1/4

C

4 x 2 x 1 1/4

D

4 x 2 x 1 1/4

E

5 x 2 x 1 1/4

 >200MHz
To
<250MHz

 50 Ohms

A

3 x 2 x 1 1/4

B

3 x 2 x 1 1/4

C

4 x 2 x 1 1/4

D 4 x 2 x 1 1/4

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