XC3500M-20S Datasheet, PDF (20/21 Pages) Anaren Microwave – 20dB Directional Coupler

Model XC3500M-20S
Rev A
MAIN
AMPLIFIER
20dB -- 30dB
DIRECTIONAL
COUPLER
DELAY
OUTPUT
INPUT
50 Ohm
3dB
HYBRID
COUPLER
TERMINATIONS
** (see table below)
10dB
DIRECTIONAL
COUPLER
DELAY
** RECOMMENDED TERMINATIONS
Power (Watts)
8
15
50
100
MODEL
RFP-060120A15Z50
RFP-250375A4Z50
RFP-375375A6Z50
RFP-500500A6Z50
CARRIER
CANCELLATION
ERROR
AMPLIFIER
Figure ap.n.2-1. Generic Feed Forward Circuit Schematic
Both directional couplers in the Figure ap.n.2-1 have one port terminated with a 50Ω resistor. In order to achieve
optimum performance, the termination must be chosen carefully. It is important to remember that a good termination
will not only produce a good match at the input of the coupler, but will also maximize the isolation between the input port
and isolated port. Furthermore, since the termination can potentially absorb high levels of power, its maximum power
rating should be chosen accordingly. A list of recommended terminations is shown in Figure ap.n.2-1. For an ideal
lossless directional coupler, the power at the coupled and direct ports can be written as:
P_coupled =
P_input
Coupling (dB)
10 ¹⁰
Watts
Eq. ap.n.2-1
P_direct = P_input −
P_input
Coupling ( dB )
10 ¹⁰
Watts
Eq. ap.n.2-2
where P_input is the input power in Watts, and Coupling(dB) is the coupling value in dB.
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