Model 1P520
Rev B
VSWR & DIRECTIVITY (CONTINUED)
MOUNTING
internal meandering of the coupled lines and For Xinger surface mount couplers to operate
limitations of building perfect 50Ω transitions at the optimally, there must be 50Ω transmission lines
input and output ports of the device are the most leading to and from all of the RF ports. To ensure
significant factors against perfect VSWR and proper electrical and thermal performance, there must
directivity. Typically, VSWR and directivity of 1.15:1 be a ground plane with 100% solder connection
and 25 dB respectively are achieved in practice.
underneath the part. If either of these two conditions is
not satisfied, insertion loss, coupling, VSWR and
directivity may not meet published specifications.
INSERTION LOSS
Coupler insertion loss is defined as the log of the
input power divided by the sum of the power at the
SUGGESTED FOOTPRINT
two output ports.
In practice, typical loss is
To ensure proper electrical and thermal performance
there must be a ground plane with 100%
solder connection underneath the part
approximately 0.20 dB. Specification limits are
somewhat higher due to imperfect test conditions;
surface mount couplers must be tested in test
fixtures that negatively affect results.
PIN CONFIGURATION
The 1P520’s have an orientation marker to denote
either pin 1 or pin 2. When the input port is
identified, the output, coupled and isolated ports are
known automatically. For example, if the input port
for a device was selected to be Pin 1, Pin 2
automatically becomes the output port, Pin 4
becomes the coupled port, and Pin 3 is the isolated
port. Similarly, if Pin 2 was to be selected as the
input port, the adjacent port on the long side (Pin 1)
is the output port, the adjacent port on the short side
(Pin 3) is the coupled port, and the opposite port
(Pin 4) is the isolated port. Either port on the same
side as the orientation marker can be selected as
the input port, as shown in the table, which shows
.170
Multiple
[4.32]
plated thru holes
to ground
.120
[3.05]
4X .034
[0.86]
both pin configurations. The use of pin 1 or pin 2 as
the input port ensures phase consistency as well as
maximum power handling.
4X .063 SQ
Ω
4X 50
[1.60]
Transmission
Line
Dimensions are in Inches [Millimeters]
1P520* Mounting Footprint
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Available on Tape
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