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Model 1P510
Rev B
VSWR & DIRECTIVITY (CONTI NUED)
internal meandering of the coupled lines and
limitations of building perfect 50 transitions at the
input and output ports of the device are the most
significant factors against perfect VSWR and
directivity. Typically, VSWR and directivity of 1.15:1
and 25 dB respectively are achieved in practice.
INSERTION LOSS
Coupler insertion loss is defined as the log of the
input power divided by the sum of the power at the
two output ports. In practice, typical loss is
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 1P510’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
both pin configurations. The use of pin 1 or pin 2 as
the input port ensures phase consistency as well as
maximum power handling.
MOUNTING
For Xinger surface mount couplers to operate
optimally, there must be 50Ω transmission lines
leading to and from all of the RF ports. To ensure
proper electrical and thermal performance, there must
be a ground plane with 100% solder connection
underneath the part. If either of these two conditions is
not satisfied, insertion loss, coupling, VSWR and
directivity may not meet published specifications.
SUGGESTED FOOTPRINT
1P510* Mounting Footprint
Dimensions are in Inches [Millimeters]
To ensure proper electrical and thermal performance
there must be a ground plane with 100%
solder connection underneath the part
4X .063 SQ
[1.60]
4X .034
[0.86]
.170
[4.32]
.120
[3.05]
4X 50 Ω
Transmission
Line
Multiple
plated thru holes
to ground