JP503_14 Datasheet, PDF (4/6 Pages) Anaren Microwave – Hybrid Couplers

Model JP503
Rev. D
PIN CONFIGURATION
All of the standard surface mount 3dB hybrid couplers
have pin orientations that are symmetrical. When a port
is designated as the input, automatically the two output
and isolated ports are defined. For example, if the input
port for a device was selected to be Pin 1, Pin 2 is
automatically the isolated port, Pin 4 is the 0 degree
reference output port, and Pin 3 is the output port which
“lags” behind the reference output port by 90 degrees.
Similarly, if Pin 3 was to be selected as the input port,
the adjacent port on the long side (Pin 4) is the isolated
port, the adjacent port on the short side (Pin 2) is the 0
degree output port, and the opposite port (Pin 1) is the -
90 degree output port. Below is a table of all possible
orientations.
electrical and mechanical stability having X and Y
thermal coefficient of expansion (CTE) of 17 ppm/^oC
When a surface mount hybrid coupler is mounted to a
printed circuit board, the primary concerns are;
insuring the RF pads of the device are in contact with
the circuit trace of the PCB and insuring the ground
plane of neither the component nor the PCB is in
contact with the RF signal. As long as the geometry
of the unit fits onto the layout of the circuit trace on
the PCB, and the conditions of the previous
paragraph are followed, the coupler’s performance is
ensured. An example of how the PCB footprint could
look is shown below. In specific designs, the 50Ω
lines need to be adjusted to the unique dielectric
coefficients and thicknesses as well as varying pick
and place equipment tolerances.
SUGGESTED FOOTPRINT
To ensure proper electrical and thermal performance
there must be a ground plane with 100%
solder conection underneath the part
MOUNTING
In order for Xinger surface mount couplers to work
optimally, there must be 50Ω transmission lines leading
to and from all of the RF ports. Also, there must be a
very good ground plane under the part to ensure proper
electrical performance. If either of these two conditions
are not satisfied, insertion loss, coupling, VSWR and
isolation may not meet published specifications.
Overall ground is improved if a dense population of
plated through holes connect the top and bottom ground
layers of the PCB. This minimizes ground inductance
and improves ground continuity. All of the Xinger hybrid
and directional couplers are constructed from ceramic
filled PTFE composites that possess excellent
4X .024 [0.61]
4X .024
[0.61]
.174
[4.42]
4X .045 SQ
[1.14]
4X .099
[2.51]
Dimensions are in Inches [Millimeters]
JP503* Mounting Footprint
Multiple
plated thru holes
to ground
.124
[3.15]
4X 50 Ω
Transmission
Line
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