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Model 1P520

Rev B

VSWR & DIRECTIVITY (CONTINUED)

internal meandering of the coupled lines and

limitations of building perfect 50

Ω 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 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

both pin configurations

the input port ensures phase consistency as well as

maximum power handling.

MOUNTING

For

Xinger

surface

mount

couplers

to

operate

optimally, there must be 50

Ω 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

1P520* 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]

Transmission

Line

Multiple

plated thru holes

to ground