Available on Tape
and Reel For Pick and
Place Manufacturing.
USA/Canada:
Toll Free:
Europe
:
(315) 432-8909
(800) 544-2414
+44 2392-232392
Model 1P503S
Rev. C
Hybrid Couplers
3 dB, 90°
°°
°
Description
The 1P503S Pico Xinger is a low profile, miniature 3dB hybrid coupler in an
easy to use surface mount package designed for DCS and PCS
applications. The 1P503S is designed for balanced amplifiers, variable
phase shifters and attenuators, LNAs, signal distribution and is an ideal
solution for the ever-increasing demands of the wireless industry for smaller
printed circuit boards and high performance. Parts have been subjected to
rigorous qualification testing and units are 100% tested. They are
manufactured using materials with x and y thermal expansion coefficients
compatible with common substrates.
ELECTRICAL SPECIFICATIONS**
Features:
• 1.7 – 2.0 GHz.
• DCS and PCS
• Low Loss
• High Isolation
• 90o Quadrature
• Surface Mountable
• Tape And Reel
• Lead Free
• 100% Tested
Frequency Isolation*
Insertion
Loss VSWR
GHz dB Min dB Max Max:1
1.7 – 1.8 18 0.25 1.28
1.8 – 2.0 18 0.25 1.28
Amplitude
Balance
Phase
Balance Power Θ
ΘΘ
ΘJC
Operating
Temp.
dB Max Degrees Ave. CW Watts ºC/Watt ºC
± 0.45 ± 3 30 27.5 -55 to +85
± 0.30 ± 3 30 27.5 -55 to +85
**Specification based on performance of unit properly installed on microstrip printed circuit boards
with 50 Ω nominal impedance. * See Anaren Application Note #AAN-231 for information on
how to improve RF performance on your printed circuit board Specifications subject to
change without notice.
Outline Drawing
USA/Canada:
Toll Free:
Europe:
(315) 432-8909
(800) 544-2414
+44 2392-232392
Available on Tape and
Reel For Pick and Place
Manufacturing.
Model 1P503S
Rev. C
Typical Performance: 1.6 GHz. to 2.1 GHz.
AMPLITUDE BALANCE
3dB hybrids are a type of backward wave coupler. In
the design of these couplers, the even mode
impedance was chosen to ‘critically couple’ or slightly
‘over couple’ at mid band to maximize performance
and bandwidth. The amplitude balance specification
is defined as the difference (in dB) of the signals at
the COUPLED port output and the DC port output,
when compared to the average output level.
PHASE BALANCE
In theory, output ports of a backward wave hybrid
coupler remain in perfect phase quadrature
independent of frequency. In practice, factors
associated with the manufacturing processes slightly
degrade performance. The specification is typical two
to three degrees maximum although in practice,
phase balance is statistically better than specified
(<1o).
VSWR & ISOLATION
Similar to phase balance, the VSWR and isolation
of a coupler are theoretically perfect; where the
input and output ports are perfectly matched and no
power is coupled to the isolated port. In practice,
factors associated with the design and
manufacturing processes limit VSWR and isolation.
The significant limitations are associated with
limitations of building perfect 50
Ω
transitions at the
input and output ports of the device.
INSERTION LOSS
Coupler insertion loss is defined as the difference
of the input power from the sum of the output
power. In practice, loss is typically 0.20 dB.
Specification limits are somewhat higher due to
imperfect test conditions; as the couplers must be
tested in fixtures, which negatively affect results.
Coupling 1P503S
-3.8
-3.5
-3.2
-2.9
-2.6
1600 1700 1800 1900 2000 2100
Frequency (MHz)
Coupling (dB)
Return Loss 1P503S
-50
-40
-30
-20
-10
0
1600 1700 1800 1900 2000 2100
Frequency (MHz)
Return Loss (dB)
Isolation 1P503S
-50
-40
-30
-20
-10
1600 1700 1800 1900 2000 2100
Frequency (MHz)
Isolation (dB)
Phase Balance 1P503S
-93
-92
-91
-90
-89
-88
-87
1600 1700 1800 1900 2000 2100
Frequency (MHz)
Phase Balance (Degrees)
Available on Tape
and Reel For Pick and
Place Manufacturing.
USA/Canada:
Toll Free:
Europe
:
(315) 432-8909
(800) 544-2414
+44 2392-232392
Model 1P503S
Rev. C
Typical Insertion Loss Derating Curve for 1P503S
-0.4
-0.35
-0.3
-0.25
-0.2
-0.15
-0.1
-0.05
0
-100 -50 0 50 100 150 200 250 300 350
Temperature of the Part (
o
C)
In sertio n Lo ss (d B )
typical insertion loss (f=1800Mhz)
typical insertion loss (f=2000Mhz)
1P503S Power Derating Curve
0
5
10
15
20
25
30
35
40
45
50
0 50 100 150 200
Mounting Interface Temperature (
o
C)
P o w e r (W a tts )
85
Insertion Loss Derating:
The insertion loss, at a given frequency, of a group of
couplers is measured at 25°C and then averaged. The
measurements are performed under small signal
conditions (i.e. using a Vector Network Analyzer). The
process is repeated at 85°C and 150°C. A best-fit line
for the measured data is computed and then plotted
from -55°C to 150°C.
Power Derating:
The power handling and corresponding power derating
plots are a function of the thermal resistance, mounting
surface temperature (base plate temperature),
maximum continuous operating temperature of the
coupler, and the thermal insertion loss. The thermal
insertion loss is defined in the Power Handling section of
the data sheet.
As the mounting interface temperature approaches the
maximum continuous operating temperature, the power
handling decreases to zero.
If mounting temperature is greater than 85°C, Xinger
coupler will perform reliably as long as the input power
is derated to the curve above.
USA/Canada:
Toll Free:
Europe:
(315) 432-8909
(800) 544-2414
+44 2392-232392
Available on Tape and
Reel For Pick and Place
Manufacturing.
Model 1P503S
Rev. C
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.
MOUNTING
In order for Xinger surface mount couplers to work
optimally, there must be 50
Ω
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, which possess excellent
electrical and mechanical stability having X and Y
thermal coefficient of expansion (CTE) of 17 ppm/
o
C
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 50
Ω
lines need to be adjusted to the unique dielectric
coefficients and thicknesses as well as varying pick
and place equipment tolerances.
SUGGESTED FOOTPRINT
1P503S Mounting Footprint
Dimensions are in Inches [Millimeters]
Part Is Symmetric About All Axis
.174
[4.42]
.124
[3.15]
4X 50
Ω
Transmission
Line
To ensure proper electrical and thermal performance
there must be a ground plane with 100%
solder conection underneath the part
4X .045 SQ
[1.14]
4X .024
[0.61]
4X .099
[2.51]
4X .024 [0.61]
Multiple
plated thru holes
to ground
