Model 1P503S
Rev. A
Typical Performance: 1.6 GHz. to 2.1 GHz.
Coupling 1P503S
-2.6
Return Loss 1P503S
0
-10
-20
-30
-40
-50
-2.9
-3.2
-3.5
-3.8
1600
1700
1800
1900
2000
2100
1600
1700
1800
1900
2000
2100
Frequency (MHz)
Frequency (MHz)
Isolation 1P503S
Phase Balance 1P503S
-10
-20
-30
-40
-50
-87
-88
-89
-90
-91
-92
-93
1600
1700
1800
1900
2000
2100
1600
1700
1800
1900
2000
2100
Frequency (MHz)
Frequency (MHz)
AMPLITUDE BALANCE
VSWR & ISOLATION
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.
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.
PHASE BALANCE
In theory, output ports of a backward wave hybrid coupler
remain in perfect phase quadrature independent of
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.
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
o
than specified (<1 ).
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Manufacturing.
ANAREN [ ANAREN MICROWAVE ]
