B0110E50200AHF Datasheet, PDF (4/6 Pages) Anaren Microwave – Ultra Low Profile 1008 Balun

Model B0110E50200AHF
Rev A
Distortion Considerations:
This balun does NOT contain any ferrite materials and are as such distortion free. Very, very low levels of
distortion can arise from dissimilar metals on the contact pads of the part (Cu-Ni-Au) and from inter-metallic
contaminations within the part.
Power Handling Considerations:
The RF-power handling capability of these baluns depends on the temperature at the mounted interface (base
plate temperature), and whether or not DC-bias is feed through the part. The power handling specified is for
a mounted temperature of 85˚C and no DC-bias and is based on a maximum operating temperature of the
part itself of 125˚C (do not exceed this).
The maximum power handling relates to the dissipated power within the part and is therefore a function of
insertion loss. The insertion loss of this device changes within the specified band. Thus if operated with a
narrowband signal at either band edge (this is what is specified) it will have less power handling than if
operated closer to the center of the band or if operated with a very wideband signal. If signals arrive at the
balun that are out of the specified band, these must be included in the total dissipated power calculation.
However the deteriorating return loss will eliminate some of this power.
The dissipated RF power can be estimated as;
P_{RF ,diss}
=
P_in
⎜⎜⎝⎛¹
−
−
10
⎜⎛
⎝
RL_dB
10
⎟⎞
⎠
⎟⎟⎠⎞⎜⎜⎝⎛¹
−
−⎜⎛
10 ^⎝
IL_dB
10
⎟⎞
⎠
⎟⎞
⎟⎠
[W ]
Where:
• P_in is the input power, either on the low impedance side, single ended or the combined differential power
on the balanced side, depending on the feeding direction.
• RL_dB is the return loss in dB associated with the feeding port. I.e. if feed from the balanced side then the
balanced return loss must be used (this however is very similar to the single ended return loss).
• IL_dB is the insertion loss at the operating temperature of the device.
Below the dissipated power is shown at a normalized 1W input power for the balun internal temperature of
125˚C.
When used with DC-biasing the RF-power must be de-rated with the amount of DC power dissipated;
( ) P_dc,diss =
R_out1 || R_{out 2}
I
2
dc
≈
7
I
2
dc
[W ]
The total dissipated power cannot exceed 0.5watts.
When the duty cycle is not 100% the input power can be averaged, however the instantaneous input power
should newer exceed 0.5watts.
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