Ultra-Wideband(UWB) Diplexer
UWB diplexer designed and developed at Finash Technologies covers two frequency bands S-band and S-band. Its Channel 1is of 1300 MHz bandwidth of (2.9-4.2 GHz) and channel2 of 1500 MHz bandwidth ( 4.5-6GHz). Inter-channel isolation≥60 dB and input power at input of each channel port is 200watt. Filters of 13th order complies the isolation requirements, therefore the overall order of the diplexer is 26. Finash Technologies may be first company to commercially offer UWB diplexer with such stringent specifications.
Both channels are of wide bandwidth, the common junction has to excite 2.9-6 GHz bandwidth, is not possible to achieve using the conventional T-junctions or resonating node commenly discussed in the literature, an innovative T-junction is proposed that can excite very wide-band and the diplexer has been designed based on it.
Physical structure of diplexer manufactured of aluminium
Dimensions (with connectors)
Length: 350mm
Width: 55mm
height: 25.5
weight : 360 g
Measured Amplitude response of the Diplexer:
Port 1 is common port
Port 2 is for channel 1
Port 3 is for channel 2
Measured Results of UWB Diplexer
Upon costumer’s new requirements of reduced insertion loss and some relaxation in isolation the diplexer was redesigned and fabricated. The resonator size was increased, the new diplexer was quite large, Length :415mm (including connectors), width: 55 mm, height: 36 mm. As the structure was quite long, the diplexer was manufactured using brass material and then silver plated. The weight of a single unit is around 2Kg.
2nd model of UWB Diplexer
Dimensions including connectors:
length: 415mm
width: 55 mm,
height: 36 mm.
The diplexer on weighing scale
weight :2Kg
Measured S-parameters (insertion loss and return loss) replotted using circuit simulator
Markers m8 and m9 represent min insertion loss
Measured Performance of 2nd Diplexer
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*Return loss :(RL) is slightly higher at a few points, RL is sensitive for even cable bending, as the unit is long17 in, some bending in cable has effect in variation of RL
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**Insertion loss: Compensation of loss 0.15 dB of adapter pair has been applied
Environmental
Qualification:
Similar products have been qualified according to MIL-STD 810G standards for vibration, shock, and thermal conditions