FREE IEEE PAPER An Etched Ground GCPW 7:1 Unequal Wilkinson Power Divider

Conclusion and Result of An Etched Ground GCPW 7:1 Unequal Wilkinson Power Divider

The circuits were assembled with SMA end launchers and measured on an Agilent E5071C ENA from 2 – 8 GHz using a short open load through (SOLT) calibration. the simulated and measured results of the power divider, respectively. For the simulated design, the high and low impedance insertion loss values are -8.7 dB and -0.89 dB, respectively. It is believed that the 6 GHz resonance observed in  impacts the high impedance insertion loss resulting in a deviation from the ideal value of -9.03 dB. This resonance is due to the asymmetry of the high impedance line. The input return loss is better than -30 dB at 5 GHz while the isolation between high and low impedance sections is approximately -20 dB at 5 GHz.

The measured results show a high and low impedance insertion loss of -9.3 dB and -0.87 dB at 5 GHz. The input return loss is -25 dB and the isolation is better than that at 5 GHz. The measured 3 dB bandwidth defined by the input return loss is calculated to be 10.6 %. The circuits were measured in a round robin fashion by placing a 50 ? load on the port that was not connected to the network analyzer. While making isolation measurements, additional cables were required due to the close proximity of the connectors on the substrate.

As a result a slight ringing noise in the isolation data can be observed. Phase difference comparisons between ports 2 and 3 are shown in. The non-zero phase difference in both results is due to the natural asymmetry of this particular design. Additional efforts could be made to minimize the phase difference such as adding electrical length to the low mpedance side of the power divider.

the insertion loss values and calculated power division ratio for the ideal and the measured “etched ground” GCPW Wilkinson power dividers. Excellent results are achieved with approximately 0.25 dB of connector insertion loss observed in the data at 5 GHz. The calculated power division ratio for the actual structure is 6.93.

A 7:1 unequal Wilkinson power divider has been fabricated in 0.508 mm-thick Rogers RT/Duroid 5880. The measured results indicate a 6.9 power division ratio with isolation and input return loss greater than -20 dB at 5 GHz. A simple etching of the backside ground was used to realize the high impedance sections to achieve this high power division ratio. To the authors’ knowledge, this is the highest unequal Wilkinson power divider published.

Furthermore, by integrating the novel “etched ground” GCPW with the traditional GCPW, impedance values ranging from 30 5 to 230 5 can be realized on the same substrate. This technology has many applications in  planar circuits as demonstrated by the unequal Wilkinson power divider and can be extended to double-sided microwave integrated circuit technology (MIC) in a straight forward manner.

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