A Ka-band waveguide-based traveling-wave spatial power divider/combiner

Abstract

A Ka-band waveguide-based four-stage eight-way power divider/combiner is presented based on the traveling-wave technique and the spatial power combining technique. The dualprobe, which are symmetrically inserted in one broadside of the waveguide, double the power dividing ways without adding the insertion loss. The method of images is used to simplify the analysis and design process of the dual-probe structure. The power divider/combiner is designed, fabricated and measured to demonstrate its wide bandwidth and low insertion loss performance. From 30GHz to 40GHz, the measured return loss of the back-to-back structure is lower than -15dB and the insertion loss is less than 1.2dB.

A Compact Ka-Band Broadband Waveguide-Based Traveling-Wave Spatial Power Combiner With Low Loss Symmetric Coupling Structure

“…Because the E-T junction is needed additionally, the insertion loss of the proposed structure is the same as the structure proposed in [7] in the case of eight-way power combiner. However, when the combining ways increased, the insertion loss is less and the design process is simple compared to the technique proposed in [7]. The structure has potential to realize more coupling ways with high power combining efficiency at millimeter and even higher frequencies.…”

“…Here, the combining ways are quadrupled but the insertion loss increases little by inserting the dual-probe on both broadwalls of the waveguide. Compare with paper [7], the combing ways are doubled in the situation of the same power dividing stages and an E-T junction is needed. Because the E-T junction is needed additionally, the insertion loss of the proposed structure is the same as the structure proposed in [7] in the case of eight-way power combiner.…”

“…Compare with paper [7], the combing ways are doubled in the situation of the same power dividing stages and an E-T junction is needed. Because the E-T junction is needed additionally, the insertion loss of the proposed structure is the same as the structure proposed in [7] in the case of eight-way power combiner. However, when the combining ways increased, the insertion loss is less and the design process is simple compared to the technique proposed in [7].…”

“…It is necessary to combine power from multiple devices to obtain the desired power levels because the output power from an individual solidstate device is often not enough at millimeter-wave frequencies [1][2][3][4][5][6][7][8][9][10]. Planar divider/combiner based on Wilkinson types offer noticeable power loss at millimeter frequencies.…”

“…In [7], the coupling ways are doubled by using dual-probe structure inserted into one broadwall of the waveguide. Here, the combining ways are quadrupled but the insertion loss increases little by inserting the dual-probe on both broadwalls of the waveguide.…”