A>tex<$Ka$>/tex<-Band Power Amplifier Based on the Traveling-Wave Power-Dividing/Combining Slotted-Waveguide Circuit

Spatial Power Combining Techniques for Semiconductor Power Amplifiers

“…The structures of the splitter and the combiner are identical. The differences between subsequent solutions are in the concept of EM field probes (Bashirullah & Mortazawi, 2000;Becker & Oudghiri, 2005;Jiang et al, 2003;Jiang et al, 2004;Sanada et al, 1995). For the centre frequency the short-ended section of the waveguide is transformed into the open-circuit and the half-wavelength sections of waveguide transforms adjacent probes impedance with no changes.…”

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

“…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.…”

“…An N = 8 traveling-wave power combiner using a slotted waveguide was proposed at Ka-band [2]. The structure had a bandwidth from 31.8 GHz to 35 GHz with the combining efficiency of 80%.…”

A Millimeter-wave Power Combining Amplifier Based on a Waveguide-Microstrip E-Plane Dual-probe Four-way Power Combining Network

“…Waveguide-based power combiners can offer good heat-sinking property and potential for high efficiency power combining. Recently, various kinds of waveguide-based power combining schemes were developed [3][4][5][6][7][8][9][10][11]. A waveguide-based power combining amplifier using broadband tapered-slot transitions was presented [3], and subsequently a 120-W solid-state Power Amplifier (PA) module was demonstrated at X-band, using finline array in WR-90 waveguide [4].…”

“…The limited cross-sectional size of waveguide at the higher frequency restricts the amount of the finlines inserted, and poor heat sinking property is brought in the narrow room, and then inconvenience of integrating high power Monolithic Microwave Integrated Circuits (MMIC) devices. The restriction against using high power solid-state devices was broken through by another combining scheme [7,8], in which the multi-way power combining network is arranged along the longitudinal direction of a slotted-waveguide. The longitudinally arranged multi-way power combining network is convenience of heat sinking efficiently of high power MMIC devices, however, the operating frequency bandwidth is limited due to longitudinal resonance in the slotted-waveguide.…”