Abstract
This paper introduces a four-way power combiner operating in the 94 GHz millimeter-wave based on spatial power combining technology. The four millimeter-waves with Gaussian beams are combined in the waveguide, increasing the output power. The combiner is composed of five circular waveguides connected by four long and narrow coupling slots. Four sub-waveguides are separately connected to four input ports and one main waveguide is connected to a common output port. The TE11-mode is used as the input mode, which has two vertical and horizontal polarization directions. Four sub-waveguides are respectively input corresponding to polarization directions TE11-wave with Gaussian beams. The power of TE11-wave is transmitted to the main waveguide by the coupling slots, combined in the main waveguide, and output with the common port. We analyze the combiner and verify the availability of the design structure by numerical stimulation with CST MWS (Microwave Studio) software. The power-combining efficiency can be over 97%, and the output beams remain Gaussian beams with nearly fourfold increased power. The proposed model provides technological approaches for power combiner application in millimeter-wave.
Highlights
The output power from a single power source is limited
This paper presents a four-way power combiner in 94 GHz high frequency millimeterwave
The power combiner is designed with a symmetrical structure by circular waveguides and coupling slots
Summary
The output power from a single power source is limited. Higher power generation is not possible from a single source. The power combiner is a key component to increase output power in the microwave and millimeter-wave system. Xin Cao proposed a two-way power combiner, operated on 30 GHz with 800 mw of power and 78.9% of combining efficiency [1]. Most research for power combiner has been focused on microwave [3,4] and low-frequency millimeter-wave [5]. These have problems of too large size and low power, respectively
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