Base On Waveguide Bridge Ka-Band Power Synthesis

Millimeter wave power source, as the core component of the millimeter wavecircuit system, with the deepening development of millimeter wave technology andwide application, the requirement for power output is higher and higher.Greater poweroutput means that the system has a bigger radius and more strong anti-interferenceability, this is undoubtedly the millimeter wave systems, especially militarymillimeter-wave systems needed. Therefore, millimeter wave power has more andmore researched and focused on by the international and domestic industry experts. Atmillimeter-wave frequencies, the output power of electric vacuum components is high,can satisfy the power demand of most of the engineering application system, but in theface of today’s common engineering application system development trend ofminiaturization, it’s application is inevitably limited. A single solid state MMIC chip’soutput power often can not meet the need of engineering application. In order to solvethis contradiction, we need to adopt the method of solid state power synthesis,combining some coherent solid state power devices, then get more power output.This paper study current international and domestic some kinds of powersynthesis technology and on the basis of considering the existing processingtechnology level, designed a compact structure、small volume、easy processing andhigh efficiency four-way power synthesizer based on waveguide H plane gap coupling.First of all,this paper analyzed the theory of millimeter wave power amplifier, and usedelectromagnetic simulation softwave Ansoft HFSS to establish the module ofwaveguide to microstrip transition,which must be used in the system, and thecavity,then simulate、optimaze、 introduce some key millimeter wave process andmade a31-36GHZ frequency band drive power amplifier. Secondly, this paperanalysis the theory of waveguide H plane gap coupling structure and four-waydistribution/synthetic network、establish the module、simulate and optimize, thenmade a31-36GHZ frequency band，which size is110mm70mm28mm,four-waysolid state power amplifier. The results showed that in the32.5-36GHZ frequency bandrange,the output power higher than5W and in the31-36GHZfrequency band range the average synthesis efficiency higher than76.8%,the goal is matched and finallyverified the feasibility of the designed circuit structure and made technologypreparation for later more ways power synthesizer.Due to the design of the synthetic circuit structure’s highlights mainly lies in thepractical aspects, such as easy processing and small volume, so we choose ourlaboratory’s TriQuint MMIC TGA1141,whose saturated output power is2W,for thedrive power amplifier and four-way power synthesizer.