In this work, the power handling capability of microstrip filters is studied in detail. This study is addressed from two perspectives, depending on the physical phenomenon limiting the maximum power that the microstrip filter can handle. One of these phenomena is air breakdown or corona effect, which is linked to the peak power handling capability (PPHC) of the device, and the other is the self-heating, which limits the device average power handling capability (APHC). The analysis is focused on three kinds of filtering topologies widely used both in academia and industry, such as the coupled-line, stepped impedance resonator and the dual-behaviour resonator based filters. Closed-form expressions are computed to predict both the PPHC and the APHC as a function of the geometrical parameters of the resonators integrating the filter. Guidelines are also given to extrapolate the provided computations to other filtering topologies based on other kinds of resonators. To validate this research study, three bandpass filters centered at 5 GHz have been implemented and fully characterized by means of two measurements campaigns which have been carried out, one for the PPHC and another one for the APHC. The measured results have validated the performed study and corroborated the conclusions obtained throughout the paper. Index Terms-Average power handling capability (APHC), coupled-line filter, electro-thermal analysis, microstrip filter, peak power handling capability (PPHC), power applications, stepped impedance resonator (SIR).
In this paper, the average power handling capability (APHC) of microstrip passive circuits considering the metal housing and environment conditions is investigated in detail. A systematic method is proposed for the computation of the APHC of microstrip circuits in open and enclosed metal housing configurations, typically used in microwave components. The method also yields an estimate of the maximum temperature in a microstrip circuit for a given input power. Closed-form equations accounting for external conditions, such as convection or radiation heat transfer are given to evaluate the APHC. For validation, two microstrip bandstop filters centered at 10 GHz are analyzed following the proposed model, and the results are compared with those simulated showing a good agreement. In addition, both circuits are fabricated and characterized. Thermal profile measurements are provided, confirming the predicted results. The effect of the topology layout and the electromagnetic performance on the APHC are also discussed. Index Terms-Average power handling capability (APHC), electrothermal analysis, metal housing, microwave devices, planar circuits, power applications. I. INTRODUCTION M ICROSTRIP passive circuits are an essential part in transmitter and receiver systems. They generally manage signal transmission between stages, filtering, and/or power division. Microstrip circuits may limit the maximum working power of the communication system. Their maximum power handling capability can be determined by the heating in the materials (related to the ohmic and dielectric losses), which limits average power handling capability (APHC), and by the dielectric breakdown field (related to the maximum peak voltage that the dielectric can withstand) limiting Manuscript
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