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Abstract
Quarter-mode substrate integrated waveguide (QMSIW) is an effective technique to reduce the size of filters designed on SIW technology. An accurate prediction of the unloaded quality factor of QMSIW resonators helps to estimate the insertion loss of QMSIW filters. This article introduces new empirical equations to calculate the contribution of the finite conductor and radiation on the quality factors of QMSIW resonators. To show the accuracy of the equations, the calculated quality factor values are compared to values extracted from full-wave electromagnetic simulations for five different resonators at different frequencies and various substrate materials. For further comparison, these resonators were fabricated, and the quality factor values were extracted from measurements. The good agreement between simulations, measurements, and the predicted quality factors shows that accurate quality factor estimations can be made using the developed equations. Finally, a second-order filter is designed and fabricated to demonstrate the benefits of the proposed equations in microwave filter design.
Highlights
The rapid developments in microwave technology demand high performance, cost-effective, and low profile filters
Multiple well-known techniques for rectangular waveguides were applied to Substrate integrated waveguide (SIW) to reduce its size, including ridge SIW (RSIW) and folded half-mode SIW (HMSIW) (FHMSIW) [11], [12]
This paper introduces an empirical equation to model the total unloaded quality factor of a quarter-mode SIW (QMSIW) cavity resonator in which air acts as a magnetic wall and with no extension of the dielectric materials or the ground plane beyond the cavity edges
Summary
The rapid developments in microwave technology demand high performance, cost-effective, and low profile filters. The investigation analyzed the effect of radiation, conductor, and dielectric losses in extended substrate QMSIW cavities and modified shielded QMSIW cavities It systematically analyzes the loss contribution of each component on different substrate materials, thicknesses, and at different operating frequencies. This paper introduces an empirical equation to model the total unloaded quality factor of a QMSIW cavity resonator in which air acts as a magnetic wall and with no extension of the dielectric materials or the ground plane beyond the cavity edges. This work contributes to the previous investigations on the QMSIW cavity resonator quality factor by analytically estimating each of the QMSIW cavity loss contributions Using this new empirical equation, QMSIW filters can be designed effectively based on an analytical performance investigation
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