Tifenn Martin

High performance air-filled substrate integrated waveguide filter post-process tuning using capacitive post

This paper presents an air-filled substrate integrated waveguide (AFSIW) filter post-process tuning technique. The emerging high-performance AFSIW technology is of high interest for the design of microwave and millimeter-wave substrate integrated systems based on low-cost multilayer printed circuit board (PCB) process. However, to comply with stringent specifications, especially for space, aeronautical and safety applications, a filter post-process tuning technique is desired. AFSIW single pole filter post-process tuning using a capacitive post is theoretically analyzed. It is demonstrated that a tuning of more than 3% of the resonant frequency is achieved at 21 GHz using a 0.3 mm radius post with a 40% insertion ratio. For experimental demonstration, a fourth-order AFSIW band pass filter operating in the 20.88 to 21.11 GHz band is designed and fabricated. Due to fabrication tolerances, it is shown that its performances are not in line with expected results. Using capacitive post tuning, characteristics are improved and agree with optimized results. This post-process tuning can be used for other types of substrate integrated devices.

Air-Filled SIW interconnections for high performance millimeter-wave circuit and system prototyping and assembly

In this paper, the interconnection between two sections of Air-Filled Substrate Integrated Waveguide (AFSIW) transmission line is presented. AFSIW is of high interest for high performance and low-cost millimeter wave applications. It is based on multilayer Printed Circuit Board (PCB) process. For system prototyping and assembly, it is common to interconnect components and sub-circuits. However, to comply with stringent specifications, especially for space and aeronautical applications, connectors must be avoided as they directly impact the cost, the size and the loss. Also, transition from AFSIW to conventional transmission lines to implement conventional interconnect solutions will not be optimal in term of loss, size and power handling. Instead, in this paper, a direct interconnect between two AFSIW sections is studied. An experimental demonstration of the proposed interconnection shows a 0.29 dB insertion loss.