A Multilayer T-Septum Substrate Integrated Waveguide Filter

ABSTRACT

A multilayer T-septum structure and its application to a substrate integrated waveguide filter are presented. Coupling mechanisms in a T-septum structure, including stacking vertical layer and adjacent common sidewall, are discussed in detail. The T-septum resonance cavity exhibits not only excellent parasitic response characteristics, but also features of a miniature structure. The proposed filter with fourth-order T-septum resonators has two transmission zeros, which can be adjusted flexibly by controlling the coupling strength and manner. With the assistance of the low temperature co-fired ceramic multilayer structure and refined coupling structure, the proposed filter has a more compact size while maintaining high selectivity. A demonstration filter is designed, fabricated, and measured to validate the proposed structure. Measured results are provided showing good performance and agreement with the simulated examples.

KEYWORDS:

• Cross coupling
• filter
• low temperature co-fired ceramic (LTCC)
• T-septum substrate integrated waveguide (TSSIW)

Funding

This work was supported by the National Natural Science Foundation of China (Grant No. 61301052), and Fundamental Research Funds for the Central Universities of China (Grant Nos. ZYGX2015J095 and ZYGX2016J145).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China (Grant No. 61301052), and Fundamental Research Funds for the Central Universities of China (Grant Nos. ZYGX2015J095 and ZYGX2016J145).