Compact half-mode SIW cavity filters designed by exploiting resonant mode control

Abstract

This article presents a novel band‐pass filter topology, based on the half‐mode substrate integrated waveguide (HMSIW), which allows for the simple design and easy manufacturing of filters with different bandwidth and number of poles. The design strategy, based on the modification of HMSIW cavity modes, is discussed in the case of two‐pole and four‐pole filters, and two prototypes are implemented and experimentally verified. © 2015 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:72–79, 2016.

Substrate Integrated Waveguide Cavity Filters: Miniaturization and New Materials for IoT Applications

“…By using the HMSIW technology, it is possible to realize a filter with a geometry very similar to that used for folded waveguide, as firstly proposed in [17]. In fact, the fundamental mode of the HMSIW can be excited by a microstrip line, same as the fundamental mode of the folded SIW can be excited by a stripline.…”

“…By adopting the proposed geometry, a four-pole filter with central frequency at 4.5 GHZ and 1.4 GHz bandwidth has been designed and manufactured in [17]. In this case, the fabrication required the processing of one single layer of Taconic TLX-9 laminate, with a complexity reduction compared to the folded SIW filter proposed in the previous section.…”

Increasing the bandwidth of cavity-backed SIW antennas by using stacked cavities

“…microstrip lines and coplanar waveguides), as well as with active devices and microwave monolithically integrated circuits. A large variety of microwave and millimeter-wave SIW components have been implemented in the last 15 years, ranging from interconnects [8, 9] and filters [10, 11] to active antennas [12, 13]. Moreover, SIW technology allows integrating a complete system in a single dielectric substrate, according to the system-on-substrate paradigm [14]: this approach permits to avoid any transition between components developed by using different technologies, thus reducing losses and complexity.…”

Sixteenth‐mode substrate integrated waveguide cavity filters

“…Several techniques are adopted to reduce the size of SIW filters including folded SIW, folded and ridge SIW, and complementary split‐ring resonators (CSRRs)–loaded SIW . Another miniaturization scheme is based on half‐mode SIW (HMSIW), quarter‐mode SIW (QMSIW), and eighth‐mode SIW (EMSIW), and they are obtained by bisecting the standard SIW along the symmetry planes . However, the reported structures in the literature are either complex in design or their size is still large, and further miniaturization is required.…”

“…4 Another miniaturization scheme is based on half-mode SIW (HMSIW), quarter-mode SIW (QMSIW), and eighth-mode SIW (EMSIW), and they are obtained by bisecting the standard SIW along the symmetry planes. [5][6][7][8][9][10][11][12][13] However, the reported structures in the literature are either complex in design or their size is still large, and further miniaturization is required. In addition, these structures do not exhibit wide-stopband performance.…”