Compact Triangular-Cavity Singlet-Based Filters in Stackable Multilayer Technologies

Abstract

In this letter, triangular-cavity bandpass filters are investigated in stackable multi-layer technologies in order to achieve highly compact designs with reduced fabrication complexity. The triangular-shaped cavities are first introduced in the form of singlets and then expanded on as a novel method for achieving a quasi-triplet filter response, where the filter's input and output irises are utilized as resonating means for two additional passband poles. Exploitation of this advanced singlet scheme exemplifies innovative use of resonant irises for achieving highly compact filters that can be manufactured with simple multi-layer fabrication steps for use in future terahertz applications.

Highly Selective Broadband mm-Wave Diplexer Design

“…The design of the diplexer is based on resonant iris and singlet theory presented in [9]- [15]. In [14], a highpass filter scheme was demonstrated through the use of alternating resonant irises and TM110-mode cavities in an inline fashion, while quasi-triplet responses were demonstrated in [15] using triangular cavities with resonant irises. In each of these works [14], [15], transmission zeros are only utilized in the lower end of the passband.…”

“…In [14], a highpass filter scheme was demonstrated through the use of alternating resonant irises and TM110-mode cavities in an inline fashion, while quasi-triplet responses were demonstrated in [15] using triangular cavities with resonant irises. In each of these works [14], [15], transmission zeros are only utilized in the lower end of the passband. In this work however, a modification is proposed in order to convert the highpass response described in [14] to a quasi-elliptic bandpass response by offsetting one or more of the singlet's feeding ports.…”

Metasurfaces for Filter Miniaturization and Out-of-Band Rejection Improvement

“…Each of these requirements is often addressed separately and can require tradeoffs in order to achieve specified goals. In regards to the quality factor, which determines the level of losses associated with a filter, many examples, such as [1] and [2] for K -band operation, and [3] and [4] for W -band operation, have been able to demonstrate compelling solutions using higher-order modes. In the effort to reduce the presence of spurious modes-which can often become too close to the passband-studies on the improvement of filter's out-of-band rejection by works such as [5], [6], [7], [8], and [9] provide effective solutions to suppress spurious modes.…”

The Anglet: An E/H-plane Bent, 90-Degree Twisted, TE101/TM110-Mode Singlet Building Block

“…Table 1 is provided as a summary of basic rectangular waveguide cavities using nonresonating modes. However, it can be noted that other geometries such as slanted ridges [6], triangular resonators [7], and circular waveguides [8], have also been demonstrated in conventional singlet configurations.…”