Compact multilayer SRR-loaded integrated waveguide filters on liquid crystal polymer substrate

This article presents a compact bandpass filters based on rectangular substrate integrated waveguides and split ring resonators for implementation in multilayer LCP technology were proposed. Filter which included two sections of E-resonator and SRR was tuned up to central frequency of about 28 GHz and bandwidth of about 2 GHz

Development of waveguide filter structures for wireless and satellite communications

This thesis explores the possibilities of the design and realization of compact conventional and substrate integrated waveguide structures with improved performance taking advantage of recent cross-coupled resonator filters theory achievements such as the modular filter design approach using non-resonating nodes and inline extracted pole filters. Therefore, the core of the thesis presents the following stages of work: -- Solution of electromagnetic problem for wave propagation in rectangular waveguide structures; overview of substrate integrated waveguides. -- Review of available design procedures for cross-coupled resonator filters; realization of coupling matrix synthesis methods by optimization. -- Investigation of the possibility to implement filtering modules using E-plane metallo-dielectric inserts in conventional rectangular waveguides. Application of the modules in configurations of bandpass and dual-band filters. Experimental verification of the filters. -- Implementation of inline extracted pole filters using E-plane inserts in rectangular waveguides. Use of generalized coupling coefficients concept for individual or coupled extracted pole sections. Development of new extracted pole sections. Application of the sections in the design of compact cross-coupled filters with improved stopband performance. -- Application of the techniques developed for conventional rectangular waveguides to substrate integrated technology. Development of a new negative coupling structure for folded substrate integrated resonators. Design of improved modular and extracted pole filters using substrate integrated waveguides

Novel compact substrate integrated waveguide resonators at 60 GHz for LCP

In this paper a new approach to design of compact substrate integrated resonators is presented. LCP substrate integrated waveguide is loaded by array of multilayer metallic plates situated inside the substrate. Resonators are designed and simulated with a resonant frequency of 60 GHz. Proposed structures are twice more compact than their conventional substrate integrated counterparts

Hybrid Manufactured Waveguide Resonators and Filters for mm-Wave Applications

Additive and hybrid manufactured waveguide resonators and bandpass filters for mm-wave applications are presented. A Ka band 3D printed waveguide resonator with inductive windows and 28 GHz 5G band hybrid manufactured waveguide resonator and bandpass filter are designed. Hybrid manufacturing combines 3D polymer printing and conventional metal processing technologies. In order to illustrate the accuracy of the design, a 3D printed waveguide transmission line and resonator with the resonant frequency of 33 GHz are fabricated and tested

Ultra Compact Inline E-Plane Waveguide Bandpass Filters Using Cross Coupling

This paper presents novel ultra-compact waveguide bandpass filters that exhibit pseudo elliptic responses with ability to place transmission zeros on both sides of the passband to form sharp roll offs. The filters contain E plane extracted pole sections cascaded with cross-coupled filtering blocks. Compactness is achieved by the use of evanescent mode sections and closer arranged resonators modified to shrink in size. The filters containing non-resonating nodes are designed by means of the generalized coupling coefficients (GCC) extraction procedure for the cross-coupled filtering blocks and extracted pole sections. We illustrate the performance of the proposed structures through the design examples of a third and a fourth order filters with center frequencies of 9.2 GHz and 10 GHz respectively. The sizes of the proposed structures suitable for fabricating using the low cost E plane waveguide technology are 38% smaller than ones of the E plane extracted pole filter of the same order

Compact quasi-ridged resonator for 28 GHz integrated on LCP substrate

In this paper an approach to design a compact substrate integrated resonator is presented. Multilayer LCP substrate integrated waveguide is loaded with a quasi-ridged structure. Component is designed with a resonant frequency of 28 GHz. Proposed structure is 4.5 times more compact by square than its conventional substrate integrated counterpart and 1.7 times than resonator designed using EBG-substrate. Chebyshev filter with proposed resonator is designed; its layout and characteristics are presented

Compact CSRR-loaded substrate integrated waveguide resonators on LCP substrate

In this paper a compact substrate integrated waveguide resonator with CSRRs is presented. LCP substrate integrated waveguide is loaded by periodical arrays of stacked CSRRs at its top and bottom surfaces. Resonators are designed and simulated with a resonant frequency of 9 GHz. Proposed structures are 28% more compact than their conventional substrate integrated counterparts. This is achieved by modification of electromagnetic properties of the waveguide by means of creating artificial media inside the waveguide resonator

Substrate integrated folded-waveguide cross-coupled filter with negative coupling structure

This paper presents a multilayer cross-coupled substrate integrated folded-waveguide filter with pseudo-elliptic power transfer function. The bandpass filter which consists of four resonators has a central frequency of 28 GHz with a passband of 1000 MHz and exhibits adjacent channel selectivity of 25 dB. Design procedure is briefly explained, coupling matrix and coupling scheme are derived, and theoretical transfer function is built. Taking into account a loss correction, simulated results agree well with those obtained theoretically

Compact filters using metal-dielectric inserts

A novel filter based on e-plane metal-dielectric insert in rectangular waveguide is proposed. Properties of the structure containing metallic septa, C- and I-shaped resonators placed in waveguide are investigated. Pseudo-elliptic cross-coupled filter with direct source-load coupling is designed, simulated and fabricated. Experimental results are presented to prove feasibility of the filter. Significant size reduction is achieved

Compact E-plane doublet structures for modular filter design

This paper presents a doublet structure for modular design of pseudo-elliptic microwave filters. Combinations of hairpin resonators etched on slab of dielectric substrate and septum are considered as insertions for conventional rectangular waveguide. Proposed structure is capable of producing two poles and two transmission zeros in upper and lower stopbands. The structure is applied in inline bandpass filter with non-resonating node and dual-band filter in order to prove feasibility of the structure at X-band. Experimental verification of simulated results is carried out