Novel Microwave Filter Design Techniques

Adams, D.K.; Robinson, L. A.; Karp, A.; Cristal, E.G.; Young, L.

doi:10.21236/ad0409448

Cited by 10 publications

(4 citation statements)

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“…To model an evanescent waveguide, we can use the inductive π -circuit model, as shown in Fig. 15(c) [2]. The elements of the distributed model can be calculated based on a real propagating constant k and an imaginary impedance Z 0 = jX 0 .…”

Section: Discussionmentioning

confidence: 99%

“…The main drawback of waveguide filters is their large volume and high weight due to the size of their constitutive waveguide cavities, which directly scale with the operating wavelength (λ). These cavities are coupled using E-plane or H -plane irises, stubs, or posts [2][3][4]. Among various efforts to make microwave filters smaller, coaxial combline filters [4] and evanescent waveguide filters [5] have established themselves as compact microwave filters for space applications, respectively, with coaxial and waveguide interfaces.…”

Section: Introductionmentioning

confidence: 99%

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Subwavelength Metawaveguide Filters and Metaports

Moghaddam

Fleury

2021

Phys. Rev. Applied

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This paper proposes an alternative technique for the design of miniaturized waveguide filters based on locally resonant metamaterials (LRMs). We implement ultrasmall metamaterial filters (metafilters) by exploiting a subwavelength (sub-λ) guiding mechanism in evanescent hollow waveguides, which are loaded by small resonators. In particular, we use composite pin-pipe waveguides (CPPWs) built from a hollow metallic pipe loaded by a set of resonant pins, which are spaced by deep-subwavelength distances. We demonstrate that, in such structures, multiple resonant scattering nucleates a sub-λ mode with a customizable bandwidth below the induced hybridization band gap (HBG) of the LRM. The sub-λ guided mode and the HBG, respectively, induce pass and rejection bands in a finite-length CPPW, creating a filter, the main properties of which are largely decoupled from the specific arrangement of the resonant inclusions. To guarantee compatibility with existing technologies, we propose a subwavelength method to match the small CPPW filters to standard waveguide interfaces, which we call a metaport. Finally, we build and test a family of low-and high-order ultracompact aluminum CPPW filters in the X and K u bands (10-18 GHz). Our measurements demonstrate the customizability of the bandwidth and the robustness of the passband against geometrical scaling. The three-dimensional printed prototypes, which are 1 order of magnitude smaller and lighter than traditional filters and are also compatible with standard waveguide interfaces, may find applications in future satellite systems and 5G infrastructures.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Subwavelength Metawaveguide Filters and Metaports

Moghaddam

Fleury

2021

Phys. Rev. Applied

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“…10, and M and P are natural numbers. As it can be noticed, the length of dielectric sections should be equal to the multiple of the half of the wavelength, while air gap sections should function as impedance inverters, so their length is quarter of the wavelength (or its odd multiple) [20]. Subsequently, the relation between the number of dielectric sections N and a passband width has been evaluated for various values of the refractive index of dielectric material (see Fig.…”

Section: Electromagnetic Synthesis Of Coupled Cavitiesmentioning

confidence: 99%

Passive synthesis rules of coupled-cavity quantum cascade lasers

Krysicki¹,

Salski²,

Kopyt³

2019

Opto-Electronics Review

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A new approach to passive electromagnetic modelling of coupled-cavity quantum cascade lasers is presented in this paper. One of challenges in the rigorous analysis of such eigenvalue problem is its large size as compared to wavelength and a high quality factor, which prompts for substantial computational efforts. For those reasons, it is proposed in this paper to consider such a coupled-cavity Fabry-Perot resonant structure with partially transparent mirrors as a two-port network, which can be considered as a deterministic problem. Thanks to such a novel approach, passive analysis of an electrically long laser can be split into a cascade of relatively short sections having low quality factor, thus, substantially speeding up rigorous electromagnetic analysis of the whole quantum cascade laser. The proposed method allows to determine unequivocally resonant frequencies of the structure and the corresponding spectrum of a threshold gain. Eventually, the proposed method is used to elaborate basic synthesis rules of coupled-cavity quantum cascade lasers.

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“…Among a large variety of electromagnetic resona tors used at frequencies from several hundred mega hertz to several gigahertz, metal-dielectric resonators (also called coaxial dielectric resonators [7][8][9]) find increasing application in recent years. Filters based on these resonators are among the best with respect to the combination of characteristics.…”

mentioning

confidence: 99%