Reactance of Posts in Circular Waveguide

Zhu, Qian; Williamson, A.G.; Neve, M.J.

doi:10.1109/tmtt.2007.901605

Cited by 20 publications

(9 citation statements)

References 12 publications

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“…In turn, the orthomode transducer separates linearly polarised signals and directs them to two highly isolated waveguide channels [8,9]. The modern designs of polarizers are realized in the form of waveguide structures with irises [10,11,12], ridges [13,14,15,16,17], posts [18,19,20,21,22,23,24], thin metal septums [25,26] and slots [27,28]. The waveguide polarizers with posts and irises operate similarly to the post and iris waveguide phase shifters applied in phased array antennas and other systems [29,30,31,32,33,34,35,36].…”

Section: Introductionmentioning

confidence: 99%

“…Theoretical and experimental investigations of semi-periodic systems and their scattering matrices are performed. Article [19] offers the results of testing and numerical simulation of the reactance of posts in a circular waveguide. The reactance is a function of the waveguide and post dimensions and frequency, and the results presented are useful in the design of a variety of circular waveguide devices.…”

Section: Introductionmentioning

confidence: 99%

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Information Resources Economy in Satellite Systems based on New Microwave Polarizers with Tunable Posts

Piltyay

Bulashenko

Kushnir

et al. 2020

PoS

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One of the fundamental problems of modern digital telecommunications is the economy of digital information and frequency resources, which are highly limited. The introduction of novel telecommunication systems and 5G networks requires searching for principal solutions for the economy and reusing the frequency spectrum. Therefore, modern wireless mobile, terrestrial, and satellite systems use various new technologies to increase communication channels' information capacity for the economy of limited frequency resources. One of the most effective ways to reuse the information system's operating frequency band is to apply antennas with polarisation signal processing. Such systems provide the possibility to transmit and to receive simultaneously signals with different types of polarisation. Consequently, the application of electromagnetic waves with two orthogonal polarisations improves wireless systems' information characteristics for various purposes. This allows doubling the information capacity of mobile, terrestrial, and satellite communication channels. Also, polarisation processing is carried out in meteorological and radar systems to receive, transmit, and process information. The essential elements of such systems are microwave polarisers and orthomode transducers. The electromagnetic characteristics of these devices affect the aspects of the whole system significantly. Main electromagnetic factors include phase, matching, and polarisation parameters. The article presents the development of a compact tunable polarizer based on a square waveguide with three posts. The developed polariser operates in the X-band from 8.0 GHz to 8.5 GHz. Created a mathematical model of the polariser is based on the scattering and transmission matrices. To verify the developed theoretical model's correctness, the calculation of all characteristics was also performed numerically using the finite integration technique. The developed compact polariser based on a square waveguide with three posts allows tuning it's matching and polarisation characteristics by changing all posts' heights. The developed polariser's main advantages are small dimensions, tuning options, and aspects of polarisation transformation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Information Resources Economy in Satellite Systems based on New Microwave Polarizers with Tunable Posts

Piltyay

Bulashenko

Kushnir

et al. 2020

PoS

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“…Various techniques have been used to analyze and model metallic posts in uniform rectangular and circular waveguides [11][12][13][14][15]. In the spite of enormous references available in literature on the analysis of post discontinuities in waveguides and T-Junctions, each proposed method has its own limitations.…”

Section: Introductionmentioning

confidence: 99%

Full-wave analysis of H-plane waveguide junction loaded with metallic posts

Rezaiesarlak¹,

Mehrshahi²

2011

Int J RF and Microwave Comp Aid Eng

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A hybrid method that combines moment method and mode matching technique is presented to study H-Plane waveguide discontinuity loaded with metallic posts at the junction of two waveguides. By expanding Eigen modes in waveguides, applying continuity of tangential fields at the discontinuity and finally nulling the tangential electric field on the post surface, a system of algebraic equations is solved to obtain current distribution on the posts and consequently scattering parameters of the structure. Then, as an application, an in-line dual-mode rectangular waveguide bandpass filter is analyzed using the proposed method along with generalized scattering matrix method. The numerical results are in good agreement with existing full wave finite element method in high frequency structure simulator (HFSS) results and measurements.

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“…Circular waveguide on the other hand, notwithstanding its unique advantages: e.g., rotationally symmetric property, easy manufacturability and reduced cost for custom construction, has received much less attention in the past and is only used in limited applications. An impediment in using circular waveguide is the dearth of design information available for elementary circular waveguide devices (such as coaxial line-to-waveguide transitions and reactive obstacles [1][2][3]), in contrast to the well-established rectangular waveguide (e.g., [4][5][6][7][8]). …”

Section: Introductionmentioning

confidence: 99%

“…The easy accessibility and applicability may promote wider applications using circular waveguides. A recent contribution using this approach is the characterisation of reactive posts [3]. This paper reports initial results for coaxial line-to-circular waveguide transitions, the aim being to identify transition parameters that achieve a low VSWR result.…”

Section: Introductionmentioning

confidence: 99%

Design of coaxial line-to-circular waveguide transitions

Zhu

Williamson

Neve

2009

2009 IEEE MTT-S International Microwave Symposium Digest

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Coaxial line-to-circular waveguide transitions are characterised by numerical modelling supported by experimental verification. Various coaxial line to waveguide diameter ratios have been considered, and the effects of parameter variations have been studied. It has been found that both narrowband matching at a specific frequency and broadband matching over the entire operating frequency band can be achieved. The optimum parameters for such transitions are reported.

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Reactance of Posts in Circular Waveguide

Cited by 20 publications

References 12 publications

Information Resources Economy in Satellite Systems based on New Microwave Polarizers with Tunable Posts

Information Resources Economy in Satellite Systems based on New Microwave Polarizers with Tunable Posts

Full-wave analysis of H-plane waveguide junction loaded with metallic posts

Design of coaxial line-to-circular waveguide transitions

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