Coaxial probe modeling in waveguides and cavities

Liang, Ji-Fuh; Zaki, K.A.

doi:10.1109/mwsym.1992.187921

Cited by 8 publications

(5 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For instance, standard coaxial cavity filters (either with in-line or folded configurations) and recently proposed orthogonal coaxial filters, all of them typically operating at low-frequency bands (i.e., L-, S-and Cbands), are commonly excited using a collinear end-launcher transition from a coaxial to a rectangular waveguide [Morini et al, 2006[Morini et al, , 2007Höft and Yousif, 2011]. Evanescent-mode filters, in-line filters, and thick-iris waveguide filters [Liang et al, 1992] are also classically fed using a standard (vertical) coaxial excitation. Besides, as it will be discussed afterward, the integration of the coaxial excitation in the input and output waveguides of the structure can be used to raise the order of the designed filter (and then to enhance the response selectivity) without increasing its length.…”

Section: Introductionmentioning

confidence: 99%

Wideband generalized admittance matrix representation for the analysis and design of waveguide filters with coaxial excitation

et al. 2013

View full text Add to dashboard Cite

[1] A very efficient technique for the full-wave analysis and design of complex passive waveguide filters, including rectangular cavities with metallic cylindrical posts and coaxial excitation, is presented. This novel technique provides the wideband generalized admittance matrix representation of the whole structure in the form of pole expansions, thus extracting the most expensive computations from the frequency loop. For this purpose, the structure is properly segmented into its key building blocks, all of them characterized in terms of wideband admittance matrices. Then, an efficient iterative algorithm for combining these matrices, and finally providing the wideband generalized admittance matrix of the complete structure, is followed. In order to validate the accuracy and efficiency of this full-wave modal technique, four different waveguide filters have been considered. In particular, the design of a compact four-pole in-line filter with tuning screws and of an evanescent-mode filter, both operating in the X-band and including a standard (vertical) coaxial excitation, are first presented. Finally, two C-band six-resonator comb-line filters, one of them with a crosscoupling configuration, and both excited with a collinear end-launcher transition based on a disc-ended coaxial, are also designed. Numerical data from a commercial software, as well as measurements of a manufactured prototype, are included for verification purposes.Citation: Mira, F., Á . A. San Blas, V. E. Boria, L. J. Rogla´, and B. Gimeno (2013), Wideband generalized admittance matrix representation for the analysis and design of waveguide filters with coaxial excitation, Radio Sci., 48,

show abstract

Section: Introductionmentioning

confidence: 99%

Wideband generalized admittance matrix representation for the analysis and design of waveguide filters with coaxial excitation

et al. 2013

View full text Add to dashboard Cite

show abstract

“…The external Q value of I/O ports can be calculated using the following formula 18 :

Q_{e} = \frac{f_{0}}{m_{s 1}^{2} \times italicBw},

where f 0 is the center frequency of the filter and Bw is the bandwidth of filter.…”

Section: Design and Analysismentioning

confidence: 99%

Cross‐coupled dielectric waveguide filter

Huang

Cheng

2021

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

A cross‐coupled dielectric waveguide filter based on blind holes and via holes is proposed in this study. Using a unique all‐hole design, a fourth‐order cross‐coupled dielectric waveguide bandpass filter is realized by drilling via holes or blind holes in a square dielectric waveguide, followed by coating the surface with thin metal. Magnetic coupling is realized using two blind holes located symmetrically above and below each other. Further, electrical coupling is realized using a combination of two blind holes located symmetrically above and below each other and an interconnecting via hole. Both types of coupling are analyzed and designed. Moreover, a circular via hole is provided in the middle of the square cavity to suppress the parasitic response of the filter. Coupling debugging holes, resonant debugging holes, and feed holes are realized using shallow blind holes, thereby alleviating the process of manufacturing and debugging. The structure of the designed filter is discussed, simulated, manufactured, and measured. The results show that the proposed filter has a center frequency of 3.5 GHz, an insertion loss of less than 0.5 dB, a return loss of less than 15 dB, and a relative bandwidth of 5%, exhibiting excellent performance that includes two out‐of‐band transmission zeros.

show abstract

“…The SMA probes are soldered to the bottom of the blind holes. Because the probes are placed in the same direction as the electric field of the input/output resonators, it excites the dominant mode inside the resonators and realizes I/O coupling, which is equivalent to waveguide probe excitation theory in principle 14 …”

Section: Filter Design and Analysismentioning

confidence: 99%

Novel dielectric waveguide filter using isosceles right‐angled triangular resonators

Huang

Cheng

Liu

2020

Micro & Optical Tech Letters

View full text Add to dashboard Cite

A novel dielectric waveguide filter based on isosceles right‐angled triangular (RAT) resonators is presented in this letter. By connecting the vertices of four isosceles RAT waveguide cavities, a square fourth‐order cross‐coupled waveguide bandpass filter is formed. The presented filter uses the partition wall and shallow blind hole to realize positive coupling and the deep blind hole to realize negative coupling. Moreover, the filter facilitates debugging and testing by setting the debugging blind hole on one side of the waveguide and setting the feed blind hole on the opposite side. The design, analysis, and simulation of the physical model of the filter are discussed. The fabricated filter has a center frequency of 3.5 GHz, relative bandwidth of 5%, insertion loss of less than 1 dB, in‐band return loss of more than 15 dB, and two out‐of‐band transmission zeros at 3.27 and 3.65 GHz.

show abstract

Coaxial probe modeling in waveguides and cavities

Cited by 8 publications

References 7 publications

Wideband generalized admittance matrix representation for the analysis and design of waveguide filters with coaxial excitation

Wideband generalized admittance matrix representation for the analysis and design of waveguide filters with coaxial excitation

Cross‐coupled dielectric waveguide filter

Novel dielectric waveguide filter using isosceles right‐angled triangular resonators

Contact Info

Product

Resources

About