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Journal articles on the topic 'Rectangular waveguide'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

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1

Deng, Jian Qin, Wan Shun Jiang, and Yue Min Ning. "Analysis and Design of a Novel High-Power W-Band Spatial Multilayer Doubler." Applied Mechanics and Materials 130-134 (October 2011): 529–33. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.529.

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A novel spatial multilayer doubler is proposed in the paper. It is designed by tray approach in rectangular waveguide. The doubler consists of multilayer multiplier circuits, which are parallel each other. Comparing with traditional single layer doubler, the spatial multilayer doubler has higher 1dB compression point, so the output power can be increased when input power is increased. Both the input port and the output port of the doubler are rectangular waveguides. In order to achieve the transition from rectangular waveguide to planar circuit, the finline and ridge are used. Multilayer finlines act as divider, which couple power from input rectangular waveguide. Otherwise, multilayer ridges act as combiner, which combine the harmonic power to output rectangular waveguider. The passive circuits of the spatial multilayer doubler are modeled and analyzed with FDTD method. From the results, we can see that the passive circuits designed in the paper have very low insertion loss.

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2

Berdnik, Sergey L., Victor A. Katrich, Mikhail V. Nesterenko, and Yuriy M. Penkin. "Waveguide T-junctions with resonant coupling between sections of different dimensions." International Journal of Microwave and Wireless Technologies 9, no. 5 (November 23, 2016): 1059–65. http://dx.doi.org/10.1017/s175907871600129x.

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Electromagnetic characteristics of the E-plane T-junction for two rectangular waveguides using resonant coupling between the waveguide sections were studied by mathematical modeling. The problem of coupling between infinite and semi-infinite rectangular waveguides through a resonant slot in the end-wall of the semi-infinite waveguide in the presence of resonant monopole is solved in a strict electrodynamic formulation. The monopole with variable surface impedance is placed parallel to the narrow walls at an arbitrary position inside the infinite waveguide. The problem is solved analytically by the generalized method of induced electro-magneto-motive forces. Impedance vibrator inclusions with variable electro-physical parameters have been analyzed as control elements for waveguide junctions. To this purpose energy characteristics of the junction in the single-mode regime of the both waveguides, and also in multi-mode regime of the semi-infinite waveguide is investigated. The results may be useful for development of variety antennas and waveguide devices, which involves waveguide junctions.

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3

Krutskikh, V. V., A. Yu Sizyakova, M. S. Minkara, A. R. Ibrahim, A. E. Mirzoyan, and A. N. Ushkov. "Broadband Metal-Dielectric Waveguide Path with Low Losses in the EHF Range." Rocket-space device engineering and information systems 8, no. 3 (2021): 89–98. http://dx.doi.org/10.30894/issn2409-0239.2021.8.3.89.98.

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. The present paper is devoted to the design of a new shielded metal-dielectric waveguide with low losses (less than 0.5 dB/m) and wide bandwidth for the 90–100 GHz frequency range. Various types of waveguide structures were analyzed, such as metal waveguides, oversized metal waveguides, dielectric waveguides, dielectric waveguides with a metal shield and various designs of the dielectric filling element. Estimates of loss per unit length in them are obtained. The design of a waveguide containing an oversized round metal screen and a dielectric element consisting of a plate and a rod, located in the center of symmetry of the device, is proposed. The task of creating a transition from the investigated waveguide to a standard rectangular metal waveguide is considered. It is a horn transition from a circular cross-section to a rectangular one with a length of more than 25 wavelengths with a dielectric structure continuing the dielectric element of the waveguide path. As a result of the work, the ratios of the dimensions of the structural elements of the waveguide path and the materials used were obtained that satisfy the required losses.

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4

Mortazy, Ebrahim, Alireza Hassani, Francois Legare, Ke Wu, and Mohamed Chaker. "Multilayer porous waveguide for microwave low-loss applications." International Journal of Microwave and Wireless Technologies 3, no. 4 (May 18, 2011): 459–63. http://dx.doi.org/10.1017/s1759078711000596.

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A novel waveguide called multilayer porous waveguide (MPW) is proposed as microwave low-loss transmission lines. MPW is a fully rectangular dielectric waveguide composed of several periodically rectangular air gaps in a bulk dielectric that can be easily formed by placing several dielectric substrates in interval with air gaps. The loss and propagating characteristics of both TE and TM modes in MPW are studied. The TE mode confined in the air gaps has a lower loss than the TM mode spread out in air gaps and dielectric; however, the loss of TM mode is still less than that of conventional microwave waveguides. Finally, MPW is an artificial material with desirable electrical permittivity and loss that can be used in structure of conventional waveguides.

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5

YOON, KEUN BYOUNG, BYEONG-SOO BAE, and MICHAEL POPALL. "FABRICATION OF LOW-LOSS WAVEGUIDES USING ORGANIC-INORGANIC HYBRID MATERIALS." Journal of Nonlinear Optical Physics & Materials 14, no. 03 (September 2005): 399–407. http://dx.doi.org/10.1142/s0218863505002852.

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The fabrication of single and multimode waveguides and optical characteristics were investigated. The singlemode waveguide was fabricated by a laser direct writing technique and a multimode waveguide was produced by means of a direct UV patterning technique using organic-inorganic hybrid materials. The fabrication of waveguide channels with these techniques are of interest for simple processes. The resulting single and multimode waveguides exhibited a near rectangular shape and low optical loss. The average propagation losses of these waveguides were 0.07 dB/cm (at 850 nm) and 0.3 dB/cm (at 1310 nm), respectively.

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6

Pochernyaev, V. N., and N. M. Syvkova. "EXTERNAL PARAMETERS OF THE CONNECTION OF A RECTANGULAR WAVEGUIDE PARTIALLY FILLED OF LINEAR DIELECTRIC WITH A RECTANGULAR WAVEGUIDE PARTIALLY FILLED OF NONLINEAR DIELECTRIC." Visnyk Universytetu “Ukraina”, no. 1 (28) 2020 (2020): 100–105. http://dx.doi.org/10.36994/2707-4110-2020-1-28-09.

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. In the article, the external parameters of the connection of a rectangular waveguide partially filled of linear dielectric with a rectangular waveguide partially filled of a nonlinear dielectric are determined. Knowledge of the external parameters of such a connection ensures the design of devices with open nonlinear elements. Promising microwave paths of radio engineering systems based on rectangular waveguides partially filled of dielectric include a wide variety of active and passive microwave devices. The plane-transverse junction of these waveguides is considered for various geometric dimensions of dielectric plates and their relative permittivity. Such a junction is characterized by reactive conductivity, which is determined through the sum of the reactive conductivities of local fields. The transverse electric field at the junction is represented through the eigenvector function of the geometric surface, which coincides with the cross section of the waveguides. The scattering matrix of the plane-transverse junction is determined through the conductivity of the sections of the two waveguides and the conductivity of the plane-transverse junction. The dependences of the traveling wave coefficient and the modulus of the reflection coefficient on the geometric dimensions of the dielectric plate are plotted taking into account the local fields generated at the plane transverse junction. At the junction of two waveguides, not only changed the geometric dimensions of the dielectric plates along the wide and narrow walls of the waveguide, but also their relative permittivity. In one case, two higher types of waves were taken into account: quasi - H30 and quasi - H12, in the other case - four higher types of waves: quasi - H30, quasi - H12, quasi - E12, quasi - H50. Calculations show that an increase in the number of higher types of waves has practically no effect on the accuracy of calculations. The results obtained indicate the rapid internal convergence of the obtained solutions and the correct choice of the transverse electric eigenvector function of rectangular waveguides partially filled of dielectric as approximate the field on the junction of two waveguides.

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7

Deng, Xida, Ge Dong, Xuan Dai, and Jinxiang Deng. "Compact Full Ka-Band Waveguide Directional Coupler Based on Rectangular Aperture Array with Stairs." Micromachines 12, no. 7 (June 25, 2021): 745. http://dx.doi.org/10.3390/mi12070745.

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This article presents a compact 3 dB waveguide directional coupler with full waveguide bandwidth. It consists of a pair of rectangular waveguides with stairs structures in the coupling region. The waveguides are placed parallel to each other along their broad wall, which has a rectangular aperture array. The compact size, broad bandwidth, good in-band coupling flatness, and good return loss are achieved by using the proposed structure. For verification purposes, a prototype of the proposed coupler was designed, manufactured, and measured. The experimental results show that over the full waveguide bandwidth a return loss of input port better than 17.46 dB, coupling strength varying between −2.74 dB and −3.80 dB, power-split unbalance within 0.76 dB, and an isolation better than 20.82 dB were obtained. The length of the coupling region was only 15.82 mm.

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8

Faryad, Muhammad, and Qaisar Abbas Naqvi. "FRACTIONAL RECTANGULAR WAVEGUIDE." Progress In Electromagnetics Research 75 (2007): 383–96. http://dx.doi.org/10.2528/pier07052803.

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9

Uranus, Henri P., and B. M. A. Rahman. "Low-loss ARROW waveguide with rectangular hollow core and rectangular low-density polyethylene/air reflectors for terahertz waves." Journal of Nonlinear Optical Physics & Materials 27, no. 03 (September 2018): 1850029. http://dx.doi.org/10.1142/s0218863518500297.

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Designing low-loss waveguides for terahertz waves is challenging as most materials are very lossy in this frequency band. Most scientists simply consider transmitting the waves through low-loss air, which however also has its own difficulties as index-guiding is not possible. In this paper, we report on the design of low-loss waveguides for terahertz waves and associated results by using a finite element leaky mode solver. These results show that waveguides designed using ARROW (anti-resonant reflecting optical waveguide) approach yield a low combined absorption and leakage loss down to only 0.05[Formula: see text]dB/cm for the q-TE[Formula: see text] fundamental mode using realistic values of refractive index at 1 THz operating frequency. The structure employs rectangular hollow-core and low-density polyethylene/air anti-resonant reflecting bilayers, which can be easily fabricated. These results are compared with those of other structures, i.e., a photonic crystal fiber-like structures using the same materials with rectangular holes, which is shown to give a higher loss of 3[Formula: see text]dB/cm and a suspended air-core waveguide with TOPAS vein offering a loss of 1[Formula: see text]dB/cm.

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10

Marinescu, Nicolae, and Rudolf Nistor. "Quantum Features of Microwave Propagation in a Rectangular Waveguide." Zeitschrift für Naturforschung A 45, no. 8 (August 1, 1990): 953–57. http://dx.doi.org/10.1515/zna-1990-0803.

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AbstractThe formal analogy between the distribution of the electromagnetic field in waveguides and microwave cavities and quantum mechanical probability distributions is put into evidence. A waveguide of a cut-off frequency ωc acts on an electromagnetic wave as a quantum potential barrier Ug = hωc. A non-habitual time independent Schrödinger equation, describing guided wave propagation, is established

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11

Pérez-Escudero, José M., Alicia E. Torres-García, Ramón Gonzalo, and Iñigo Ederra. "A Gap Waveguide-Based Compact Rectangular Waveguide to a Packaged Microstrip Inline Transition." Applied Sciences 10, no. 14 (July 20, 2020): 4979. http://dx.doi.org/10.3390/app10144979.

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In this paper two different simple to design and easy to manufacturing transitions from a microstrip to rectangular waveguide based on ridge and groove gap waveguides are studied. The first one is based on a combination of a groove and ridge gap waveguide. In this case, the microstrip substrate occupies the whole bottom metallic housing block, namely, the transition and the gap between the bed of nails and the lid; therefore, it does not require any substrate shaping. Nevertheless, the transition needs to replace groove waveguide by ridge gap waveguide sections to avoid higher-order mode excitation. In the second approach, based on only a groove gap waveguide, the substrate is shaped to be only in the microstrip section, that is, outside the bed of nails area. This leads to a simplification of the design procedure. Prototypes of both transitions have been characterized, showing good agreement with the simulations taking into account the manufacturing tolerances. Performance comparable to the state-of-the-art in this frequency band has been achieved.

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12

Shao, Yi Quan, and Yun Bo Zhang. "The Transmission Characteristics of Lord Mode and Analysis on Section Dimension Design in Rectangle Wave Guide." Applied Mechanics and Materials 325-326 (June 2013): 490–93. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.490.

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In order to design the section size of a rectangular waveguide, this paper gives a new method to design the section size of a rectangular waveguide and the result obtained has important reference value for the design and research of sectional dimension. Based on the wave equation of electromagnetic wave, graphic method is employed to determine the transmission condition of fundamental mode in rectangular waveguide. We analyzed the power capacity and attenuation characteristics when the rectangular waveguide transmits with single-mode, and finally obtain the guidance condition for the power capacity reaches the maximum and the attenuation reaches the minimum in the rectangular waveguide.

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13

Fanti, A., G. Mazzarella, and G. Montisci. "Curvilinear vector finite difference approach to the computation of waveguide modes." Advanced Electromagnetics 1, no. 1 (July 2, 2012): 29. http://dx.doi.org/10.7716/aem.v1i1.45.

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We describe here a Vector Finite Difference approach to the evaluation of waveguide eigenvalues and modes for rectangular, circular and elliptical waveguides. The FD is applied using a 2D cartesian, polar and elliptical grid in the waveguide section. A suitable Taylor expansion of the vector mode function allows to take exactly into account the boundary condition. To prevent the raising of spurious modes, our FD approximation results in a constrained eigenvalue problem, that we solve using a decomposition method. This approach has been evaluated comparing our results to the analytical modes of rectangular and circula rwaveguide, and to known data for the elliptic case.

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14

Baghchehsaraei, Zargham, Umer Shah, Jan Åberg, Göran Stemme, and Joachim Oberhammer. "MEMS reconfigurable millimeter-wave surface for V-band rectangular-waveguide switch." International Journal of Microwave and Wireless Technologies 5, no. 3 (April 23, 2013): 341–49. http://dx.doi.org/10.1017/s1759078713000378.

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This paper presents for the first time a novel concept of a microelectromechanical systems (MEMS) waveguide switch based on a reconfigurable surface, whose working principle is to block the wave propagation by short-circuiting the electrical field lines of the TE10 mode of a WR-12 rectangular waveguide. The reconfigurable surface is only 30 µm thick and consists of up to 1260 micromachined cantilevers and 660 contact points in the waveguide cross-section, which are moved simultaneously by integrated MEMS comb-drive actuators. Measurements of fabricated prototypes show that the devices are blocking wave propagation in the OFF-state with over 30 dB isolation for all designs, and allow for transmission of less than 0.65 dB insertion loss for the best design in the ON-state for 60–70 GHz. Furthermore, the paper investigates the integration of such microchips into WR-12 waveguides, which is facilitated by tailor-made waveguide flanges and compliant, conductive-polymer interposer sheets. It is demonstrated by reference measurements where the measured insertion loss of the switches is mainly attributed to the chip-to-waveguide assembly. For the first prototypes of this novel MEMS microwave device concept, the comb-drive actuators did not function properly due to poor fabrication yield. Therefore, for measuring the OFF-state, the devices were fixated mechanically.

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15

Hussain, Akhtar, and Qaisar Abbas Naqvi. "FRACTIONAL RECTANGULAR IMPEDANCE WAVEGUIDE." Progress In Electromagnetics Research 96 (2009): 101–16. http://dx.doi.org/10.2528/pier09060801.

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16

Dong, Tian-lin, and Ping Chen. "Doubly periodic rectangular waveguide." Microwave and Optical Technology Letters 48, no. 11 (2006): 2277–80. http://dx.doi.org/10.1002/mop.21928.

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17

Shelkovnikov, Alexander, and Djuradj Budimir. "Miniaturized rectangular waveguide filters." International Journal of RF and Microwave Computer-Aided Engineering 17, no. 4 (July 2007): 398–403. http://dx.doi.org/10.1002/mmce.20238.

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18

Trubin, Alexander. "MUTUAL COUPLING COEFFICIENTS OF ROTATING RECTANGULAR DIELECTRIC RESONATORS IN CUT-OFF RECTANGULAR WAVEGUIDE." Information and Telecommunication Sciences, no. 1 (June 29, 2021): 48–54. http://dx.doi.org/10.20535/2411-2976.12021.48-54.

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Background. A further increase in the speed of information transfer is determined by more stringent requirements for the elements of communication devices. One of the most important components of such devices is various filters, which are often made on the basis of dielectric resonators. Calculation of the parameters of multi-section filters is impossible without further development of the theory of their design. The development of filter theory is based on electrodynamic modelling, which involves calculating the coupling coefficients of dielectric resonators in various transmission lines. Objective. The aim of the research is to calculate and study the coupling coefficients of rectangular dielectric resonators with a rectangular metal waveguide when their axes rotate. Investigation of new effects to improve the performance of filters and other devices based on them. Methods. Methods of technical electrodynamics are used to calculate and analyse the coupling coefficients. The end result is to obtain new analytical formulas for new structures with rectangular dielectric resonators, which make it possible to analyse and calculate their coupling coefficients. Results. New analytical expressions are found for the coupling coefficients of dielectric resonators with the rotation of their axes in a rectangular waveguide. Conclusions. The theory of designing filters based on new structures of dielectric resonators with rotation of their axes in metal waveguides has been expanded. New analytical relationships and new patterns of change in the coupling coefficients are found. Keywords: dielectric filter; rectangular dielectric resonator; rotation; coupling coefficients.

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19

Chakrabarty, Soumyabrata, Vijay Kumar Singh, and Shashi Bhusan Sharma. "Dual frequency coaxial rotary joint with multi-stepped transition." International Journal of Microwave and Wireless Technologies 2, no. 2 (April 2010): 219–24. http://dx.doi.org/10.1017/s1759078710000127.

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The present paper presents the design and development of a dual-channel microwave rotary joint using coaxial waveguide as primary waveguide and rectangular waveguide as the secondary waveguide. Design is presented at 5.85–7.02 GHz with 20% bandwidth and at 14–14.5 GHz bands with 3.6% bandwidth using dual channel mode transducers exciting transverse electromagnetic (TEM) mode in the coaxial waveguide. Rectangular to coaxial waveguide transitions employing multi-stepped doorknob transitions are used to excite the TEM mode from the rectangular waveguide. The measured results for electrical parameters such as return loss, insertion loss of the dual-channel rotary joint are presented with 360° rotation of the rotary part with respect to the stator part.

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20

Gatti, Roberto Vincenti, Riccardo Rossi, and Marco Dionigi. "Broadband Right-Angle Rectangular Waveguide to Substrate Integrated Waveguide Transition with Distributed Impedance Matching Network." Applied Sciences 9, no. 3 (January 23, 2019): 389. http://dx.doi.org/10.3390/app9030389.

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A broadband right-angle rectangular waveguide to substrate integrated waveguide transition for hybrid RWG-SIW (rectangular waveguide–substrate integrated waveguide) feeding networks is presented. The narrower return loss bandwidth issue with respect to in-line configurations is addressed with the introduction of a multi-section matching network consisting of a number of symmetric E-plane irises in the rectangular waveguide section. A hybrid design procedure based on circuit simulation and full-wave optimization is outlined and adopted to synthesize three matching networks with respectively one, two, and three irises, according to the bandwidth to be covered. The design procedure is experimentally validated with a proof-of-concept prototype.

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21

Che, Wenquan, Xiaojing Ji, and Ke Wu. "Characteristics comparison of substrate-integrated rectangular waveguide (SIRW) and its equivalent rectangular waveguide." Microwave and Optical Technology Letters 46, no. 6 (2005): 588–92. http://dx.doi.org/10.1002/mop.21059.

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22

Che, Wenquan, Dapeng Wang, and Kuan Deng. "Equivalence between substrate-integrated rectangular waveguide (SIRW) bend and rectangular waveguide (RW) bend." Microwave and Optical Technology Letters 48, no. 8 (May 30, 2006): 1487–91. http://dx.doi.org/10.1002/mop.21739.

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23

Jasmine, P. M., P. Abdulla, and P. M. Raphika. "Rectangular waveguide fed DRA using tapered waveguide section." Microwave and Optical Technology Letters 57, no. 9 (June 26, 2015): 2025–28. http://dx.doi.org/10.1002/mop.29255.

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24

Simons, R. N., and S. R. Taub. "New coplanar waveguide to rectangular waveguide end launcher." Electronics Letters 28, no. 12 (1992): 1138. http://dx.doi.org/10.1049/el:19920717.

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25

Guellil, N., F. Djahli, and C. Zebiri. "A new formula for the optimum width of Substrate Integrated Waveguide." Advanced Electromagnetics 8, no. 4 (September 7, 2019): 39–43. http://dx.doi.org/10.7716/aem.v8i4.1108.

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A new formula for calculating the optimum width of a Substrate Integrated Waveguide (SIW) corresponding to the first mode is presented in this paper. Finite Difference Frequency Domain (FDFD) method is applied to analyze the waveguide structure where geometrical parameters of the SIW are iteratively varied in order to minimize the gap between cutoff frequencies of SIW structure and that of an equivalent conventional rectangular waveguide. Adequate parameters are used to derive the new formula. To verify the accuracy of the new formula, several waveguides are designed and analyzed using the commercial software HFSS. The calculated propagation constants are compared with experimental measurements from literature, a very good conformity is obtained.

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26

Biryukov, Vladimir, Vladimir Grachev, Ekaterina Karakozova, Sergey Lobin, and Vladimir Shcherbakov. "Estimation of losses per unit length in a rectangular waveguide with rough screening surfaces based on the concept of partial waves." ITM Web of Conferences 30 (2019): 07001. http://dx.doi.org/10.1051/itmconf/20193007001.

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A method for calculating the rough surface reflection coefficient of an electromagnetic wave is proposed. It is shown that the screening surface roughness in waveguides is equivalent to a decrease in conductivity of these surfaces in comparison with values belonging to Schukin-Leontovich boundary conditions for completely smooth surfaces. Examples of calculating the attenuation coefficient in the rectangular waveguide with rough screening surfaces in a terahertz frequency range are presented. The influence of the size and shape of the rough surface profile irregularities on the waveguide attenuation is studied.

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27

Ilin, N. V., A. I. Smirnov, and I. G. Kondratiev. "Metamaterial layer in rectangular waveguide." Physics of Wave Phenomena 18, no. 4 (December 2010): 277–83. http://dx.doi.org/10.3103/s1541308x10040084.

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28

Hunter, J. D., and P. I. Somlo. "Rectangular waveguide characterization for reflectometry." IEEE Transactions on Instrumentation and Measurement 37, no. 3 (1988): 439–43. http://dx.doi.org/10.1109/19.7471.

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29

Hsien-Shun Wu and C. K. C. Tzuang. "Artificially integrated synthetic rectangular waveguide." IEEE Transactions on Antennas and Propagation 53, no. 9 (September 2005): 2872–81. http://dx.doi.org/10.1109/tap.2005.854523.

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30

Rajo-Iglesias, Eva, Óscar Quevedo-Teruel, and Malcolm Ng Mou Kehn. "Multiband SRR Loaded Rectangular Waveguide." IEEE Transactions on Antennas and Propagation 57, no. 5 (May 2009): 1571–75. http://dx.doi.org/10.1109/tap.2009.2016799.

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31

Klymyshyn, David M., Dai Qiu, and Protap Pramanick. "Cross-ridge trough rectangular waveguide." Microwave and Optical Technology Letters 31, no. 1 (2001): 20–23. http://dx.doi.org/10.1002/mop.1345.

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32

Vale, C. A. W., and P. Meyer. "Modal transforms in rectangular waveguide." Electronics Letters 36, no. 16 (2000): 1350. http://dx.doi.org/10.1049/el:20000901.

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33

Menon, V. J., S. Bhattacharjee, and K. K. Dey. "The rectangular dielectric waveguide revisited." Optics Communications 85, no. 5-6 (October 1991): 393–96. http://dx.doi.org/10.1016/0030-4018(91)90570-4.

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34

Meschino, S., S. Ceccuzzi, F. Mirizzi, L. Pajewski, G. Schettini, J. F. Artaud, Y. S. Bae, et al. "Bends in oversized rectangular waveguide." Fusion Engineering and Design 86, no. 6-8 (October 2011): 746–49. http://dx.doi.org/10.1016/j.fusengdes.2010.11.010.

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35

Soleimani, Hasan, Noorhana Yahya, Zulkifly Abbas, Hojjatollah Soleimani, and Hasnah Mohd Zaid. "Determination Reflection and Transmission Coefficients of Lanthanum Iron Garnet Filled PVDF-Polymer Nanocomposite Using Finite Element Method Modeling at Microwave Frequencies." Journal of Nano Research 21 (December 2012): 151–57. http://dx.doi.org/10.4028/www.scientific.net/jnanor.21.151.

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In our previous work, the lanthanum iron garnet-filled PVDF-polymer nanocomposite has been prepared. The reflection and transmission coefficients of PVDF/LIG were measured using rectangular waveguide in conjunction with a microwave vector network analyzer (VNA) at X-band frequencies (8 GHz - 12 GHz). In this study, the distribution of electric field intensity of PVDF/ LIG which was loaded in rectangular waveguide was simulated based on Finite Element Method (FEM) formulation to show the essential differences of intensity of emitted electrical field. The computations of reflection and transmission coefficients of PVDF/ LIG were determined by using implementation FEM modeling rectangular waveguide. The FEM results were compared with the experimental achievement results using the rectangular waveguide. An excellent agreement between measured and simulated results was obtained based on the values of mean relative errors.

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36

Kažys, Rymantas, Egidijus Žukauskas, Liudas Mažeika, and Renaldas Raišutis. "Propagation of Ultrasonic Shear Horizontal Waves in Rectangular Waveguides." International Journal of Structural Stability and Dynamics 16, no. 08 (August 25, 2016): 1550041. http://dx.doi.org/10.1142/s0219455415500418.

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The aim of this paper is to investigate the propagation of ultrasonic shear horizontal guided waves along waveguides with a rectangular cross-section and with a finite constant and variable width and to determine the peculiarities of propagation of those waves. The dispersion curves of guided waves in finite-width waveguides were modeled by using a semi-analytical finite element (SAFE) technique. The propagation of pulsed shear horizontal ultrasonic guided waves was investigated numerically by using 3D finite element modeling. It was found that in the case of finite-width waveguides, the SH0 shear horizontal wave splits into a family of SH-type dispersive modes propagating with different phase velocities. It was also found that the number of propagating modes depends on the width-to-thickness ratio. The first time spatial distributions of pulsed displacements across the waveguide were determined for waveguides of different widths. Investigation of the waveguides with a rectangular cross-section and varying lateral dimensions was performed. It was found that by properly selecting the geometry of the transient zone of waveguides with a rectangular cross-section, it is possible to improve the performance of such waveguides, e.g. to increase the amplitude of the transmitted pulse type signal without significant distortions of the waveforms.

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37

Che, W., D. Wang, Y. L. Chow, and K. Deng. "Analytical equivalence between substrate-integrated waveguide and rectangular waveguide." IET Microwaves, Antennas & Propagation 2, no. 1 (February 1, 2008): 35–41. http://dx.doi.org/10.1049/iet-map:20060283.

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38

Mottonen, V. S., and A. V. Raisanen. "Novel Wide-Band Coplanar Waveguide-to-Rectangular Waveguide Transition." IEEE Transactions on Microwave Theory and Techniques 52, no. 8 (August 2004): 1836–42. http://dx.doi.org/10.1109/tmtt.2004.831580.

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Tao Shen, K. A. Zaki, and T. G. Dolan. "Rectangular waveguide diplexers with a circular waveguide common port." IEEE Transactions on Microwave Theory and Techniques 51, no. 2 (February 2003): 578–82. http://dx.doi.org/10.1109/tmtt.2002.807811.

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Li, J., G. Wen, and F. Xiao. "Broadband transition between rectangular waveguide and substrate integrated waveguide." Electronics Letters 46, no. 3 (2010): 218. http://dx.doi.org/10.1049/el.2010.2518.

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Yamamoto, Y., K. Fujisawa, T. Takemura, and S. Kita. "A dielectric rod waveguide coupled with metal rectangular waveguide." International Journal of Infrared and Millimeter Waves 9, no. 1 (January 1988): 29–40. http://dx.doi.org/10.1007/bf01010619.

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Dong, Ya Zhou, Shi Wei Dong, Zhong Bo Zhu, and Ying Wang. "Ka Band Transition between Rectangular Waveguide and Substrate Integrated Waveguide." Advanced Materials Research 443-444 (January 2012): 362–65. http://dx.doi.org/10.4028/www.scientific.net/amr.443-444.362.

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This paper presents novel designs of Ka band transitions between standard rectangular waveguide and substrate integrated waveguide (SIW). The proposed transitions can provide simultaneous field and impedance matching. The transition with a height-tapered waveguide exhibits outstanding low-loss performance over an ultra-wideband range (entire Ka-band). And the other one with Chebyshev transformers has a compact profile and low loss better than 2dB in a bandwidth of 11GHz at Ka band. The simulation and analysis of the transitions are carried out with Ansoft HFSS.

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Mital, P. Bhushan. "Broadband Waveguide Feed for Parabolic Reflectors." Active and Passive Electronic Components 17, no. 1 (1994): 9–19. http://dx.doi.org/10.1155/1994/53036.

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The broadband requirement in microwave systems has necessitated attention on components that can operate over frequency ranges far broader than those of standard rectangular waveguides. This paper describes the design and development of an ridged horn to match the waveguide impedance to freespace impedance so that the horn could be used as a feed for an offset-fed parabolic reflector over a wide band of frequencies, i.e., C and X bands (4.2 to 10.2 GHZ). In the present case, a five stepped chebyshev transformer has been used. Complete design required for horn feed as well for the ridged waveguide components necessary for testing has been carried out. The results obtained are quite encouraging. Good agreement is found between the measured results and theoretical values.

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Vincenti Gatti, Roberto, Riccardo Rossi, and Marco Dionigi. "Wideband Rectangular Waveguide to Substrate Integrated Waveguide (SIW) E-Plane T-Junction." Electronics 10, no. 3 (January 23, 2021): 264. http://dx.doi.org/10.3390/electronics10030264.

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A broadband rectangular waveguide to substrate integrated waveguide power divider for hybrid beam forming networks is presented. Rectangular waveguide symmetric E-plane irises are used to realize a multi-section matching network. A hybrid circuit and full-wave design procedure are described and adopted to synthesize three matching networks with one, two, and three irises, progressively increasing the bandwidth and exceeding the state of the art in the last two cases. Three proof-of-concept prototypes are manufactured and tested to validate the design procedure. Good agreement between simulated and measured performance confirms the validity of the proposed solution.

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Yoo, Young-Geun, and Jae-Ha Choi. "Rectangular Waveguide-NRD Waveguide Transition having the NRD Waveguide Built-in Structure." Journal of Korean Institute of Electromagnetic Engineering and Science 19, no. 4 (April 30, 2008): 391–96. http://dx.doi.org/10.5515/kjkiees.2008.19.4.391.

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Weng, Qianru, Qian Lin, and Haifeng Wu. "An Efficient Semianalytical Modal Analysis of Rectangular Waveguides Containing Metamaterials with Graded Inhomogeneity." International Journal of Antennas and Propagation 2021 (February 2, 2021): 1–13. http://dx.doi.org/10.1155/2021/6107378.

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Rectangular waveguides containing inhomogeneous metamaterials with graded refractive-index profiles have potential applications in bending waveguides and radiation-enhanced antennas, and accurate eigenvalue solutions are prerequisite. Commonly used commercial electromagnetic solvers such as HFSS, COMSOL, and CST could not efficiently calculate the eigenvalues of waveguides containing graded refractive-index dielectrics. In this paper, an accurate and efficient semianalytical method based on the modal expansion has been proposed to solve these waveguides. The proposed method has been employed to calculate the eigenvalues, including the cutoff wavenumbers and dispersion relations, for metamaterials with various graded refractive-index profiles. Calculated results are then validated by comparison, using commercial solver HFSS, which indicates the superiority of the proposed method in accuracy and efficiency. Below-cutoff backward wave propagation is observed in waveguides filled with graded refractive-index metamaterials, which provides a new approach for waveguide miniaturization.

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Huo, Xingying, and Zheng Li. "Right/Left-Handed Leaky Rectangular Waveguide with Broadside Radiation Property." International Journal of Antennas and Propagation 2021 (January 21, 2021): 1–5. http://dx.doi.org/10.1155/2021/8309431.

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When a leaky rectangular waveguide is used to realize the coverage of radio wave in the small confined spaces, there will be a shadow region, which influences the coverage performance. In this paper, the traditional leaky rectangular waveguide is improved according to the principle of the equivalent circuit, by cutting interdigital slots in the upper wall and adding uniserial metal vias between the upper and lower walls of the rectangular waveguide. Thus, the right/left-handed transmission line property is introduced to the periodic leaky-waveguide (LWG), realizing the broadside radiation with relatively high gain (15.7 dBi), good cross polarization (−50 dB), and narrow half-power beamwidth (10.9°) at 6.97 GHz and providing a method for a uniform coverage of the radio wave in rooms without a shadow region.

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Selina, N. V. "Bragg waveguide of rectangular cross-section." Computer Optics 44, no. 4 (August 2020): 552–60. http://dx.doi.org/10.18287/2412-6179-co-672.

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A method for calculating parameters of rectangular waveguides using separation of variables is presented. The method makes it possible to calculate multilayer Bragg waveguides with an arbitrary number of layers and an arbitrary composition as photonic crystal structures with defect. A result of the numerical calculation of the dispersion diagram of such a structure is given. This result is in good agreement with the earlier published data on the study of similar structures.

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Тришин, Павло Романович, Наталя Вікторівна Гончар, and Кирило Олександрович Терещенко. "АВТОМАТИЗАЦІЯ ФІНІШНОГО ОБРОБЛЕННЯ ПРЯМОКУТНИХ КУТОВИХ ХВИЛЕВОДІВ S-ДІАПАЗОНУ." Aerospace technic and technology, no. 6 (November 27, 2020): 45–53. http://dx.doi.org/10.32620/aktt.2020.6.05.

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Finishing of waveguides (sharp edges blunting, burrs removal, polishing of welding or soldering of the duct and flanges) is carried out in order to eliminate all surface damages that are formed from previous operations and give it the necessary roughness, which affects the amount of active power loss. In most cases of complex spatial shape rectangular waveguides with angled welded transitions, the finishing of the duct is performed manually or by means of small mechanization. An alternative to the finishing of waveguide duct is anode-abrasive vibration honing, abrasive-extrusion processing, processing on special grinding machines, hydro-abrasive pumping. These methods are low productivity, require complex equipment, washing treated surfaces, and are applied only to straight waveguides or those that have a smooth flexion. Preliminary researches of polishing the waveguide duct with a polymer-abrasive brush have shown good results in terms of roughness, performance and electrical parameters.To automate finishing of the waveguides that have simple form or one simple rectangular flexion, it was proposed to perform it on a horizontal CNC milling machine. For processing of waveguides two types of polymer-abrasive brushes of Osborne firm were consistently applied: internal and end brushes. Processing involved polishing duct in welding seam spots and a flange, burrs removal immediately after processing on the same machine on which milling of flanges of waveguides was carried out.Also for mechanization of finishing the complex designed waveguides (more than one flexion) it is offered to replace operation of consecutive manual polishing by small mechanization of polishing on special equipment. The trajectory of the tool was provided by a copier.This device also provides the preset tightness automatically and ability to adjust it as the tool wears out. As a result of the improvement in finishing, the manual polishing of the waveguide was completely removed, and the geometry and roughness of the duct were significantly improved. The development of special equipment has significantly (3…5 times) reduced time and human impact on machining accuracy.

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Park, Eunyoung, and Sangkil Kim. "Design and Analysis of a TEM Mode Rectangular Coaxial Waveguide for Mobile 5G Millimeter Wave Antenna Module Applications." Journal of Electromagnetic Engineering and Science 20, no. 3 (July 31, 2020): 169–75. http://dx.doi.org/10.26866/jees.2020.20.3.169.

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In this paper, design and analysis of a transverse electromagnetic (TEM) mode rectangular coaxial waveguide for a mobile 5G millimeter wave (mmWave) antenna module are presented. General structures of 5G radio frequency (RF) module for mobile sub-6 GHz and mmWave applications are also discussed in this paper. Thorough analysis of transmission line and waveguide structures at mmWave frequency band is essential and fundamental information to design highly integrated RF front-end modules. Theoretical design equations of the waveguide, such as impedance, loss, and radiation are presented, and the equations are verified by a full wave 3D FEM electromagnetic simulator. Impedance value of the rectangular waveguide structure was calculated using the conformal mapping method. Theoretical operation frequency bandwidth and design guide are also presented. The characteristics and analysis of the rectangular coaxial waveguide structure presented in this paper is easily scalable to other frequency bands. The proposed design equations are also applicable to various planar layer-by-layer integrated circuit (IC) or module manufacturing process.

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