Waveguide junctions with several arms

Montgomery, C. G.; Dicke, R. H.

doi:10.1049/pbew025e_ch9

Cited by 27 publications

(35 citation statements)

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“…The Sparameters for the turnstile OMT in Ref. [24][25][26][27][28] are also found to be different from the structure presented here. where n is an nonnegative integer, when the waves reflected from the shorted Ports of 3 and 4 arrives at the central area, they will have a phase difference of 180 • , which means two opposite incident phases.…”

Section: Analysis and Optimization Of A Turnstile Polarizercontrasting

confidence: 70%

“…However, we will demonstrate that the S-parameter for the OMTs described in Ref. [24][25][26][27][28] is significantly different from that for the design presented here. The design goal of the Scattering-Matrix for the six modes is the following: there is no mode excited in the circular waveguide when the higher order mode (i.e., TM 01 ) is cutoff in the circular waveguide.…”

Section: Analysis and Optimization Of A Turnstile Polarizercontrasting

confidence: 54%

“…number and M is the mode number associated with Port N ). There are four symmetric planes: diagonal planes A and B, and horizontal and vertical planes C and D. This structure is conventionally used as a turnstile OMT [24][25][26][27][28]. However, we will demonstrate that the S-parameter for the OMTs described in Ref.…”

Section: Analysis and Optimization Of A Turnstile Polarizermentioning

confidence: 87%

“…Owing to the orthogonal basis of eigenvectors, the dot product of every two eigenvector should be zero, thus, b1 × b2 = −2, and c1 × c2 = −2. It is possible to choose the position of the reference planes in such a way [24] that b1 = c1 = √ 2, and then, b2 = c2 = − √ 2. The normalized orthogonal Matrix of eigenvectors X is …”

Section: The Four-port Dual Circular Polarizermentioning

confidence: 99%

See 3 more Smart Citations

Novel Compact Waveguide Dual Circular Polarizer

Chang¹,

Tantawi²,

Church³

et al. 2013

PIER

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Abstract-A novel type of dual circular polarizer for simultaneously receiving and transmitting right-hand and left-hand circularly polarized waves is developed and tested. It consists of a H-plane T junction of rectangular waveguide, one circular waveguide as an Eplane arm located on top of the junction, and two metallic pins used for matching. The theoretical analysis and design of the three-physicalport and four-mode polarizer were researched by solving ScatteringMatrix of the network and using a full-wave electromagnetic simulation tool. The optimized polarizer has the advantages of a very compact size with a volume smaller than 0.6λ 3 , low complexity and manufacturing cost. A couple of the polarizer has been manufactured and tested, and the experimental results are basically consistent with the theories.

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Section: Analysis and Optimization Of A Turnstile Polarizercontrasting

confidence: 70%

Section: Analysis and Optimization Of A Turnstile Polarizercontrasting

confidence: 54%

Section: Analysis and Optimization Of A Turnstile Polarizermentioning

confidence: 87%

Section: The Four-port Dual Circular Polarizermentioning

confidence: 99%

See 2 more Smart Citations

Novel Compact Waveguide Dual Circular Polarizer

Chang¹,

Tantawi²,

Church³

et al. 2013

PIER

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show abstract

“…From this point the waves are traveling in both directions inside the cavity and the transmitted power is absorbed in adjustable loads at both ends of the cavity to prevent any standing waves occurring in the cavity or radiation into free space. Carbon powder mixed with Portland cement, as recommended by Montgomery [33] was used as the absorbing material for the loads which were in the shape of cylinders and were mounted on the cavity. Their shape did not change with the temperature.…”

Section: Dual-mode Microwave Apparatus In X-band -Variation B)mentioning

confidence: 99%

The Dual Mode Microwave Afterglow Apparatus for Measuring the Electron Temperature Dependence of the Electron‐Ion Recombination

Mikuš

Morva

Morvová

et al. 2008

Contrib. Plasma Phys.

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Key words Stationary afterglow plasma, microwave diagnostics of plasma, electron heating with microwaves, dissociative recombination, electron temperature dependence of recombination, molecular neon ions. PACS 34. 80, 52.20, 52.70 Three dual mode microwave apparatus (one using S-band and two using X-band) have been developed to determine ambipolar diffusion and electron-ion recombination rates under conditions such that Tgas = 300K and Te is varied from 300 K to 6300 K, in the afterglow period of the dc glow discharge. The T M010 cylindrical cavity (in S-band) and T M011 open cylindrical cavity (X-band) are used to determine the electron density during the afterglow period and a non-resonant waveguide mode is used to apply a constant microwave heating field to the electrons. To test the properties of the apparatus the neon afterglow plasma has been investigated. At Te = 300 K a value of α(Ne (X-band) obeyed over the range 300 ≤ Te ≤ 6300K are in good agreement with some other previous measurements. The simplicity of the X-band microwave apparatus also allows the measurements of the gas temperature dependency and the study of electron attachment and may be used simultaneously with optical or mass spectrometry investigations.

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Compact filtering magic‐T using a hybrid microstrip‐cavity structure

Fang

et al. 2023

Micro & Optical Tech Letters

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This letter introduces a filtering magic-T based on a hybrid microstrip-cavity structure. TE 011 and TE 101 modes of the cavity are generated by the two perpendicular input microstrip lines to form the filtering responses. Because of the orthogonality of the feeding lines and the two resonant modes, in-and outof-phase output currents and high port isolations are achieved. The measured filtering responses of the two input ports are in good agreement with each other and possess high-frequency selectivity. The isolations of the input and output ports are below 41 and 22 dB, respectively. Moreover, benefiting from the hybrid microstrip-cavity structure, only two cavity resonators are employed, which realizes compact size.

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Waveguide junctions with several arms

Cited by 27 publications

References 0 publications

Novel Compact Waveguide Dual Circular Polarizer

Novel Compact Waveguide Dual Circular Polarizer

The Dual Mode Microwave Afterglow Apparatus for Measuring the Electron Temperature Dependence of the Electron‐Ion Recombination

Compact filtering magic‐T using a hybrid microstrip‐cavity structure

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