Comments on the Design and Manufacture of Dual-Mode Reciprocal Latching Ferrite Phase Shifters

Boyd, C.R.

doi:10.1109/tmtt.1974.1128300

Cited by 16 publications

(7 citation statements)

References 5 publications

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“…Figure 10 shows a family of curves relating deviation of available band-edge phase shift from nominal as a function of fractional bandwidth for selected band-center ω m /ω values. As with the longitudinal field case [6], modulation of insertion loss will occur with deviation of the polarizers or Faraday rotators, although the smaller frequency dependence of the latter will yield less band-edge modulation over the same frequency range. Hence, for the configuration using Faraday rotators, it appears that a smaller insertion loss modulation is exchanged for a greater dispersion of phase shift characteristics.…”

Section: Rf Design Considerationsmentioning

confidence: 99%

“…The transverse magnetic bias field reduces the switching shorted-turn damping time constant. (6) where µ i is the initial permeability, given by…”

Section: )mentioning

confidence: 99%

“…However, the switching performance of the device is affected by eddy currents induced in the waveguide walls whenever the magnetic flux of the bias field is changed to produce phase shift. Prior study [6] of the longitudinal field dual-mode phase shifter has shown energy increases dramatically when the switching time is reduced below a particular reference time, defined as the "shorted-turn" damping time constant, which is determined by the structure dimensions and by the resistivity and thickness of the waveguide walls. The transverse field dual-mode device exhibits similar behavior, but the reference time is signifi- The switching cycle consists of a "reset" portion followed by a "phase set" portion, as indicated in Fig.…”

Section: Switching Considerationsmentioning

confidence: 99%

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A New Type of Fast-Switching Dual-Mode Ferrite Phase Shifter

Hord

Boyd

Diaz

1987

IEEE Trans. Microwave Theory Techn.

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A new type of dual-mode phase shifter which uses a tranversely magnetized variable field section is described. The device retains the features of the conventional dual-mode phase shifter--low insertion loss, moderate amplitude modulation, adequate frequency bandwidth, simple physical geometry--which allow it to be considered for use in two-dimensional scanning arrays. However, because of the transverse magnetizing field, the shorted-turn resistance is increased which results in either reduced switching time or reduced switching energy when compared with the conventional dual-mode unit which utilizes a longitudinal magnetizing field.

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Section: Rf Design Considerationsmentioning

confidence: 99%

“…The transverse magnetic bias field reduces the switching shorted-turn damping time constant. (6) where µ i is the initial permeability, given by…”

Section: )mentioning

confidence: 99%

Section: Switching Considerationsmentioning

confidence: 99%

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A New Type of Fast-Switching Dual-Mode Ferrite Phase Shifter

Hord

Boyd

Diaz

1987

IEEE Trans. Microwave Theory Techn.

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“…Waveguide Faraday ferrite phase shifters (WFFPS) with longitudinal magnetization are widely used in the microwave and EHF bands technique, both as standalone devices in waveguides [1,2], and as a part of devices, for example, elements of integrated phased antenna arrays (PAA) [3,4,5,6]. As a rule, these WFFPS are performed on the basis of ferrite rods (FR) with a round or square cross-sectional shape [4,5,6].…”

Section: Introductionmentioning

confidence: 99%

Analysis of a fast-acting waveguide ferrite phase shifter with longitudinal magnetization phasing structure

2019

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The electrodynamic analysis and calculation of the phasing structure of a waveguide ferrite Faraday phase shifter with longitudinal magnetization of a ferrite rod with a square cross-section are performed. In the strict electrodynamic formulation, the Galerkin method solves the key problem for the design of the phase shifter: the problem of eigenwaves finding with a second-order differential magnetic operator in the projection procedure for a rectangular waveguide with a transversely inhomogeneous ferrite-dielectric filling under longitudinal magnetization. The problem is reduced to solving the complete eigenvalue problem of a complex matrix. The computational algorithm, implemented as a computer program in DELPHI, gives in one procedure the numerical values of the coefficients of the decomposition of fields in the form of eigenvectors of the matrix, and the coefficients of wave propagation in the form of its eigenvalues. The results of calculations of the phasing structure activity for two particular cases of its implementation are presented: on the basis of a ferrite rod both with a conductive coating and without a coating, it is shown that in the second case the activity of the phase shifter is 1.5 times higher. For the real parameters of the ferrite medium, the length of the phasing structure is calculated depending on the transverse dimensions of the ferrite rod and the square waveguide, which ensures the creation of a 360° controlled phase shift.

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“…The most efficient ferrite control devices are those which take maximum advantage of this phenomenon, and are consequently nonreciprocal. Dual-Mode [1], [2] and Rotary-Field [3], [4] phase shifters are no exception to this rule; they are in fact simply nonreciprocal devices whose configuration has been arranged to create reciprocal phase shift between the device terminals. The intrinsic nonreciprocal nature of these phase shifters allows a further adaptation to be made that provides duplexing.…”

Section: Introductionmentioning

confidence: 99%

Duplexing Ferrite Reciprocal Phase Shifters

Boyd

2005

IEEE MTT-S International Microwave Symposium Digest, 2005.

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The basic structure of microwave ferrite reciprocal phase shifters of the Dual-Mode and Rotary-Field types can readily be adapted to incorporate the function of a circulator outside the phase shifting region. The circulator effect is realized in the form of orthogonal polarization of waves in the two directions of propagation in circular or square waveguide at the input of the device. A mode-separating waveguide junction is required to resolve these orthogonal modes into two single-mode waveguides.This paper presents specific implementations of duplexing ferrite reciprocal phase shifters, comments on the factors affecting the isolation of the equivalent-circuit circulator, and discusses possible advantages in antenna system applications.

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Comments on the Design and Manufacture of Dual-Mode Reciprocal Latching Ferrite Phase Shifters

Cited by 16 publications

References 5 publications

A New Type of Fast-Switching Dual-Mode Ferrite Phase Shifter

A New Type of Fast-Switching Dual-Mode Ferrite Phase Shifter

Analysis of a fast-acting waveguide ferrite phase shifter with longitudinal magnetization phasing structure

Duplexing Ferrite Reciprocal Phase Shifters

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