Nonreciprocal Remanence Phase Shifters in Rectangular Waveguide

Ince, W.J.; Stern, E.

doi:10.1109/tmtt.1967.1126381

Cited by 72 publications

(12 citation statements)

References 4 publications

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“…(5), (6), and (7) into Eqs. (8) and (9) yields the following cutoff-characteristic equation for modes in the circular waveguide filled with three dielectric layers:…”

Section: Theoretical Analysismentioning

confidence: 99%

“…In the usual design of latching ferrite phase-shifters, the dielectric fills the ferrite toroid in order to improve the performances [6]. Accordingly, in the design of the ferrite variable polarizer considered here, we also considered using dielectric filling for the purpose of improving the performances.…”

Section: Introductionmentioning

confidence: 99%

“…They tackle the nonexistence of the inverse scattering problem by redefining it as the minimization of a cost functional. The deterministic algorithms seek to solve the inverse-scattering problem by linearizing it around a current estimate and then seeking progressively better estimates of the solution, for example, the distorted Born iterative method [3], Newton Kantorovich method [4,5] or the modified gradient method [6]. However, due to the nonlinearity of the inverse-scattering problem, there is a risk that the solution will be trapped in a local minimum.…”

Section: Introductionmentioning

confidence: 99%

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On single‐mode transmission of variable ferrite polarizers in circular waveguide

Che

Yung

2004

Micro & Optical Tech Letters

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two-stage 2110 -2170-MHz power amplifier was built for the purpose of linearization. Its final stage used a LDMOS MRF21336 amplifier by Motorola. The overall gain of this lineup is 44 dB and the P1dB is approximately 35 dBm. Figure 5 shows the measured results of the first experiment for a four-carrier W-CDMA test signal (20-MHz signal bandwidth). Figure 5(a) shows the output spectral power with and without the predistorter at an output power of 24 dBm. Before linearization, the output power of the power amplifier was 24 dBm and the ACLR was Ϫ40.0 dBc. After linearization, the output power was the same but the ACLR was Ϫ45.8 dBc, an ACLR improvement of 5.8 dB. Figure 5(b) shows the ACLR improvement over a range of output powers from 18 to 33 dBm.For the second experiment, a three-stage 2100 -2170 MHz power amplifier was built for the purpose of this study. Its final stage used two LDMOS MRF21085 devices by Motorola. The second stage was built on the LDMOS MRF21045 amplifier. The first stage used a gain block to drive the two other stages. The overall gain of this lineup is 51 dB and the output power at 1-dB gain compression is approximately 51 dBm. Figure 6 shows the measured results of the second experiment by the four-carrier W-CDMA test signal (20-MHz signal bandwidth). Figure 6(a) shows the output spectral power with and without the predistorter at an output power of 38 dBm. An ACLR improvement of 4.7 dB was obtained. Figure 6(b) shows the ACLR improvement over a range of output power from 31 to 45 dBm. CONCLUSIONA new analog predistorter using a Cartesian vector modulator structure has been demonstrated. This predistorter can easily accommodate four different types of gain and phase characteristics through independent bias adjustments of the two IM generators. We have analyzed the operation principle of the proposed predistorter. To verify the proposed predistorter, a W-CDMA fourcarrier linearization test was performed at a frequency of 2120 MHz. The results showed that an ACLR improvement over a broad range of output power levels is possible. This predistorter can be easily linked to an appropriate adaptation control circuit that has a few control parameters.

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“…(5), (6), and (7) into Eqs. (8) and (9) yields the following cutoff-characteristic equation for modes in the circular waveguide filled with three dielectric layers:…”

Section: Theoretical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On single‐mode transmission of variable ferrite polarizers in circular waveguide

Che

Yung

2004

Micro & Optical Tech Letters

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“…It is well known that the properties of a ferrite substrate can be altered by the application of magnetic fields across it [4], [5]. This property of ferrites has been used previously for the design of latching and tunable phase shifters [6]- [9]. Ferrite based phase shifters, typically exhibit low insertion loss and high power handling capability.…”

Section: Introductionmentioning

confidence: 99%

A Partially Magnetized Ferrite LTCC-Based SIW Phase Shifter for Phased Array Applications

Ghaffar

Shamim

2015

IEEE Trans. Magn.

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The theory and design of a half mode SIW ferrite LTCC based phase shifter is presented in this work. Unlike typical ferrite based designs, the biasing is done through embedded windings in a multilayer substrate which not only obviates the requirement of bulky electromagnets but also prevents loss of bias fields at the air-to-ferrite interface. The phase shifter is operated in the partially magnetized state of ferrite substrate. Through the combined effect of embedded windings, half mode waveguide operation and partially magnetized state, the required bias fields have been reduced by 90% as compared to conventional ferrite based designs employing electromagnets. A complete analytical model, backed up by electromagnetic simulations and measured results from a prototype, is presented in this paper. The fabricated prototype demonstrates a phase shift of 83.2 at a center frequency of 13.1 GHz and a figure of merit of 83.2/dB. As a proof-of-concept, the proposed phase shifter design is monolithically integrated with a twoelement antenna array to demonstrate a measured beam steering of 30. The phase shifter design is highly efficient in terms of required bias fields, has a small form factor and can be easily integrated with other electronic components and systems.

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“…They take advantages of high Q value, high power handling capability etc. [8][9][10][11]. However, their drawbacks, such as heavy weight, large volume, difficulty to be integrated with planar circuits etc., hobble their applications in wireless communication.…”

Section: Introductionmentioning

confidence: 99%

Design Investigation on Millimeter-Wave Ferrite Phase Shifter in Substrate Integrated Waveguide

Che¹,

Yung²,

Wu³

et al. 2004

PIER

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Abstract-In this paper,the design idea and technique of the ferrite phase shifter in substrate integrated waveguide (SIW) has been reported. The characteristics of the millimeter-wave ferrite phase shifter have been firstly calculated analytically, and the relative parameters of the device have been decided on the basis of optimization. At the same time, the design procedure of transition from ferrite phase shifter in SIW to CPW has been introduced; the agreement between the simulation results of the final integrated structure and the experimental results of an equivalent model has shown the good performance of this integrated structure.

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Nonreciprocal Remanence Phase Shifters in Rectangular Waveguide

Cited by 72 publications

References 4 publications

On single‐mode transmission of variable ferrite polarizers in circular waveguide

On single‐mode transmission of variable ferrite polarizers in circular waveguide

A Partially Magnetized Ferrite LTCC-Based SIW Phase Shifter for Phased Array Applications

Design Investigation on Millimeter-Wave Ferrite Phase Shifter in Substrate Integrated Waveguide

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