A Dual-Mode Latching, Reciprocal Ferrite Phase Shifter

Boyd, C.R.

doi:10.1109/gmtt.1970.1122842

Cited by 42 publications

(16 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2, marking the first time a reciprocal ferrite-based phase shifter is realized in SIW technology. The reciprocal property is required for a phase shifter employed in simultaneous transmit/receive antenna arrays [20], [21]. In addition, the device achieves better performance relative to the previously reported one, increasing the FoM by nearly six times, the normalized phase shift by about five times, and reducing required current by 25%.…”

mentioning

confidence: 99%

An Integrable SIW Phase Shifter in a Partially Magnetized Ferrite LTCC Package

Nafe

Shamim

2015

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

There is a growing need for small size integrable phased antenna arrays for emerging satellite communications on-the-move applications. Traditional ferrite-based phase shifters are generally bulky due to the need of electromagnets for biasing, yielding them unsuitable for this kind of application. In this paper, a novel compact light-weight substrate integrated waveguide (SIW) based phase shifter realized in a multi-layer ferrite low-temperature co-fired ceramic package with embedded bias windings is reported. By using embedded windings and operating the material in a partially magnetized state, the required bias magnetic field could be significantly reduced from typically about 1000 Oe to less than 50 Oe. Moreover, the presented phase shifter has two modes of operations corresponding to two different biasing scenarios of the SIW, namely, symmetric and anti-symmetric bias. Under anti-symmetric bias, the phase shifter can achieve high nonreciprocal phase shift, whereas under symmetric bias, the phase shift is reciprocal, but the available phase shift is less than the anti-symmetric case. The fabricated prototype operates in the 11.5-13.5-GHz range and has a peak figure of merit (phase shift per decibel of loss) of 102 dB and a maximum phase shift per unit length of 153 cm, which are more than five times the previously reported figures for this technology. Due to the use of embedded windings, the presented phase shifter offers a huge size reduction from the order of cm to mm , making it particularly useful for mobile phased-array applications.Index Terms-Ferrite phase shifter, low-temperature co-fired ceramic (LTCC), substrate integrated waveguide (SIW).

show abstract

mentioning

confidence: 99%

An Integrable SIW Phase Shifter in a Partially Magnetized Ferrite LTCC Package

Nafe

Shamim

2015

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

show abstract

“…Disappearance is accounted 'for by enzymatic degradation, and not by tis-64 a varying intensity range makes it independent of any secular variation in total intensity, and the fact that it does not use the polarity of the magnetic field means that it is not affected by the reversals of the polarity of the earth's magnetic field that have taken place several times since the phylogenetic origin of birds (7). In the case of adenosine 5'-monophos-phate (5'-AMP), we have shown that the relevant metabolic enzymes are located within endothelial caveolae intracellulares open to the vascular lumen (3).…”

mentioning

confidence: 99%

Angiotensin I: Metabolism by Plasma Membrane of Lung

Ryan¹,

Smith²,

Niemeyer³

1972

Science

View full text Add to dashboard Cite

(8-L-[(14)C] phenylalanine) angiotensin I is metabolized in one passage through blood-free lungs. Approximately 20 percent of the radioactivity emerges as angiotensin 11, the remainder as lower homologs. Radioactivity is not retained by the lungs but has the same volume of distribution and mean transit time as blue dextran, a compound unlikely to leave the intravascular space. Plasma membrane fractions of lung are capable of converting angiotensin I to angiotensin II. These data, taken together, indicate the circulating angiotensin I is metabolized by enzymes of the luminal surface of pulmonary endothelial cells.

show abstract

“…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: 94%

Duplexing Ferrite Reciprocal Phase Shifters

Boyd

2005

IEEE MTT-S International Microwave Symposium Digest, 2005.

View full text Add to dashboard Cite

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.

show abstract

A Dual-Mode Latching, Reciprocal Ferrite Phase Shifter

Cited by 42 publications

References 3 publications

An Integrable SIW Phase Shifter in a Partially Magnetized Ferrite LTCC Package

An Integrable SIW Phase Shifter in a Partially Magnetized Ferrite LTCC Package

Angiotensin I: Metabolism by Plasma Membrane of Lung

Duplexing Ferrite Reciprocal Phase Shifters

Contact Info

Product

Resources

About