X-band microstrip circulator

Hershenov, B.

doi:10.1109/proc.1966.5355

Cited by 19 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1 Standard tables for the design of this type of circuit are given in [14] in the case where equals unity and in [15] for the more general case when is different from unity. Once the circulator specifications are specified, the loaded factor is evaluated and its value is used to check whether it is compatible with the very weakly or weakly magnetized models employed in this paper.…”

Section: Synthesis Of Quarter-wave Coupled-junction Circulatorsmentioning

confidence: 99%

“…Once the circulator specifications are specified, the loaded factor is evaluated and its value is used to check whether it is compatible with the very weakly or weakly magnetized models employed in this paper. If it is, the gyrator conductance and modified susceptance slope parameter 1 It is further assumed that the network variables apply provided (! + 0 !…”

Section: Synthesis Of Quarter-wave Coupled-junction Circulatorsmentioning

confidence: 99%

“…Some early experimental examples of this sort of hardware using disk resonators are to be found in [1]- [7]. In order to have a synthesis procedure, it is necessary to reconcile the physical details of the resonator, its gyrotropy, and the network one.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fabrication of very weakly and weakly magnetized microstrip circulators

Helszajn

1998

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

The synthesis of practical microstrip circulators in terms of a microwave specification remains in practice a difficult problem. If a very weakly magnetized model is adopted for its gyrator circuit, this task should in principle be (once the quality factor of the resonator is stipulated) a simple endeavor provided the substrate thickness can be varied. If it is not possible to do so, it is necessary to either alter the resonator shape or the minimum ripple level of the microwave specification or vary both quantities. This paper demonstrates that the very weakly magnetized model of a junction circulator using either a side or an end-coupled triangular resonator is more restricted than may be at first supposed. A weakly magnetized solution for the design of such junction circulators which bridges the interval between the very weakly and the moderately magnetized regimes is the main contribution of this paper.

show abstract

Section: Synthesis Of Quarter-wave Coupled-junction Circulatorsmentioning

confidence: 99%

Section: Synthesis Of Quarter-wave Coupled-junction Circulatorsmentioning

confidence: 99%

See 1 more Smart Citation

Fabrication of very weakly and weakly magnetized microstrip circulators

Helszajn

1998

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

show abstract

“…The first reported microstrip circulator operating at 8.3 GHz was realized by Hershenov, B. in 1966 [110]. Then another 3-port microstrip circulator was built in 1971 which operates near 30 GHz with an isolation greater than 20 dB and a fractional bandwidth about 6% [111].…”

Section: Microstrip Circulatormentioning

confidence: 99%

Non Reciprocal Passive Components on LTCC Ferrite Substrate

Yang

View full text Add to dashboard Cite

This thesis investigates passive non-reciprocal components (mainly circulators) based on ferrite Low Temperature Co-fired Ceramic (LTCC) substrate. The external magnets used in conventional circulators must be strong to overcome the ferrite's demagnetization field. The novel circulator presented herein uses an embedded winding within the ferrite substrate to magnetize the material from the inside, thereby significantly reducing the demagnetization effects. Because of the controllability of the bias field, the resulting device is also multifunctional: when the windings are energized by a current, the device operates as a dynamic circulator in which the circulation direction can be changed by switching the direction of the current. Unlike other LTCC circulators with external magnets, the proposed device can even operate as a power splitter by removing the bias current. A circulator prototype has been characterized in three states: unbiased, biased by winding and biased by winding and external magnets. When no current is applied, the transmission of each port is about-5 dB with a return loss better than 20 dB at 14.8 GHz. When a current of 300 mA is injected into the winding, the measured insertion loss and isolation of the circulator is approximately 3 dB and 8 dB, respectively, whereas the return loss is better than 20 dB at 14.2 GHz. When external magnets are added in addition to the current of 200 mA, the insertion loss and isolation is improved to 1.6 dB and 23 dB, respectively at 14.2 GHz. The variation of the circulator's working frequency is 0.6 GHz. This is v viii Table of Contents x List of Tables xv List of Figures xvi List of Figures 2.1 Circulator separates the transmission and reception signals. .. . .

show abstract

Bibliography

2007

The Stripline Circulator

View full text Add to dashboard Cite

X-band microstrip circulator

Cited by 19 publications

References 0 publications

Fabrication of very weakly and weakly magnetized microstrip circulators

Fabrication of very weakly and weakly magnetized microstrip circulators

Non Reciprocal Passive Components on LTCC Ferrite Substrate

Bibliography

Contact Info

Product

Resources

About