Microstrip circulator made of a magnetized ferrite sphere

Yung, E.K.N.; Dou, Wenbin; Zhang, D. G.; Chen, R. S.

doi:10.1002/1098-2760(20010120)28:2<130::aid-mop16>3.0.co;2-q

“…The excellent performance of the PBG and low material loss demonstrate that triangular lattice PCs using Al 2 O 3 rods is a promising method for generating optical distributor or other optical devices with PBG in integrated optical communication in the future. If some nonreciprocal sample such as ferrite post or sphere biased external magnet is put in the central point of the waveguide's junction like the authors’ previous work, a circulator with 2D PCs structure may be realized in the frequency of the PBG of PCs.…”

Section: Resultsmentioning

confidence: 95%

Transmission characteristics of Y‐type optical distributor in triangular lattice photonic crystals with Al₂O₃ rods

Wang¹,

Zhang

²

,

Xu

³

et al. 2018

Micro & Optical Tech Letters

4

0

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In this work, a Y‐type optical distributor formed by triangular lattice photonic crystals is numerically and experimentally investigated. The crystals are formed by cylindrical Al2O3 rods array in the air. The band gaps of TE modes for the photonic crystals are calculated by plane wave expansion method. Three photonic band gaps appear numerically within the normalized frequency range 0∼0.8 true(2πc/atrue) in the triangular lattice photonic crystals. Based on a Y‐type defect structure, an equal optical distributor is realized within the first photonic band gap of 0.2380 true(2πc/atrue)∼0.2823 true(2πc/atrue). The transmission characteristic of the distributor is calculated by finite element method. To validate the numerical results, experiments were performed in the microwave regime. An Agilent E8361C vector network analyzer was used. The measured reflection and transmission characteristics of the photonic crystals sample agree with the numerical results between 9.77 and 9.91 GHz in the first photonic band gap. At the frequency of 9.86 GHz, the isolation of the photonic crystals reaches −39.02 dB and about 95.72% energy reflecting back to the input port. Furthermore, the equal optical distributor is also validated by making a comparison between the numerical and experimental results.

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Ferrite Circulators

Yung¹,

Wang²,

Chen³

2005

Encyclopedia of RF and Microwave Engineering

0

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The circulator is one of the elementary building blocks in radiofrequency and microwave circuits. It is used extensively in making basic devices for communications and radar systems. The latter are often used in broadband and high‐power rating systems at microwave and millimeter‐wave frequencies. It is, however, seldom found in consumer products because some of its functions can be performed by simpler and cheaper alternatives. However, interest in circulators has been revitalized with the emergence of mobile communications in recent years. As more and more users are accustomed to the freedom provided by cellular phones, communication without the constraint of an attached wire is considered as natural as breathing air. In addressing the ever‐increasing public demands, numerous wireless systems have been launched and more are coming. The most notable ones are wireless local‐area network, wireless local subscriber loops, and other high‐bit‐rate yet low‐error‐rate systems of data transmission. For these systems, the overlooked circulator enjoys a competitive edge as most active switches could not deliver the needed power rating and bandwidth at a reasonable price, especially those in the ultra high frequency band and beyond.

show abstract

Ferrite Circulators

Yung,

Wang,

Chen

2005

Encyclopedia of RF and Microwave Engineering

0

View full text Add to dashboard Cite

The circulator is one of the elementary building blocks in radiofrequency and microwave circuits. It is used extensively in making basic devices for communications and radar systems. The latter are often used in broadband and high‐power rating systems at microwave and millimeter‐wave frequencies. It is, however, seldom found in consumer products because some of its functions can be performed by simpler and cheaper alternatives. However, interest in circulators has been revitalized with the emergence of mobile communications in recent years. As more and more users are accustomed to the freedom provided by cellular phones, communication without the constraint of an attached wire is considered as natural as breathing air. In addressing the ever‐increasing public demands, numerous wireless systems have been launched and more are coming. The most notable ones are wireless local‐area network, wireless local subscriber loops, and other high‐bit‐rate yet low‐error‐rate systems of data transmission. For these systems, the overlooked circulator enjoys a competitive edge as most active switches could not deliver the needed power rating and bandwidth at a reasonable price, especially those in the ultra high frequency band and beyond.

show abstract

Microstrip circulator made of a magnetized ferrite sphere

Cited by 7 publications

References 4 publications

Transmission characteristics of Y‐type optical distributor in triangular lattice photonic crystals with Al₂O₃ rods

Transmission characteristics of Y‐type optical distributor in triangular lattice photonic crystals with Al₂O₃ rods

Ferrite Circulators

Ferrite Circulators

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Microstrip circulator made of a magnetized ferrite sphere

Cited by 7 publications

References 4 publications

Transmission characteristics of Y‐type optical distributor in triangular lattice photonic crystals with Al2O3 rods

Transmission characteristics of Y‐type optical distributor in triangular lattice photonic crystals with Al2O3 rods

Ferrite Circulators

Ferrite Circulators

Contact Info

Product

Resources

About

Transmission characteristics of Y‐type optical distributor in triangular lattice photonic crystals with Al₂O₃ rods

Transmission characteristics of Y‐type optical distributor in triangular lattice photonic crystals with Al₂O₃ rods