Author
M. Omori
Bio: M. Omori is an academic researcher. The author has contributed to research in topics: Circulator & Dielectric resonator. The author has an hindex of 1, co-authored 1 publications receiving 17 citations.
Topics: Circulator, Dielectric resonator
Papers
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20 May 1968
TL;DR: In this paper, the design and performance of an improved E-plane waveguide circulator is described. But, the Eplane circulator has received much less attention than its H-plane counterpart, probably due to the difficulty of achieving broadband performance and the lack of adequate design information.
Abstract: This report describes the design and performance of an improved E-plane waveguide circulator. Although the E-plane circulator has the advantages of higher power operation and more compactness, it has received much less attention than its H-plane counterpart. This has probably been due to the difficulty of achieving broadband performance and the lack of adequate design information. It is proposed in this report that best performance occurs when the dimensions of the ferrite cylinder are adequate to support the fundamental cylindrical dielectric resonator mode. The junction dimensions are reduced to enhance the coupling of the incident energy to this dielectric resonator. At the junction, a novel approach is employed to convert the absorption type cavity to a transmission type. Reduced height transformers match the junction to the standard waveguide ports.
17 citations
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TL;DR: In this article, the eigennetworks of radial-waveguide circulators using partial-height ferrite resonators with n=2 Chebyshev characteristics were derived. But the phase angles were not derived.
Abstract: This paper derives the eigennetworks of radial-waveguide circulators using partial-height ferrite resonators with n=2 Chebyshev characteristics. To obtain a Chebyshev response with such junctions it is necessary to establish the proper phase angles and admittance levels of the three eigennetworks of the device. This paper derives the phase angles for the eigennetworks but relies on experiments to establish the admittance levels. The configurations dealt with include the standard circulators using either half-wave-long ferrite resonators open circuited (OC) at both ends or coupled quarter-wave-long ferrite resonators OC at one end and short circuited (SQ) at the other. It also includes the design of a new single quarter-wave-long version, which is likely to replace the two more conventional arrangements in common usage. It is observed that the eigennetworks of any one of the geometries is sufficient to characterize the other two.
51 citations
TL;DR: In this paper, the authors give simple methods by which each of these parameters may be measured in the case of the below-resonance stripline circulator. But these measurements are made in the input transmission line of the device with other two ports connected to similar transmission lines terminated in their characteristic impedance.
Abstract: To have a full understanding of the experimental behavior of a junction circulator it is necessary to be able to measure the gyrator conductance, the susceptance slope parameter, and the frequencies of the two split resonant modes of the junction. It is also useful to be able to construct mode charts to determine the geometry of the device. The purpose of this short paper is to give simple methods by which each of these parameters may be measured in the case of the below-resonance stripline circulator. The techniques developed here all stem from the scattering and immittance matrices of the device. They are therefore quite general. They also require no phase information which makes them ideally suitable for reflectometer-type measurement. All measurements described here are made in the input transmission line of the device with the other two ports connected to similar transmission lines terminated in their characteristic impedance. The results obtained here apply to Iossless circulators for which the two resonant modes are symmetrically split by the magnetic field, and for which the frequency variation of the third mode can be omitted.
19 citations
01 Jan 1975
TL;DR: In this article, the authors give tuning curves for the counterrotating modes of partial-height ferrite geometries in standard rectangular waveguides, and include experimental results on single and coupled discs which are in good agreement with the theory.
Abstract: The paper gives tuning curves for the counterrotating modes of partial-height ferrite geometries in standard rectangular waveguides. The results apply to the three commonly used partial-height geometries since they are all related by the method of images. The influence of the image plane or waveguide wall on the frequency of the open dielectric mode is accounted for by using standard transverse-resonance techniques. The paper includes experimental results on single and coupled discs which are in good agreement with the theory.
17 citations
TL;DR: In this article, the resonator structure employed in an E-plane circulator may be described by a series-resonant circuit as opposed to a parallel circuit in the case of comparable H-plane devices, resulting in a change of the direction of circulation at the edges of the circulator passband.
Abstract: The resonator structure employed in an E-plane circulator may be described by a series-resonant circuit as opposed to a parallel circuit in the case of comparable H-plane devices. This is shown to result in a change of the direction of circulation at the edges of the circulator passband. Employing the equivalent circuit representation methods to increase the bandwidth of the E-plane circulator are discussed.
16 citations
18 May 2009
TL;DR: In this article, the design, simulation and enhancing performance of a new structure for X-band high power, low loss, low bias, triangular-ferrite waveguide circulator is presented.
Abstract: The design, simulation and enhancing performance of a new structure for X-band high-power, low-loss, low-bias, triangular-ferrite waveguide circulator is presented. Dual circulation property is obtained by triangular shape of ferrite post. The effects of circulator's structure parameters, such as ferrite parameters and magnetic DC bias, on isolation, insertion loss and return loss of circulator are discussed. 20dB return loss, 20dB isolation and 0.1 dB insertion loss in dual frequency in X-band (8.2 Ghz & 10.4 Ghz) with only a magnetic bias of 10 Oe are obtained from CST Microwave Studio and Ansoft HFSS simulations which have good agreement to each other and shows remarkable response of those type of circulators.
12 citations