Precise Design of a Bandpass Filter Using High-Q Dielectric Ring Resonators

Kobayashi, Yoshihiro; Minegishi, M.

doi:10.1109/tmtt.1987.1133831

Cited by 61 publications

(15 citation statements)

References 7 publications

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“…4(a). It is also well known that to open a hole in the center of TE01 mode DR [8], [9] can increase the spurious free region of the cavity, as shown in Fig. 4(b).…”

Section: B Cavity Designmentioning

confidence: 94%

“…In this paper, they are computed by a rigorous radial mode-matching technique [8], [9]. The cavity , size, and spurious responses are dictated by the DR aspect ratio, which is defined as the ratio of DR diameter to DR thickness , as shown in Fig.…”

Section: B Cavity Designmentioning

confidence: 99%

“…The aspect ratio of the DR cavity should be properly chosen, otherwise the high-order modes may be too close to the working mode. Mode charts [8], [9] have been proposed to design DR cavities. The mode chart of a solid DR with dielectric constant of 44 is shown in Fig.…”

Section: B Cavity Designmentioning

confidence: 99%

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High-Q TE01 mode DR filters for PCS wireless base stations

Liang

Blair

1998

IEEE Trans. Microwave Theory Techn.

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This paper presents the state-of-the-art of high-Q TE01 mode DR cavity filters for PCS wireless base station applications. In order to have TE01 mode filter to be competitive with other high-Q cavity technologies, employment of nonadjacent coupling to implement advanced filter features and easy filter machining and integration are essential. The quadruplet and trisections are regarded as basic blocks to implement symmetric and asymmetric transmission zeros in filter stop band. The relative alignment of the magnetic mode field across the coupled adjacent cavities is analyzed to identify the sign of nonadjacent coupling. A direct cascading of a wide band combline filter to a TE01 mode dielectric resonator (DR) filter is proposed to suppress the spurious response of the DR cavity filter. This approach simplfies the integration between the DR filter and the spurious suppression device and has been proved to be very cost effective. Experimental eight-and six-pole quasi-elliptic function filters show the typical performances. To take advantage of the special property of magnetic mode field alignment across the adjacent cavities, a five-pole canonical asymmetric filter with three transmission zeros in low side is implemented. We believe this filter is a new design for high-Q cavity filter, while a threepole elliptic function filter is new for DR filter technology.

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“…4(a). It is also well known that to open a hole in the center of TE01 mode DR [8], [9] can increase the spurious free region of the cavity, as shown in Fig. 4(b).…”

Section: B Cavity Designmentioning

confidence: 94%

Section: B Cavity Designmentioning

confidence: 99%

See 1 more Smart Citation

High-Q TE01 mode DR filters for PCS wireless base stations

Liang

Blair

1998

IEEE Trans. Microwave Theory Techn.

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“…To apply the mode matching method in the radial direction [24,25], the transverse fields with respect to ρ direction in each cylindrical region are expanded in terms of cylindrical eigenmodes. Explicit expressions for the expansions are given in Appendix A.…”

Section: Pew-pmwmentioning

confidence: 99%

Modeling of Rectangular Waveguide Junctions Containing Cylindrical Posts

Sabbagh¹,

Zaki²

2001

PIER

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Abstract-Accurate determination of the generalized scattering matrix of the crossed waveguides junction, T -junction and right-angle bend containing a cylindrical post is presented. The generalized scattering matrix of the four port structure is obtained from those of the two ports right angle bend with different combinations of perfect electric and/or magnetic walls. The generalized scattering matrix of the right angle bend (quarter of the structure) is obtained by the mode matching method where the electromagnetic fields in rectangular waveguides are matched to those in a junction section formed by a sectoral region.

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“…The use of dielectric loaded resonators greatly improves the in-band performance, size, and thermal stability of the filters [3]- [9]. Although dielectric loaded resonators have higher unloaded Q, they have spurious responses [6], [7], [11], [12] which are too close. To satisfy the out-of-band requirements using the dielectric loaded resonator filter, a low-pass filter with very high rejection response is needed to be connected with the dielectric loaded filter.…”

Section: Introductionmentioning

confidence: 99%

Conductor loaded resonator filters with wide spurious-free stopbands

Wang

Zaki

Atia

et al. 1997

IEEE Trans. Microwave Theory Techn.

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A new configuration of conductor loaded resonator filters using two different size conductor loaded resonators and enclosures with significantly improved spurious performance is presented. A rigorous mode-matching method is used to compute the resonant frequencies, unloaded Q, and the fields of the resonant modes of the conductor (solid or ring) loaded resonators. The coupling coefficients between two resonators are computed using small aperture coupling theory. The stopband characteristics of the filter are investigated. An eight-pole ellipticfunction filter was designed, constructed, and tested. Extremely wide spurious-free stopband filter response was obtained which verified the theory.

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Precise Design of a Bandpass Filter Using High-Q Dielectric Ring Resonators

Cited by 61 publications

References 7 publications

High-Q TE01 mode DR filters for PCS wireless base stations

High-Q TE01 mode DR filters for PCS wireless base stations

Modeling of Rectangular Waveguide Junctions Containing Cylindrical Posts

Conductor loaded resonator filters with wide spurious-free stopbands

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