Microwave Dielectric Resonator Filters Utilizing Ba/sub 2/Ti/sub 9/O/sub 20/ Ceramics

Plourde, J.K.; Linn, D. F.

doi:10.1109/mwsym.1977.1124437

Cited by 8 publications

(1 citation statement)

References 4 publications

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“…The temperature stability [1]- [3] and the employment of HEH11 dual-mode are regarded as major breakthroughs for DR cavity filters [4], [5]. The single TE01 mode cavities did not attract much attention for satellite applications, due to the fact that they provided no significant advantage over an air-filled cylindrical dual-mode cavity [6] if transmission zeros could not be implemented in the stop band.…”

Section: Introductionmentioning

confidence: 99%

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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