| 摘要 |
This invention provides novel combline resonators with multiple conductors and multiple dielectrics for compact filters and multiplexers with improved electric response. The novel combline resonator consists of multi-conductors being made up for the simplest case of an inner metallic post, an intermediate conductor, and an enclosure. This structure provides two resonant modes that can be used for realizing compact microwave filters and multiplexers. Such filters offer the low cost, compact size and ease of manufacturing features of traditional combline resonator filters, with additional size reduction due to the fact that a single physical cavity provides two electrical resonators. In addition, the new cavity inherently introduces a transmission zero in the guard-bands enhancing the filter selectivity. |
| 主权项 |
1. A radio-frequency/microwave multi-conductor combline resonator cavity comprising:
a. a conducting enclosure having a base, a top, a set of walls, said walls having an enclosure height, and an inlet port and an outlet port installed on said enclosure walls; b. a conducting post having a proximal end, a distal end and a variable post height, said post height being the distance between the distal and the proximal ends, and wherein the proximal end of said post being attached to the base of the enclosure, and the distal end of the post being free; and c. a conducting intermediate shell surrounding said post and placed in between the post and the enclosure walls forming an inner cavity between the post and the shell and an outer cavity between the shell and the enclosure walls, said shell having a top, a bottom, a shell thickness, shell walls, and a shell height, wherein said shell height being smaller than said enclosure height, and the bottom of the shell being connected to said base. d. said inner and outer cavities sized to provide two resonant modes being non-synchronous to realize dual-band filters or synchronous to realize dual-mode filters having different operations.
whereby the relative field intensities inside the resonator being dependent on the relative heights of the inner post and the intermediate conductor, as well as the size and shape of the inner and outer cavities. |
