HF filter using resonators having convex-concave structure

Details HF filter using resonators having convex-concave structure HF filter using resonators having convex-concave structure

1998-12-15

2000-11-21

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333202, 333222, H01P 120, H01P 704

Patent

active

06150906&

ABSTRACT:
An HF filter using resonators of a convex-concave structure is capable of easily inserting a serial or parallel capacitance inside the resonators for the sake of a characteristic improvement of frequency at a stop band desired. In the inventive HF filter, an error compensation is simple and a size smallization is available, by utilizing the resonators of the convex-concave structure. Such HF filter consists of a dielectric block having a multitude of grooves formed, in a length direction, on an upper face thereof; a plurality of resonators formed by covering a lowly constant portion of each groove with conductive material, for resonating signals inputted from the outside; a grounding electrode formed on an outer face of the dielectric block and electrically shorted with the PCB; an input electrode for receiving signals from the outside; an output electrode for outputting signals; and a first nonplating part for preventing the input and output electrodes from being electrically shorted with the grounding electrode and realizing a capacitive coupling among the input and output electrodes and its adjacent resonators, thereby being employed in a smallization of a radio communication system and an improvement of a communicative characteristic.

REFERENCES:
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patent: 5936489 (1999-08-01), Lee at al.
Matsumoto, Haruo et al., "A Miniaturized Dielectric Monoblock Band-Pass Filter For 800 MHz Band Cordless Telephone System"; 1994 IEEE MTT-S Digest, pp. 249-252.
Ishizaki, Toshio et al., "A Stepped Impedance Comb-Line Filter Fabricated By Using Ceramic Lamination Technique"; 1994 IEEE MTT-S Digest, pp. 617-620.
Ishizaki, Toshio et al., "A Very Small Dielectric Planar Filter For Portable Telephones"; IEEE Transactions On Microwave Theory and Techniques, vol. 42, No. 11, Nov. 11, 1994, pp. 2017-2022.

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