диафрагмированные волноводные фильтры / 767b73b0-3cbe-4429-8ede-2f2c4b3fd479

IEEE MICROWAVE AND GUIDED WAVE LETTERS, VOL. 10, NO. 7, JULY 2000

295

5,952,901 Sept. 14, 1999 5,952,902 Sept. 14, 1999

Laminated Electronic Component with Trimmable Parallel Electrodes

Inventor:	Kazuhiro Nakano
Assignee:	Alps Electric Co., Ltd.
Filed:	Nov. 19, 1997.

Abstract— A laminated electronic component has a structure in which an micro-strip line (MSL) is formed in a first dielectric layer, and a first ground layer and an adjustment pattern layer are formed on the top surface and the base surface of the first dielectric layer, respectively. A second dielectric layer is formed between the adjustment pattern layer and a second ground layer, comb teeth-shaped parallel electrodes having an area larger than that of the MSL is formed at a position opposed to the MSL in the adjustment pattern layer. A slit is formed not to be opposed to the MSL in the second ground layer and to be opposed to the connection points of the parallel electrodes. By emitting a laser beam from the direction of the second ground layer through the slit and the second dielectric layer, and separating the connection points of the parallel electrodes, the capacitance between the MSL and the ground can be adjusted in steps, which increases the resonant frequency of the MSL.

1 Claim, 3 Drawing Sheets

Coaxial “M” Switch

Inventors:	Rolf Kich, Richard L. Bennett, David M. Kershner, and James
	D. Thompson.
Filed:	Mar. 12, 1999.

Abstract— A coaxial “M” switch having three coaxial input connectors (A, B, C) spaced evenly from each other, and three coaxial output connectors (1; 2; 3) identically arranged. In a cylindrical barrel embodiment (10) the input and output connectors are located at opposite ends of a cylindrical configuration. In one planar embodiment (30), the input and output connectors alternate with each other and define a hexagonal configuration (40). In another planar embodiment, the input connectors (A, B, C) define an inner triangular configuration (70) that is surrounded by the output connectors (1; 2; 3) defining an outer triangular configuration. In each embodiment, reeds are actuated in predetermined configurations to define three switch positions.

13 Claims, 4 Drawing Sheets

5,953,472

Sept. 14, 1999

Method of and a Device for Making Bragg Gratings in Optical Fibers or Waveguides

Inventors:	Laura Boschis, Oriana Rossotto, and Luigi Tallone.
Assignee:	CSELT-Centro Studi e Laboratori Telecomunicazioni
	S.p.A.
Filed:	Apr. 27, 1998.

Abstract— A method and a device are described for the simultaneous fabrication of identical Bragg gratings in different optical fibers or optical waveguides. The fibers/waveguides (1) are mounted side-by-side on a common support (2), along with a phase mask (3), which gives the desired intensity distribution to a writing radiation of the grating. Said common support (2) is reciprocated transversally to the longitudinal axis of the fibers or waveguides, at an appropriately low frequency such that each fiber/waveguide is exposed to such a radiation, at each pass under the radiation, for a time sufficient to start a refractive index change.

296 IEEE MICROWAVE AND GUIDED WAVE LETTERS, VOL. 10, NO. 7, JULY 2000

12 Claims, 1 Drawing Sheet 5,955,931 Sept. 21, 1999

Chip Type Filter with Electromagnetically Coupled

Resonators

Inventors:	Toshimi Kaneko, Kazuo Dougauchi, Katsuji Matsuta, and
	Masahiko Kawaguchi.
Assignee:	Murata Manufacturing Co., Ltd.
Filed:	Jan. 11, 1996.

Abstract— There is provided a chip type filter which can be made compact, allows the matching of input/output impedance, and has preferable characteristics. A ground electrode is formed on one side of a dielectric substrate, and spiral-shaped pattern electrodes are formed on the other side. Input/output electrodes are led out from intermediate portions of the pattern electrodes. Curved portions are formed between the input/output electrodes and the ends of the pattern electrodes. The ends of the pattern electrodes are positioned close to each other. Protective layers are formed on the ground electrode and pattern electrodes, which are laminated and integrated to form external electrodes. The ends of the pattern electrodes and the ground electrode are connected by one of the external electrodes.

10 Claims, 11 Drawing Sheets

5,953,474	Sept. 14, 1999
Optical Fiber Coupler
Inventor:	Nagesh R. Basavanhally.
Assignee:	Lucent Technologies, Inc.
Filed:	Dec. 31, 1997.
Abstract— An optical coupler having two prongs extending axially therefrom
in opposite directions comprises a first connector comprising a first prong ex-
tending outwardly from a first end of a first elongated tubular member. A first
coupling sleeve is concentrically mounted around the first tubular member in ax-
ially movable, spring biased relation therewith. A second connector comprises
a second prong-containing tubular member fixedly telescoped within a second
end of the first tubular member. A second coupling sleeve is mounted in axi-
ally movable, spring biased relation with the second tubular member by pins
secured to and extending through the second coupling sleeve into engagement

with a spring mounted on the second tubular member.
11 Claims, 2 Drawing Sheets	5,956,437	Sept. 21, 1999
	Electrically Controllable Optical Attenuator
	Inventors:	Stephen Day and Terry Victor Clapp.
	Assignee:	Northern Telecom Limited.
	Filed:	Dec. 24, 1997.

Abstract— A known form of electrically controlled optical attenuator is formed by a mach Zehnder waveguide configuration with a variable refractive index element in one arm to modify the undulatory spectral characteristic of the network to give a specific attenuation at a specific wavelength. The spectral characteristic of the network makes the attenuation that it provides wavelength dependent. An attenuator with a wavelength dependence of reduced magnitude is provided by the series combination of two Mach Zehnder networks, one having an electrically controllable optical path length adjuster in its longer interference arm, and the other with its adjuster in its shorter arm.

IEEE MICROWAVE AND GUIDED WAVE LETTERS, VOL. 10, NO. 7, JULY 2000

297

	3 Claims, 12 Drawing Sheets	Each of the resonators has a corresponding plurality of embedded receptacles
		220, which contain an unmetallized area therein, adjacent to the plurality of
		metallized through-holes 214, providing a ring of isolation 222. A recessed
		channel 224 extends perpendicularly across each of the plurality of embedded
		receptacles 220 and has a groove 226 therein which is complementarily con-
		figured to receive a metallic shield 228. The metallic shield 228 is disposed
		in the recessed channel 224 and is connected to the metallization layer of the
		plurality of embedded receptacles 220. The metallic shield 228 is attached to
		the dielectric block with a design that reduces the size and volume of the filter
		200.
		35 Claims, 5 Drawing Sheets
5,959,506		Sept. 28, 1999
Coaxial Waveguide Corner
Inventor:	Donald Aves.
Filed:	May 4, 1998.

Abstract— A coaxial waveguide corner structure, having a pair of incoming inner conductors, each inner conductor having an axis and an end, the pair of inner conductors having noncoincident axes, and a conductive bridging element having two ends within an enclosure. Each end of the conductive bridging element is adapted to provide a continuous conductive surface between the outer edge of the pair of inner conductors, adapted to provide a low loss and low reflection radio frequency electromagnetic wave path between said pair of inner conductors. The conductive bridging element thus has a section profile matching a section profile of the adjoining inner conductor, at the respective bevel angles. The conductive bridging element preferably has a cross section shape different than a cross section shape of the conductors, preferably elliptical.

21 Claims, 3 Drawing Sheets

5,959,512 Sept. 28, 1999

Electronically Tuned Voltage Controlled Evanescent

	5,959,511	Sept. 28, 1999	Mode Waveguide Filter
	Ceramic Filter with Recessed Shield		Inventor:	James R. Sherman.
	Inventors:	Wayne Pasco, David Heine, and Michael Newell.	Assignee:	Raytheon Company.
			Filed:	Sept. 19, 1997.
	Assignee:	CTS Corporation.
	Filed:	Apr. 2, 1998.

Abstract— A ceramic filter with recessed shield 200 is provided. Filter 200 contains a filter body with a block of dielectric material having a top surface 202, a bottom surface 204, and side surfaces 206; 208; 210 and 212 respectively. Filter 200 also has a plurality of metallized through-holes 214 extending from the top surface 202 to the bottom surface 204 defining resonators.

Abstract— Tunable varactor diodes are utilized to adjust the filter frequency of a waveguide filter operating in evanescent mode. Because evanescent mode signals in a waveguide attenuate as they propagate, and because shunt capacitance between a waveguide and the surroundings can change the frequency at which the signals attenuate, controlling the shunt capacitance can filter the signals passing along the waveguide.

298 IEEE MICROWAVE AND GUIDED WAVE LETTERS, VOL. 10, NO. 7, JULY 2000

13 Claims, 3 Drawing Sheets 5,959,515 Sept. 28, 1999

High Q Integrated Resonator Structure

Inventors:	Kenneth D. Cornett, Branko Avanic, and David L. Stolfa.
Assignee:	Motorola, Inc.
Filed:	Aug. 11, 1997.

Abstract— A high Q integrated inductor-capacitor (L-C) resonator (200) includes a planar inductor (201) having a plurality of turns and a serially connected first and second capacitor (205; 207) that is connected in parallel with the planar inductor (201). The first and second capacitors (205; 207) are positioned within at least one turn of the planar inductor (201) for reducing the parasitic interconnection resistance between the planar inductor (201) and first and second capacitor (205; 207) and also increasing the Q factor of the L-C resonator.

10 Claims, 2 Drawing Sheets

5,959,514	Sept. 28, 1999
Coaxial Termination Arrangement
Inventors:	Adrian David Smith and Colin John Kellet.
Assignee:	Northern Telecom Limited.
Filed:	Apr. 2, 1997.

Abstract— A coaxial connector arrangement for transferring high frequency microwave signals between a coaxial cable and a further device is disclosed. In many present systems, the connector arrangement whereby microwave signals are passed from a coaxial cable to a device or the like at high frequencies has a tendency of radiating. Not only do the radiative emissions lose power, but this radiation can combine with the desired signals to form intermodulation products which further lose signal power and also distort the signal. The mating faces of the connector provide a malleable raised line portion which is disposed about the central conductor whereby a continuous line contact is defined on the mating components about the inner conductor, thereby preventing emission of high frequency signals which may interact with the intended signals.

4 Claims, 7 Drawing Sheets