IP Library › Granted Patent US 7,075,389
Granted Patent B1
US 7,075,389 · App. 09/580,504 · Granted Jul 11, 2006

Method and apparatus for achieving broadband matching of narrow-band resonator filter impedances to loads and sources

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Quick Facts
Patent No.
US 7,075,389
App. No.
09/580,504
Granted
Jul 11, 2006
Kind
B1
Abstract

A circuit for matching the impedance of a narrow-band resonator filter presented to a port over a broad range of frequencies employs a second resonator that has substantially the same transfer characteristic as the resonator filter. The resonator filter is isolated from the output port using a resonator having a dual characteristic that behaves as a short circuit in the pass-band of the resonator filter, and is an open circuit in the stop-band of the resonator filter. The second resonator is isolated from the port using a resistor that has a value on the order of the ideal or desired impedance to be presented at the port. The circuit provides an impedance at the port that is approximately equal to the desired impedance in the stop-band, and an impedance that is slightly degraded in the pass-band, and particularly at the on-frequency of the resonator filter. The circuit is particularly useful when narrow band-pass resonator filters are employed in broadband multichannel systems coupled to the input ports of an impedance sensitive load, such as a passive mixers used to perform frequency conversion over a wide range of frequencies.

Claims (9)

1. An apparatus for substantially matching the impedance of a resonator filter to a desired impedance at a port, said apparatus comprising:

a first resonator filter having an input coupled to a signal and further having an output transfer characteristic;

a second resonator having an output characteristic substantially the same as said first resonator;

an isolation resonator coupled between said first resonator and said port;

an isolation resistor coupled between said second resonator and said port;

wherein said isolation resonator has an impedance characteristic that is complementary to said first resonator filter.

2. The apparatus of claim 1 wherein said second resonator is identical to said first resonator filter.

3. The apparatus of claim 1 wherein said first resonator is a double-tuned parallel resonator.

4. The apparatus of claim 1 wherein the second resonator is a truncation of said first resonator filter.

Assignments (11)
RELEASE OF SECURITY INTEREST AT REEL/FRAME 049905/0504 Recorded Dec 19, 2024
From: JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT
To: ARRIS ENTERPRISES LLC (F/K/A ARRIS ENTERPRISES, INC.); ARRIS TECHNOLOGY, INC.; ARRIS SOLUTIONS, INC.; COMMSCOPE, INC. OF NORTH CAROLINA; COMMSCOPE TECHNOLOGIES LLC; RUCKUS WIRELESS, LLC (F/K/A RUCKUS WIRELESS, INC.)
Reel/Frame 071477/0255 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 23, 2022
From: ARRIS TECHNOLOGY, INC.
To: ARRIS ENTERPRISES, INC.
Reel/Frame 060791/0583 →
PATENT SECURITY AGREEMENT Recorded Jul 3, 2019
From: ARRIS ENTERPRISES LLC
To: WILMINGTON TRUST, NATIONAL ASSOCIATION, AS COLLATERAL AGENT
Reel/Frame 049820/0495 →
TERM LOAN SECURITY AGREEMENT Recorded Jul 3, 2019
From: COMMSCOPE, INC. OF NORTH CAROLINA; COMMSCOPE TECHNOLOGIES LLC; ARRIS ENTERPRISES LLC; ARRIS TECHNOLOGY, INC.; RUCKUS WIRELESS, INC.; ARRIS SOLUTIONS, INC.
To: JPMORGAN CHASE BANK, N.A.
Reel/Frame 049905/0504 →
ABL SECURITY AGREEMENT Recorded Jul 3, 2019
From: COMMSCOPE, INC. OF NORTH CAROLINA; COMMSCOPE TECHNOLOGIES LLC; ARRIS ENTERPRISES LLC; ARRIS TECHNOLOGY, INC.; RUCKUS WIRELESS, INC.; ARRIS SOLUTIONS, INC.
To: JPMORGAN CHASE BANK, N.A.
Reel/Frame 049892/0396 →
CHANGE OF NAME Recorded Jul 2, 2019
From: ARRIS ENTERPRISES, INC.
To: ARRIS ENTERPRISES LLC
Reel/Frame 049649/0062 →
TERMINATION AND RELEASE OF SECURITY INTEREST IN PATENTS Recorded Apr 8, 2019
From: BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT
To: ARRIS GROUP, INC.; ARRIS ENTERPRISES, INC.; ARRIS SOLUTIONS, INC.; ARRIS KOREA, INC.; ARRIS HOLDINGS CORP. OF ILLINOIS, INC.; BIG BAND NETWORKS, INC.; TEXSCAN CORPORATION; POWER GUARD, INC.; 4HOME, INC.; ACADIA AIC, INC.; AEROCAST, INC.; BROADBUS TECHNOLOGIES, INC.; GENERAL INSTRUMENT CORPORATION; GENERAL INSTRUMENT AUTHORIZATION SERVICES, INC.; GENERAL INSTRUMENT INTERNATIONAL HOLDINGS, INC.; IMEDIA CORPORATION; JERROLD DC RADIO, INC.; LEAPSTONE SYSTEMS, INC.; MODULUS VIDEO, INC.; MOTOROLA WIRELINE NETWORKS, INC.; NETOPIA, INC.; NEXTLEVEL SYSTEMS (PUERTO RICO), INC.; QUANTUM BRIDGE COMMUNICATIONS, INC.; SETJAM, INC.; SUNUP DESIGN SYSTEMS, INC.; UCENTRIC SYSTEMS, INC.; GIC INTERNATIONAL HOLDCO LLC; GIC INTERNATIONAL CAPITAL LLC; CCE SOFTWARE LLC; THE GI REALTY TRUST 1996
Reel/Frame 048825/0294 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 18, 2015
From: ARRIS TECHNOLOGY, INC
To: ARRIS ENTERPRISES, INC.
Reel/Frame 037328/0341 →
MERGER AND CHANGE OF NAME Recorded Mar 10, 2015
From: GENERAL INSTRUMENT CORPORATION; GENERAL INSTRUMENT CORPORATION
To: ARRIS TECHNOLOGY, INC.
Reel/Frame 035176/0620 →
SECURITY AGREEMENT Recorded May 28, 2013
From: ARRIS GROUP, INC.; ARRIS ENTERPRISES, INC.; ARRIS SOLUTIONS, INC.; ARRIS KOREA, INC.; ARRIS HOLDINGS CORP. OF ILLINOIS; BIGBAND NETWORKS, INC.; TEXSCAN CORPORATION; POWER GUARD, INC.; 4HOME, INC.; ACADIA AIC, INC.; AEROCAST, INC.; BROADBUS TECHNOLOGIES, INC.; GENERAL INSTRUMENT CORPORATION; GENERAL INSTRUMENT AUTHORIZATION SERVICES, INC.; GENERAL INSTRUMENT INTERNATIONAL HOLDINGS, INC.; IMEDIA CORPORATION; JERROLD DC RADIO, INC.; LEAPSTONE SYSTEMS, INC.; MODULUS VIDEO, INC.; MOTOROLA WIRELINE NETWORKS, INC.; NETOPIA, INC.; NEXTLEVEL SYSTEMS (PUERTO RICO), INC.; QUANTUM BRIDGE COMMUNICATIONS, INC.; SETJAM, INC.; SUNUP DESIGN SYSTEMS, INC.; UCENTRIC SYSTEMS, INC.; GIC INTERNATIONAL HOLDCO LLC; GIC INTERNATIONAL CAPITAL LLC; CCE SOFTWARE LLC; THE GI REALTY TRUST 1996
To: BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT
Reel/Frame 030498/0023 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 20, 2009
From: BROADBAND INNOVATIONS, INC.
To: GENERAL INSTRUMENT CORPORATION
Reel/Frame 023546/0695 →