US6515633B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio frequency isolation card
Assignee: Commscope Technologies LLC
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Filing: 2001-11-15
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Granted: 2003-02-04
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Expires: 2021-11-15
Abstract
Abstract One or more feedback elements generate a feedback signal in response to a transmitted signal outputted by each radiator of the antenna system. This feedback signal is received by each radiator, also described as a radiating element, and combined with any leakage signal present at the port of the antenna. Because the feedback signal and the leakage signal are set to the same frequency and are approximately 180 degrees out of phase, this signal summing operation serves to cancel both signals at the output port, thereby improving the port-to-port isolation characteristic of the antenna. Each feedback element can include a photo-etched planar metal strip supported by a planar dielectric card made from printed circuit board material. Such feedback elements can provide a high degree of repeatability and reliability in that the manufacturing of such feedback elements can be precisely controlled.
Inventors
- 👤 Joseph R. Ippolito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:32
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/22; H01Q1/24; H01Q1/241; H01Q1/246; H01Q1/52; H01Q1/521; H01Q1/523; H01Q21/00; H01Q21/06; H01Q21/08; H01Q21/24; H01Q21/26
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
143 words
An antenna system comprising: a plurality of antenna elements; a feed network, coupled to each of the antenna elements, for communicating the electromagnetic signals from and to each of the antenna elements; and a feedback system coupled relative to the feed network and the antenna elements for generating a feedback signal to at least one of the antenna elements, the feedback system comprising at least one planar conductive strip disposed on a side of a planar dielectric support, the planar conductive strip having a length, width, and thickness wherein the length and width are larger than the thickness, the conductive strip generating the feedback signal in response to receiving the electromagnetic signals transmitted by the antenna elements, the feedback signal operative to cancel a leakage signal present at the feed network and thereby increase the port to port isolation of the antenna system.
Claim 2
Dependent Claim
143 words
An antenna system comprising: a plurality of antenna elements; a feed network, coupled to each of the antenna elements, for communicating the electromagnetic signals from and to each of the antenna elements; and a feedback system coupled relative to the feed network and the antenna elements for generating a feedback signal to at least one of the antenna elements, the feedback system comprising at least one planar conductive strip disposed on a side of a planar dielectric support, the planar conductive strip having a length, width, and thickness wherein the length and width are larger than the thickness, the conductive strip generating the feedback signal in response to receiving the electromagnetic signals transmitted by the antenna elements, the feedback signal operative to cancel a leakage signal present at the feed network and thereby increase the port to port isolation of the antenna system.
Claim 3
Dependent Claim
38 words
The antenna system of claim 1 , wherein the antenna elements comprise dual polarized radiators, the feedback system increasing the isolation between polarizations whereby leakage signals present at ports of the feed network are substantially reduced or eliminated.
Claim 4
Dependent Claim
15 words
The antenna system of claim 2 , wherein the dual polarized radiators comprise crossed dipoles.
Claim 5
Dependent Claim
39 words
The antenna system of claim 1 , wherein the antenna elements comprise radiators operating in multiple frequency bands, the feedback system increasing isolation between frequency bands whereby leakage signals present at ports of the feed network are substantially reduced.
Claim 6
Dependent Claim
18 words
The antenna system of claim 4 , wherein the radiators operating in multiple frequency bands comprise patch radiators.
Claim 7
Dependent Claim
51 words
The antenna system of claim 1 , wherein the planar conductive strip is a first planar conductive strip disposed and the side of the planar dielectric support is a first side, the feedback system further comprising a second planar conductive strip disposed on a second side of the planar dielectric support.
Claim 8
Dependent Claim
49 words
The antenna system of claim 1 , further comprising a ground plane and a printed circuit board, the antenna elements being connected to the printed circuit board, the printed circuit board and the ground plane further comprising a slot for receiving an end portion of the planar dielectric support.
Claim 9
Dependent Claim
32 words
The antenna system of claim 7 , further comprising a plurality of slots disposed in the ground plane and printed circuit board, the slots being positioned between respective pairs of antenna elements.
Claim 10
Dependent Claim
17 words
The antenna system of claim 1 , wherein the planar conductive strip comprises electro-deposited or rolled copper.
Claim 11
Dependent Claim
19 words
The antenna system of claim 1 , wherein the planar conductive strip is photo-etched on the planar dielectric support.
Claim 12
Dependent Claim
26 words
The antenna system of claim 1 , wherein the length of the planar conductive strip is approximately three-fifths of an operating wavelength of the antenna elements.
Claim 13
Dependent Claim
29 words
The antenna system of claim 1 , wherein the length of the planar conductive strip is approximately between 0.4 to 0.6 of an operating wavelength of the antenna elements.
Claim 14
Dependent Claim
23 words
The antenna system of claim 1 , wherein the length of the planar conductive strip is approximately an unequal number of half wavelengths.
Claim 15
Dependent Claim
36 words
The antenna system of claim 1 , wherein the planar conductive strip is disposed at a height above a ground plane of the antenna system that is substantially equal to a height of an antenna element.
Claim 16
Dependent Claim
29 words
The antenna system of claim 1 , wherein the planar dielectric support and the planar conductive strip are disposed at an angle relative to one of the antenna elements.
Claim 17
Dependent Claim
30 words
The antenna system of claim 1 , further comprising a plurality of planar dielectric supports having respective planar conductive strips, the planar dielectric supports having non-uniform spacing between each other.
Claim 18
Dependent Claim
43 words
The antenna system of claim 1 , further comprising a plurality of planar dielectric supports having respective planar conductive strips, the planar dielectric supports being positioned between respective pairs of antenna elements and being oriented at various rotational angles relative to each other.
Claim 19
Dependent Claim
45 words
The antenna system of claim 1 , further comprising a plurality of planar dielectric supports having respective planar conductive strips, the planar dielectric supports having substantially uniform spacing between each other, wherein a planar dielectric support is positioned between a respective pair of antenna elements.
Claim 20
Dependent Claim
22 words
The antenna system of claim 18 , wherein the uniform spacing comprises a length of approximately three quarters of an operating wavelength.
Claim 21
Dependent Claim
43 words
The antenna system of claim 1 , wherein the planar conductive strip is a first planar conductive strip, the feedback system further comprising a second planar conductive strip disposed on the side of the planar dielectric support with the first planar conductive strip.
Claim 22
Dependent Claim
42 words
The antenna system of claim 1 , further comprising a plurality of stacked planar dielectric supports having respective planar conductive strips, wherein each stacked planar dielectric support comprises at least two planar dielectric supports positioned at an angle relative to each other.
Claim 23
Dependent Claim
22 words
The antenna system of claim 1 , wherein the planar dielectric support comprises a dielectric material having a dielectric constant of 3.86.
Claim 24
Dependent Claim
28 words
The antenna system of claim 1 , wherein the planar dielectric support comprises a dielectric material having a dielectric constant within a range between approximately 2.0 and 6.0.
Claim 25
Dependent Claim
23 words
The antenna system of claim 1 , wherein the planar dielectric support comprises a dielectric material having a dissipation factor of approximately 0.019.
Claim 26
Dependent Claim
30 words
The antenna system of claim 1 , further comprising a ground plane and a grounding element that provides a dc connection between the ground plane and the planar conductive strip.
Claim 27
Dependent Claim
23 words
The antenna system of claim 25 , wherein the grounding element comprises one of a high impedance meandering line and a conductive strip.
Claim 28
Independent Claim
128 words
A method for increasing isolation between ports of an antenna system, comprising the steps of: coupling a first port to a first feed network; coupling the first feed network to a first set of antenna elements; coupling a second port to a second feed network; coupling the second feed network to a second set of antenna elements; electromagnetically coupling a feedback system to the first and second feed networks and to the first set and second set of antenna elements, the feedback system comprising at least one planar conductive strip disposed on a side of a planar dielectric support; generating a feedback signal in response to receiving the electromagnetic signals transmitted by the antenna elements; and canceling a leakage signal at the feed network with the feedback signal.
Claim 29
Independent Claim
128 words
A method for increasing isolation between ports of an antenna system, comprising the steps of: coupling a first port to a first feed network; coupling the first feed network to a first set of antenna elements; coupling a second port to a second feed network; coupling the second feed network to a second set of antenna elements; electromagnetically coupling a feedback system to the first and second feed networks and to the first set and second set of antenna elements, the feedback system comprising at least one planar conductive strip disposed on a side of a planar dielectric support; generating a feedback signal in response to receiving the electromagnetic signals transmitted by the antenna elements; and canceling a leakage signal at the feed network with the feedback signal.
Claim 30
Dependent Claim
77 words
The method of claim 27 , wherein the step of coupling the first feed network to a first set of antenna elements further comprises coupling the first feed network to a first set of antenna elements operating at a first polarization and wherein the step of coupling the second feed network to a second set of antenna elements further comprises coupling the second feed network to a second set of antenna elements operating at a second polarization.
Claim 31
Dependent Claim
79 words
The method of claim 27 , wherein the step of coupling the first feed network to a first set of antenna elements further comprises coupling the first feed network to a first set of antenna elements operating at a first frequency range and wherein the step of coupling the second feed network to a second set of antenna elements further comprises coupling the second feed network to a second set of antenna elements operating at a second frequency range.
Claim 32
Dependent Claim
21 words
The method of claim 27 , further comprising the step of forming the planar conductive strip with electro-deposited or rolled copper.
Claim 33
Dependent Claim
21 words
The method of claim 27 , further comprising the step of photo-etching the planar conductive strip on the planar dielectric support.
Claim 34
Dependent Claim
30 words
The method of claim 27 , further comprising the step of sizing the planar conductive strip to a length of approximately three-fifths of an operating wavelength of the antenna elements.
References Cited (Backward Citations)
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