EP0646983A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Modulated backscatter microstrip patch antenna
Assignee: Amtech Corp
•
Filing: 1994-06-10
•
Granted: —
•
Expires: 2014-06-10
Abstract
Abstract The invention provides a microstrip patch antenna for emitting backscatter-modulated signals in response to a received signal. The antenna has two segments that are connected together by a switch. When the switch is ON, the antenna is a full wave length antenna with its two segments out-of-phase with each other, thus producing minimal backscatter. When the switch is OFF, the two segments of the antenna act in concert with each other to produce a backscatter-modulated signal. Multiple pairs of such antennas can be connected together to make a single antenna with increased signal power.
Inventors
- 👤 Richard L. Veghte
- 👤 Curtis L. Carrender
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 09:06
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10009; G06K7/10316; G06K7/10346; G01; G01S; G01S13/00; G01S13/74; G01S13/75; G01S13/751; G01S13/756; G06K19/00; G06K19/06; G06K19/067; G06K19/07; G06K19/0723; G06K19/077; G06K19/07749; G06K19/07773; G06K19/07786; H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/32; H01Q1/3208; H01Q1/3233; H01Q1/36; H01Q1/38; H01Q21/00; H01Q21/29; H01Q21/293; H01Q3/00; H01Q3/44; H01Q3/46; H01Q9/00; H01Q9/04; H01Q9/0407; H01Q9/0442
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
71 words
A microstrip patch antenna for emitting backscatter-modulated signals in response to a received signal, said antenna comprising two segments connected together by a switch, said antenna being a full wave length antenna with its two segments out-of-phase with each other when the switch in ON, whereby minimal backscatter signal is produced, and the two segments of said antenna acting in concert when the switch is OFF, thereby producing a backscatter-modulated signal.
Claim 2
Dependent Claim
24 words
The microstrip patch antenna of claim 1 further including a circuit which turns said switch ON or OFF in response to an external signal.
Claim 3
Dependent Claim
17 words
The microstrip patch antenna of claim 2 wherein said external signal is part of the received signal.
Claim 4
Dependent Claim
21 words
The microstrip patch antenna of claim 2 wherein one of said segments has an input line for receiving said external signal.
Claim 5
Dependent Claim
36 words
The microstrip patch antenna of claim 2 wherein said circuit contains temporary memory for holding received data, and wherein one of said segments has an input line connected to it for writing data into the memory.
Claim 6
Dependent Claim
22 words
The microstrip patch antenna of claim 4 wherein both segments have input lines connected to them for writing data into the memory.
Claim 7
Dependent Claim
22 words
The microstrip patch antenna of claim 5 wherein both segments have input lines connected to them for writing data into the memory.
Claim 8
Dependent Claim
22 words
The microstrip patch antenna of claim 4 wherein said input line is located on the side of the segment opposite the switch.
Claim 9
Dependent Claim
28 words
The microstrip patch antenna of claim 6 wherein each of the input lines is located on a respective one of the segments on a side opposite the switch.
Claim 10
Dependent Claim
28 words
The microstrip patch antenna of claim 7 wherein each of the input lines is located on a respective one of the segments on a side opposite the switch.
Claim 11
Dependent Claim
15 words
The microstrip patch antenna of claim 1 wherein each of the segments has circular polarization.
Claim 12
Dependent Claim
71 words
A microstrip patch antenna for emitting backscatter-modulated signals in response to a received signal, said antenna comprising two segments connected together by a switch, said antenna being a half wave length antenna with its two segments out-of-phase with each other when the switch in ON, whereby minimal backscatter signal is produced, and the two segments of said antenna acting in concert when the switch is OFF, thereby producing a backscatter-modulated signal.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.