# US 8,740,090 B2 · Ruggedized RFID tag and reader

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- Number: US 8,740,090 B2
- Document ID: US8740090B2
- Status: Granted
- Kind: B2
- Application number: 12/228,428
- Filed: 2008-08-11
- Published: 2010-06-17
- Granted: 2014-06-03
- Earliest claimed: 2005-07-12
- Applicants: Martin S. Casden
- Inventors: Martin S. Casden
- Web page: https://patentgrep.com/patent/US8740090B2

## CPC

- G06K 7/10336: {the antenna being of the near field type, inductive coil}
- G08B 13/2474: {Antenna or antenna activator geometry, arrangement or layout (loop antennae H01Q1/22)}
- H01Q 1/2208: {associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems (methods or arrangements for sensing record carriers, e.g. for reading patterns G06K7/00; record carrier for use with machines and with at least a part designed to carry digital markings G06K19/00)}
- H01Q 1/2216: {used in interrogator/reader equipment}
- H01Q 1/44: using equipment having another main function to serve additionally as an antenna {, e.g. means for giving an antenna an aesthetic aspect}(H01Q1/27 - H01Q1/34 take precedence)
- H01Q 7/00: Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q 9/27: Spiral antennas
- H01Q 13/08: Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
- H01Q 13/10: Resonant slot antennas
- G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

A radio frequency identification (RFID) transponder tag is contained in and electrically connected to a mechanically rugged metallic tag housing slotted to define a radio frequency antenna, such as a half turn antenna, and sealed with an epoxy filling.

## Claims

### Claim 1

In combination, a housing made at least partially of electrically conductive material, said housing shaped and configured to define a radio frequency radiating antenna including a pair of antenna lobes formed integrally with said housing, an RFID transponder circuit contained within and mechanically protected by said housing, and an antenna matching circuit having a pair of outputs each electrically connected to a corresponding one of said antenna lobes operatively connecting said transponder circuit with said antenna.

### Claim 2 (depends on 1)

The combination of claim 1 wherein said housing is made of metal.

### Claim 3 (depends on 1)

The combination of claim 1 wherein said housing is made of relatively thick material for substantially protecting said radio frequency circuits from damage caused by physical abuse of said housing.

### Claim 4 (depends on 1)

The combination of claim 1 wherein said housing is slotted for defining said antenna lobes.

### Claim 5 (depends on 1)

The combination of claim 1 wherein said housing has one or more slots for defining said antenna lobes and said one or more slots are filled with nonconductive material for closing said slots against entry of foreign matter into said housing.