PLANAR INVERTED-F WING ANTENNA FOR WIRELESS CULINARY APPLIANCES

• US 20160134009A1
• Filed: 11/05/2015
• Published: 05/12/2016
• Est. Priority Date: 05/09/2013
• Status: Active Grant

• Current Assignee: Microsemi Corporation (Microchip Technology Incorporated)
• Original Assignee: Knowles Capital Formation, Inc. (Knowles Corporation)
• Inventors: Sabah, Sabah
• Granted Patent: US 9,912,037 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01K 11/265 using surface acoustic wave [SAW]
• CPC Class Codes: G01K 2207/06 for preparation purposes
• CPC Class Codes: H01Q 1/22 by structural association with other equipment or articles
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence
• CPC Class Codes: H05B 2213/07 Heating plates with temperature control means

Abstract

A Planar Inverted-F Wing Antenna (PIFWA) device, system, and method used for commercial and residential induction cooking tops, ovens, combo-steamers, and pressure cookers. The outline of the PIFWA is an isosceles triangle with a truncated vertex end opposite the base side. The PIFWA transmits and receives (TX/RX) signals with wireless sensors including Surface Acoustic Wave (SAW) devices. The antenna comprises a device, system, and method to monitor the cooking process and temperature of food. Embodiments of the PIFWA antenna operate at about 433 MHz, have a feed between two slots, and a shorting plate at the opposing end. Antenna location and alignment within the culinary appliance provides uniform signal strength and gain performance in the regions occupied by one or more sensors.

Claims

1. A Planar Inverted-F Wing Antenna (PIFWA) device comprising:

a feed end;

a shorting end (345) opposite said feed end;

a feed section (315) between a first slot and a second slot;

a first wing section (305) on a side of said first slot opposite said feed section; and

a second wing section (310) on a side of said second slot opposite said feed section;

wherein outline configuration of said PIFWA in plane of said PIFWA is an isosceles triangle with a truncated vertex end opposite a base side;

said PIFWA device is located proximate a culinary appliance.

2. The Planar Inverted-F Wing Antenna (PIFWA) device of claim 1 wherein said culinary appliance is a cooktop (100).

3. The Planar Inverted-F Wing Antenna (PIFWA) device of claim 1 wherein said culinary appliance is an induction cooktop (215).

4. The Planar Inverted-F Wing Antenna (PIFWA) device of claim 1 wherein a feed side of said PIFWA is aligned perpendicular to an adjacent side of a cooktop, located proximate a corner of said cooktop (1505).

5. The Planar Inverted-F Wing Antenna (PIFWA) device of claim 1 wherein operating frequency (1910) of said PIFWA is about 433 MHz.

6. The Planar Inverted-F Wing Antenna (PIFWA) device of claim 1 wherein an impedance bandwidth (1925) for said antenna is at least about 13 MHz.

7. The Planar Inverted-F Wing Antenna (PIFWA) device of claim 1 wherein a maximum gain (2300) of said PIFWA is about 3.6 dB.

8. The Planar Inverted-F Wing Antenna (PIFWA) device of claim 1 wherein said culinary appliance is an oven (140).

9. The Planar Inverted-F Wing Antenna (PIFWA) device of claim 1 wherein said culinary appliance is selected from the group comprising a pressure cooker (145) and a combo-steamer (150).

10. The Planar Inverted-F Wing Antenna (PIFWA) device of claim 1 wherein said PIFWA communicates with a surface acoustic wave (SAW) sensor (110).

11. The Planar Inverted-F Wing Antenna (PIFWA) device of claim 1 wherein said PIFWA communicates with a surface acoustic wave (SAW) sensor (110) and values of measurements made by said sensor are used to control power (130) of said culinary appliance.

12. The Planar Inverted-F Wing Antenna (PIFWA) device of claim 1 wherein said PIFWA (1705) is located within a cooktop, said location (1700) comprising:

a shorting edge of said shorting end, said shorting edge parallel to and separated from a first inner side of said cooktop by about 76.8 mm measured perpendicular to said shorting edge;

a corner of said first wing, said corner of said first wing proximate a second inner side of said cooktop, said corner of said first wing separated from said second inner side of said cooktop by about 8.8 mm.

13. The Planar Inverted-F Wing Antenna (PIFWA) device of claim 1 wherein dimensions of said antenna (1800) comprise:

a shorting edge width approximately equal to a slot length;

an overall length approximately equal to an overall width;

a slot width approximately equal to one fifth of a wing end width; and

a feed leg width approximately one third of said slot width.

14. The Planar Inverted-F Wing Antenna (PIFWA) device of claim 1 wherein dimensions of said antenna (1800) comprise:

an overall length of about 118 mm;

an overall width of about 118 mm;

a wing width of about 47.5 mm;

a wing outer edge length of about 122.8 mm;

a feed leg width of about 3 mm;

slot widths of about 10 mm each;

a slot length of about 55 mm; and

an overall height (1810) of about 15.3 mm.

15. A method for measuring physical parameter values with a culinary appliance comprising the steps of:

providing at least one Planar Inverted-F Wing Antenna (PIFWA) (105) proximate said culinary appliance (2410);

wherein outline configuration of said PIFWA in plane of said PIFWA is an isosceles triangle with a truncated vertex end opposite a base side;

transmitting at least one RF signal from said at least one PIFWA (2420);

receiving at at least one wireless sensor (110), said RF signal transmitted from said PIFWA;

radiating from said at least one wireless sensor, at least one RF signal;

receiving, at said at least one PIFWA, said radiated signal from said at least one wireless sensor (2425);

said at least one RF signal transmitted from said at least one PIFWA and said at least one RF signal radiated from said at least one wireless sensor corresponding to said measured physical parameter values (2430).

16. The method of claim 15 wherein said at least one wireless sensor is a surface acoustic wave (SAW) sensor (110).

17. The method of claim 16 wherein said at least one surface acoustic wave (SAW) sensor is a temperature sensor.

18. The method of claim 15 wherein said culinary appliance is a cooktop (100).

19. The method of claim 15 wherein said at least one wireless sensor is a surface acoustic wave (SAW) temperature probe (110).

20. A system for measuring physical parameter values with a culinary appliance with a Planar Inverted-F Wing Antenna (PIFWA) comprising:

a PIFWA feed end;

a PIFWA shorting end (345) opposite said feed end;

a PIFWA feed section (315) between a first slot and a second slot, said feed section extending beyond line of a base side;

a PIFWA first wing section (305) on a side of said first slot opposite said feed section;

a PIFWA second wing section (310) on a side of said second slot opposite said feed section;

wherein outline configuration of said PIFWA in plane of said PIFWA is an isosceles triangle with a truncated vertex end opposite a base side;

said PIFWA is located proximate a culinary appliance; and

said PIFWA providing RF communication with a surface acoustic wave (SAW) sensor whereby values of measurements made by said sensor are used to control power (130) of said culinary appliance.