Devices, systems, and methods associated with RFID tag reader assemblies for use in barcode readers
In an embodiment, the present invention is a barcode and RFID tag reader that includes a head portion housing an imaging assembly, the imaging assembly configured to capture images of an environment appearing with a FOV extending through a window; a base portion housing an RFID tag reader assembly; and an intermediate portion extending between the head portion and the base portion. Preferably, the RFID tag reader assembly includes a chassis having a face directed towards the FOV and an antenna assembly at least partially contoured around the face of the chassis where the antenna assembly includes: a monopole flexible antenna having a first monopole antenna element having a first half and a second half, the first half and the second half being substantially symmetrical about a line of symmetry; and a dipole flexible antenna extending at least partially over at least a portion of the first monopole antenna element.
1. A barcode and radio frequency (RF) identification (RFID) tag reader comprising:
a head portion housing an imaging assembly, the imaging assembly configured to capture images of an environment appearing with a field of view (FOV) extending through a window;
a base portion housing an RFID tag reader assembly; and
an intermediate portion extending between the head portion and the base portion,
wherein the RFID tag reader assembly includes a chassis having a face directed towards the FOV and an antenna assembly at least partially contoured around the face of the chassis, and
wherein the antenna assembly includes:
a monopole flexible antenna having a first monopole antenna element positioned near a top portion of the face of the chassis and a second monopole antenna element positioned near a bottom portion of the face of the chassis; and
a dipole flexible antenna extending at least partially over at least a portion of the first monopole antenna element.
2. The barcode and RFID tag reader of claim 1 , wherein the head portion is substantially symmetrical about a central longitudinal plane, wherein the dipole flexible antenna includes a first dipole antenna element and a second dipole antenna element, and wherein each of the first dipole antenna element and the second dipole antenna element includes a respective feed point positioned near the central longitudinal plane.
3. The barcode and RFID tag reader of claim 2 , wherein the respective feed point of the first dipole antenna element is positioned on a first side of the central longitudinal plane and the respective feed point of the second dipole antenna element is positioned on a second side of the central longitudinal plane.
4. The barcode and RFID tag reader of claim 2 , wherein the each of the respective feed point of the first dipole antenna element and the respective feed point of the second dipole antenna element is positioned within 15 mm of the central longitudinal plane.
5. The barcode and RFID tag reader of claim 1 , wherein:
the first monopole antenna element has a first half and a second half, the first half being substantially symmetrical about a longitudinal centerline of the first monopole antenna element;
the dipole flexible antenna includes a first dipole antenna element and a second dipole antenna element;
the first dipole antenna element extends at least partially over at least a portion of the first half; and
the second dipole antenna element extends at least partially over at least a portion of the second half.
6. The barcode and RFID tag reader of claim 5 , wherein the first monopole antenna element further includes a flap section, the flap section being folded over a central portion of the first monopole antenna element.
7. The barcode and RFID tag reader of claim 5 , wherein the first monopole antenna element has a substantially winged shape.
8. The barcode and RFID tag reader of claim 1 , wherein the first dipole antenna element includes a first conductive trace having a respective feed point at one end and a respective open circuit at an opposite end, the first conductive trace further having a first conductive trace width and a first conductive trace length that is at least three times greater than the first conductive trace width.
9. The barcode and RFID tag reader of claim 8 ,
wherein the head portion is substantially symmetrical about a central longitudinal plane,
wherein the second dipole antenna element includes a second conductive trace having a respective feed point at one end and a respective open circuit at an opposite end, the second conductive trace further having a second conductive trace width and a second conductive trace length that is at least three times greater than the second conductive trace width, and
wherein the first conductive trace and the second conductive trace are positioned substantially symmetrically about the central longitudinal plane.
10. The barcode and RFID tag reader of claim 1 , wherein the second monopole antenna element is configured to act as a ground reference.
11. The barcode and RFID tag reader of claim 1 , wherein the chassis of the RFID tag reader assembly is positioned within the base portion above a horizontal printed circuit board (PCB), and wherein the horizontal PCB is connected to each of the monopole flexible antenna and the dipole flexible antenna via a respective cable.
12. The barcode and RFID tag reader of claim 1 , wherein the antenna assembly does not include a rigid printed circuit board.
13. The barcode and RFID tag reader of claim 1 , wherein the monopole flexible antenna is configured to emit vertically polarized RF radiation, and wherein the dipole flexible antenna is configured to emit horizontally polarized RF radiation.
14. The barcode and RFID tag reader of claim 1 , wherein the RFID tag reader assembly is configured to operate within a predetermined radio frequency range,
wherein the dipole flexible antenna includes an electrical circuit having a plurality of conductive traces, and
wherein a length of the electrical circuit is less than or equal to half-wavelength of any wavelength within the predetermined radio frequency range.
15. The barcode and RFID tag reader of claim 14 , wherein the length of the electrical circuit is less than or equal to three eighth of the any wavelength within the predetermined radio frequency range.
16. The barcode and RFID tag reader of claim 14 , wherein the length of the electrical circuit is less than half-wavelength of the any wavelength within the predetermined radio frequency range, and
wherein the electrical circuit includes at least one tuning component configured to cause the dipole flexible antenna to resonate within the predetermined radio frequency range.
17. A barcode and radio frequency (RF) identification (RFID) tag reader comprising:
a head portion housing an imaging assembly, the imaging assembly configured to capture images of an environment appearing with a field of view (FOV) extending through a window;
a base portion housing an RFID tag reader assembly; and
an intermediate portion extending between the head portion and the base portion,
wherein the RFID tag reader assembly includes a chassis having a face directed towards the FOV and an antenna assembly at least partially contoured around the face of the chassis, and
wherein the antenna assembly includes:
a monopole flexible antenna having a first monopole antenna element having a first half and a second half, the first half and the second half being substantially symmetrical about a line of symmetry; and
a dipole flexible antenna extending at least partially over at least a portion of the first monopole antenna element.
18. The barcode and RFID tag reader of claim 17 , wherein the dipole flexible antenna includes a first dipole antenna element and a second dipole antenna element, wherein the first dipole antenna element extends at least partially over at least a portion of the first half, and wherein the second dipole antenna element extends at least partially over at least a portion of the second half.
19. The barcode and RFID tag reader of claim 17 , wherein the first monopole antenna element further includes a flap section, the flap section being folded over a central portion of the first monopole antenna element.
20. The barcode and RFID tag reader of claim 17 , wherein the first monopole antenna element has a substantially winged shape.
21. The barcode and RFID tag reader of claim 17 , wherein the antenna assembly does not include a rigid printed circuit board.
22. The barcode and RFID tag reader of claim 17 , wherein the RFID tag reader assembly is configured to operate within a predetermined radio frequency range,
wherein the dipole flexible antenna includes an electrical circuit having a plurality of conductive traces, and
wherein a length of the electrical circuit is less than or equal to half-wavelength of any wavelength within the predetermined radio frequency range.
23. The barcode and RFID tag reader of claim 22 , wherein the length of the electrical circuit is less than or equal to three eighth of the any wavelength within the predetermined radio frequency range.