Microwave transponder

• US 20050242960A1
• Filed: 04/22/2005
• Published: 11/03/2005
• Est. Priority Date: 04/22/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Ku, Ja-nam, Won, Jong-hwa, Tikov, Yuri
• Granted Patent: US 7,505,789 B2
• Time in Patent Office: Days
• US Class Current: 340/572.700
• CPC Class Codes: G06K 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
• CPC Class Codes: G06K 19/07786 the antenna being of the HF type, such as a dipole
• CPC Class Codes: 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

Abstract

A microwave transponder. The microwave transponder includes a conductive plate including an antenna, and a semiconductor chip disposed within a terminal gap located in a vicinity of a center of the conductive plate. A window of a predetermined shape is formed to extend from the terminal gap toward a side of the conductive plate. The perfect impedance matching is fulfilled even when the transponder is bent. Since the return loss of the electromagnetic power is reduced at least in a quarter through the impedance matching, the energy transferred to the transponder is maximized.

Claims

1. A microwave transponder comprising:

a conductive plate including an antenna;

a semiconductor chip disposed within a terminal gap substantially located in a center of the conductive plate; and

a window of a predetermined shape formed to extend from the terminal gap toward a side of the conductive plate.

2. The microwave transponder of claim 1, wherein the conductive plate is formed of a flexible material.

3. The microwave transponder of claim 1, wherein a length of the conductive plate is approximately 45% of an operating wavelength of a microwave in a free space.

4. The microwave transponder of claim 3, wherein a width of the conductive plate is approximately 5% of the length of the conductive plate.

5. The microwave transponder of claim 1, wherein the window matches impedances of the antenna and the semiconductor chip.

6. The microwave transponder of claim 1, wherein the predetermined shape of the window is a circular-shape.

7. The microwave transponder of claim 1, wherein the predetermined shape of the window is one of an ellipse-shape, a polygon-shape, and a curvilinear-shape.

8. The microwave transponder of claim 6, wherein the window has a maximal characteristic dimension to optimize an operating range depending on a bending degree of the conductive plate.

9. The microwave transponder of claim 8, wherein the maximal characteristic dimension is a diameter of the window.