Frequency sensor
First Claim
Patent Images
1. A frequency sensor comprising:
- a receiving antenna portion for receiving radio waves;
a transmitting antenna portion for radiating radio waves; and
a diode connected between said receiving and transmitting antenna portion, said diode serving to convert a high frequency signal induced in said receiving antenna portion into a signal of a higher frequency equivalent to an integral multiple of an input frequency, and supplying the converted signal to said transmitting antenna portion;
wherein said transmitting antenna portion is shaped into a closed loop and is disposed outside of said receiving antenna portion so as to arrange said transmitting and receiving antenna portions linearly.
1 Assignment
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Accused Products
Abstract
A small-sized thin frequency sensor developed for prevention of theft of an article. The frequency sensor comprises a receiving antenna portion to receive high frequency waves, and a transmitting antenna portion which is shaped into a closed loop with a diode incorporated therein and is disposed linearly to the receiving antenna portion to form an oblong rectangular contour as a whole.
23 Citations
22 Claims
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1. A frequency sensor comprising:
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a receiving antenna portion for receiving radio waves; a transmitting antenna portion for radiating radio waves; and a diode connected between said receiving and transmitting antenna portion, said diode serving to convert a high frequency signal induced in said receiving antenna portion into a signal of a higher frequency equivalent to an integral multiple of an input frequency, and supplying the converted signal to said transmitting antenna portion; wherein said transmitting antenna portion is shaped into a closed loop and is disposed outside of said receiving antenna portion so as to arrange said transmitting and receiving antenna portions linearly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A frequency sensor comprising:
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a rectangular receiving antenna portion having a longer side and a shorter side; a substantially U-shaped rectangular transmitting antenna portion having a longer side and a shorter side; and a diode connected between said receiving and transmitting antenna portions; wherein said longer sides of said receiving and transmitting antenna portions are disposed linearly so as to arrange said receiving and transmitting antenna portions linearly in direction of said longer sides of receiving and transmitting antenna portions, and the shorter side of said receiving antenna portion is equal in length to the shorter side of said transmitting antenna portion. - View Dependent Claims (10, 11, 12, 13)
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14. A frequency sensor comprising:
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a conductive antenna pattern consisting of a receiving antenna portion and a transmitting antenna portion; a diode connected between said receiving and transmitting antenna portions; a base film for attaching said antenna pattern; a spacer adhered onto said conductive antenna pattern; a seal member adhered onto said spacer so as to protect said diode; and upper and lower base sheets so adhered as to hold therein said conductive antenna pattern, diode, base film, spacer and seal member; wherein said transmitting antenna portion is shaped into a closed loop with said diode incorporated therein, and is disposed outside of said receiving antenna portion so as to arrange said transmitting and receiving antenna portions linearly. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification