Device for information transmission
First Claim
1. A device for information transmission for receiving a first microwave signal, remodulating and coding said first microwave signal to produce a transponder signal, and retransmitting said transponder signal as a second microwave signal, said device comprising:
- a ground plane;
at least one microstrip antenna including an antenna layer acting towards said ground plane, said antenna layer and said ground plane having substantially equal areas; and
a reflex means, arranged adjacent to or at a distance of less than 1/6 of the air wave length of the first microwave signal from the radiating edges of said antenna layer, said reflex means arranged to reflect the second microwave signal radiating from the radiating edges of said antenna layer and edges of said ground plane so as to generate an antenna lobe, directional from said microstrip antenna comprising a directly transmitted microwave signal and a reflected microwave signal.
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Accused Products
Abstract
A device for information transmission, a so-called transponder, for receiving a first microwave signal, modulating and coding, and retransmitting a second microwave signal, having at least one antenna made in microstrip technique is described. The device is characterized primarily in that the antenna has an antenna layer (20), acting towards a ground plane (21), the antenna layer and the ground plane essentially equal area, and in that the device further having a reflex position (23 ), arranged next to or at a distance of at most 1/6 of the air wave length of the first microwave signal from the edges of the antenna layer and the ground plane, so that an antenna lobe directional from the antenna is obtained, including directly transmitted microwave signal and reflected microwave signal. With this embodiment a device is obtained that is compact, effective, light and inexpensive and gives well defined and directional antenna lobe for communications with good range.
84 Citations
20 Claims
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1. A device for information transmission for receiving a first microwave signal, remodulating and coding said first microwave signal to produce a transponder signal, and retransmitting said transponder signal as a second microwave signal, said device comprising:
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a ground plane; at least one microstrip antenna including an antenna layer acting towards said ground plane, said antenna layer and said ground plane having substantially equal areas; and a reflex means, arranged adjacent to or at a distance of less than 1/6 of the air wave length of the first microwave signal from the radiating edges of said antenna layer, said reflex means arranged to reflect the second microwave signal radiating from the radiating edges of said antenna layer and edges of said ground plane so as to generate an antenna lobe, directional from said microstrip antenna comprising a directly transmitted microwave signal and a reflected microwave signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A transponder comprising:
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a ground plane; an antenna including an antenna layer acting towards said ground plane, said antenna layer and said ground plane having substantially equal areas, for receiving a first microwave signal and transmitting a second microwave signal; and remodulating and coding means, coupled to said antenna, for remodulating and coding said first microwave signal to produce a transponder signal for retransmission as the second microwave signal; wherein said antenna further comprises a reflex means, arranged adjacent to or at a distance of less than 1/6 of the air wave length of the first microwave signal from the radiating edges of said antenna layer, said reflex means arranged to reflect the second microwave signal radiating from the radiating edges of said antenna layer and edges of said ground plane so as to generate an antenna lobe, directional from said antenna comprising a directly transmitted microwave signal and a reflected microwave signal.
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Specification