Time domain radio transmission system

• US 5,969,663 A
• Filed: 11/25/1997
• Issued: 10/19/1999
• Est. Priority Date: 06/03/1986
• Status: Expired due to Fees

• Current Assignee: Time Domain Corporation (Humatics Corporation)
• Original Assignee: Time Domain Corporation (Humatics Corporation)
• Inventors: Fullerton, Larry W., Barnes, Mark A.
• Primary Examiner(s): Gregory, Bernarr E.
• Application Number:
  US08/978,367
• Time in Patent Office: 693 Days
• Field of Search: 359/238, 359/240, 359/245, 359/247, 359/254, 359/296, 359/255, 359/256, 359/257, 359/258, 359/278, 359/250, 359/259, 359/262, 359/276, 380/34, 342/21, 342/22, 342/27, 342/28, 342/118, 342/120, 342/127, 342/132, 342/134, 342/145, 342/201, 375/200, 375/201, 375/202, 375/203, 375/204, 375/206, 375/207, 375/208, 375/209, 375/210, 375/256, 375/259, 375/239, 375/343, 375/367
• US Class Current: 342/27
• CPC Class Codes: H01Q 9/28 Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines waveguide horns or mouths H01Q13/00; slot antennas H01Q13/00
• CPC Class Codes: H01Q 9/40 Element having extended radiating surface
• CPC Class Codes: H04B 1/71635 Transmitter aspects H04B1/7174 takes precedence
• CPC Class Codes: H04B 1/71637 Receiver aspects H04B1/7183 takes precedence
• CPC Class Codes: H04L 27/103 Chirp modulation for spread spectrum techniques H04B1/69

Abstract

A time domain communications system wherein a broadband of time-spaced signals, essentially monocycle-like signals, are derived from applying stepped-in-amplitude signals to a broadband antenna, in this case, a reverse bicone antenna. When received, the thus transmitted signals are multiplied by a D.C. replica of each transmitted signal, and thereafter, they are, successively, short time and long time integrated to achieve detection.

Claims

1. A wideband electromagnetic system comprising:

generating means for generating stepped amplitude signals;

transmitting means responsive to said stepped amplitude signals and including a wideband antenna for transmitting wideband burst signals, said antenna comprising at least one dipole and wherein each dipole is substantially of the same length and includes two generally triangular elements characterized by having a like broad base and narrow apex; and

receiving means for detecting signals derived from transmitted burst signals.

2. A system as set forth in claim 1 wherein said receiving means comprises coherent detection means responsive to times of initiation of said burst signals.

3. A system as set forth in claim 1 wherein said coupling is to the bases of said antenna elements.

4. A light modulation system comprising:

a source of narrow band light;

an elongated optical channel having an entrance end for receiving light from said source and an exiting end and having a refractive index variable by an electrical field;

conductive means extending along said optical channel for applying an electrical field across said optical channel; and

signal means for generating a modulation signal and applying said signal to said conductive means in a region adjacent to said exiting end of said optical channel and thereby creating said electrical field therein;

whereby light from said light source passing from said entrance end to said exit end of said optical channel is affected by said electrical field, whereby the frequency of light passing through said optical channel is varied in frequency as a function of said signal.

5. A system as set forth in claim 4 wherein said conductive means comprises first and second elongated conductors positioned on opposite sides of said optical channel.