# US 2017/0257084 A1 · Ultrashort high power pulse generator

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- Number: US 2017/0257084 A1
- Document ID: US20170257084A1
- Status: Published application
- Kind: A1
- Application number: 15/452,287
- Filed: 2017-03-07
- Published: 2017-09-07
- Earliest claimed: 2016-03-07
- Assignees: The United States of America as represented by the Secretary of the Navy
- Applicants: The Government of the United States of America, as represented by the Secretary of the Navy
- Inventors: Victor M. Mendez; Sun K. Hong; Jerry T. Kim
- Web page: https://patentgrep.com/patent/US20170257084A1

## CPC

- H03K 5/08: by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding (H03K5/07 takes precedence; comparing one pulse with another H03K5/22; providing a determined threshold for switching H03K17/30)
- G01S 7/282: Transmitters
- H01P 7/06: Cavity resonators
- H03K 5/07: by the use of resonant circuits
- H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M)
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)

## Abstract

A method of generating a high-power Radio-Frequency ultrashort waveform comprising the steps of generating an input waveform at a relatively low power level from an impulse response characteristic of a reverberant cavity via one-bit quantization and time reversal; generating an amplified input waveform of a power higher than the input waveform via feeding the input waveform into one or more amplifiers; generating a compressed ultrashort pulse having a high power relative to the amplified input waveform via feeding the amplified input waveform into the reverberant cavity.

## Claims

### Claim 1

A method of generating a high-power Radio-Frequency ultrashort waveform comprising the steps of:
generating an input waveform at a relatively low power level from an impulse response characteristic of a reverberant cavity via one-bit quantization and time reversal; and
generating a compressed ultrashort pulse having a high power relative to the input waveform via feeding the input waveform into the reverberant cavity.

### Claim 2 (depends on 1)

The method of claim 1, wherein feeding the input waveform into the reverberant cavity includes the step of generating an amplified input waveform of a power higher than the input waveform via feeding the input waveform into one or more amplifiers, and feeding the amplified input waveform into the reverberant cavity.

### Claim 3 (depends on 1)

The method of claim 1, further comprising the step of measuring an impulse response of the cavity to obtain the impulse response characteristic of the reverberant cavity.

### Claim 4 (depends on 1)

The method of claim 1, wherein the input waveform is of uniform amplitude.

### Claim 5 (depends on 1)

The method of claim 1, wherein the step of generating an input waveform comprises recording an impulse response from the reverberant cavity and modifying the impulse response to have uniform amplitude using one-bit time reversal, thereby generating the input waveform.

### Claim 6

An ultrashort high-power pulse generator comprising:
a reverberant cavity assembly having an input port and output port each opening onto a hollow cavity defined by sidewalls of the assembly; and
an arbitrary waveform generator configured to record an impulse response from the reverberant cavity and modify the impulse response to have uniform amplitude using one-bit time reversal, thereby generating an input waveform,
wherein the output port of the reverberant cavity assembly outputs the ultrashort high-power pulse.

### Claim 7 (depends on 6)

The ultrashort high-power pulse generator of claim 6, further comprising one or more signal amplifiers configured to amplify the input signal generated by the arbitrary waveform generator and feed the amplified signal into the input port of the reverberant cavity assembly.

### Claim 8 (depends on 6)

The ultrashort high-power pulse generator of claim 6, wherein the reverberant cavity assembly is a semi-2D cavity.

### Claim 8 (depends on 5)

The ultrashort high-power pulse generator of claim 5, wherein dimensions of the hollow cavity ensure an overmoded condition across a bandwidth of the input waveform.

### Claim 9 (depends on 6)

The ultrashort high-power pulse generator of claim 6, wherein the reverberant cavity is configured to cause waves reverberate only in a plane parallel to a breadth of the hollow cavity and perpendicular to a thickness of the hollow cavity.

### Claim 9 (depends on 5)

The ultrashort high-power pulse generator of claim 5, wherein the reverberant cavity assembly includes an X-shaped scatterer inside the hollow cavity configured as a modemixer.