US Pat. No. 9,239,277

MATERIAL MECHANICAL CHARACTERIZATION METHOD FOR MULTIPLE STRAINS AND STRAIN RATES

UT-BATTELLE, LLC, Oak Ri...

1. A man-made specimen for measuring behavior of a material under multiple strain rates with only a single strain test comprising:
a man-made body having a first end, a second end and a gage region disposed between the first end and the second end, wherein
the body has a central, longitudinal axis passing through the first end and the second end, wherein the man-made body consists
essentially of the same material throughout; and

wherein the gage region comprises:
a first gage section, having a first length along the central, longitudinal axis, and a second gage section, having a second
length along the central, longitudinal axis, wherein the first gage section defines a first constant cross-sectional area
along the first length that is defined by a first plane that extends through the first gage section and is perpendicular to
the central, longitudinal axis and the second gage section defines a second constant cross-sectional area along the second
length that is defined by a second plane that extends through the second gage section and is perpendicular to the central,
longitudinal axis, wherein the first gage section and the second gage section are connected to one another by a step portion
that has a non-linear profile as viewed along a direction perpendicular to the central, longitudinal axis; and

a third gage section, having a third length along the central, longitudinal axis, wherein the third gage section defines a
third constant cross-sectional area along the third length that is defined by a third plane that extends through the third
gage section and is perpendicular to the central, longitudinal axis, wherein the first cross-sectional area, the second cross-sectional
area and the third cross-sectional area are each unequal in size with one another.

US Pat. No. 9,054,416

INVERTED CONICAL SINUOUS ANTENNA ABOVE A GROUND PLANE

Associated Universities, ...

1. A wideband antenna, comprising:
an inverted cone;
four sinuous arms coupled to the inverted cone; and
a ground plane behind an apex of the inverted cone, wherein each pair of opposing sinuous arms comprising a pair of active
resonators having an image, wherein each pair of active resonators and each pair of active resonators' image produce a beam
directed orthogonal to the ground plane toward a base of the inverted cone, and wherein a distance between midpoints of corresponding
resonators, measured in a plane parallel to the ground plane and passing through the midpoints of the corresponding resonators,
in opposing arms is between 0.4? and 0.8?, wherein ? is a wavelength of the resonate frequency of the resonators.

US Pat. No. 9,343,815

RANDOMIZED SURFACE REFLECTOR

Associated Universities, ...

1. A method of calibrating a radiometer, comprising:
determining the attributes of a feed horn of the radiometer;
constructing a randomized surface reflector based on the attributes of the feed horn,
wherein the randomized surface reflector is comprised of a plurality of cells arranged on a plate, each cell having a randomly
determined height above a baseline;

obtaining an actual temperature of the feed horn;
placing the randomized surface reflector adjacent to the feed horn so that the randomized surface reflector reflects the electromagnetic
signals of the feed horn;

measuring the radiometric temperature of the feed horn based on a signal reflected from the calibration surface;
replacing the randomized surface reflector with an object of known temperature;
measuring the temperature of the object of known temperature based on the signal emitted from the object; and
calculating a calibration coefficient for the radiometer based on the actual temperature of the feed horn, the measured temperature
of the feed horn, the actual temperature of the object, and the measured temperature of the object.

US Pat. No. 9,983,298

FIBER OPTIC BASED LASER RANGE FINDER

Associated Universities, ...

1. A laser rangefinder comprising:a first DDS (direct digital synthesizer) outputting a first reference signal;
a first pin diode detector coupled to an isolated laser source;
a first demodulated laser source input to a first double balanced mixer;
an isolated laser source that receives the first reference signal and outputs an optical signal;
a collimating lens coupled to the isolated laser source adapted to direct the optical signal to free space;
a collecting lens positioned adjacent to the collimating lens adapted to receive a modulated optical signal from free space;
a second pin diode detector coupled to collecting lens;
a second demodulated optical signal input to a second double balanced mixer;
a second DDS outputting a second reference signal;
the second reference signal input to each double balanced mixer; and
a computing device adapted to receive the first reference signal, the second reference signal, and
the received modulated optical signal and calculate a distance by sampling a difference frequency to determine the phase.

US Pat. No. 9,306,497

SYNTHESIZER METHOD UTILIZING VARIABLE FREQUENCY COMB LINES AND FREQUENCY TOGGLING

Associated Universities, ...

1. A variable frequency synthesizer, comprising:
a reference frequency;
a direct digital synthesizer (DDS) receiving the reference frequency and outputting a tuned frequency;
a variable frequency comb generator receiving the tuned frequency and outputting a variable frequency comb comprised of a
plurality of comb lines; and

a tunable filter adapted to tune the variable frequency synthesizer to a specific comb line from the plurality of comb lines;
wherein the variable frequency synthesizer outputs a range of synthesized frequencies based on the specific comb line the
variable frequency synthesizer is tuned to.

US Pat. No. 9,923,540

TRANSMISSION LINE REFLECTIONLESS FILTERS

Associated Universities, ...

1. A reflectionless electronic filter comprising:
a symmetric two-port circuit, wherein the symmetry defines an even-mode equivalent circuit and an odd-mode equivalent circuit
when the ports are driven in-phase and 180° out-of-phase, respectively;

at least one transmission line;
at least one lossy element or matched internal sub-network arranged within the symmetric two-port circuit such that:
a normalized input impedance of the even-mode equivalent circuit is substantially equal to a normalized input admittance of
the odd-mode equivalent circuit; and

a normalized input impedance of the odd-mode equivalent circuit is substantially equal to a normalized input admittance of
the even-mode equivalent circuit;

a coupled transmission line section connected to a first port, and a coupled transmission line section connected to a second
port;

wherein an even- or odd-mode equivalent circuit comprises a transmission line in cascade with a reflective filter;
wherein each lossy element or matched internal sub-network provides a matched termination to the stop-band signal path of
the reflectionless electronic filter;

wherein the thru-node of each of the coupled line sections is connected to identical chains of cascaded transmission lines
and transmission line stubs;

wherein the chains of cascaded transmission lines and the transmission line stubs are terminated by two termination resistors
connected to each other, or with a matched internal sub-network having a node common to both sides;

wherein the node joining the two termination resistors or the common node of the matched internal sub-network further attaches
at least one parallel-connected stub; and

wherein the cascade transmission lines, the transmission line stubs, and the coupled transmission lines are all essentially
a quarter wavelength long at some the center frequency of operation.

US Pat. No. 10,433,468

HIGHLY RFI SHIELDED MODULAR ELECTRONICS PACKAGING SYSTEM

Associated Universities, ...

1. A Radio Frequency Interference (RFI) shielded electronics enclosure, comprising:at least one hollowed-out body having an inner lip and an outer lip, wherein the inner lip extends further than the outer lip;
at least one hollowed-out cover, wherein the at least one hollowed-out cover is adapted to cover the inner lip and abut the outer lip of the at least one hollowed-out body to prevent RFI leakage;
a plurality of fastening devices adapted to secure the at least one hollowed-out cover to the at least one hollowed-out body; and
a plurality of gaskets positioned between the at least one hollowed-out cover and the at least one hollowed-out body, wherein a first gasket of the plurality of gaskets is positioned adjacent to the inner lip and a second gasket of the plurality of gaskets is positioned adjacent to the outer lip of each of the at least one hollowed-out body.

US Pat. No. 10,128,576

RANDOMIZED SURFACE REFLECTOR

Associated Universities, ...

1. A randomized surface reflector, comprising:a plate;
a plurality of electromagnetic wave reflective cells arranged on the plate, each cell having a randomly determined height above a baseline, wherein each cell is a geometric shape and the cells are arranged in a grid and each cell has sides that are greater than one wavelength at a lowest frequency of a frequency band of interest.

US Pat. No. 10,230,348

SUB-NETWORK ENHANCED REFLECTIONLESS FILTER TOPOLOGY

Associated Universities, ...

1. A reflectionless, impedance-matched, electronic filter comprising: a nested structure of smaller impedance-matched sub-networks, comprising at least one essentially lossless element and at least one lossy element;wherein one or more sub-networks provide impedance-matched terminations to the reflectionless filter they are nested within;
wherein at least one sub-network comprises a symmetric, two-port circuit,
wherein the sub-network symmetry defines an even-mode equivalent circuit, and an odd-mode equivalent circuit when the ports are driven in-phase and 180-degrees out-of-phase, respectively;
wherein a normalized input impedance of the symmetric sub-network's even-mode equivalent circuit is substantially equal to the normalized input admittance of that sub-network's odd-mode equivalent circuit;
wherein a normalized input admittance of the symmetric sub-network's even-mode equivalent circuit is substantially equal to the normalized input impedance of that sub-network's odd-mode equivalent circuit;
wherein at least one impedance-matched sub-network has frequency-dependent amplitude and phase response; and
wherein at least one impedance-matched sub-network has at least one internal node in addition to the port nodes and the nodes in series with the ports or ground nodes of the sub-network.

US Pat. No. 10,199,735

TEM LINE TO DOUBLE-RIDGED WAVEGUIDE LAUNCHER

Associated Universities, ...

1. A Transverse Electric and Magnetic (TEM) transmission line (TEM line) or quasi-TEM line to double-ridged waveguide launcher, comprising:one or more probes extending across the gap in a double-ridged waveguide;
a waveguide backshort; and
a TEM combiner or matching taper;
wherein one or more of the ridges of the double-ridged waveguide do not extend into the backshort;
wherein the backshort provides a near open-circuit to the probes over a wide range of frequencies;
wherein each probe is adapted to minimize spreading inductance of currents in the launcher across a width of the ridges of the double-ridged waveguide; and
wherein the TEM combiner matches the collective impedance of the probes to the TEM line.

US Pat. No. 10,374,577

OPTIMAL RESPONSE REFLECTIONLESS FILTERS

Associated Universities, ...

1. A symmetric reflectionless filter comprising:a symmetric two-port circuit, wherein the symmetry defines an even-mode equivalent circuit and an odd-mode equivalent circuit when the ports are driven in-phase and 180° out-of-phase, respectively;
wherein the even-mode equivalent circuit is a terminated ladder-topology of filter elements with fully-independent element values;
wherein at least one of the filter elements is synthesized from active circuits; and
the odd-mode equivalent circuit is the dual topology of the even-mode equivalent circuit, such that:
a normalized input impedance of the even-mode equivalent circuit is substantially equal to a normalized input admittance of the odd-mode equivalent circuit; and
a normalized input impedance of the odd-mode equivalent circuit is substantially equal to a normalized input admittance of the even-mode equivalent circuit.

US Pat. No. 10,277,240

POLAR ANALOG-TO-DIGITAL CONVERTER AND DOWN CONVERTER FOR BANDPASS SIGNALS

Associated Universities, ...

1. A method of determining an amplitude and phase of a bandpass signal, comprising the steps of:generating real and imaginary parts of an analytic representation of said bandpass signal through a quadrature hybrid, wherein the real and imaginary parts of an analytic representation of said bandpass signal is an analytic signal;
determining an amplitude of the analytic signal by adding an even power-law transform of the real and imaginary parts of the analytic signal; and
determining a phase of the analytic signal by comparing the real and imaginary parts of the analytic signal to zero and comparing the even power-law transform of an absolute value of the real and imaginary parts of the analytic signal to each other.

US Pat. No. 10,277,189

TRANSMISSION LINE REFLECTIONLESS FILTERS

Associated Universities, ...

1. A reflectionless, impedance-matched, electronic filter comprising:a symmetric two-port network, wherein the symmetry defines an even-mode equivalent circuit and an odd-mode equivalent circuit when the ports are driven in-phase and 180-degrees out-of-phase, respectively, such that:
a normalized input impedance of the even-mode equivalent circuit is substantially equal to the normalized input admittance of the odd-mode equivalent circuit; and
a normalized input admittance of the even-mode equivalent circuit is substantially equal to the normalized input impedance of the odd-mode equivalent circuit;
wherein the two ports are known as the input and output, respectively,
wherein the ports are connected through a pair of coupled-line sections, one on the input-port side, the other on the output-port side,
wherein the coupled transmission-line sections connected to the ports are also connected to identical chains of cascaded transmission-line sections, transmission-line stubs, and additional coupled transmission lines, with one chain on the input side and one chain on the output side;
wherein the chains on each side are terminated by resistors or one or more impedance-matched internal subnetworks;
wherein the resistors or matched internal subnetworks may be grounded through transmission-line stubs.

US Pat. No. 10,263,592

OPTIMAL RESPONSE REFLECTIONLESS FILTERS

Associated Universities, ...

1. A reflectionless electronic filter comprising:a symmetric two-port circuit, wherein the symmetry defines an even-mode equivalent circuit and an odd-mode equivalent circuit when the two ports are driven in-phase and 180° out-of-phase, respectively;
at least one lossless element and at least one impedance-unmatched internal sub-network topology,
wherein an impedance-mismatch of the at least one impedance-unmatched internal sub-network topology interacts with the symmetric two-port circuit, such that:
a normalized input impedance of the even-mode equivalent circuit is substantially equal to a normalized input admittance of the odd-mode equivalent circuit; and
a normalized input impedance of the odd-mode equivalent circuit is substantially equal to a normalized input admittance of the even-mode equivalent circuit.