摘要:
High efficiency transmitters for electronically scanned arrays (also known as electronically steered antennas or ESAs) are disclosed. The transmitters in accordance with the present disclosure utilize outphasing power amplification. In one embodiment, the outphasing transmitter includes a phase shifting device. The phase shifting device is configured for phase shifting an input signal and providing a pair of phase shifted signals for each emitting element of the EAS. The outphasing transmitter also includes an outphasing power amplifier associated with each emitting element. Each outphasing power amplifier is configured for separately amplifying the pair of shifted signals for each emitting element and combining the separately amplified signals for each emitting element for transmission.
摘要:
An exemplary method for making a micropump device is disclosed as providing inter alia a substrate (300), an inlet opening (310), and outlet opening (340), a pump chamber (370) and flapper valves (350, 360). The fluid inlet channel (310) is generally configured to flow a fluid through/around the inlet opening flapper valve (350). The outlet opening flapper valve (360) generally provides means for preventing or otherwise decreasing the incidence of outlet fluid re-entering either the pumping cavity (370) and/or the fluid inlet channel (310). Accordingly, the reduction of backflow generally tends to enhance overall pumping efficiency. Disclosed features and specifications may be variously controlled, adapted or otherwise optionally modified to improve micropump operation in any microfluidic application. Exemplary embodiments of the present invention representatively provide for substantially self-priming gas/liquid micropumps that may be readily integrated with existing portable ceramic technologies for the improvement of device package form factors, weights and other manufacturing and/or device performance metrics.
摘要:
A field emission cathode for use in flat panel displays is described including a layer of conductive material and a layer of amorphic diamond film, functioning as a low effective work-function material, deposited over the conductive material to form emission sites. The emission sites each contain at least two sub-regions having differing electron affinities. Use of the cathode to form a computer screen is also described along with the use of the cathode to form a fluorescent light source.
摘要:
A field emission display (100) includes an electron emitter structure (105) designed to emit an emission current (134), a phosphor (126) disposed to receive at an electron-receiving surface (127) emission current (134), and a multi-layered barrier structure (125) disposed on electron-receiving surface (127) of phosphor (126). Multi-layered barrier structure (125) of the preferred embodiment includes an aluminum layer (128) disposed on electron-receiving surface (127) of phosphor (126) and a carbon layer (129) disposed on aluminum layer (128).
摘要:
A field emission device (100) includes a supporting substrate (110) having a major surface; a cathode (111) disposed on the major surface of the supporting substrate (110); a dielectric layer (112) disposed on the cathode (111); a gate extraction electrode (114) disposed on the dielectric layer (112); the cathode (111), the dielectric layer (112), and the gate extraction electrode (114) defining a spacer well (132); an anode plate (104) opposing the gate extraction electrode (114); a spacer (106) extending between the cathode (111) at the spacer well (132) and the anode plate (104); a first spacer shield (108) disposed within the spacer well (132) and surrounding the spacer (106); and a second spacer shield (108) affixed to the anode plate (104) and surrounding the spacer (106).
摘要:
A method is provided for fabricating a display cathode which includes forming a conductive line adjacent a face of a substrate. A region of amorphic diamond is formed adjacent a selected portion of the conductive line.
摘要:
A field emission cathode is provided which includes a substrate and a conductive layer disposed adjacent the substrate. An electrically resistive pillar is disposed adjacent the conductive layer, the resistive pillar having a substantially flat surface spaced from and substantially parallel to the substrate. A layer of diamond is disposed adjacent the flat surface of the resistive pillar.
摘要:
Ionized metal cluster beam deposition of metal bumps on substrates such as multi-chip modules and integrated circuit chips is enhanced. The present invention discloses wet etching techniques for removing unwanted metal deposited on the substrate around bumps, and multiple sources for depositing alloyed (tin-lead) bumps with constant composition.
摘要:
A device may include a first antenna and a second antenna. The device may further include a frequency domain multiplexer configured for receiving a first input signal. The frequency domain multiplexer may have a first output port connected to the first antenna and configured for supplying a signal in a low band frequency range of the first input signal to the first antenna, and a second output port connected to the second antenna and configured for supplying a signal in a high band frequency range of the first input signal to the second antenna. The device may also include a third antenna configured for receiving a signal in a mid band frequency range of a second input signal. The low band frequency range may be separated from the high band frequency range.
摘要:
A system and method for controlling or otherwise effectively parameterizing the delivery of fuel to a fuel cell device comprises a fuel pump (330), a mixing chamber (310), a fuel concentration sensor (350), a control device (360), a pump driver (370) and a pulse generator (380). Various features and parameters of the present invention may be suitably adapted to optimize the fuel transport function for any particular fuel cell design. The present invention provides inter alia improved control of delivery of methanol to a DMFC fuel solution.