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8125302 |
Signal selecting device
A signal selecting device according to the present invention has two input/output ports, a plurality of resonating parts, a plurality of impedance transforming parts, and a controlling part. The...
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8120449 |
Magnetically tunable filter with coplanar lines
The invention relates to a magnetically tunable filter having a filter housing and having two tunable resonator spheres which comprise magnetizable material and are arranged next to one another in...
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7884682 |
Waveguide to microstrip transducer having a ridge waveguide and an impedance matching box
When a microstrip line is connected with a waveguide, there is a limit to reducing the connection loss by using only a matching box. We have discovered that in a transmission mode line transducer...
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7535317 |
Coaxial characteristic-impedance transformer having concentric quarter wavelength lines configured as a power divider
A coaxial characteristic-impedance transformer for dividing RF power on a first terminal onto n second terminals situated in the same radial plane by multi-stage serial transformation via λ/4 ...
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7498897 |
Impedance matching circuit, and semiconductor element and radio communication device using the same
An impedance matching circuit, a semiconductor element and a radio communication device using the same, adjusting bandwidth while permitting it to be constructed on the semiconductor element by...
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7459855 |
Low-spurious-radiation microwave tube
The invention relates to a microwave tube comprising an electron gun generating an electron beam in a cylindrical microwave structure of the tube. The microwave structure delivers a microwave at...
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7446625 |
Narrow impedance conversion device
An impedance conversion device has four conductors arranged so that the first and second conductors form a transmission line having a first characteristic impedance, the third and fourth conductors...
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7420434 |
Circular to rectangular waveguide converter including a bend section and mode suppressor
A compact circular waveguide system can connect circular waveguides through a bend while avoiding excessive interaction between the orthogonal modes of the circular waveguides. A compact bend...
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7276989 |
Attenuator circuit comprising a plurality of quarter wave transformers and lump element resistors
A microwave attenuator circuit is disclosed, including a combination of a plurality of quarter wave transformers and a plurality of resistive elements.
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7205866 |
Electronic phase reflector with enhanced phase shift performance
A varactor based phase shifter that increases phase shift range using an impedance transformer to impart a low characteristic impedance between an input port and a reference node port. The...
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7183871 |
Bi-directional access point
An improved bi-directional access point includes an impedance boosting section in conjunction with an interface section to a bi-directional communication path. The impedance boosting section...
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7183873 |
Tapered thickness broadband matching transformer
An impedance matching transformer is disclosed. The transformer includes a conductive ground plane and a dielectric substrate disposed upon the conductive ground plane. The dielectric substrate has...
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7173502 |
Reflection loss suppression circuit
An object is to suppress a reflection loss in any desired frequency band outside a required band, without affecting circuit characteristics in the required frequency band. The output impedance of a...
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7170011 |
System and method for modifying electrical characteristics
System and methods for modifying an electrical parameter of an electrical component are described. The system includes an electrical component disposed on a circuit board and a dielectric material....
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7075385 |
Impedance converter device
An impedance converter device comprises an electrically conductive external conductor with one or more connection locations for electrical lines, an electrically conductive internal conductor with...
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6894583 |
Variable quarter-wave transformer
A continuously variable quarter-wave transformer (103) including a quarter-wave element (110). The quarter-wave transformer has a characteristic impedance and is at least partially coupled to a...
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6882242 |
Frequency selective low loss transmission line system
A frequency selective low loss transmission system for communicating a signal using a coaxial cable of one impedance to a device of different impedance. A connector with a matching transformer is...
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6876281 |
Variable transmission line transformer
A transmission line transformer (102) having an electrical length and a fluid dielectric (108). A fluid control system (150) is also provided for selectively moving the fluid dielectric (108) from...
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6864758 |
Apparatus and resonant circuit employing a varactor diode in parallel with a transmission line and method thereof
A resonant circuit includes a transmission line in parallel with a varactor diode. The varactor diode has a capacitance that is variable in response to an applied voltage, which allows for real...
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6856211 |
Coaxial type impedance matching device
A coaxial type impedance matching device includes a matching device body including an external conductor and an internal conductor arranged in the external conductor, an input side dielectric...
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6844792 |
Single ended tuning of a differential power amplifier output
A system and method for compensating a parasitic capacitance on a differential amplifier output includes a first differential output and a second differential output of the differential amplifier....
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6838954 |
High efficiency quarter-wave transformer
A circuit for processing radio frequency signals. The circuit includes a substrate where the circuit can be placed. The substrate can be a meta material and can incorporate at least one dielectric...
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6753745 |
High efficiency four port circuit
A circuit for processing radio frequency signals. The circuit includes a substrate where the circuit can be placed. The substrate can be a meta-material and can incorporate at least one dielectric...
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6737932 |
Broadband impedance transformers
The invention concerns an impedance transforming device that includes a dielectric circuit board substrate. The substrate has at least one region that has a relative permeability or a relative...
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6677830 |
Broadband matching network for an electroabsorption optical modulator
A broadband impedance matching circuit for use with an optical device such as an electroabsorption optical modulator comprises a microstrip transmission line, including pairs of like-sized open...
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6642819 |
Method and bend structure for reducing transmission line bend loss
A dielectric transmission line bend structure includes an electrically conductive strip that forms a bend (e.g., a right angle bend). The inner edge of the bend includes a plurality of curved...
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6621372 |
Impedance matching device
In an impedance matching device having at least two stubs serially provided to a main coaxial tube so as to be separated from each other with a predetermined interval in a tube axial direction,...
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6518853 |
Wideband compact large step circular waveguide transition apparatus
An apparatus for forming a quarter wave step between a waveguide of a radiating element under test and a waveguide associated with test equipment being used to test the radiating element. The...
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6414564 |
Distributed constant element using a magnetic thin film
The present invention is directed to a magnetic thin-film device whose operating frequency band ranges from several millihertz (MHz) to several gigahertz (GHz) and which is used as an inductor for...
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6337608 |
Formation of a transmission-line transformer providing a frequency-dependent impedance transformation ratio
A transformer for connection between a generator and a load may be formed by connecting n transmission lines together, in series at one end and in parallel at the other end. The transmission lines...
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6309245 |
RF amplifier assembly with reliable RF pallet ground
An RF pallet ground comprises overhangs disposed at opposite ends. Each overhang includes a downwardly protruding ledge and a notch defined in a bottom surface of the pallet. The ledges and notches...
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6239671 |
Transmission or delay line transformers
A transmission or delay line transformer comprising a plurality of transmission or delay lines (101-110) so arranged that the inputs to the lines are connected together in parallel to provide a...
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6223022 |
Mobile radio telephone with impedance matching network having two transformation factors
A mobile radio telephone includes a transmitter output stage and an antenna. An impedance matching network is inserted between the transmitter output stage and the antenna. The matching network has...
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5812040 |
Microwave vacuum window having wide bandwidth
A distributed microwave window (12) couples microwave power in the HE11 mode between a first large diameter waveguide (32) and a second large diameter waveguide (34), while providing a physical...
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5808521 |
Printed wiring board with the characteristic impedance of wiring pattern changed on the way thereof
A printed wiring board having a substrate, a plurality of load circuits formed on the substrate, a drive circuit formed on the substrate, for driving the load circuits, a first wiring pattern...
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5451916 |
Waveguide
A waveguide according to this invention has a waveguide portion used in transmission in a relatively low frequency band, and a stub circuit portion, connected in series with the waveguide portion,...
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5394119 |
Radio frequency connector for a patch coupled aperture array antenna
A radio frequency connector for a patch-coupled aperture array antenna is described including a coaxial connector having an outer shield and an inner conductive member with a dielectric material...
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5262743 |
Microwave process seal
A microwave process seal and method is provided for use, for example, in the detection of ullage level and flow in a vessel or conduit by detecting the presence of a solid or liquid material in...
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5262740 |
Microstrip transformer apparatus
A transmission line structure operates as a transformer and includes at least two intertwined serpentine planar transmission lines positioned on a substrate with the lines repeatedly crossing each...
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5258727 |
Microribbon/waveguide transition for plate type antenna
The present invention relates to a microribbon/wave guide line transition, especially between an antenna (1) of the plate antenna type, with radiating elements (3) and feed lines (4) printed on a...
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5173666 |
Microstrip-to-inverted-microstrip transition
A microstrip-to-inverted-microstrip transition for providing a low-loss cection of a microstrip to an inverted microstrip in planar microwave devices. One embodiment includes tapered dielectric and...
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5115218 |
Microwave process seal and method
A microwave process seal and method is provided for use, for example, in the detection of ullage level and flow in a vessel or conduit by detecting the presence of a solid or liquid material in...
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5093639 |
Electromagnetic stripline coupler apparatus
An electromagnetic stripline coupler apparatus having a pair of coupler units which are separated by a conductive ground plane with a slot in it that is aligned to pass signal energy between the...
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5065119 |
Narrow-band, bandstop filter
A multi-resonant notch filter incorporates a stepped impedance transmission line with impedance values going from a relatively low value and increasing upward to a relatively high value then back...
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5041803 |
Automatic load matching circuit for microwaves using multi-element matching device
An automatic load-matching circuit for microwaves, disposed on a transmission line between a signal source and a load. Signal detection means for detecting a travelling wave component and a...
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4952892 |
Wave guide impedance matching method and apparatus
A technique for modifying the end portion of a wave guide, whether hollow or solid, carrying electromagnetic, acoustic or optical energy, to produce a gradual impedance change over the length of...
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4893508 |
Humidity sensing apparatus and method therefor
A sensing system and method suitable for use in humidity sensing instruments such as radiosondes to determine the true relative humidity of the atmosphere contemporaneously with other parameters at...
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4891614 |
Matching asymmetrical discontinuties in transmission lines
The invention relates to matching asymmetrical discontinuites in transmission lines to give low reflection coefficients (less than five percent) over a wide frequency band (corresponding to at...
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4789809 |
High frequency discharge apparatus with impedance matching
In a high-frequency discharge apparatus utilizing a discharge tube positioned between an electrode and a ground plane, the electrode is shaped so as to increase the uniformity of the electric field...
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4788473 |
Plasma generating device with stepped waveguide transition
A plasma generating device comprises:a rectangular wave guide for transmitting microwaves, wherein the width of the plasma generating device is decreased in the direction of an electrical field of...
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