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| Number | Title | Issue Date |
| 5872491 | Switchable N-way power divider/combiner An improved Wilkinson-type power divider/combiner possessing switching capabilities for selectively controlling operative modes of its constituent dividing/combining channels is disclosed. The switchable power divider/combiner includes N first switches co... | 02/16/1999 |
| 5828271 | Planar ferrite toroid microwave phase shifter A planar phase shifter having plural layers of ferrite forming a closed magnetic toroidal path and including internal layers of dielectric material of a relatively high dielectric constant and underlying layers of dielectric material having a relatively l... | 10/27/1998 |
| 5825261 | Passive, aperiodic phase shifting and attenuating device for electric signals A device provides, with passive circuits only, an output voltage in which ch spectral component is phase-shifted and attenuated by programmable values in relation to the spectral component of same frequency of an input signal. An adapter circuit (CA) appl... | 10/20/1998 |
| 5815050 | Differential delay line A thin film differential delay line configured in a strip line assembly on ceramic substrates for PECL logic applications. A number of alternative layered constructions are disclosed. Each assembly provides complementary serpentine conductors constructed ... | 09/29/1998 |
| 5808527 | Tunable microwave network using microelectromechanical switches A desired frequency response of a microwave network on a monolithic microwave integrated circuit (MMIC), a microwave integrated circuit (MIC), or a hybrid circuit is achieved by selectively switching MEM switches to change the network topology. In a filte... | 09/15/1998 |
| 5770987 | Coplanar waVeguide strip band pass filter A coplanar band pass filter having a centerline formed of at least first and second serially arranged conducting segments which are separated by a gap. The centered segments are flanked by a resonator for coupling return current from the first and second ... | 06/23/1998 |
| 5739734 | Evanescent mode band reject filters and related methods Apparatus and related methods for an easily manufactured evanescent mode band reject filter that provides high performance with minimal dependence on critical dimensions. According to one embodiment, the present invention provides a band reject filter inc... | 04/14/1998 |
| 5734307 | Distributed device for differential circuit An inductive element having a selectable inductive value is connectable to a differential circuit. The inductive element is formed of transmission lines, and the inductive value of the inductive element is altered by trimming away portions of the transmis... | 03/31/1998 |
| 5323128 | Dielectric filter having inter-resonator coupling including both magnetic and electric coupling A small and thin plane type narrow-band dielectric filter to be used for a portable telephone and the like, includes a plurality of end short-circuited strip line resonators having a length of about quarter-wavelength formed parallel and closely to each o... | 06/21/1994 |
| 5317293 | Waveguide switch circuit with improved switching and tuning capability An RF switch circuit includes a waveguide transmission line having an input port, an output port, a first wall having a first cavity disposed therein and a second wall having a second cavity disposed therein with the first and second cavities being aligne... | 05/31/1994 |
| 5317291 | Microstrip filter with reduced ground plane This microstrip comb line filter includes a planar dielectric substrate, and a planar ground member positioned on one side of the dielectric substrate and extending along a first portion of the substrate. There is a second portion of the substrate along w... | 05/31/1994 |
| 5293141 | Dielectric filter having external connection terminals on dielectric substrate and antenna duplexer using the same In a dielectric filter according to the present invention, a depressed part is formed by removing a portion of an outer peripheral conductor on the open face side of each of a plurality of one-end face short-circuited type coaxial resonators or a portion ... | 03/08/1994 |
| 5280452 | Power saving semsing circuits for dynamic random access memory A sensing circuit for a dynamic random access memory structure is disclosed having first and second bit lines, one of the bit lines being a reference bit line which is held at a precharge voltage when a sense amplifier in the sensing circuit is latched, t... | 01/18/1994 |
| 5278528 | Air insulated high frequency filter with resonating rods An inexpensive and lightweight air insulated high frequency filter can be made utilizing a radio device's frame and a printed board (15) intended for electrical circuits, so that during manufacture of the printed board (15) it is machined so that several ... | 01/11/1994 |
| 5278797 | Semiconductor memory device capable of executing non-periodic refreshing operations A semiconductor memory device, having cells respectively therein given information through rewriting, i.e., a refreshing operation, capable of performing non-periodic refreshing operations is disclosed. The semiconductor memory element internally includes... | 01/11/1994 |
| 5274347 | Coaxial fitting for microwave devices A coaxial fitting comprises, a metallic tubular ferrule having a forward portion with knurling thereon and a rearward portion with external threads thereon by which such fitting is coupleable to a coaxial cable, the fitting also comprising an inner metall... | 12/28/1993 |
| 5274346 | Integrated LC filter A case has parts storage openings through a top plane. Terminals protrude above the plane and extend downward through the case to a bottom plane, where they are bent to conform to the bottom plane. Interconnections of the terminals in the bottom plane pro... | 12/28/1993 |
| 5274598 | Semiconductor memory having improved sensing arrangement A semiconductor memory provided with improved sense amplifier-bit line arrangement which is suitable for a high-speed and high-sensitivity read operation. The memory comprises a main bit line pair, a main sense amplifier, a plurality of sub-bit line pairs... | 12/28/1993 |
| 5270671 | Negative slope phase skewer A negative slope phase skewer for use between radiating elements of series fed antenna array. The phase skewer has a four part coupler having two segments lying parallel to one another, each segment being a near and a far branch. The two near branches con... | 12/14/1993 |
| 5268659 | Coupling for dual-mode resonators and waveguide filter Dual-mode resonators are coupled together to form a highly selective bandpass filter by means of a short section of waveguide. The short sections have cutoff frequencies beyond the passband of the filter. The coupling is adjustable over a wide range by me... | 12/07/1993 |
| 5266911 | Multiplexing system for plural channels of electromagnetic signals A multiplexing system combines a plurality of electromagnetic signals to propagate along a common path, preferably a square waveguide which can be connected to an antenna feed horn of square cross section which can support both circularly and linearly pol... | 11/30/1993 |
| 5256990 | Compact, die-cast precision bandstop filter structure A precision, waveguide-configured, bandstop filter comprises a substrate formed of a conductive material capable of being die cast. To facilitate manufacture and assembly, the substrate is preferably formed as a pair of symmetrically shaped substrate halv... | 10/26/1993 |
| 5254963 | Microwave filter with a wide spurious-free band-stop response The present invention is directed to reducing the number of components required to minimize intermodulation distortion within the wide transmission frequency band used by a satellite communications repeater system. In particular, at least two TM010 | 10/19/1993 |
| 5253206 | Electrically erasable programmable read-only memory with threshold value measurement circuit A NAND cell type electrically erasable programmable read-only memory has NAND cell units. Each NAND cell unit has a series array of floating gate type metaloxide semiconductor field effect transistors as memory cell transistors. The first-stage memory cel... | 10/12/1993 |
| 5252934 | Microwave delay assembly A signal delay assembly for a high power linear amplifier, using feedforward circuitry to reduce distortion, comprises an interdigital delay line unit with included directional couplers. The structure of the interdigital delay line is substantially in a p... | 10/12/1993 |
| 5250915 | Laminate type LC filter A laminate type LC element includes a laminate defined by a plurality of stacked insulating layers. A first sheet-like conductor is formed between each pair of adjacent insulating layers to continuously wind and extend from between the pair of adjacent in... | 10/05/1993 |
| 5251172 | Semiconductor memory apparatus having reduced amount of bit line amplification delay In a DRAM formed of MOS FETs, respectively different values of substrate bias voltage are applied to transistors of different types of circuit in accordance with the circuit functions, to thereby enable the threshold voltage of the transistors of the sens... | 10/05/1993 |
| 5251179 | Apparatus and method for extending battery life An electrical product uses a small battery, which is permanently soldered into the product, to protect certain critical circuits such as volatile memory when primary power is removed. The life of such a battery is extended by disabling it during the time ... | 10/05/1993 |
| 5250916 | Multi-passband dielectric filter construction having filter portions with dissimilarly-sized resonators A filter duplexer, such as a filter duplexer for a radio transceiver, of minimum dimensions is disclosed. A first filter portion of the duplexer filter includes resonators of a first geometric configuration, and a second filter circuit portion of the dupl... | 10/05/1993 |
| 5248949 | Flat type dielectric filter A flat type dielectric filter comprises a substantially U-shaped strip line formed such that each center frequency of spurious output deviates from each odd number frequency times the center frequency of the dielectric filter. That is, it comprises a firs... | 09/28/1993 |
| 5247267 | Utilizing thermal conductors to increase operating power of coaxial microwave devices A coaxial microwave device, such as a microwave switching device, for example, having improved thermal and power handling characteristics. At least one thermally conductive short-circuit element is located between inner (input and output) and outer conduc... | 09/21/1993 |
| 5245581 | Semiconductor memory device with rapid sense amplification In each of the sense amplifiers of a DRAM, the common source terminal of pull-down transistors which are connected to a bit line pair is connected to a discharge line through first and second current paths. One end of the discharge line is grounded. The f... | 09/14/1993 |
| 5245300 | Intermediate frequency filter having a ceramic filter An intermediate frequency filter for an intermediate frequency used in the receiver section of a digital radio communications apparatus is composed of an amplitude-flat ceramic filter incorporating two ceramic resonators, a buffer means and a single tunin... | 09/14/1993 |
| 5243308 | Combined differential-mode and common-mode noise filter An electromagnetic noise filter has a plurality of U-shaped wires passing through a ferrite core. Some of the wires are singly fitted in throughholes, whereas other wires are commonly fitted in throughholes. The wires can be interconnected to provide for ... | 09/07/1993 |
| 5241291 | Transmission line filter having a varactor for tuning a transmission zero A transmission line structure (100) is provided which includes a resonator (110) having open ends (118) disposed on a substrate (130). The first resonator (110) includes a control voltage terminal (116) which is positioned at a point along the length wher... | 08/31/1993 |
| 5241505 | Read only memory device with high speed data output unit A read only memory device comprises a memory cell array, a selector unit interconnecting one of the memory cells to an input node of a sense amplifier unit for producing a read-out signal at a read-out node, a reference unit for producing a reference sign... | 08/31/1993 |
| 5239279 | Ceramic duplex filter Previously it was not possible to realize a ceramic duplex filter using a single monolithic ceramic block, because the isolation between the transmitter branch and the receiver branch could not be made sufficiently high. A duplex filter (1) can be realize... | 08/24/1993 |
| 5239280 | Dielectric filter having inductive input/output coupling A dielectric filter including a plurality of coaxial type dielectric resonators having outer conductors and inner conductors is arranged so that the outer conductors are connected to each other. Also included in the dielectric filter are central conductor... | 08/24/1993 |
| 5235296 | Directional coupler using a microstrip line In a directional coupler having four input/output terminals in a planar circuit using strip lines or microstrip lines, a quarter-wavelength line is connected between first and third terminals, and between second and fourth terminals, respectively, and fur... | 08/10/1993 |
| 5235298 | Temperature compensated stripline filter for microwaves The present invention is to overcome a problem of a variation in a resonant frequency of a microwave stripline filter which may occur at a change of temperature during when the microwave stripline filter is operated. The microwave stripline filter has res... | 08/10/1993 |
