Abstract: A noise induced from a switching power supply source or the like is applied to a power line. The noise is classified into two kinds, one of them being normal mode noise appearing between power lines and the other one being common mode noise appearing between a power line and a ground line. Thus, a line filter is required to attenuate these noises.

Abstract: A dielectric block filter assembly which is surface-mounted upon a circuit board. The circuit board includes an opening formed to extend therethrough, and parallel-extending projecting members, formed of a portion of the printed circuit board, which extend into the opening formed to extend through the circuit board. The dielectric block filter includes a bottom mounting surface having notches corresponding to the projecting members. Each notch includes a seating surface for seating against corresponding ones of the projecting members in mated engagement therewith.

Abstract: A high-frequency coaxial resonator including a tubular dielectric member having a through hole and provided with inner and outer peripheral surfaces and a pair of end surfaces which axially oppose each other. An inner conductor is formed on the inner peripheral surface and an outer conductor is formed on the outer peripheral surface, the outer conductor extending onto one or both end surfaces of the tubular dielectric member so as to approach the inner conductor through a prescribed clearance, thereby forming a capacitance between the inner and outer conductors for adjusting the resonant frequency of the resonator.

Abstract: A high percentage bandwith microwave filter network, according to an embodiment of the present invention, comprises a T-network of capacitors implemented with thin-film techniques by applying a groundplane to one side of an alumina substrate and a first plate to the other side. A silicon nitride dielectric layer having a high density of capacitance is deposited over the first plate, and then a second and third capacitor plate are deposited on the dielectric over the first plate.

Abstract: A method of designing a .pi. type LC filter includes laminating dielectric layers on top and bottom sections of a magnetic material layer, forming a first external electrode and a second external electrode on each end of the laminated body, forming a third external electrode at a center section of the laminated body, forming an inductor by at least one conductor line within the magnetic material layer, connecting one end of the conductor line to the first external electrode and the other end thereof to the second external electrode, and forming a first capacitor composed of a parallel capacitor electrode within the top dielectric layer. One of the parallel capacitor electrodes is connected to the first external electrode and the other is connected to the third external electrode. Additionally, a second capacitor is formed composed of a pair of parallel capacitor electrodes within the bottom dielectric layer.

Abstract: In those monolithic ceramic filters that require resonator stages formed within a block of dielectric material to be electrically coupled together through discrete components, namely wires (44 and 46), a substantial space savings as well as improved electrical and mechanical performance can be realized by mounting the wires (44 and 46) within de-coupling cavities (36 and 40) when such de-coupling cavities are available and properly positioned with respect to the other resonator elements in the filter.

Abstract: A magnetron includes a cathode assembly which comprises a helically wound wire supported by a ceramic cylindrical member. Emissive material is located between adjacent turns of the conductor and connection is provided to the conductor via a rod and tube. When current is passed through the conductor (2), the emissive material (4) is directly heated.

Abstract: A coaxial resonator with a distributed tuning capacity. The resonator includes one outer conductor and one central conductor, both conductors having a symmetry of revolution around a predetermined central axis. The tuning capacitor is fully distributed along the axis of the resonator and includes at least two cylindrical armatures nested into each other and having the axis of the resonator as their central axis, one of the two armatures constituting one of the two conductors of the resonator. The coaxial resonator may find particular application for RMN magnetometer probes.

Abstract: Planar dual mode filters (30) are formed by a conductive resonator (20) having circular symmetry and two pairs of symmetrically oriented planar conductive leads (22, 26 and 24, 28). The conductive leads (22, 26 and 24, 28) are aligned colinearly with two orthogonal diameters (32, 34, respectively) of the circular conductive resonator (20) and are electrically isolated from said resonator (20). A perturbation (38) located on an axis (36) oriented symmetrically with respect to the two pairs of conductive lead (22, 26 and 24, 28) couples electromagnetic modes which are injected into the resonator (20) by the planar conductive leads (22, 26 and 24, 28). Higher order filter circuits can be realized by combining multiple filters (30) of the present invention. The filters (30) are amenable to printed circuit (microstrip to stripline) fabrication using superconductors for the conductive elements.

Abstract: A broadband phase shifter and vector modulator includes two artificial transmission lines interconnected by FETs to selectively produce and sum incremental phase shifts of an input signal. A number of low pass filter sections are connected in series to form the first of the two artificial transmission lines and a number of high pass filter sections are connected in series to form the second artificial transmission line. Use of low pass and high pass filters equalizes transit times of each phasor through the phase shifter so as to maintain the proper phase relationship between the phasors over a broad bandwidth. Each of the two artificial transmission lines are coupled to a transistor circuit connecting corresponding low and high pass filter sections. The phase shifter operates by selectively summing the output variable-amplitude phase-shifted signals generated within the transmission lines to produce an output signal having a phase shift between 0.degree. and 360.degree..

Abstract: This invention offers a compact and high performance dielectric filter consisting of a quarter wavelength dielectric body provided with a through-hole between the upper and lower surfaces of the dielectric body, electrodes deposited on external and lower surfaces of the dielectric body, and at least two independent electrodes provided on an internal surface of the through-hole, extending to the upper and lower surfaces of the dielectric body. With this dielectric filter construction, the through-hole performs the role of constructing plural quarter wavelength resonators and performs, at the same time, the role of adjusting the coupling between the plural resonators, thus yielding a compact dielectric filter of simple construction.

Abstract: Structure for use in forming a resonant circuit eliminates a support block for the installation of a dielectric resonator, by providing a satisfactory way to directly install the dielectric resonator on a microwave circuit board having a microstrip line. The dielectric resonator is directly fixed on the microwave circuit board in such a manner that mutually opposing planar surfaces thereof do not face one planar surface of the microwave circuit board, and an axial line passing normally through these planar surfaces intersects a normal plane projected from the microstrip line. As a result, production costs can be reduced and simplified work processes can be used to fabricate the structure. Further, an electrode film may be formed on a flat part of the outer periphery of the dielectric resonator, and such a dielectric resonator is fixed on the microwave circuit board with the flat part on which said electrode film is formed, facing upwards.

Abstract: A multipole bandpass filter (40) comprises a first microstrip split-ring resonator (12), having at least a first edge and a second edge, the first edge having a gap (20) therein, and an input. The bandpass filter (40) also comprises a second microstrip split-ring resonator (14), having at least a first edge and a second edge, the second edge of the second microstrip split-ring resonator comprising a gap (26) therein and a balanced output (30, 32). The bandpass filter also includes at least one straight line quasi-combline resonator (22), disposed between the first microstrip split-ring resonator, and the second microstrip split-ring resonator.

Abstract: Improved frequency characteristics can be achieved by using input/output pads on a surface mount block filter which pads are mounted on mesas formed by troughs cut through the dielectric material and metallization.

Abstract: This invention relates to a compact and high performance microwave stripline resonator consisting of a dielectric substrate provided with a strip electrode and a depression coated with an electrode which is connected to an end of the strip electrode provided on one of the surfaces of the dielectric substrate and a grounding electrode provided on the other surface of the dielectric substrate, and the grounding electrode is connected to the other end of said strip electrode. With this dielectric resonator construction, the characteristic impedance of the strip electrode and the characteristic impedance of the electrode coated on the depression are made different. As a result of this, the length of microwave stripline can be shortened without sacrificing the Q of the resonator. This is highly effective to realize compact resonators.

Abstract: Improved Q factor for stripline and microstrip filters can be realized by increasing the thickness of conductive paths. Increased conductive paths in a stripline and microstrip filter can be realized by forming slots (20) in a block of dielectric material (12) which permit an increased thickness of transmission path thereby improving the Q factor of the material by reducing at least resistive losses.

Abstract: A transmission line structure comprises a dielectric substrate (11) having first and second opposing sides separated by a first distance (3). A transmission line (13) is disposed on the first side while an opposed conductor (12) is disposed on the second side. The transmission line (13) has a first edge (4) a second edge (6), and a midde portion (8). Thicknesswise, the middle portion (8) is separated from the opposed conductor by the first distance (3), and at least a portion of the first edge (4) is separated from the opposed conductor by a second distance less than the first distance (3).

Abstract: The stop-band and pass-band frequencies of a duplex filter which includes a plurality of helix resonators must not change when the temperature changes. Therefore the resonators used must be temperature compensated. One known method is to injection-mold plastic bonds (3, 8) to the cover (2) of the resonator shield in such a way that the last turns of the helical coil (4) of the resonator are inside the bond (3, 8). Through a suitable selection of the bonding material it is possible in part to compensate for changes in the distance between the open end of the resonator coil and the cover of the shield and for changes in the pitch of the turns of the conductor (4) wound into a helical coil and in the coil length. In practice this compensation is undercompensated in character. According to the invention it is possible, by making one interval (pitch) (7) between the free turns of the coil greater than the others, to make the temperature compensation just right.

Abstract: A noise filter of a monolithic type in which a common electrode is formed in a sintered body having varistor characteristics so as to extend from a first portion to a second portion of side surfaces of the sintered body, and at least one through electrode is formed in a position at a height spaced apart from the common electrode through a sintered body layer in the direction of thickness so as to extend from a third portion to a fourth portion of the side surfaces of the sintered body and to intersect the common electrode.

Abstract: A heterostructure acoustic charge transport (HACT) device having a number of signal tap electrodes has revealed unexpected insensitivity to electrode spacing and unexpected sensitivity to electrode width. Spacing of one SAW wavelength between consecutive electrodes and an electrode width of .lambda./20 are preferred.