Abstract: A material including a conductor may be rolled to form a resonant element.

Abstract: A duplex filter includes a core of dielectric material with top, bottom, and side surfaces, and first and second spaced-apart sets of through-holes extending therethrough. A wall extends outwardly from the top surface to define a peripheral rim and cavity. A pattern of metallized and unmetallized areas are defined on selected core surfaces including strips of metallization on the top surface that extend onto the wall and the peripheral rim thereof to define respective transmit, receive, and antenna connection posts. In one embodiment, the core is made from two separate blocks which have been coupled together to define an interior metallized layer which separates the first and second sets of through-holes and an exterior wall on the top surface separates the respective transmit and receive conductive patterns thereon.

Abstract: Various exemplary embodiments relate to a temperature compensation structure for use in a dielectric resonator that permits a support to be thermally efficient in rapidly transferring heat generated by a central puck in the resonator. The temperature compensation structure may have an extension shaped to promote heat from the puck into the support, thereby permitting high power operation of the dielectric resonator without overheating.

Abstract: An RF filter, e.g. RF cavity filter for adjusting coupling amount or transmission zero is disclosed. The RF filter includes a housing member in which cavities are defined by walls, resonators located in the cavities, a cover combined with an upper surface of the housing member, a first tuning element inserted into a first cavity of the cavities through the cover, and a second tuning element inserted into a second cavity of the cavities through the cover. Here, the first tuning element and the second tuning element are connected electrically.

Abstract: Method for transmitting a high-frequency signal by a coupling effect includes receiving a high-frequency signal by a high-frequency circuit and coupling the high-frequency signal to a coupling circuit by the coupling effect to output a high-frequency coupled signal, and adjusting a filter between the coupling circuit and the high-frequency circuit formed by the coupling effect for adjusting transmission frequency of the high-frequency coupled signal; upon when the high-frequency circuit includes a high-frequency metal probe, the coupling circuit comprises a coupling transmission wire. Meanwhile, upon when the high-frequency circuit includes the coupling transmission wire, the coupling circuit includes the high-frequency metal probe.

Abstract: Embodiments provide a novel fabrication method and structure for reducing structural weight in radio frequency cavity filters and novel filter structure. The novel filter structure is fabricated by electroplating the required structure over a mold. The electrodeposited composite layer may be formed by several layers of metal or metal alloys with compensating thermal expansion coefficients. The first or the top layer is a high conductivity material or compound such as silver having a thickness of several times the skin-depth at the intended frequency of operation. The top layer provides the vital low loss performance and high Q-factor required for such filter structures while the subsequent compound layers provide the mechanical strength.

Abstract: A communication module includes a filter element, a package substrate on which the filter element is mounted, and a module substrate on which the package substrate is mounted. Each of the package substrate and the module substrate is formed of a laminate of a plurality of metal layers and a plurality of insulation layers. An outermost insulation layer forming a mounting surface of the package substrate that is a surface on which the filter element is mounted has a thickness smaller than a thickness of at least one of the other insulation layers included in the package substrate. An outer insulation layer forming a mounting surface of the module substrate that is a surface on which the package substrate is mounted has a thickness smaller than a thickness of at least one of the other insulation layers included in the module substrate.

Abstract: An RF filter assembly comprising a monoblock of dielectric material defining a first RF filter and a lid of dielectric material defining a second RF filter. In one embodiment, the monoblock defines a peripheral wall of dielectric material extending upwardly from a top surface thereof and first and second posts of dielectric material also extending upwardly from the top surface of the monoblock including regions of metallization thereon defining respective conductive input/output pads. The lid is seated against the top of the wall of the monoblock in a relationship spaced from the top surface of the monoblock and defines at least one region of metallization on one of the surfaces thereof defining a filter and a conductive input/output pad in coupling relationship with the input/output pad defined on one of the first and second posts on the monoblock.

Abstract: A filter includes: a container; at least one barrier, an input device and an output device. The at least one barrier divide the space of the container into at least two resonant cavities. Each resonant cavity has a harmonic oscillator disposed therein. The harmonic oscillators includes a supporter and a carbon nanotube structure disposed on a surface of the supporter.

Abstract: This disclosure describes an implantable medical lead, and method of making such a lead or components of the lead, that reduces the undesirable effects the fields generated by an MRI device may have on the implantable medical lead and the implantable medical device. The implantable medical lead includes an RF filter placed in series with an electrical path to an electrode of the lead. In one example, the RF filter may comprise a conductor wound in such a manner that it provides an inductance and capacitance that provides the RF filter with a resonant frequency, and in some instances, multiple resonant frequencies. At frequencies around the resonant frequency of the RF filter, the RF filter presents a high impedance, thereby blocking the signal from or at least attenuating the signal propagating to the electrode. At frequencies far from the resonant frequency, the RF filter presents a low impedance.

Abstract: A band-elimination filter (BEF) that includes a coaxial dielectric resonator block, a substrate, and first, second, and third inductance elements. The coaxial dielectric resonator block includes inner conductors and an outer conductor, and forms coaxial dielectric resonators. The first inductance element is between a signal transmission path connected to one of the coaxial dielectric resonators via a series resonant capacitor and a signal transmission path connected to the other one of the coaxial dielectric resonators via a series resonant capacitor. The second inductance element is between one end of the first inductance element and the ground, and the third inductance elements is between the other end of the first inductance element and the ground.

Abstract: In enhancing signal quality through packages, meta-materials may be used. Meta-materials are designed to make the signal act in such a way as to make the shape of the signal behave as though the permittivity and permeability are different than the real permittivity and permeability of the insulator used. In an example embodiment, a substrate (10) is configured as a meta-material. The meta-material provides noise protection for a signal line (15) having a pre-determined length disposed on the meta-material. The substrate comprises a dielectric material (2, 4, 6) having a topside surface and an underside surface. A conductive material (30) is arranged into pre-determined shapes (35) having a collective length. Dielectric material envelops the conductive material and the conductive material is disposed at a first predetermined distance (55) from the topside surface and at a second predetermined distance from the underside surface.

Abstract: A three-dimensional filter includes a pair of superconductor films opposed to each other, and a three-dimensional resonator made of dielectric and situated between the superconductor films, wherein one of the superconductor films is movable relative to the three-dimensional resonator.

Abstract: Various exemplary embodiments relate to an improved coupler for resonant cavities and dielectric resonators. The coupler may permit accurate tuning of electromagnetic signals within desired frequency ranges. The coupler may be secured to a movable tuning device by a plurality of securing members. Each securing member may be separate, having no contact with any other securing member.

Abstract: An electrical device that comprises a tunable cavity filter that includes a container and a post. The container encloses a cavity therein, wherein interior surfaces of the container are covered with a metal layer. The post is configured be movable through an opening in the container such that at least a portion of the post is locatable inside of the cavity.

Abstract: An ultra wide band-pass, absorptive band-reject filter has a pair of quadrature hybrid couplers cascaded and coupled by a phase shifting element and a matched pair of band-reject filters in two parallel paths. The matched pair of band-reject filters each rejects signals in a desired reject frequency band. The quadrature hybrid couplers each have an insertion loss amplitude crossover for signals propagated to terminals across the coupler that coincides with the reject frequency band. The phase shifting element is configured to have a phase shift of 180 degrees at frequencies in the reject frequency band. In a preferred embodiment, the pair of quadrature hybrid couplers are identical in performance and the band-reject filters are identical in performance with respect to a center frequency fn of the reject frequency band. The absorptive band-reject filter thereby provides an absorptive rejection response in the reject frequency band while a very wide pass-band frequency range is maintained.

Abstract: One embodiment of a high-frequency filter includes a band-rejection filter including a plurality of reflection-type resonance elements and a filter circuit element provided between the reflection-type resonance elements, wherein an electrical length between the reflection-type resonance elements between which the filter circuit element is provided is an odd multiple of 90 degrees in a rejection band of the band-rejection filter.

Abstract: A magnetically-tunable filter comprising a filter housing with two tunable resonator spheres made of magnetizable material, which are disposed one above the other in two filter arms. At least one filter arm provides a fin line or slot line disposed on a substrate layer and extending in the direction towards an electrical contact, and a common coupling aperture, thereby connecting the two filter arms to one another. In this context, one resonator sphere is positioned within each filter arm on each of the two sides of the coupling aperture.

Abstract: A microwave filter having a resonator comprising a cylindrical structure having conductive walls filled with a conductor material. The cylindrical structure is recessed inside a multi-layered substrate. First and second conductive coupling arms are disposed on the top layer of the substrate for coupling signals to the cylindrical structure. The conductive coupling arms are physically separated from the cylindrical structure by a dielectric layer. The first and second conductive coupling arms extend away from the center of the cylindrical structure to form a microstrip line. The cylindrical structure further comprises a bottom portion having a solid conductive bottom plate perpendicular to the axis of the cylinder. A bottom conductive ground layer separated from the conductive bottom plate by a second dielectric layer.

Abstract: A waveguide filter comprising a matching means for matching the filter. The waveguide filter comprises a housing comprising a cavity having a predetermined first volume. The matching means is in the form of a volume element having a predetermined second volume being matched to the first volume forming a predetermined volume to volume ratio. The matching means is fitted into the cavity in a fixed non-adjustable manner in relationship to the housing. The invention refers also to a method for manufacturing of such a waveguide filter.

Abstract: The invention relates to a direct-current blocking circuit, and a hybrid circuit device, a transmitter, a receiver, a transmitter-receiver and a radar device that have the direct-current blocking circuit. A dielectric substrate (2) is provided with a conductor layer (3) disposed parallel with the dielectric substrate (2), first and second planar lines (4, 5) each containing a part of the conductor layer (3), and a waveguide (6) containing a part of the conductor layer (3). The first and second planar lines (4, 5) are located on one surface (2a) side of the dielectric substrate (2) with respect to the conductor layer (3), and the waveguide (6) is located on another surface (2b) side of the dielectric substrate (2). In a transmission direction (X) of electric signals, as to the waveguide (6), its one end overlaps with one end of the first planar line (4), and its another end overlaps with one end of the second planar line (5).

Abstract: According to an embodiment of the present invention, an electromagnetic bandgap structure can include: at least three conductive plates; a first stitching via, configured to electrically connect any one of the conductive plates to another conductive plate; and a second stitching via, configured to electrically connect the one conductive plate to yet another conductive plate. In the electromagnetic bandgap structure of the present invention, the first stitching via can electrically connect the one conductive plate to another conductive plate by allowing a part of the first stitching via to be connected through a planar surface above the one conductive plate, and the second stitching via can electrically connect the one conductive plate to yet another conductive plate by allowing a part of the second stitching via to be connected through a planar surface below the one conductive plate.

Abstract: An actively tuned filter providing a constant bandwidth at a plurality of frequencies. The filter includes first and second electromagnetically coupled coiled resonators, each resonator having an open end configured to receive an input and a shorted end configured to connect the resonator to a ground. The filter further includes a variable capacitance allowing selection of a capacitance to be applied to the first and second resonators, each variable capacitance being connected to the shorted end of the first and second resonators between the resonator and the ground where the axes of the coils of the first and second resonators are aligned along a single axis.

Abstract: A filter of longitudinal axis Z includes: at least one resonant cavity delimited by walls made of a material that has a non-zero expansion coefficient; a dielectric resonator mounted in the cavity transversally to the axis Z; a mechanical device for compensating at least one resonance frequency of the cavity as a function of the temperature. The compensation device comprises: at least one rotationally mobile finger for each mode and for each cavity, the mobile finger penetrating to a fixed depth into the cavity via a pivot link, and an external mechanical actuator mounted parallel to the axis Z and mechanically coupled to the mobile finger, the external mechanical actuator being made of a material that has a coefficient of thermal expansion at least five times lower than that of the walls of the filter.

Abstract: A microwave cavity filter is configured for operation in the dual TE22N mode to realize a very high Q factor at very high frequency ranges. The microwave filter is formed from using one or more cylindrical cavities in which two orthogonal field polarizations of the TE22N mode are excited and coupled together by means of a coupling element. Different combinations of inter-cavity irises provide for both direct and cross-coupling of aligned field polarizations in adjacent cavities, as required, to realize complex filter functions. The irises may be formed in either a side or end wall of the cavities for both collinear and planar mount configuration. Negative mode coupling also allows for transmission zeros to be realized on either side of the filter passband.

Abstract: Proposed is an apparatus for silencing electromagnetic noise, characterized by a plurality of centrally symmetrical ring-shaped through-via-hole crystalline units provided between a high voltage plane and a low voltage plane at a regular interval, thereby forming an omnidirectional noise suppression frequency band for reducing noise interference and electromagnetic radiation. In a first embodiment of the ring-shaped through-via-hole crystalline units, the through via holes are perpendicularly coupled between a metal plane and the low voltage plane. In a second embodiment of the ring-shaped through-via-hole crystalline units, the through via holes are perpendicularly coupled between two metal planes. Positioned at a regular interval, the through via holes enable provision of omnidirectional noise suppression frequency band, simplified design of a power plane, and reduction of production costs.

Abstract: Novel quadruple-mode, dual-mode, and dual-band filters as well multiplexers are presented. A cylindrical dielectric resonator sized appropriately in terms of its diameter D and length L will operate as a quadruple-mode resonator, offering significant size reduction for dielectric resonator filter applications. This is achieved by having two mode pairs of the structure resonate at the same frequency. Single-cavity, quad-mode filters and higher order 4n-pole filters are realizable using this quad-mode cylindrical resonator. The structure of the quad-mode cylinder can be simplified by cutting lengthwise along its central axis to produce a half-cut cylinder suitable for operation in either a dual-mode or a dual-band. Dual-mode, 2n-pole filters are realizable using this half-cut cylinder. Dual-band filters and diplexers are further realizable using the half-cut structure and full cylinder by carrying separate frequency bands on different resonant modes of the structure.

Abstract: A coupling structure for a microwave filter including at least one coupling rod located adjacent a transformer.

Abstract: An cavity filter includes a housing, a plurality of resonators received in the housing, a cover covering the opening, a sliding plate, and a plurality of tuning posts. The housing defines an opening and comprises at least one pair of positioning portions. The plurality of tuning posts is fixed in the cover corresponding to the plurality of resonators. The sliding plate is disposed between the cover and the plurality of resonators, and is slidably positioned at the at least one pair of positioning portions. The sliding plate comprises a plurality of tuning cells and at least one elastic arm. The plurality of tuning cells is coated with a metallic layer and corresponds to the plurality of resonators. The at least one elastic arm extends from the sliding plate and elastically resists the cover.

Abstract: An electromagnetic bandgap structure is disclosed. In accordance with an embodiment of the present invention, the electromagnetic bandgap structure can include a dielectric layer, a plurality of conductive plates, placed on a planar surface which is different from that of the dielectric layer, vias, of which each is connected to each of the conductive plates, respectively, and penetrates through the dielectric layer from one end part that is connected to the conductive plates, and a conductive trace, which connects the other end parts of the vias with each other such that all of the conductive plates are electrically connected.

Abstract: An LC composite electronic component, having a large noise suppression effect without increasing in size, includes a multilayer structure in which first and second capacitor units (10), (20) and first and second coil units (30), (40) are stacked and incorporates four LC resonance circuits. A noise circulating capacitance (C21) is formed between a coil electrode (31a) and a resonance adjusting electrode (51a), and a noise circulating capacitance (C22) is formed between a coil electrode (31c) and a resonance adjusting electrode (51b). A noise circulating capacitance (C23) is formed between a coil electrode (42a) and a resonance adjusting electrode (53a), and a noise circulating capacitance (C24) is formed between a coil electrode (42c) and a resonance adjusting electrode (53b). A noise circulating capacitance (C25) is formed between lead-out electrodes (32a), (41b), and a noise circulating capacitance (C26) is formed between lead-out electrodes (32d), (41d).

Abstract: A tuneable resonator filter consisting of cavity resonators. In the partition wall separating the successive resonators on the transmission path of a resonator filter there is a coupling opening (CPO) with a typically constant width. The coupling strength between the resonators is adjusted by a tuning element which is supported to the partition wall on the opposite sides of the coupling opening so that it can be moved. The tuning element is conductive and grounded so that the impedance between its ends and the partition wall is low. For moving the tuning element, it is linked by a dielectric rod to an electrically controllable actuator being located on the filter lid. By means of the tuning mechanism the bandwidth of a filter can be set automatically.

Abstract: A high frequency filter with a wider bandwidth is proposed based on an electromagnetic wave interacted with metamaterial following a left-handed rule and an electromagnetic wave interacted with traditional material following a right-handed rule, and the high frequency filter includes a plurality of filter units arranged in an array and disposed on the same plane, and each filter unit includes a first metal layer, a second metal layer and a dielectric layer, and the first metal layer and the second metal layer are stacked on two opposite sides of the dielectric layer respectively, and the filter is applicable to filtering wave with a frequency of 60 GHz.

Abstract: Disclosed are an electromagnetic bandgap structure and a printed circuit board. In accordance with an embodiment of the present invention, the electromagnetic bandgap structure can include a dielectric layer; a plurality of conductive plates; a stitching via, configured to pass through the dielectric layer and have a part electrically connecting the conductive plates to each other by connecting through a planar surface that is different from a planar surface of the conductive plates, and a through via. Here, the dielectric layer, the conductive plates and the stitching via can be placed between any two conductive layers, and the through via can be configured to pass through a clearance hole formed in the conductive layer and electrically connect the two conductive layers to each other.

Abstract: A transceiver includes a local oscillation module, a transmitter section, and a receiver section. The local oscillation module is operable to generate a transmit local oscillation and a receive oscillation. The transmitter section includes a transmit mixing module and a transmit weaved connection that is operable to high frequency filter the transmit location oscillation. The transmit mixing module mixes the filtered transmit location oscillation with a transmit signal to produce an up-converted signal. The receiver section includes a receive mixing module and a receive weaved connection that is operable to high frequency filter the receive location oscillation. The receive mixing module mixes the filtered receive location oscillation with an RF received signal to produce a down-converted signal.

Abstract: A TE011 cavity filter assembly is disclosed. The system includes at least one resonator operating in TE011 mode having a resonant frequency. The at least one resonator may include a cavity comprising an inner diameter and a cavity length. The at least one resonator may also include a first metal disc inside the cavity. The first metal disc may include a disc diameter and a void in the metal disc, which includes a void diameter and a void depth. The inner diameter of the cavity may be greater than the disc diameter creating a gap with a gap width and a gap depth. The TE011 cavity filter assembly may further include positive coupling.

Abstract: A radio frequency filter comprising: housing body having input/output connectors and containing space which is divided into spaces by means of diaphragm; at least one resonator rod arranged in the housing; housing cover coupled to the housing body; wherein the housing body and the housing cover are coupled to each other by laser welding. The radio frequency filter according to the present invention can reduce PIMD due to reduce Contact Nonlinearity, and inhibit to erode away because the laser welding method dissolve different metallic materials each other and take a convalent bond, and reduce its manufacturing process time and cost because it is unnecessary drilling a hole and fastening a screw to fasten the housing and the housing cover each other and can simplify its manufacturing process and raise productivity because only irradiate laser beam on irradiated area of the housing cover.

Abstract: A controllable filter arrangement with a voltage controlled device that subjects a signal to a predetermined impedance as part of the filtering process when the voltage controlled device is in an active state. In an inactive state, the voltage controlled device may subject the signal to an impedance that prevents all frequencies of the signal from passing. This configuration may advantageously increase frequency selectivity and reduce insertion loss, size, cost, and tuning complexity when compared with conventional filter designs.

Abstract: A filter includes a cross-coupling link which includes a crossbar, a first vertical support attached to one end of the crossbar, a second vertical support attached to another end of the crossbar, a first coupling arm attached to the first vertical support, a second coupling arm attached to the second vertical support, a first adjustable support attached to the first coupling arm at one end and grounded at another end, and a second adjustable support attached to the second coupling arm at one end and grounded at another end.

Abstract: The present invention provides a filter circuit that can achieve both sharp bandpass characteristics and high power handling capability. The filter circuit includes: an input terminal that has a signal input; a four-port device that divides input signals; a band stop filter that has the center frequency of the input signals within the stopband, and causes the out-of-stopband signals among the input signals to pass; two bandstop resonators circuits that cause the signals passing through the band stop filters to pass, and reflect the signals; open ends that are connected in parallel to the two bandstop resonators circuits; and an output terminal that outputs the signals reflected by the band stop filters and the bandstop resonators circuits and combined at the four-port device.

Abstract: A resonator cavity for supporting a plurality of resonant modes and filtering electromagnetic energy includes a cavity and a resonator element with a mounting flange. The cavity is defined by a top end wall, a bottom end wall and a sidewall and has a longitudinal axis along its length is defined. The resonator element is positioned within the cavity along the longitudinal axis and includes a mounting flange. The resonator element is only in physical contact with the cavity through the mounting flange at a mounting location and where at least one resonant mode of the electromagnetic energy exhibits a local minima. The dimensions of the cavity and the resonator element are selected so that the associated electromagnetic energy is defined by an electromagnetic field pattern that substantially repeats itself at least twice along the length of the resonator.

Abstract: A meta-material filter that may be used in constructing a duplex filter is provided. The metal-material filter is comprised of a substrate, a plurality of metal strips periodically positioned on the substrate, and a ground plane spaced from the plurality of metal strips. The plurality of metal strips may be arranged mono-periodically or bi-periodically.

Abstract: Various exemplary embodiments include a cavity having a tuning assembly with tunable capacitive coupling. The tuning assembly may have a recess having a specified depth, designed for a default magnitude of coupling into the cavity. A sleeve may be fully inserted within the recess to have the structure operate at that default coupling magnitude. If a different amount of coupling is desired, the sleeve may be inserted to a particular depth that only includes part of the recess, enabling repeatable tuning of a plurality of cavities.

Abstract: An electromagnetic-wave suppression structure in a multilayer PCB or package structure is supplied with a power to be used therein by a power distribution network including a power plane and a ground plane. The multilayer PCB and package includes: an electromagnetic-wave suppression structure including an electromagnetic band-gap; and the electromagnetic-wave suppression structure is formed at a specific portion(s) of the power plane and/or the ground plane to suppress noises.

Abstract: Provided is an apparatus for transitioning a millimeter wave between dielectric waveguide and transmission line using a millimeter wave transition structure formed by the dielectric waveguide, the transmission line, and a slot to transition a signal with lower losses. The apparatus includes: transmission lines disposed respectively at input and output terminals on an uppermost dielectric substrate in a signal transition direction and adapted to transition a signal; a dielectric waveguide formed by a via array disposed between top and bottom ground surfaces of a lowermost dielectric substrate in the signal transition direction as a signal transition path; and slots disposed at a signal transition path of an upper ground surface of each dielectric substrate to connect the transmission lines to the dielectric waveguide so as to transition a signal from the transmission line of the input terminal to the transmission line of the output terminal through the dielectric waveguide.

Abstract: In a wall of a package base made of aluminum or aluminum alloy, there is formed a through-hole, through which a semi-rigid coaxial cable passes. A central conductor of the semi-rigid coaxial cable is joined to an electrode with a solder material. The semi-rigid coaxial cable has an insulating material through which the central conductor passes and an outer conductor provided therearound. The central conductor and outer conductor are made of stainless steel, for example, and the insulating material is made of fluororesin, for example. Inside the through-hole, the wall of the package base and the outer conductor are electrically connected to each other via a stainless material within the hole formed in a cylindrical fluororesin material. The semi-rigid coaxial cable and the like are fixed to the wall with a conductive screw.

Abstract: An amplifier includes: an input terminal configured to have an input signal of a center frequency f0 input; a dividing unit that divides the input signal; first through ith blocks configured to have the divided input signal transmitted; a combining unit that combines signals transmitted through the blocks; and an output terminal that outputs the signals combined by the combining unit. The nth block includes a nth former-stage resonator having a fundamental resonant frequency fn, a nth amplifying unit, a nth latter-stage resonator having the fundamental resonant frequency fn, and a nth phase adjusting unit. Each latter-stage resonator having a harmonic resonant frequency either fa or fb, satisfies relationship fa<2f1, fb>2f1, (fa+fb)/2=2f0 The phase adjusting unit is configured to reverse the phase of signals passing adjacent blocks and maintain all phase differences among signals of 2fn passing through the nth block in the coordinate-phase.

Abstract: A notch filter suitable for attenuating certain frequencies of a radio-frequency signal includes an input for receiving the radio-frequency signal and an output for the output of a portion of the radio-frequency signal, first and second capacitive means, at least one inductor and a negative resistance circuit suitable for compensating the resistive losses of said at least one inductor. The inductor and the first and second capacitive means are placed to produce a resonator and the filter comprises a control device suitable for controlling the negative resistance circuit. The input impedance of the filter comprises a pole and a zero, with the pole depending on the second capacitive means and the zero depending on both the first and second capacitive means. The first and second capacitive means are variable and the control device is suitable for controlling the first and second capacitive means.

Abstract: An electro-magnetic bandgap structure is disclosed. The electro-magnetic bandgap structure in accordance with an embodiment of the present invention includes a plurality of conductive plates bridge-connected with one another on a same plane, whereas the each of the conductive plates includes an internal patch; a first ring patch be electrically separated from the internal patch and surrounding the internal patch; and a second ring patch surrounding the first ring patch and electrically connected with the first ring patch through a portion.

Abstract: A signal transmission circuit includes a transmitting circuit for outputting a transmitting signal to a transmission line, a parallel circuit including a capacitor and a first resistance connected between an output terminal of the transmitting circuit and the transmission line, and a series circuit including an inductor and a second resistance connected between an output side of the parallel circuit and a ground.