Abstract: MLC (multilayer ceramic) frequency selective circuit structures are disclosed. The MLC frequency selective circuit structures have a solenoid and toroid coil geometry in a multilayer electronic package which functions as a frequency selective tuned circuit in which both the number of turns and the aspect ratio of the solenoid coil are selected to adjust the tuned frequency. In some embodiments, a plurality of such coils can be connected together to provide a selected bandwidth about a tuned center frequency.

Abstract: The present invention tunes a coupled resonator filter to a given tuning specification using a reference filter that was previously tuned to the specification. A method of tuning a subject filter comprises determining a frequency change for each resonator of the subject filter and applying each determined change to the respective resonator, such that the subject filter is tuned to the specification. The frequency changes are determined from frequency-pushing interactions between combinations of resonators in either the reference or subject filter. A system for tuning the subject filter comprises a measurement system, a tuning program stored in a system memory, and a controller that controls the measurement system and executes the tuning program. The tuning program comprises instructions that preferably implement the tuning method. A tuned coupled resonator filter comprises a plurality of resonators that are adjusted in accordance with the method or using the tuning system.

Abstract: A lumped filter includes an input terminal, an output terminal, and a ground electrode disposed on a dielectric film on an alumina substrate. A first spiral inductor is connected between the input terminal and the ground electrode. A second spiral inductor is connected between the output terminal and the ground electrode. MIM capacitors are inserted between the input terminal and the first spiral inductor, and between the output terminal and the second spiral inductor. A third spiral inductor is inserted between the first and second spiral inductors. The spiral inductors have self-inductance, and capacitance between the spiral inductors and the electrodes adjacent thereto, by which the spiral inductors self-resonate and define as parallel LC resonators.

Abstract: A filter is applied between a digital signal source and a signal receiver for providing compensation of droop caused in a transmission path between the signal source and the signal receiver. The filter provides a high pass characteristic substantially approximating or following in a relevant frequency range an attenuation function substantially proportional to e−k{square root over (f)} or—when denoting attenuation in dB—substantially proportional to the square root of the frequency.

Abstract: In a monolithic LC filter, bent portions of external electrodes are formed by applying and firing a conductive paste in the areas of first to eighth bent segments that are formed by pattern printing, photolithography, or a thin-film forming method. The third, fourth, seventh, and eighth bent segments, which are used to form ground external electrodes, cover openings disposed between extensions of shield electrodes in the composite of the monolithic LC filter.

Abstract: A multi-layer wiring board comprises an insulating substrate having, on a central part of its top surface, a semiconductor device mounting portion and having, on its under surface, an external electrode. The insulating substrate includes a multilayered wiring having a first group of parallel wiring lines; a second group of parallel wiring lines arranged orthogonal thereto; and a group of through conductors for providing electrical connection therebetween. Power is supplied from the external electrode to the semiconductor device through built-in capacitors formed therewithin. The built-in capacitors are connected in parallel that have different resonance frequencies within a range from an operating frequency band for the semiconductor device to a frequency band for a harmonic component, and at an anti-resonance frequency occurring between the different resonance frequencies, a composite impedance is equal to or below a predetermined value.

Abstract: The disclosure pertains to continuous-time filtering. More particularly, it relates to filtering in a feedback control loop, for example in a sigma-delta (&Sgr;&Dgr;) modulator. The making of a filter for this type of application comes up against a major problem linked to the relativity between the amplitude and phase responses. This limits the possibilities of choice in order to take steps against the instability of the loop. A continuous-time filter with minimum phase variation carries out the bandpass integration of the signal presented at its input. The making of the continuous-time filter as a bandpass integrator raises the problem of achieving a compromise between gain variations and phase variations close to the −1 critical point, This compromise must lead to the stability of the loop. This problem is resolved by using a continuous-time bandpass integrating filter comprising at least one resonance device with minimum phase variation.

Abstract: A constant impedance filter maintains a constant input impedance for frequencies that are both inside the filter passband and outside the filter passband. The constant input impedance appears as a pure resistance. The constant impedance filter includes a plurality of filter poles that are connected in series. Each of the filter poles include an inductor, a capacitor, and a resistor. The value of the inductor, the capacitor, and the resistor are selected to provide a constant input impedance over frequency for each pole of the filter, which produces a constant input impedance for the entire filter over frequency. The constant impedance filter can be implemented as a low pass filter, a high pass filter, or a bandpass filter. Furthermore, the constant impedance filter can be implemented in a single-ended configuration or a differential configuration.

Abstract: An electrical signal filter including elongate upper and lower filter housing members abutted along a longitudinal seam between the housing members. The housing members hold at least one circuit board. A ground post is formed integrally with the lower filter housing member and is secured to the circuit board without solder. First and second mechanical engagement members are used to rotationally secure end caps to the housing members without solder. As a result, assembly of the filter components can be accomplished without the need for expensive soldering operations, thus reducing the overall manufacturing cost of the filter.

Abstract: An inductive (“L”)-capacitive (“C”) filter bank has application for use in a television receiver. The LC filter includes inductors configured in at least one inductive (“L”) bank, and capacitors configured in at least one capacitive (“C”) bank. The inductors and capacitors are selectively enabled so as to configure an LC filter with at least one inductor from the L bank and at least one capacitor from the C bank. A combination of inductors and capacitors are selected through the semiconductor switches so as to maximize a Q factor for the LC filter.

Abstract: Disclosed is a high-temperature superconductor low-pass filter for removing broadband harmonics in a wireless communication system. The high-temperature superconductor low-pass filter includes a coupled line section and a transmission line section, in which the coupled line section is connected in parallel with the transmission line section. The coupled line section has two microstrip open-stub type parallel stripe lines stacked on a high-temperature superconductor, and the transmission line section has one stripe line. Since the high-temperature superconductor low-pass filter has attenuation poles at a stopband, it has stopband characteristics to 7-8 times wider than a cutoff frequency. The high-temperature superconductor low-pass filter can easily remove sub-harmonics which are inevitably occurred in the wireless communication system.

Abstract: A small high frequency circuit component has very small variations in stray capacitance generated between an inductor electrode pattern and a capacitor electrode pattern. As a result, the variations in the characteristics thereof are also small. The inductor electrode pattern is overlaid with the capacitor electrode pattern in a plan view. That is, when viewed from the lamination direction, the projection of the inductor electrode pattern onto the capacitor electrode pattern is included within the capacitor electrode pattern. More particularly, outer dimensions W1, L1, D1 of the inductor electrode pattern and corresponding outer dimensions W2, L2, D2 of the capacitor electrode pattern satisfy the following conditions, respectively: W2=W1+&Dgr;, where 0.1 mm≦&Dgr;≦1.0 mm, L2=L1+&Dgr;, where 0.1 mm≦&Dgr;≦1.0 mm, and D2=D1+&Dgr;, where 0.1 mm≦&Dgr;≦1.0 mm.

Abstract: The present invention relates to a force sensing device, and in particular to a force sensing device for sensing an oscillating force or for application as a filter. In general terms, the invention proposes a force sensing device having a magneto electric material and a magnetic element moveable relative thereto in response to an applied force. The magneto electric material is exposed to the magnetic field of the magnetic element which has a magnetisation direction parallel to the direction of the movement.

Abstract: A new type of frequency-tunable active notch filter achieves frequency selectivity through interaction among input derived signal components that are passed through parallel signal channels in a forward-only direction. The notch filter differs from earlier channelized notch filters by using multiple, instead of just one, bandpass channels that maintain required forward signal flow in the main, passband-determining signal path without signal distortion at passband frequencies. The new approach has been experimentally verified with a hybrid-integrated three-channel filter whose 40-dB-deep band-reject notch can be continuously tuned, with the help of voltage-controlled variable-capacitance elements, from 9.5 to 10.5 GHz. A single-pole bandpass filter tunes in frequency with the help of only one variable capacitance element, yet still maintains constant passband width across the tuning span.

Abstract: Here disclosed is a parallel-resonance type band-pass filter, which is employed for mobile communications equipment such as a mobile phone. According to the filter, each resonator has a single capacitor and serially connected plural inductors both of which are formed on the surface or on an inner layer of a substrate. Electromagnetic coupling between the resonators is established through electromagnetic coupling between at least a pair of inductors—the inductors of the pair belong to respective resonators. The input and the output terminals are coupled with the respective resonators via the capacitor having a properly determined capacitance. With such a simple structure, the filter also can work as an impedance transformer, with the result that the mobile communications equipment will be much smaller.

Abstract: A filter includes a substrate with a relative dielectric constant of 200 or less and a thickness of 0.1 mm or more. A first electrode is disposed on at least one surface of the substrate, a group of second electrodes is disposed on at least the other surface of the substrate. Each of the second electrodes is not in contact with each other and is not in contact with the first electrode. The filter also includes a chip type inductance element. The chip type inductance element has an inductance ranging from 0.1 nH to 30 nH and has dimensions of L1 in length, L2 in width and L3 in height, which satisfy the following conditions; 0.3 mm<L1<2.1 mm 0.1 mm<L2<1.1 mm 0.1 mm<L3<1.1 mm.

Abstract: A new type of frequency-tunable active notch filter achieves frequency selectivity through interaction among input derived signal components that are passed through parallel signal channels in a forward-only direction. The notch filter differs from earlier channelized notch filters by using multiple, instead of just one, bandpass channels that maintain required forward signal flow in the main, passband-determining signal path without signal distortion at passband frequencies. The new approach has been experimentally verified with a hybrid-integrated three-channel filter whose 40-dB-deep band-reject notch can be continuously tuned, with the help of voltage-controlled variable-capacitance elements, from 9.5 to 10.5 GHz.

Abstract: A radio-frequency input stage is specified and has a radio-frequency coupling element which couples an air interface to the inputs of parallel-connected radio-frequency resonant circuits. In order to allow a circuit configuration which has no switches and is of simple construction, only one capacitance, which forms a low-pass filter, is provided in the coupling element, and splits an antenna signal between the various bands, in the process suppressing influences from bands other than that which has been selected. The radio-frequency input stage can be used, for example, in three-band TV tuners.

Abstract: The present invention provides a balanced input/output filter device comprising two resonators, a pair of coupling capacitors, a positive input terminal and a negative input terminal, and a positive output terminal and a negative output terminal. Both sides of one resonator are serial connected to spiral-type inductors on the other metal layers, and both sides of the other resonator are serial connected to parallel-type capacitors on the other metal to layers. The coupling capacitors couple between the spiral-type inductors and the parallel-type capacitors respectively, and the output and input terminals are coupled to the spiral-type inductors and parallel-type capacitors respectively, which are coupled to the resonators.

Abstract: A thin-film bandpass filter is provided. The thin-film bandpass filter includes a substrate, a plurality of first capacitors formed on the substrate, each being electrically connected in series, at least one second capacitor electrically connected to branch terminals positioned between the plurality of first capacitors, an inductor electrically connected in parallel to the second capacitor, and a plurality of supports for propping up the inductor so that the inductor is separated a predetermined space above the substrate and/or the second capacitor. The first and second capacitors, respectively, include a first metal layer, a dielectric layer, and a second metal layer, all of which are sequentially formed on the substrate. The inductor is comprised of a predetermined pattern of a thin-film metal layer propped by the plurality of supports, to both ends of which are electrically connected to the first and second metal layers of the second capacitor, and suspended by the substrate and/or the second capacitor.

Abstract: An apparatus and method are provided for attenuating an undesired frequency (f1) relative to a desired frequency (f0) in a signal transmitted from an out-put (220) of an active element (210). Generally, the apparatus includes a parallel-resonant trap (145) coupled to the output of the active element (210), the trap including a network of reactive elements (235).

Abstract: A multilayer LC filter includes two LC resonance circuits (21 and 22) in a two-stage circuit configuration. First and second resonator inductors (L21 and L22) formed by two strip-like electrical paths (14 and 15) extend laterally in parallel and are patterned on the same inductor layer (c). A strip-shaped shielding or ground path (35) is formed between, and in parallel with, the two strip-shaped electrical paths (14 and 15) such that the electrical paths are in the shape of a fork on the inductor layer c. The magnetic coupling between the resonator inductors (L21 and L22) is thus weakened and, even when pattern dislocations occur during the patterning of the paths, there is substantially no variation in the magnetic coupling characteristics of multilayer LC filters of this construction.

Abstract: A filter assembly, comprising first and second terminal caps in opposing relation to each other. The caps are physically and electrically coupled to each other. First and second circuit boards are physically coupled to the first cap. The first circuit board includes—(i) front and rear surfaces, (ii) a first circuit located on either or both of the front and rear surfaces, (iii) a ground lead connected to the first circuit, and (iv) a first electrical terminal coupled to the first circuit. The second circuit board includes—(i) front and rear surfaces, (ii) a second circuit located on either or both of the front and rear surfaces, (iii) a ground lead connected to the second circuit, and (iv) a second electrical terminal coupled to the second circuit. The first and second circuits are electrically coupled to each other, and each are electrically coupled to the first terminal cap via the ground leads. The circuit boards are positioned substantially parallel to each other.

Abstract: An LC-included electronic component has a greatly reduced size, a greatly increased resonator Q, and outstanding reliability. Inductor via holes are successively connected in a direction in which insulating sheets are stacked to define columnar inductors. The inductor via holes each have a Y-direction dimension greater than an X-direction dimension on the X-Y plane of a section shape, and the shape has Y-direction ends of increased width. Specifically, each Y-direction end of the inductor via holes is substantially circular, and the other portions are linear.

Abstract: A lamination type LC filter includes a laminated body in which inductor electrodes, capacitor electrodes, and internal ground electrodes constituting a resonance circuit are laminated through dielectric sheets. The inductor electrodes have bent shapes or curved shapes and a first end portion of the inductor electrodes is located in the vicinity of the central portion of the dielectric sheets, the middle portion thereof is located in the vicinity of the end portion of the dielectric sheets, and the second end portion thereof is located in the vicinity of the central portion of the dielectric sheets. The capacitance electrodes and the internal ground electrodes are preferably strip-shaped in the vicinity of the central portion of the dielectric sheets and are stacked one on top of another so as to be substantially parallel to each other.

Abstract: A method of designing and structuring an electronic component, specifically but not exclusively an equalizer component of the type which is intended to compensate for “cable loss” primarily attributable to the decay of certain signal characteristics including both frequency decay and amplitude decay over long distances of coaxial cable. The coaxial cable is of the type utilized in CATV-MATV broadband cable facilities. The method comprises the continues processing of a signal through a base circuit including circuit components of pre-established resistance and monitoring the predetermined signal characteristics at least including frequency and amplitude.

Abstract: Disclosed is a radio frequency filter used for a mobile communication apparatus such as a mobile phone, having an inductor component, a capacitor component, and a resistor component formed of a conductor pattern. The filter includes the conductor pattern formed on the surface of dielectric layer, and an adjusting layer for adjusting the frequency characteristic of the filter formed so as to cover at least a part of the conductor pattern. In the radio frequency filter, the conductor pattern is formed and sintered, followed by adjusting the frequency characteristic of the filter. Accordingly, in the radio frequency filter, the yield of the manufacture is improved. Further, the electrode layer can be single-layered by using extra-thin lines for the conductor pattern and interdigital electrodes for the capacitor. As a result, it is possible to make the filter smaller and thinner by using intaglio-printing technique and thin-film forming technique.

Abstract: A signal filter includes a main circuit board having two opposite sides each having a longitudinal grounding circuit formed on the main circuit board and two opposite ends each having a connector attached to the main circuit board. The connector has a metal portion electrically connecting to the grounding circuit of the main circuit board to promote the grounding effect of the signal filter. A tube is mounted around the two connectors to form a chamber to hold the main circuit board in the tube and prevent water vapor from permeating into the signal filter and damaging electric components in the signal filter.

Abstract: An LC high-pass filter circuit device includes an inductor defined by via holes formed in adjacent insulating sheets which are connected in the direction of stacking of the sheets so as to define a single trap inductor. Inductor via holes formed in another insulating sheet define separate high-pass filter inductors. The trap inductor and the high-pass filter inductors have axes which extend substantially perpendicularly to the planes of the insulating sheets. Each of the high-pass circuit inductors defines, in combination with a high-pass filter capacitor, a high-pass filter circuit, while the trap inductor defines, in combination with a capacitor, a trap circuit. The high-pass filter circuits and the trap circuit in combination define a small-sized LC high-pass filter circuit device which exhibits high Q value and which excels in frequency characteristics, as well as a laminated LC high-pass filter device, a multiplexer and a radio communication apparatus incorporating the LC high-pass filter circuit device.

Abstract: In accordance with the teachings of this invention a novel method and apparatus is taught which provides for the stabilizing of an output signal through an output circuit having a compensation circuit coupled with an output capacitor, such that the compensation circuit is configured to compensate for an equivalent series resistance of the output capacitor. The compensation circuit compensates for the equivalent series resistance by providing a shift in a phase of the output signal to stabilize the output signal. The shift in phase is accomplished through the addition of a second zero at a second zero frequency to stabilize the output signal. The second zero is added such that the second zero frequency is closer to a first pole frequency than a first zero frequency, where the first pole frequency is proportional to the equivalent series resistance and the first zero is proportional to the output capacitor.

Abstract: An elementary electrical resonator which includes a ribbon conductor forming a flat loop with at least one turn, the conductor having ends which form two parallel segments. The resonator further includes a conducting bridge which forms an arch straddling the two parallel segments of the ribbon conductor wherein opposing surfaces of the arch and the parallel segments form a capacitor. A part of the bridge is capable of being displaced with respect to the parallel segments under the action of a control signal so as to cause the capacitance of the capacitor and therefore the tuning frequency of the resonator to vary.

Abstract: A monolithic conduct includes a laminated stack of insulator sheets and inductor via-holes that are connected to each other in the direction in which the insulator sheets are laminated, thereby forming columnar inductors. Coupling adjusting via-holes are also connected to each other in the direction in which the insulator sheets are laminated, thereby forming a columnar coupling adjusting conductor. The columnar coupling adjusting conductor is disposed between and substantially parallel to the columnar inductors.

Abstract: A multilayered LC composite component in which a fine adjustment to a desired frequency can be performed, includes multilayered body sheets on which internal electrodes including capacitor electrodes and inductor electrodes are stacked via dielectric layers. On surfaces of the multilayered body sheets, there are disposed a ground internal electrode and input/output extraction electrodes. A trimming electrode is arranged on the multilayered body such that the trimming electrode is opposed to some of the internal electrodes and is electrically connected to the ground internal electrode. In order to make a rough frequency adjustment, insular electrodes are isolated from the trimming electrode by trimming grooves. Then, a coating material is filled in each of the trimming grooves to make a fine adjustment.

Abstract: The present invention provides a small and low loss laminated bandpass filter by placing two strip lines 313 and 314 that form a resonator in a certain distance on the same layer and thereby electromagnetically coupling these strip lines.

Abstract: A multi-layered LC filter includes a plurality of insulating sheets stacked on each other and inductor via holes that are connected to each other in a stacking direction of insulating sheets, forming two columnar inductors. First ends of the inductors are connected to external ground electrodes via internal ground patterns, respectively. The external ground electrodes are electrically connected via a bridge pattern disposed in proximity to the inductors, allowing adjustment of the value of the magnetic coupling between LC resonators without changing the size of the filter.

Abstract: The filter is composed of a series of cells (E1-E4) Coupled to each other by coupling capacitors (Cc12, Cc23 and Cc34), each cell forming a resonant circuit composed of at least one inductor (Ip1-Ip4) connected in parallel with at least one variable capacitor (Cp1-Cp4). The coupling capacitors (Cc12, Cc23 and Cc34) are variable capacitors. The filter is substantially symmetrical between its signal input (FI) and its signal output (FO). It finds applications notably for the transmission of channels in the UHF band, where it provides frequency agility.

Abstract: A bi-directional low-pass filter for use at a user end or an office end in a communication network is disclosed. By providing compensation and high-band attenuation circuitry, the low-pass filter exhibits an improved attenuation value in high-band and a general attenuation value in a low-frequency band. The satisfactory attenuation performance in the high-frequency band minimizes the signal interference of a high-band communication terminal with a low-band communication terminal in the communication network. Further, by providing symmetric input/output circuitry, the low-pass filter can be operated reversibly.

Abstract: A low-pass filter is defined by a laminate containing an inductor electrode, a plurality of capacitor electrodes, and at least two ground electrodes. The laminate is defined by a plurality of laminated dielectric layers. The low-pass filter includes a grounded capacitor defined by a capacitor electrode and the at least two ground electrodes, the capacitor being located between the ground electrodes, and an ungrounded capacitor including a capacitor electrode which is not located between the ground electrodes.

Abstract: An electrical signal filter including elongate upper and lower filter housing members abutted along a longitudinal seam between the housing members. The housing members hold at least one circuit board. A ground post is formed integrally with the lower filter housing member and is secured to the circuit board without solder. First and second mechanical engagement members are used to rotationally secure end caps to the housing members without solder. As a result, assembly of the filter components can be accomplished without the need for expensive soldering operations, thus reducing the overall manufacturing cost of the filter.

Abstract: A lumped filter includes an input terminal, an output terminal, and a ground electrode disposed on a dielectric film on an alumina substrate. A first spiral inductor is connected between the input terminal and the ground electrode. A second spiral inductor is connected between the output terminal and the ground electrode. MIM capacitors are inserted between the input terminal and the first spiral inductor, and between the output terminal and the second spiral inductor. A third spiral inductor is inserted between the first and second spiral inductors. The spiral inductors have self-inductance, and capacitance between the spiral inductors and the electrodes adjacent thereto, by which the spiral inductors self-resonate and define as parallel LC resonators.

Abstract: This invention provides a voltage tunable filter comprising an input connection point, an output connection point, and at least one circuit branch electrically coupled to the input connection point and the output connection point and including a voltage tunable dielectric varactor electrically connected to an inductor. The voltage tunable filter can be one of a low-pass, high-pass, band-pass, or band-stop filter. The varactor can include built-in DC blocking capacitors.

Abstract: An LC component includes a coil conductor spirally wound around the outer peripheral surface of a wound core member having a substantially rectangular cross-section. A dielectric layer is arranged so as to cover the coil conductor. A capacitor electrode is provided on the dielectric layer so as to wind approximately once around the wound core member in the peripheral direction of the wound core member. The capacitor electrode includes first, second, third, and fourth surfaces. The capacitor electrode is divided by two cut grooves. One cut groove crosses the capacitor electrode obliquely from one side of the first surface of the capacitor electrode to the other side of the second surface adjacent to the first surface. Similarly, the other cut groove crosses the capacitor electrode obliquely from one side of the third surface of the capacitor electrode to the other side of the fourth surface adjacent to the third surface.

Abstract: (Object)

Abstract: A passive low pass filter of a surface mounted device configuration has counter-wound coils and at least one capacitor. Each coil has a centerline. The centerlines are parallel to one-another and perpendicular to a plurality of plates of the capacitor. The windings of the coils and the plates of the capacitor are encased in a dielectric encapsulant.

Abstract: Disclosed is a high-temperature superconductor low-pass filter for removing broadband harmonics in a wireless communication system. The high-temperature superconductor low-pass filter includes a coupled line section and a transmission line section, in which the coupled line section is connected in parallel with the transmission line section. The coupled line section has two microstrip open-stub type parallel stripe lines stacked on a high-temperature superconductor, and the transmission line section has one stripe line. Since the high-temperature superconductor low-pass filter has attenuation poles at a stopband, it has stopband characteristics to 7-8 times wider than a cutoff frequency. The high-temperature superconductor low-pass filter can easily remove sub-harmonics which are inevitably occurred in the wireless communication system.

Abstract: A filter assembly includes a printed circuit board having a filtering circuit and a ground plane. A body receives the printed circuit board. The printed circuit board has at least one tab, and the body has a respective slot for receiving each tab, aligning the printed circuit board with the body. The body is shaped so as to provide a first cable connector at one end. The ground plane of the printed circuit board is connected to an inner wall of the body by solder. A nut fits on an end of the body opposite the cable connector of the body. The nut provides a second cable connector at an end opposite the first cable connector. The nut is connected to the body by solder along a periphery of the nut to form a water tight seal. The solder joining the nut to the body is continuous with the solder connecting the ground plane to the body. A pair of terminals are electrically connected at opposite ends of the printed circuit board.

Abstract: The magnetic field of an inductor is decreased by the presence of one or more single loop windings positioned in proximity to the inductor. The single loop windings have open circuits that are selectively closed to magnetically couple the single loop windings to the inductor. A switched inductor/varactor tuning circuit is formed by connecting a varactor to the inductor.

Abstract: A composite capacitor/inductor assembly has been developed that merges the capacitance utilized for energy storage into the inductor, creating a consolidated electrical component. The composite capacitor/inductor is capable of functioning in those applications requiring resonant circuits for frequencies in excess of 100 MHz. The composite nature of the device reduces by one-half the number of components required to produce a resonant circuit.

Abstract: An antenna (24) for minimizing reception of undesirable signals below a predetermined frequency band includes a first and a second terminal (A, A′) connectable to at least a receiver (22). The antenna components are connected to the first and second terminals, and a filter (26) is integrally connected across the first and second terminals (A, A′). The filter matches an impedance value of the antenna components with an impedance value of the receiver. Moreover, the filter effectively forms a short circuit at the undesirable frequency to minimize reception of undesirable signals below the predetermined frequency band.

Abstract: An apparatus is disclosed wherein a dual directional harmonics dissipation filter includes an input terminal coupled to a RF power amplifier providing a radio frequency signal in a predetermined frequency range, an output terminal for providing the radio frequency signal to a load at the predetermined frequency range, a low pass filter connected between the input terminal and the output terminal, and a plurality of high pass filters coupled to the low pass filter wherein the plurality of high pass filters receive and dissipate signals in excess of the predetermined frequency range and wherein the plurality of high pass filter's effect on the impedance is offset at the input and output of the low pass filter.