Abstract:
A resonator is provided comprising a resonant chamber, each chamber comprising a first wall, a second wall opposite the first wall and side walls. The resonant chamber houses three or more resonator posts that are spaced apart, each resonator post being grounded on one of the first wall and the bottom wall. A first set of the resonator posts being grounded on the first wall so as to extend into the chamber from the first wall. A second set of the resonator posts being grounded on the second wall so as to extend into the chamber from the second wall. Each resonator post of the first set is for magnetic field coupling in proximity with at least one of the resonator posts of the second set.
Abstract:
A dielectric substrate (12) includes a filter unit (20), a non-balance/balance conversion unit (22), and a connection unit (24) for electrically connecting the filter unit (20) to the non-balance/balance conversion unit (22) which are formed in the dielectric substrate (12). A first resonator (26) has an electrode (36) formed on the main surface of a fourth dielectric layer (S4) and a via hole (38) penetrating through a first to a third dielectric layers (S1 to S3) and connecting the electrode (36) to a grounding electrode (18). A second resonator (28) has an electrode (42) formed on the main surface of the fourth dielectric layer (S4) and a via hole (44) penetrating through the first to the third dielectric layers (S1 to S3) and connecting the electrode (42) to the grounding electrode (18).
Abstract:
A dielectric filter comprises an input terminal (1), an output terminal (2), and a voltage control terminal (3), a plurality of dielectric resonators (5, 6, 7) electrically connected between said input terminal (1) and said output terminal (2), a first adjustable capacitance element (D1) electrically connected to at least one of said plurality of dielectric resonators (5, 6, 7) and to said voltage control terminal (3), the first adjustable capacitance element (D1) being adjustable by a control signal from said voltage control terminal (3), and the first adjustable capacitance element (D1) being on a first path interconnecting at least two of said plurality of dielectric resonators (5, 6, 7) of a bandpass filter, a second adjustable capacitance element (D2) electrically connected to at least one of said plurality of dielectric resonators (5, 6, 7) and to said voltage control terminal (3), the second adjustable capacitance element (D2) being adjustable by a control signal from said voltage control terminal (3), and the second adjustable capacitance element (D2) being on a second path interconnecting at least two of said plurality of dielectric resonators (5, 6, 7) of said bandpass filter, wherein the first path and the second path provide respective attenuation poles of said bandpass filter.
Abstract:
The invention relates to a high-pass filter realized in a conductive casing by means of mechanical structural elements, which filter is suitable for signal processing especially at microwave frequencies. In the casing (201, 202, 203) there are in series rigid conductive elements (2IN, 210, 220, 230, 2OUT) separated from each other. Between successive elements there is capacitance that can be adjusted within certain limits, if necessary. The insulating material between the elements is air or plastic, for example. At least some of the conductive elements involve a conductor (214, 224) less than half a wavelength long, short-circuited at the opposite end to the casing. This together with the casing connected to the signal ground provides a transmission line which, looking from the conductive element, is inductive at the operating frequencies. A signal path is thus provided in the filter with capacitance in the longitudinal direction and inductance in the transversal direction between each two capacitive elements. The structure is simple and sturdy, which means relatively good power handling capacity and reliability. In addition, the structure has few boundaries that may cause harmful intermodulation.
Abstract:
The object of the present invention is a modular coaxial resonator construction and a filter that is realized with said construction. As described in the invention, the resonator is formed from two or more blocks, or modules, with a square cross section that are fastened to each other. The conductively plated surfaces of the modules form the center conductor and at least part of the shield of the resonator. The dielectric layer is formed from the module material, which typically is ceramic. The module blocks are advantageously made by cutting them from ceramic substrate. The resonator or filter can be manufactured without special tools, e.g., by manually assembling it from modules or by using automatic assembly methods that are known from printed circuit board assembly.
Abstract:
A dielectric resonator (5) is electrically connected to an input terminal (1) through a coupling capacitor (C1). A dielectric resonator (6) is electrically connected to an output terminal (2) through a coupling capacitor (C3). The dielectric resonators (5, 6) are electrically connected to each other through a coupling capacitor (C2). A voltage control terminal (3) is electrically connected to the cathode of a variable-capacitance diode (D1) and to one end of the coupling capacitor (C1) through a choke coil (L1). The anode of the variable-capacitance diode (D1) is electrically connected to the dielectric resonator (6). That is, the variable-capacitance diode (D1) is used as a multipath circuit element of a filter (15).
Abstract:
A harmonic filter is added to a radio frequency filter comprising at least one transmission line resonator (R1; R2; R3) to filter harmonic multiples of the filter's operating frequency. Coupling to the harmonic filter occurs through matching couplings and transmission lines (7; L1 to L9; L20; L28) in the filter or via the electromagnetic field of said transmission line resonator (R1; R2; R3). The harmonic filter advantageously comprises striplines (L13 to L19; L21 to L27; L29 to L49) manufactured in conjunction with the other stripline structures in the filter.
Abstract:
Filtre à cavités, à structure en peigne, présentant une bande passante à flanc raide. Pour obtenir ce flanc raide des résonateurs réjecteurs (R1e, R2e, R2s, R1s) sont disposés au voisinage des barreaux d'accès (Be, Bs) du filtre, orthogonalement aux dents (B1, B2, B3) de la structure en peigne ; les meilleurs résultats sont obtenus pour le flanc correspondant aux fréquences hautes de la bande passante c'est-à-dire avec des résonateurs réjecteurs accordés sur des fréquences supérieures à la fréquence centrale de la bande passante. Application, en particulier, aux radioaltimètres.