Abstract:
The invention relates to an electronic power device comprising a low pass filter device of the following type and the damping device or means for damping high frequency alternating current conducted therethrough, the damping device (2, 2', 2", 20, 21, 22, 23, 24, 25) comprising: a main conducting portion (3, 300) with a first end (4.1, 400.1) and a second end (4.2, 400.2) connected by a main axis (4). The damping device (2, 2', 2", 20, 21, 22, 23, 24, 25) further comprises at least one peripheral conducting element (5, 50, 500, 5000) electrically contacting the main conducting portion (3, 300) and protruding away from said main conducting portion (3, 300) respectively between the first end (4.1, 400.1) and the second end (4.2, 400.2) for high frequency AC damping.
Abstract:
The invention relates to a magnetically tunable filter (1) which comprises a filter housing (2) and two tunable resonator spheres (3a, 3b) that consist of a magnetizable material and are arranged one on top of the other in two filter arms (4a, 4b). At least one filter arm (4a, 4b) has a finline (7) or slotline, arranged on a substrate layer (5) and extending in the direction of an electrical terminal (6), and a joint coupling hole (8), by means of which the two filter arms (4a, 4b) are interconnected. One respective resonator sphere (3a, 3b) is positioned on each of the two sides of the coupling opening (8) within the filter arms (4, 4b).
Abstract:
In the direct current cut structure of the present invention, two capacitors are provided in parallel between signal transmission line patterns facing each other on a substrate, and each of the two capacitors is electrically connected to each surface of each transmission line pattern that is exposed through a hole part provided on the substrate. It is preferable for the two capacitors to have different capacity. If there is no need to cover such a broad band, only one capacitor can also connected to either side of each transmission line pattern exposed through the hole part.
Abstract:
The invention relates to RF bandpass filters with pseudo-elliptic response. In a filter comprising a dielectric substrate 302 placed in E position in a rectangular waveguide 301 and comprising inserts 303-306 on one of the surfaces of the substrate are placed conductors linked electrically to the walls of the guide, and on the other surface of the substrate opposite these conducting inserts are placed electrically floating inserts that make it possible to determine zeros in the transmission curve of the filter. This yields a filter exhibiting a response curve of pseudo-elliptic type which improves the rejection of spurious frequencies without increasing the dimensions of the filter.
Abstract:
A highly compact band pass filter that has excellent mechanical strength is disclosed. A band pass filter according to the present invention employs a dielectric block of substantially rectangular prismatic shape constituted of a first portion lying between a first cross-section of the dielectric block and a second cross-section of the dielectric block substantially parallel to the first cross-section and second and third portions divided by the first portion and metal plates formed on surfaces of the dielectric block. The first portion of the dielectric block and the metal plates formed thereon are enabled to act as an evanescent waveguide. The second portion of the dielectric block and the metal plates formed thereon are enabled to act as a first resonator. The third portion of the dielectric block and the metal plates formed thereon are enabled to act as a second resonator. The metal plates include at least one exciting electrode formed on a first surface of the dielectric block which has the widest area. Thus a wide band characteristics can be obtained whereas the very thin dielectric block is used. Further, a high unloaded quality factor ( Q 0 ) can be obtained because the radiation loss is lowered when the thickness of the dielectric block is reduced.
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:
In a sleeve in a radio frequency filter at least one portion having a lateral dimension being smaller than the diameter of a screw to be threaded through the sleeve is provided. The portion is flexible in a radial direction, so that a screw threaded through the sleeve will be secured by a clamping force. The increased friction provided by this clamping force will hold the screw in a locked position. The magniture of the clamping force can be varied within broad ranges, and the optimum force will be different for different applications. Thus, by using such a screw and sleeve, there is no need for a lock nut and the screw does not need to be readjusted once placed in the correct position.