摘要:
An antenna system for small basic transmitter-receiver stations of a communications system for mobile radio operators, with at least one transmission channel and one reception channel which operate on separate frequencies, with at least two antennas which are embodied for redundant reception (reception diversity). Each antenna is used as a transmission antenna for at least one channel. The transmitting operation is carried out without redundancy so that each antenna is fed by a different transmission channel, and the reception diversity is realized so that at least one antenna is set to receive a channel which is associated with the transmission channel of another antenna. The antenna system can be employed in mobile radio networks, in particular the D- net and the E-net. Advantages of the antenna system are low cost, low transmission loss, and high channel flexibility, and above all, the prevention of system interferences as a result of intermodulation products.
摘要:
A junction (300) for connecting two waveguides having an angular offset between longitudinal symmetry axes of their cross-sections and a first linear offset of the center axes of the waveguides. The junction (300) comprises at least a first and a second transformer sections (202, 206) both having said first angular offset between longitudinal symmetry axes of their cross-sections and said first linear offset of their center axes, wherein each of said transformer sections (202, 206) has one protruded ridge (204, 208) on broad walls, wherein the first ridge (204) is mainly situated outside the cross section of the second transformer section 206 and the second ridge (208) is mainly situated outside the cross section of the first transformer section (202).
摘要:
A bandpass filter comprises a number of resonators which are arranged between an input and an output of the filter and which are interconnected to form at least two main signal paths that lead from the input to the output. The at least two main signal paths have overlapping passbands and are connected to the input and/or output via different resonators.
摘要:
In a waveguide twist which provides orthogonal rotation of both direction and polarization, TE10—mode energy in waveguide W1 is coupled via iris I1 to a transformer cavity capable of exciting both TE10 and TE01 modes. The TE01 mode is coupled via iris I2 to output waveguide W2. Transformers may be interposed between one or both waveguides and their associated irises to increase bandwidth. The configuration facilitates manufacture in two halves by simple machining or casting.
摘要:
A microwave filter has at least two resonators, with at least two degenerated wave types resonance-capable in one resonator. The resonators are in operative connection with one another so that possible couplings of the degenerated wave types are only overcouplings and these overcouplings are located outside the resonator in which the two degenerated wave types are resonance-capable. As a result, the microwave filter has higher quality, improved selection properties and optimal polarization adapation.
摘要:
A junction (300) for connecting two waveguides having an angular offset between longitudinal symmetry axes of their cross-sections and a first linear offset of the center axes of the waveguides. The junction (300) comprises at least a first and a second transformer sections (202, 206) both having said first angular offset between longitudinal symmetry axes of their cross-sections and said first linear offset of their center axes, wherein each of said transformer sections (202, 206) has one protruded ridge (204, 208) on broad walls, wherein the first ridge (204) is mainly situated outside the cross section of the second transformer section 206 and the second ridge (208) is mainly situated outside the cross section of the first transformer section (202).
摘要:
In a bandstop filter having an input port (2; 3), an output port (3; 2) and a waveguide (1, 1′) connecting the two ports, at least one resonator body (4, 5; 4′ 5) is located in the waveguide (1, 1′), which resonator body has resonance frequency above the limit frequency of the waveguide (1; 1′).
摘要:
A waveguide adapter is arranged between a rectangular waveguide with a single cross-section and an elliptical waveguide which allows for the propagation of a fundamental wave type and higher wave types. The adapter includes a longitudinal channel which allows for the propagation of higher types of waves at least on one part of the length thereof and consists of various stages with different cross-sections. The adapter also has waveguide gates which are used to couple higher waves of the elliptical waveguide. The stages of the waveguide adapter in which the higher wave types are propagated have an elliptical cross-section.
摘要:
The present invention relates to a transition arrangement comprising two surface-mountable waveguide parts and a dielectric carrier material with a metallization and a ground plane provided on a respective first main side and second main side Surface-mountable waveguide parts comprise a first wall, a second wall, and a third wall, which second and third walls are arranged to contact a part of the metallization, all the walls together essentially forming a U-shape, the surface-mountable waveguide parts also comprising respective bend parts. The metallization on the first main side is removed such that a first aperture and a second aperture are formed, the apertures being enclosed by a frame of via holes electrically connecting the ground plane with the metallization, the bend parts being fitted such that the apertures permit passage of a microwave signal propagating via the bend parts. Then the dielectric carrier material itself acts as a waveguide transition between the first aperture and the second aperture.
摘要:
A junction (100) for connecting two waveguides (102, 104) having a first angular offset (α) between longitudinal symmetry axes of their cross-sections, said junction (100) comprising a first interface and a second interlace for connecting said waveguides (102, 104). The junction further comprises at least a first transformer section (106) and a second transformer section (108), both having cross-sections of substantially rectangular shape, and both having said first angular offset (α) between longitudinal symmetry axes of their cross-sections. Each of said transformer sections (106, 108) has two protruded ridges (202, 204, 206, 208) on its opposite walls.