High-power harmonic suppression filter based on rectangular waveguide structure

Abstract

The invention discloses a high-power harmonic suppression filter based on a rectangular waveguide structure, and the filter comprises a standard input waveguide, a standard output waveguide, a first harmonic suppression filtering channel, a second harmonic suppression filtering channel, and a metal sheet. The metal sheet is arranged on the middle H surface of the rectangular waveguide. The first harmonic suppression filtering channel and the second harmonic suppression filtering channel are completely the same and are arranged on the two sides of the metal sheet in a mirror symmetry mode. Theharmonic suppression filtering channel is realized by adopting a corrugated waveguide low-pass filtering structure, a tiny slot structure is avoided, the power capacity is improved, and the stop bandbandwidth of the filter is improved through mirror symmetry of the harmonic suppression filtering channel. The central axis of a standard input / output waveguide and the central axis of the harmonic suppression filtering channel are located on the same straight line, a second harmonic suppression waveguide filter which is compact in structure and low in loss is achieved within the frequency range of microwaves and millimeter waves, and the second harmonic suppression waveguide filter can be used in a high-power amplifier.

Description

technical field [0001] The invention relates to the technical field of waveguide filters, in particular to a high-power harmonic suppression filter based on a rectangular waveguide structure. Background technique [0002] Satellite communication has the advantages of large coverage, long communication distance, convenient networking, and no environmental restrictions. It is the main means of medium and long-distance communication. With the increasing demand for data, video, communication and control in satellite communication, the output power requirements of transmitters are also getting higher and higher. In order to increase the output power, the high-power amplifier in the transmitter usually works near the P1dB compression point, or even works in a saturated state. This also means that the amplifier produces relatively large harmonic signals, with the second harmonic being the largest. Due to the high output power of the amplifier, even though the harmonic signal is s...

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Problems solved by technology

The step impedance transformer is used to connect the height-reducing waveguide and the standard waveguide, and the stop band can reach above 55GHz, but since the minimum waveguide gap is only 0.649mm, the power handling capacity is limited

In addition, due to the use of multi-order quarter-wavelength impedance converters, the size of the filter is relatively large

For the problem that the gap is too small to affect the power capacity of the filter, in 2010, people such as I.Arregui of Spain's Navarre Public University Public University of Navarre reported a low-pass filter for Ku band harmonic suppression [I, Arregui ,I,et al.Design method for satellite output multiplexer low-pass filters exhibiting spurious-freefrequency behavior and high-power operation[J].Microwave&Optical Technology Letters,2010,52(8):1724-1728.], using traditional folded waveguide filter The wide stopband performance is achieved by cascading the filter and the sinusoidal perturbation waveguide structure. This method avoids the use of micro-slot structures and effectively improves the power capacity, but the disadvantage is that the cascading of multiple structures makes the filter volume too large

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