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Coaxial high-power low-pass filtering-impedance converter

A technology of impedance converter and low-pass filter, which is applied in the direction of impedance converter and multi-terminal pair network, etc., can solve the problems of poor stop band characteristics, achieve lower insertion loss, simplify the RF output system, and achieve low-pass amplitude-frequency characteristics Effect

Inactive Publication Date: 2007-10-17
鞍山同方吉兆广播电视设备有限公司
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Problems solved by technology

[0002] Impedance converters are widely used in wireless communication transmission equipment and antennas, and are a key technology for designing high-power multi-channel RF synthesizers. Usually, impedance converters complete two different impedance Z L to Z H Transform (Z L H ), impedance ratio r=Z H / Z L >1; in the transmitter n-way synthesizer (n is a positive integer), usually Z H = 50Ω, Z L =112.5 / n; the main function of the common impedance converter is impedance transformation, even if it has low-pass amplitude-frequency characteristics, but its stop-band characteristics are poor, so it is usually necessary to use a low-pass filter in the transmitter

Method used

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Embodiment Construction

[0017] The present invention will be described in further detail below in conjunction with accompanying drawing:

[0018] We need to design an 8-channel synthesizer used in an FM broadcast transmitter, the operating frequency range is 88-108MHz, the schematic block diagram is shown in Figure 3, and the power capacity is > 10KW; the function that needs to be completed by the impedance converter is: to convert the impedance Z L = 14.06Ω transformed to Z H =50Ω, and the ability to suppress the second and above harmonics exceeds 35dB. We can do this by:

[0019] The coaxial structure shown in Figure 1 is adopted, the outer conductor M1 is a copper tube with an outer diameter of 79.4mm, the inner conductors T1~T8 are made of copper or aluminum, and the insulating support sheets E1~E4 are made of polytetrafluoroethylene. ε r =2.1; Adjacent inner conductors are connected by "threaded connection", such as T1 and T2, T2 and T3, T3 and T4...etc. in the figure.

[0020] Transmission ...

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Abstract

The present invention relates to a coaxial big-power low-pass filtering- impedance converter which is characterized in that: the device has a coaxial structure formed by the inner and outer conductor and the insulated supporting plate, and the inner and outer conductor and the medium between then form the high and low impedance transmitting line; the high and low impedance transmitting lines are arranged at intervals, and the an insulated supporting plate is positioned between the inner and outer conductor of the low impedance transmitting line; the adjacent conductors are connected by screws. The advantages of the present invention reside in: a wider working frequency band and a bandwidth>=30% are provided; the device has a performance of lowpass amplitude-frequency and the secondary or more harmonic wave can be restrained effectively in the system; the output lowpass wave of the transmitter can be saved by using the device in the present invention to replace the impedance convertor in the multiway synthesizer and the inserted consumption of the RF output system is reduced, thus, the output system of the transmitter RF is simplified and the cost is also reduced.

Description

technical field [0001] The invention relates to an impedance converter in the technical field of wireless communication, in particular to a coaxial high-power low-pass filter-impedance converter. Background technique [0002] Impedance converters are widely used in wireless communication transmission equipment and antennas, and are a key technology for designing high-power multi-channel RF synthesizers. Usually, impedance converters complete two different impedance Z L to Z H Transform (Z L <Z H ), impedance ratio r=Z H / Z L >1; in the transmitter n-way synthesizer (n is a positive integer), usually Z H = 50Ω, Z L =112.5 / n; the main function of the common impedance converter is impedance transformation, even if it has low-pass amplitude-frequency characteristics, but its stop-band characteristics are poor, so it is usually necessary to use a low-pass filter in the transmitter. Contents of the inventi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H11/40
Inventor 丛金涛吕卫么国静董振刚
Owner 鞍山同方吉兆广播电视设备有限公司
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