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Cavity Device and Its Elliptic Function Low-pass Filter

A low-pass filter and elliptic function technology, applied in the field of signal splitting and combining, to achieve the effects of low insertion loss, increased stability, and simple port design

Active Publication Date: 2017-11-28
COMBA TELECOM TECH (GUANGZHOU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical applications, a low-pass filter with better electrical performance is required, and the above-mentioned low-pass filter still does not meet the requirements

Method used

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  • Cavity Device and Its Elliptic Function Low-pass Filter
  • Cavity Device and Its Elliptic Function Low-pass Filter
  • Cavity Device and Its Elliptic Function Low-pass Filter

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Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] A traditional low-pass filter consists of a resistor connected in series with the load and a capacitor connected in parallel with the load. The capacitor has a reactance effect, which prevents high-frequency signals from passing through on the one hand, and allows low-frequency signals to pass through the load on the other hand. The reactance effect is weakened at high frequencies, so the capacitor also acts as a short circuit. refer to figure 1 , the elliptic function type low-pass filter of the present invention is based on the traditional low-pass filter, and its low impedance part is replaced by a resonant unit connected in series with an equivalent inductance and capacitance, thereby forming a number of transmission zeros outside the passband, improving The center frequency near-end out-of-band rejection performance of th...

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Abstract

The invention relates to an elliptic function type low-pass filter, which comprises a longitudinal cavity body and a cover plate which are covered with each other. The two ends of the cavity body along the longitudinal direction are provided with two ports for external signal connection. A transmission rod for conducting signals between the two ports is provided in the cavity, and a number of resonant units are spaced above the transmission rod along its longitudinal direction, wherein the resonant unit includes an inductance element formed by twisting a wire and a dielectric plate printed with a tuning disc, the dielectric plate is arranged across the top of the elongated cavity, one end of the inductance element is in contact with the tuning disc of the dielectric plate, and the other end is connected to the The transmission rod contacts the connection. Furthermore, it relates to a cavity device, which adopts the aforementioned elliptic function type low-pass filter. The invention has the advantages of small insertion loss, high out-of-band suppression, wide suppression frequency band, good intermodulation suppression and the like.

Description

technical field [0001] The invention relates to a signal splitting and combining technology, in particular to a cavity device and an elliptic function type low-pass filter thereof. Background technique [0002] In the prior art, such as the GSM / DCS / WCDMA three-frequency combiner described in the Chinese invention patent publication number CN101335905A, the three-frequency combiner is used to complete three different frequency band signals of high-frequency signals GSM, DCS and WCDMA Combined processing, each signal path is realized by a band-pass filter, wherein the DCS and WCDMA band-pass filters of the combiner share a resonant column near the combined port, and the GSM band-pass filter is composed of a metal The conduction band is electrically connected to the channel port where it is located, so as to realize the combined output of the three frequency bands. Although the combiner provided by this invention can well realize the combination between ultra-wide frequency ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/20H01P1/203H01P1/213
Inventor 夏功想邸英杰陈凯昌敏华王园波
Owner COMBA TELECOM TECH (GUANGZHOU) CO LTD
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