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Active matching circuit of Loran C receiving antenna

A receiving antenna and matching circuit technology, applied in impedance matching network, multi-terminal pair network, etc., can solve the problem that passive matching network cannot achieve good results, and achieve the effect of overcoming the dependence on grounding conditions and reducing sensitivity

Pending Publication Date: 2022-02-25
XI AN JIAOTONG UNIV
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Problems solved by technology

Therefore, a fixed passive matching network cannot achieve good results when grounding conditions vary

Method used

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  • Active matching circuit of Loran C receiving antenna
  • Active matching circuit of Loran C receiving antenna
  • Active matching circuit of Loran C receiving antenna

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Embodiment Construction

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0030] In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediar...

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Abstract

The invention discloses an active matching circuit of a Loran C receiving antenna. According to the active matching circuit of a Loran C receiving antenna, a non-Foster circuit and a passive matching circuit are adopted, wherein the non-Foster circuit can reduce input reactance of an antenna by changing feedback resistance of an in-phase input end and a reverse input end, sensitivity of the whole circuit to the input reactance of the antenna is reduced by using the two-stage non-Foster circuit, and the input resistance of the circuit is kept to be a positive value; and then input impedance of the antenna can be converted into 50 ohms by using the two-stage passive matching circuit, and the input impedance of the antenna is basically kept stable under the condition that the input reactance of the antenna changes greatly. According to the invention, the non-Foster circuit is combined with the traditional passive matching circuit, so that the antenna can still be well matched with a receiver when grounding conditions change.

Description

technical field [0001] The invention belongs to the technical field of antennas, and in particular relates to an active matching circuit for a Loran-C receiving antenna. Background technique [0002] Loran (Long Range Navigation, Loran) is one of the most widely used land-based radio navigation systems in the world, and the Loran C system is one of the Loran systems. The operating frequency of the Loran C signal is 90KHz-110kHz, which belongs to the long-wave signal, so its signal coverage is very wide and its anti-interference ability is strong. Underwater military communication and satellite / Loran C integrated navigation and other scientific research. The frequency of the Loran-C signal is low and the wavelength is long. The receiving antenna currently used is mainly a 1-3 meter whip antenna. In the Loran-C frequency band, this antenna is an electrically small antenna with extremely low radiation resistance and high reactance , there are disadvantages such as low efficie...

Claims

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Application Information

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IPC IPC(8): H03H11/28
CPCH03H11/28
Inventor 师振盛范源王力谢斌斌
Owner XI AN JIAOTONG UNIV
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