Broadband active matching method and matching circuit for electronically small receiving antenna based on negative impedance conversion

A technology for receiving antennas and electrically small antennas, applied in impedance matching networks, multi-terminal pair networks, etc., can solve problems such as complex circuit structures and poor nonlinear performance, and achieve broadband matching, increase antenna gain, and high active antenna buff effect

Inactive Publication Date: 2012-10-24
HARBIN ENG UNIV
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Problems solved by technology

The document "Sussman-Fort, S.E. "Non-Foster vs. active matching of an electrically-small receive antenna" Antennas and Propagation Society International Symposium (APSURSI), pp1–4, 2010", proposed an enhanced Non-Foster ( Negative impedance) matching method can improve the gain and signal-to-noise ratio very well. Compared with the cla

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  • Broadband active matching method and matching circuit for electronically small receiving antenna based on negative impedance conversion
  • Broadband active matching method and matching circuit for electronically small receiving antenna based on negative impedance conversion
  • Broadband active matching method and matching circuit for electronically small receiving antenna based on negative impedance conversion

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Embodiment Construction

[0019] Below in conjunction with the accompanying drawings, the present invention will be described in more detail by taking the negative impedance matching single whip electric small antenna as an example:

[0020] The electric small antenna with negative impedance matching is related to the input impedance of the electric small antenna when designing the negative impedance active circuit. The input impedance of the single whip electric small antenna is as follows:

[0021] The input resistance of a single whip antenna is:

[0022] R r = 40 π 2 h 2 λ 2 - - - ( 1 )

[0023] The input reactance of a single whip antenna is:

[0024] X a = 60 ...

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Abstract

The invention provides broadband active matching method and matching circuit for an electronically small receiving antenna based on negative impedance conversion. An amplifier which is directly connected with a capacitive electronically small antennae is introduced into a negative impedance conversion so as to enable the amplifier to become a negative impedance conversion amplifier, and the negative impedance conversion obtains a negative capacitance on the input end of the amplifier; when an absolute value of the negative capacitance is greater than the input capacitance of the amplifier, the input end of the amplifier obtains equivalent negative capacitance, the equivalent positive capacitance (input by the electronically small antenna) of an electric reactor is counteracted by the negative electricity capacitance, and the input end of an active electric network is provided with an equivalent negative capacitor According to the method and the circuit, the active receiving antenna has a broadband character and has similar gain and similar signal-to-noise performance with an enhancement mode Non-Foster (negative impedance) matching method, but a circuit is relatively simple; and the combination property is good, the amplification and the negative impedance conversion can be realized in the same circuit, and only a positive feedback capacitor is added compared with the classical active receiving antenna.

Description

technical field [0001] The invention relates to a broadband matching method for an electrically small antenna, and also relates to a broadband matching circuit for an electrically small antenna. Background technique [0002] With the miniaturization of radio technology equipment, the requirements for antenna size in small spaces, and the wide frequency band of communication equipment, there is an increasing demand for broadband miniaturized antennas, which makes broadband and miniaturized antennas become a research hotspot at home and abroad. one of the subjects. In order to realize the miniaturization of the antenna, the electrically small antenna is widely used, but the electrically small antenna has the disadvantages of large input reactance and small radiation resistance, so that the passively matched electrically small antenna is limited by the gain bandwidth theory, and cannot achieve broadband and high efficiency. The classic active receiving antenna uses a high inp...

Claims

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Application Information

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IPC IPC(8): H03H11/28
Inventor 李文兴陈瑞龙翟宁李思
Owner HARBIN ENG UNIV
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