Multiplier of left-hand nonlinear transmission line

Abstract

The invention relates to the technical field of microwave circuits, in particular discloses a multiplier of a left-hand nonlinear transmission line based on Schottky diodes, comprising single-sectionor multi-section left-hand nonlinear transmission line units. An equivalent circuit of the left-hand nonlinear transmission line units comprises variable capacitors connected in series and inductors connected in parallel, wherein a variable capacitor is formed by the back-to-back connection of a pair of Schottky diodes, and blocking capacitors in a traditional left-hand nonlinear transmission lineare replaced by back-to-back diodes in a self-biasing structure. The invention increases the working efficiency of the multiplier, improves the microwave characteristics and simplifies the circuit structure.

Description

technical field [0001] The invention relates to the technical field of microwave circuits, in particular to a left-handed nonlinear transmission line frequency multiplier based on Schottky diodes. Background technique [0002] Microwave frequency multipliers are widely used in systems such as communication, radar and measuring instruments. Its main functions can be summarized in the following aspects: 1. Multiply the oscillator with low frequency but stable output frequency to obtain a high-frequency oscillation source with high stability; 2. The highest oscillation frequency of the transistor oscillator cannot reach When required by the system, the ultra-high frequency oscillation source is obtained through the frequency multiplier; 3. Multiple integer multiple frequencies are obtained. [0003] The nonlinear transmission line is a widely used frequency multiplier structure, which has the advantages of simple structure, no additional matching circuit and idle circuit. A t...

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Problems solved by technology

[0006] figure 1 The traditional right-hand nonlinear transmission line shown has the following inherent defects: the equivalent circuit of the right-hand transmission line is a low-pass circuit, so the highest frequency of output harmonics is less than the cut-off frequency of the transmission line, which is limited in high-frequency applications; the low-pass circuit itself cannot suppress the input The fundamental wave signal, and the amplitude of the fundamental wave signal is often much larger than the harmonic signal, in order to obtain the ideal harmonic, it puts forward high requirements on the filter in the system; if a Schottky diode is used as a varactor, a bias circuit is required

However the above figure 2 The left-handed nonlinear transmission line also has the following defects: low frequency multiplication efficiency, taking a single-section transmission line as an example, among the three capacitors, only the variable capacitor in the middle contributes to harmonic generation; large area

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