Coplanar waveguide/slot line type based mini change detector for dielectric property of fluid

A technology of coplanar waveguide and dielectric properties, which is applied in the field of detection devices for small changes in the dielectric properties of fluids, can solve the problems of narrow bandwidth and low sensitivity, achieve the effects of wide frequency bandwidth, high sensitivity, and avoid the problem of multiple solutions

CN106980049AActive Publication Date: 2017-07-25HENAN NORMAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-07-25

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Abstract

The invention discloses a coplanar waveguide / slot line type based mini change detector for a dielectric property of a fluid. The detector comprises two coplanar waveguide-slot line mixed ring couplers, a coplanar waveguide-slot line balun is connected between an input port of the first mixed ring coupler and a first 1 / 4 annular slot line, a sector-shaped radiating surface is loaded in the tail end of a coplanar waveguide transmission line of an isolation port of the first 1 / 4 annular slot line, two balancing ports of the first 1 / 4 annular slot line are in 180-degree anti-phase output, and the tail ends of the balancing ports are connected to coplanar waveguide-slot line back-to-back baluns respectively; an isolation port of a second 1 / 4 annular slot line includes a slot line, a sector-shaped radiating surface is loaded in the tail end of the isolation port of the second 1 / 4 annular slot line, two balancing ports of the second 1 / 4 annular slot line are in same-phase output, and the tail ends of the balancing ports are connected to coplanar waveguide-slot line back-to-back baluns respectively; and the balancing ports of the two mixed ring couplers are connected via a slot line segment, and a microfluid channel is arranged in the slot line segment. The detector is high in sensitivity and wide in bandwidth, and a detection method is simple and easy to integrate.
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Description

technical field

[0001] The invention belongs to the technical field of microwave measurement, and in particular relates to a detection device for small changes in fluid dielectric properties based on coplanar waveguide / slot lines. Background technique

[0002] With the continuous development of microwave technology, the measurement of dielectric properties of substances occupies an important position in the fields of microwave engineering, microwave chemistry and electromagnetic field biomedicine. The traditional measurement of microwave dielectric properties can be divided into resonance method and non-resonance method, and the non-resonance method is relatively simple. Among the non-resonant methods, the transmission-reflection method has been widely used in broadband measurement, and the measurement of the dielectric properties of low-loss materials can achieve high accuracy.

[0003] However, for protein thermal denaturation, single-cell characteristics, microwave chemi...

Examples

Embodiment Construction

[0016] The specific content of the present invention will be described in detail in conjunction with the accompanying drawings. The device for detecting small changes in fluid dielectric properties based on the coplanar waveguide / slot line type of the present invention is as follows: figure 1 As shown, it includes an input port 1 and an output port 2, both of which are coplanar waveguide transmission lines, which include two signal transmission slots 3 and an intermediate conductive band 4; between the input port 1 and the first 1 / 4 annular groove line 5 Connected with a coplanar waveguide-slot line balun 6; the signal is input from the input port 1 of the first hybrid ring coupler, and is divided into the same amplitude when it is transmitted to the 1 / 4 annular slot line 5 through the coplanar waveguide-slot line balun 6 Two signals with opposite phases, very few of these two signals will reach the isolation port 8 of the first hybrid ring coupler, the isolation port 8 adopts...