CN113328253B

CN113328253B - double-L-shaped negative group time delay microwave circuit based on asymmetric coplanar strip line

Info

Publication number: CN113328253B
Application number: CN202110546670.3A
Authority: CN
Inventors: 王钟葆; 白羽; 孟雨薇; 赵世朋; 刘宏梅; 房少军
Original assignee: Dalian Maritime University
Current assignee: Dalian Maritime University
Priority date: 2021-05-19
Filing date: 2021-05-19
Publication date: 2022-07-12
Anticipated expiration: 2041-05-19
Also published as: CN113328253A

Abstract

The invention discloses a double-L-shaped negative group time delay microwave circuit based on an asymmetric coplanar strip line, which comprises the following specific steps: the device comprises double L-shaped patches, a dielectric plate, a metal floor, a gap, a patch connecting column, a grounding column combination, an input connector and an output connector; the double-L-shaped patch comprises an L-shaped patch I and an L-shaped patch II, wherein the L-shaped patch I is positioned on the upper surface of the dielectric slab, and the L-shaped patch II is positioned on the lower surface of the dielectric slab; the metal floor comprises a metal floor I and a metal floor II, wherein the metal floor I is located on the upper surface of the dielectric slab, and the metal floor II is located on the lower surface of the dielectric slab. The novel microwave circuit realizes the negative group time delay characteristic and has the characteristics of small insertion loss, simple circuit structure, small size and the like.

Description

double-L-shaped negative group time delay microwave circuit based on asymmetric coplanar strip line

Technical Field

The invention relates to a microwave circuit, in particular to a double-L-shaped negative group time delay microwave circuit based on an asymmetric coplanar strip line.

Background

Group delay distortion is one of the challenging problems in a circuit or a system, which introduces intersymbol interference to distort a signal, so that a delay equalization technology based on a negative group delay microwave circuit is developed, and more researchers develop researches on a high-performance negative group delay microwave circuit. In communication systems, the linearity of the amplifier is an important indicator that affects the performance of the system. The problem of linearity is relatively easy due to the presence of the feed-forward amplifier, but the disadvantage is that the volume of the delay line used is too large, which directly affects the improvement of the integration degree of the whole system, and the problem can be effectively solved by replacing the delay line with a negative group delay microwave circuit. In a wideband navigation system, distortion of the group delay causes distortion of the correlation peak, and the distortion of the correlation peak causes difficulty in determining the true position of the main peak of the correlation peak by the correlator, i.e. the center of the sampling point of the correlator may not be the true time of arrival of the signal, thereby causing the ranging deviation. Eliminating group delay deviation or reducing the influence of the group delay deviation on distance measurement is a technical problem that high-precision navigation is realized and cannot be avoided. The negative group delay microwave circuit can balance the group delay characteristic, and further improve the positioning precision of the broadband satellite navigation system.

Most of traditional negative group time delay microwave circuits are realized based on RLC lossy resonators, have the defect of large insertion loss, and need to be realized by lumped elements, and the lumped elements usually have some standard values, so that the flexibility of design is limited. In recent years, researchers have proposed a negative group delay circuit based on a lossy transmission line and a cross-coupled circuit based on a finite quality factor resonator, but both the lossy transmission line theory and the cross-coupled theory are very complicated and have great design difficulty. In addition, the negative group delay circuits can be realized only by adopting FR4 board with large dielectric loss, so that the application is limited. In view of the above, it is necessary to provide a double L-shaped negative group delay microwave circuit based on an asymmetric coplanar strip line, which has a simple structure and low insertion loss and is implemented without using FR4 board.

Disclosure of Invention

According to the problems in the prior art, the invention discloses a double-L-shaped negative group time delay microwave circuit based on an asymmetric coplanar strip line, which comprises the following specific steps: the device comprises double L-shaped patches, a dielectric plate, a metal floor, a gap, a patch connecting column, a grounding column combination, an input connector and an output connector;

the double-L-shaped patch comprises an L-shaped patch I and an L-shaped patch II, wherein the L-shaped patch I is positioned on the upper surface of the dielectric slab, and the L-shaped patch II is positioned on the lower surface of the dielectric slab;

the metal floor comprises a metal floor I and a metal floor II, wherein the metal floor I is positioned on the upper surface of the dielectric plate, and the metal floor II is positioned on the lower surface of the dielectric plate;

the gap comprises a gap I and a gap II; the gap I is arranged between the L-shaped patch I and the metal floor I; the gap II is arranged between the L-shaped patch II and the metal floor II;

the L-shaped patch I and the L-shaped patch II are connected together through a patch connecting column; the metal floor I and the metal floor II are connected together through a grounding column combination;

the inner conductor of the input connector is connected with the L-shaped patch I, and the outer conductor of the input connector is connected with the metal floor I; and the inner conductor of the output connector is connected with the L-shaped patch II, and the outer conductor of the output connector is connected with the metal floor II.

Due to the adoption of the technical scheme, the double-L-shaped negative group time delay microwave circuit based on the asymmetric coplanar strip line, provided by the invention, has the advantages that the problems of overlarge insertion loss, complex circuit and the like are solved while the circuit structure realizes the negative group time delay microwave circuit, so that the negative group time delay characteristic can be realized by the microwave circuit without adopting an FR4 board, and the double-L-shaped negative group time delay microwave circuit has the characteristics of small insertion loss, simple circuit structure, small size and the like.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural diagram of a double L-shaped negative group delay microwave circuit based on an asymmetric coplanar strip line according to the present invention;

FIG. 2 is a top view of the double L-shaped negative group delay microwave circuit based on the asymmetric coplanar strip line according to the present invention;

FIG. 3 is a side view of the double L-shaped negative group delay microwave circuit based on the asymmetric coplanar strip line of the present invention;

FIG. 4 is a group delay curve diagram of the double L-shaped negative group delay microwave circuit based on the asymmetric coplanar strip line;

FIG. 5 is an S parameter amplitude curve diagram of the double L-shaped negative group delay microwave circuit based on the asymmetric coplanar strip line.

Detailed Description

In order to make the technical solutions and advantages of the present invention clearer, the following makes a clear and complete description of the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention:

as shown in fig. 1-3, the double L-shaped negative group delay microwave circuit based on the asymmetric coplanar strip line specifically includes a double L-shaped patch 1, a dielectric plate 2, a metal floor 3, a gap 4, a patch connection post 5, a ground post assembly 6, an input connector 7 and an output connector 8;

the double-L-shaped patch 1 comprises an L-shaped patch I11 and an L-shaped patch II 12, wherein the L-shaped patch I11 is positioned on the upper surface of the dielectric plate 2, and the L-shaped patch II 12 is positioned on the lower surface of the dielectric plate 2;

the metal floor 3 comprises a metal floor I31 and a metal floor II 32, the metal floor I31 is positioned on the upper surface of the dielectric plate 2, and the metal floor II 32 is positioned on the lower surface of the dielectric plate 2;

the gap 4 comprises a gap I41 and a gap II 42; the gap I41 is arranged between the L-shaped patch I11 and the metal floor I31; the gap II 42 is arranged between the L-shaped patch II 12 and the metal floor II 32;

the L-shaped patch I11 and the L-shaped patch II 12 are connected together through a patch connecting column 5; the metal floor I31 and the metal floor II 32 are connected together through a grounding column assembly 6;

the inner conductor of the input connector 7 is connected with the L-shaped patch I11, and the outer conductor of the input connector is connected with the metal floor I31; the inner conductor of the output connector 8 is connected with the L-shaped patch II 12, and the outer conductor is connected with the metal floor II 32.

In order to further explain the double L-shaped negative group delay microwave circuit based on the asymmetric coplanar strip line provided by the present invention, the following detailed description is given on the specific example implemented on the premise of the technical solution of the present invention, but the protection scope of the present invention is not limited to the following examples, and the methods used in the following examples are all conventional methods unless otherwise specified.

Specific examples are as follows: this example illustrates a double L-shaped negative group delay microwave circuit based on an asymmetric coplanar strip line, where the center operating frequency is 1.575 GHz. As shown in fig. 4, the group delay value of the double L-shaped negative group delay microwave circuit based on the asymmetric coplanar stripline of the present invention at the operating frequency of 1.575GHz is-2.25 ns, and the group delay values are negative values within the frequency range of 1.557GHz to 1.598 GHz. As shown in fig. 5, the insertion loss of the double L-shaped negative group delay microwave circuit based on the asymmetric coplanar strip line is less than 4.2dB in the negative group delay operating frequency range, and the return loss of the input/output port is greater than 10.6 dB. The double-L-shaped negative group delay microwave circuit based on the asymmetric coplanar strip line can realize the negative group delay characteristic, is low in insertion loss and has a good port matching characteristic.

In summary, the asymmetric coplanar strip line-based double-L-shaped negative group delay microwave circuit of the present invention realizes the negative group delay characteristic, has the characteristics of small insertion loss, simple circuit structure, small size, etc., and is very suitable for being applied to various radio frequency microwave systems. The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.

Claims

1. The utility model provides a two L type negative group time delay microwave circuit based on asymmetric coplanar strip line which characterized in that: the device comprises a double-L-shaped patch (1), a dielectric plate (2), a metal floor (3), a gap (4), a patch connecting column (5), a grounding column combination (6), an input connector (7) and an output connector (8);

the double-L-shaped patch (1) comprises an L-shaped patch I (11) and an L-shaped patch II (12), wherein the L-shaped patch I (11) is positioned on the upper surface of the dielectric slab (2), and the L-shaped patch II (12) is positioned on the lower surface of the dielectric slab (2);

the metal floor (3) comprises a metal floor I (31) and a metal floor II (32), wherein the metal floor I (31) is positioned on the upper surface of the dielectric plate (2), and the metal floor II (32) is positioned on the lower surface of the dielectric plate (2);

the gap (4) comprises a gap I (41) and a gap II (42); the gap I (41) is arranged between the L-shaped patch I (11) and the metal floor I (31); the gap II (42) is arranged between the L-shaped patch II (12) and the metal floor II (32);

the L-shaped patch I (11) and the L-shaped patch II (12) are connected together through a patch connecting column (5); the metal floor I (31) and the metal floor II (32) are connected together through a grounding column combination (6);

the inner conductor of the input connector (7) is connected with the L-shaped patch I (11), and the outer conductor is connected with the metal floor I (31); the inner conductor of the output connector (8) is connected with the L-shaped patch II (12), and the outer conductor is connected with the metal floor II (32).