RU2768530C1 - Broadband symmetrical vibrator in printed design - Google Patents

Abstract

FIELD: antenna technology.

SUBSTANCE: invention relates to antenna technology, in particular to broadband symmetrical vibrators in printed form. The effect is achieved by the fact that a broadband symmetrical printed vibrator, made on a substrate containing a screen, a two-wire symmetrical line forming a short-circuited loop, which is connected to the vibrator arms on the one hand, and to the screen, on the other hand, the supply line, the vibrator arms and supply conductors of a short-circuited loop are located on different sides of the substrate, in this case, the supply line is made in the form of a symmetrical strip line, the inner conductor of which is connected to one of the vibrator arms by means of a jumper, and the screen is installed perpendicular to the substrate, characterized in that a matching printed element is introduced, located on the inner part of the substrate, above the vibrator arms, forming a three-circuit system.

EFFECT: improved transmission line-to-load matching over a wider frequency band.

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Description

The present invention relates to microwave technology (SHF), in particular to antennas, and can be used in broadband transceivers, communications technology, radar devices, and also as part of phased antenna arrays (PAR).

The relevance of the development of such antennas is due to the miniaturization of radio equipment, increasing requirements for broadband systems, as well as requirements for weight and size indicators. Printed vibrator antennas have such properties.

A printed symmetrical vibrator is known, containing symmetrical shoulders and a two-wire supply line (US7324059B2, Stub printed dipole antenna (SPDA) having wide-band and multi-band characteristics and method of designing the same, H01Q9, 19.08.2005). The device is small in size and light in weight.

However, this device uses the design of a two-wire line with an end connection, i.e. the conductors are in the same plane, therefore, this line has high radiation losses and lower noise immunity, as well as a smaller operating frequency range in comparison with the line, the conductors of which are in different planes, on opposite sides of the dielectric (line with face connection). A short-circuited loop formed on a two-wire line has a pronounced reactive component in the frequency band, which makes it difficult to match. The loop on the line with face communication has a smaller reactive component.

A printed symmetrical vibrator for a wireless multi-band communication system (US7095382B2, printed dipole antennas for wireless multi-band communications systems, H01Q9, 11/24/2003) is known, containing a power cable on the reverse side of the antenna, which is connected to the vibrator arm with a jumper. The arms of the vibrator are in the same plane at a height of ¼ wavelength from the screen.

However, this device uses a short-circuited supply quarter-wave loop, made on the basis of a two-wire line with an end connection, which worsens the matching.

A printed symmetrical vibrator is known (A printed dipole antenna for RFID tag, KR200430494Y1, H01Q9, 06/16/2006), containing a printed microstrip balun transformer with a line length equal to ¼ wavelength. The microstrip line of the vibrator is located on one side of the dielectric substrate. The connection of the line with the vibrator is provided by a jumper.

However, this device uses the design of a two-wire line with an end connection, which has large radiation losses, and, consequently, worse matching and a small operating frequency range (bandwidth -15% at VSWR no more than 1.5) in comparison with a line with front connection.

In addition, a printed symmetrical vibrator is known (printed symmetrical vibrator, RU2717573C1, H01Q9, 06/19/2019), which is a prototype of the present invention, made on a substrate containing a screen, a two-wire symmetrical line forming a short-circuited loop, which is connected on one side to the arms of the vibrator, on the other hand, to the screen, the supply line, characterized in that the arms of the vibrator and the supply conductors of the short-circuited loop are located on different sides of the substrate, while the supply line is made in the form of a symmetrical strip line, the inner conductor of which is connected to one of the arms of the vibrator jumper, and the screen is installed perpendicular to the substrate

However, in the prototype device, the use of a short loop based on a two-wire balanced line with face connection, forming a two-loop system, does not provide an insufficiently wide frequency band, which is 28% of the level 2 SWR.

The objective (technical result) of the invention is to improve the matching of the transmission line with the load in a wider frequency band.

The technical result is achieved by the fact that in a well-known symmetrical printed vibrator, made on a substrate containing a screen, a two-wire symmetrical line forming a short-circuited loop, on the one hand, which is connected to the shoulders of the vibrator, on the other hand, to the screen, the supply line, the shoulders of the vibrator and the supply conductors of the short-circuited loop are located on different sides of the substrate, while the supply line is made in the form of a symmetrical strip line, the inner conductor of which is connected to one of the vibrator arms by means of a jumper, and the screen is installed perpendicular to the substrate, while a matching printed element located on the inner part is inserted substrates, above the arms of the vibrator, forming a three-circuit system and allowing you to expand the frequency band up to 42% at a given SWR level of less than 2.

Figure 1 shows the proposed symmetrical vibrator in printed form, figure 2 - frequency dependence of VSWR, figure 3 - figure 4 - antenna pattern in the planes of the vectors of electric and magnetic fields, at the lower and upper frequencies, respectively.

The proposed device (figure 1) placed on the dielectric 1, contains a symmetrical strip line, the outer conductors 2 of which are connected at one end to the shoulders of the vibrator 3, from the other end to the screen 4, while the inner conductor of the symmetrical strip line 5 is connected to one of shoulders of the vibrator 3 by means of a jumper 6, and a matching printed element 7.

Broadband symmetrical vibrator in the printed version works as follows. The microwave signal is fed to the inner conductor of the supply line 5 and through the jumper 6 goes to the first arm of the vibrator, and also, through a quarter-wave short-circuited loop formed by a symmetrical two-wire transmission line with front connection, to the second arm of the vibrator. As a result, a common-mode current flows along the shoulders of the vibrator 3, which is the source of the electromagnetic field. The arms and the quarter-wave short-circuited loop form an equivalent two-loop system. The effect of improving matching is achieved through the use of a matching printed element 7, through which currents flow and an electromagnetic field is induced that acts on the shoulders of the vibrator and the effect of the third circuit is formed. The three-circuit system, when optimally tuned, provides a large bandwidth of operating frequencies.

Comparison of the claimed device with known ones shows that the claimed device has the following distinctive features:

- the matching printed element is located on the inner side of the dielectric (allows you to connect the shoulders of the vibrator of various geometric shapes)

- minimum reactance in a wide frequency band

An example of the implementation of a device for operation in the decimeter wave range: the vibrator arms are made in the form of a dipole (the material thickness is 0.1 mm), the arm length is 36.2 mm, the width of the strip line is 6 mm. Screen size 100x100mm.

The layout of the broadband vibrator has an operating frequency band at the level of VSWR=1.5 of the order of 38% of the average frequency (at the level of VSWR=2 of the order of 43% of the average frequency) (Figure 2). Gain KU=7.6 dB (Figure 3, Figure 4).

Claims (1)

Broadband printed symmetrical vibrator, made on a substrate containing a screen, a two-wire symmetrical line forming a short-circuited loop, which is connected to the vibrator arms on one side, and to the screen on the other, the power line, the vibrator arms and the power conductors of the short-circuited loop are located on different sides of the substrate, while the supply line is made in the form of a symmetrical strip line, the inner conductor of which is connected to one of the arms of the vibrator by means of a jumper, and the screen is installed perpendicular to the substrate, characterized in that a matching printed element is inserted located on the inner part of the substrate, above the arms of the vibrator , forming a three-loop system.

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