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Transmission line transformer with non-integer square transformation ratio

A technology of transmission line transformers and transformers, which is applied in the direction of transformers, transformer/inductor parts, transformer/inductor coils/windings/connections, etc. It can solve the problems of large volume, unsuitable miniaturization, high loss, etc., and achieve compact structure, Change flexibly and solve the effect of high loss

Pending Publication Date: 2022-05-10
KUSN JIUHUA ELECTRONICS EQUIP FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The main purpose of the present invention is to provide a transmission line transformer with a non-integer square ratio, which overcomes the shortcomings of the non-integer square ratio transmission line transformer in the short-wave frequency band, which are bulky, unsuitable for miniaturization, and high loss

Method used

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  • Transmission line transformer with non-integer square transformation ratio

Examples

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Effect test

Embodiment 1

[0062] This embodiment is a transmission line transformer with a non-integer square transformation ratio, such as Figure 7 shown, which includes an impedance ratio of 1:N 2 (N is an integer greater than or equal to 2) winding type transformer T1 and a guarnera type transformer T2 with an impedance transformation ratio of 4:1. The low-impedance port 11 of T1 is connected in parallel with the high-impedance port 21 of the transformer T2. After parallel connection, the external low-impedance terminal a and the external low-impedance terminal b of the non-integer square ratio transformer are formed, and the external low-impedance terminal a and the external low-impedance terminal b are formed. An external low-impedance port is formed between the two. The high-impedance port 12 of T1 is connected in series with the low-impedance port 22 of T2, and the non-integer square transformation ratio transformer is connected in series to form a total external high-impedance terminal c and ...

Embodiment 2

[0087] This embodiment has a transmission line transformer with a non-integer square ratio, and its structure is as follows Figure 14 shown, which includes an impedance ratio of 1:N 2 A winding transformer T1 and a guarnera transformer T2 with an impedance ratio of 4:1. It is basically similar to the first solution in the first embodiment, but the difference between the two is that a section of independent wire 623 is added in the guarnera transformer T2. At the high-impedance port of T2, one end 6231 of the independent conductor 623 is connected to the high-impedance terminal k of T2; at the low-impedance port of T2, the other end 6232 of the independent conductor 623 is connected to the arc section 516 of the "U" shaped cable cluster, and then grounded. Other structures and connections in this embodiment are the same as the first solution in Embodiment 1, and the impedance transformation ratio is also the same. The addition of the independent wire 623 will improve the ba...

Embodiment 3

[0090] The transmission line transformer with a non-integer square transformation ratio in this embodiment has the same principle, structure and connection relationship as the second solution in Embodiment 1, the difference is that this embodiment also has the following Figure 15 As shown in the magnetic core 71, the magnetic core has a cuboid structure, and there are two through rectangular holes 711 and 712 at the lower part of the middle. The tops of the rectangular holes 711 and 712 are provided with circular holes 713 and 714, and all the circular holes run through the entire magnetic core. Core 71. The third embodiment is composed of a winding transformer T1 and a Guarana transformer T2, such as Figure 16 shown. Among them, the "U"-shaped cable cluster of the winding transformer T1, the first straight coaxial cable 512 and the second straight coaxial cable 513 are respectively installed in the two rectangular holes 711 and 712, and the straight coaxial cable 513 of th...

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Abstract

The invention discloses a transmission line transformer with a non-integer square transformation ratio, which comprises a winding type transformer T1 with an impedance transformation ratio of 1: N2 and a melon inner pull type transformer T2 with an impedance transformation ratio of 4: 1, and N is an integer greater than or equal to 2; each of the winding type transformer T1 and the melon inner pull type transformer T2 is provided with a low-impedance port and a high-impedance port; a low-impedance port of the winding type transformer T1 is connected in parallel with a high-impedance port of the melon inner pull type transformer T2, and a total external low-impedance port of the transmission line transformer is formed after the parallel connection of the low-impedance port of the winding type transformer T1 and the high-impedance port of the melon inner pull type transformer T2; a high-impedance port of the winding type transformer T1 is connected in series with a low-impedance port of the melon inner pull type transformer T2, and a total external high-impedance port of the transmission line transformer is formed after series connection. According to the non-integer square impedance transformation ratio transformer, the impedance transformation ratio step pitch is refined, meanwhile, single-end-differential (balanced) impedance conversion can be achieved, the structural size is compact, and impedance transformation ratio switching is flexible.

Description

【Technical field】 [0001] The invention belongs to the technical field of radio frequency circuits, in particular to a transmission line transformer with a non-integer square transformation ratio. 【Background technique】 [0002] Transmission line transformers have the advantages of wide bandwidth, simple structure, and low cost, and are widely used in shortwave and ultrashortwave radio frequency circuits. By selecting the power capacity of the transmission line, a larger power passing capability can be obtained, and it is especially suitable for use as an impedance converter of a high-power power amplifier. [0003] Commonly used transmission transformers include Ruthoff type, Guanella type and winding (Toroid) type, etc., such as Figure 1-Figure 4 shown. The core structure that constitutes the above-mentioned transformer is an RF transmission line, such as a twisted pair or a coaxial line. Generally, the two conductors of the transmission line are of equal length and appe...

Claims

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Application Information

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IPC IPC(8): H01F27/28H01F38/00
CPCH01F27/2828H01F38/00
Inventor 刘宁毋明旗宋福荣蓝之远刘亮
Owner KUSN JIUHUA ELECTRONICS EQUIP FACTORY
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