CN112953402A - 5G millimeter wave Doherty power amplifier based on super surface - Google Patents
5G millimeter wave Doherty power amplifier based on super surface Download PDFInfo
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- CN112953402A CN112953402A CN202110304219.0A CN202110304219A CN112953402A CN 112953402 A CN112953402 A CN 112953402A CN 202110304219 A CN202110304219 A CN 202110304219A CN 112953402 A CN112953402 A CN 112953402A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/04—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers
- H03F1/06—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers to raise the efficiency of amplifying modulated radio frequency waves; to raise the efficiency of amplifiers acting also as modulators
- H03F1/07—Doherty-type amplifiers
Abstract
The invention relates to a 5G millimeter wave Doherty power amplifier based on a super surface, and belongs to the field of microwave circuit design. The power amplifier comprises a power divider, a main power amplifier module, an auxiliary power amplifier module, a 90-degree phase shift line and a phase shift module; the phase shift module is composed of a feed source antenna and a super-surface electromagnetic focusing lens array; the input ends of the main power amplifier module and the auxiliary power amplifier module are connected with the total input end of the power amplifier through a power divider; the output end of the main power amplification module is compensated by the phase shift module and then synthesized with the output end of the auxiliary power amplification module to form a total output. The invention realizes 90-degree phase shift in a wider frequency band by adjusting the unit structure of the super-surface electromagnetic focusing lens, realizes load impedance modulation, and has the advantages of simple processing, compact structure and easy processing and integration.
Description
Technical Field
The invention belongs to the field of microwave circuit design, and relates to a super-surface-based 5G millimeter wave Doherty power amplifier.
Background
In the existing 5G communication system, in addition to the improvement of the transmission rate, the communication capacity is also greatly improved, and the wireless communication system also puts more rigorous requirements on the performance index of the communication equipment while developing rapidly. The radio frequency power amplifier is one of the most core devices in a wireless transmitter, and the function of the radio frequency power amplifier is mainly to radiate an input weak radio frequency signal into a free space through an antenna after the input weak radio frequency signal is subjected to distortion-free amplification. The indexes of the radio frequency power amplifier such as output power, linearity, efficiency and working bandwidth have direct influence on the performance of the whole transmitter. DPA was first proposed in 1936 by the Doherty W H of bell laboratories in the united states, and has been widely used in mobile communication systems using high peak-to-average ratio modulation signals due to its characteristic of maintaining high efficiency within a certain power back-off range. In the next generation mobile communication system, the multimode multiband communication mode requires a transmitter and a power amplifier to have a sufficiently wide bandwidth and high efficiency. At the same time, the bandwidth of the signal will also be widened, even to 100MHz or higher. Thus, the problems of high efficiency, wide bandwidth, and good linearity have been the focus of power amplifier design. In the Doherty power amplifier design, a quarter-wavelength conversion line in a load impedance modulation network has a great inhibition effect on the bandwidth, and because the impedance conversion of the quarter-wavelength line is large, the load modulation range is small, and the other frequency bands have a detuning phenomenon.
The super surface is a plane structure formed by periodically distributed unit structures arranged according to a specific rule. Has the characteristics that natural substances do not have. The wave front of the electromagnetic wave is controlled by introducing a sudden change phase, so that the amplitude and the phase of the electromagnetic wave are regulated and controlled. Wherein the super-surface focusing lens: the planar optical device is a planar optical device with the super surface having the most application prospect in the field of practical application, and the phase and amplitude changes of the transmitted electromagnetic waves can be controlled by changing the shape of the unit structure. The super-surface focusing lens is a planar optical device with super-surface having application prospect in the field of practical application.
With the continuous requirements of the wireless communication system on the adjustability and the miniaturization of the system, the broadband Doherty power amplifier realized by adopting the super-surface electromagnetic focusing lens technology with compact structure and size has wide practical value.
Disclosure of Invention
In view of the above, the present invention provides a super-surface based 5G millimeter wave Doherty power amplifier, which uses a structure of a super-surface electromagnetic focusing lens with a compact structure size to replace a quarter-wavelength transformation line in a conventional Doherty amplifier, and implements a 90-degree phase shift of main power amplifier output in a wider frequency band, thereby implementing load impedance modulation and improving the overall bandwidth; and the structure can be miniaturized.
In order to achieve the purpose, the invention provides the following technical scheme:
A5G millimeter wave Doherty power amplifier based on a super surface comprises a power divider, a main power amplifier module 1, an auxiliary power amplifier module 2, a 90-degree phase shift line and a phase shift module 3; the phase shift module 3 comprises a feed source antenna and a super-surface electromagnetic focusing lens array;
the input ends of the main power amplifier module 1 and the auxiliary power amplifier module 2 are connected with the total input end of the power amplifier through a power divider; the output end of the main power amplifier module 1 is compensated by the phase shift module 3 and then synthesized with the output end of the auxiliary power amplifier module 2 to form a total output.
Further, the super-surface electromagnetic focusing lens array is composed of a single layer of lens units which are periodically arranged.
Furthermore, the single-layer lens unit is composed of two U-shaped frames and a T-shaped structure, wherein the two U-shaped frames and the T-shaped structure are formed by microstrip lines.
Furthermore, the feed source antenna adopts a microstrip antenna structure.
Furthermore, the feed source antenna is in an inverted 'mountain' shape.
Furthermore, the antennas in the main power amplifier module 1, the auxiliary power amplifier module 2 and the phase shift module 3 are laid on the dielectric substrate in a patch form.
The invention has the beneficial effects that:
1) the invention adopts the structure of the super-surface electromagnetic focusing lens with compact structure size to replace a quarter-wavelength transformation line in a traditional Doherty amplifier, realizes 90-degree phase shift of main power amplifier output in a wider frequency band, realizes load impedance modulation and improves the whole bandwidth.
2) The invention realizes the miniaturization of the structure, has small volume, is easy to integrate with other microwave circuits, and has strong practicability and application prospect.
3) The super-surface electromagnetic focusing lens adopted by the invention has a simple structure, is easy to process, and is convenient to integrate with other planar circuits.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of a 5G millimeter wave Doherty power amplifier of the present invention;
FIG. 2 is a schematic diagram of a phase shift module;
FIG. 3 is a schematic diagram of a feed antenna in a phase shift module;
FIG. 4 is a schematic diagram of an electromagnetic focusing lens array;
FIG. 5 is a top view of a single layer lens cell;
FIG. 6 is a side view of a single layer lens unit;
reference numerals: 1-main power amplifier module, 2-auxiliary power amplifier module and 3-phase shift module.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 6, a super-surface based 5G millimeter wave doherty power amplifier is preferred in the embodiment of the present invention, as shown in fig. 1, the power amplifier includes: the main power amplifier module 1 and the auxiliary power amplifier module 2 are connected in parallel, and the input end and the output end of the main power amplifier module 1 and the auxiliary power amplifier module 2 are respectively connected with the total input end and the total output end of the Doherty power amplifier in a corresponding circuit manner; and a phase shift module 3 is connected in series between the output end of the main power amplifier module 1 and the total output end. The phase shift module 3 can realize 90-degree phase shift in a broadband, and realize a load impedance modulation function.
The phase shift module is composed of an electromagnetic focusing lens formed by a super surface, the electromagnetic focusing lens is used for orderly arranging units with different sizes according to a phase gradient theory and a holographic theory, flexible regulation and control of the phase of a main power amplifier signal can be achieved, and the working bandwidth of the amplifier is improved.
The patch antennas in the main power amplifier module 1, the auxiliary power amplifier module 2 and the phase shift module 3 in this embodiment are laid on a dielectric substrate, the dielectric substrate adopts Rogers 4350 medium, the thickness is 0.254mm, and the relative dielectric constant epsilonrIn the range of 2 to 5 (e.g., 3.48); loss tangent tg sigma less than or equal to10-3. The super-surface electromagnetic focusing lens adopts a single-layer lens array structure, the dielectric substrate adopts F4B, and the thickness is 1 mm.
As shown in fig. 2, the phase shift module 3 is composed of a feed antenna and a super-surface electromagnetic focusing lens array. The feed source antenna adopts a microstrip antenna structure. The super-surface electromagnetic focusing lens array is composed of a single layer of lens units which are periodically arranged.
As shown in fig. 3, the feed antenna adopts a patch antenna structure (inverted "mountain" shape). When the central frequency is 24GHz, the initial values of the parameters of the patch antenna are respectively W through simulation determination1＝5.485mm，L1＝3.486mm，g1＝0.66mm，d10.9mm, feeder width g2＝0.38mm。
As shown in fig. 4 to 6, the schematic diagrams of the electromagnetic focusing lens array and the schematic diagram of the adopted single-layer lens unit structure are shown, the unit structure is composed of two U-shaped frames and a T-shaped structure which are formed by microstrip lines, and the unit structure can be equivalent to a multi-stage L, C resonant circuit. At a center frequency of 24GHz, initial values of the structural parameters of the single-layer lens unit are determined by simulation to be p-4 mm, w-0.2 mm, g-0.1 mm and l respectively under the condition that the transmittance of the lens array is ensured to be more than 70 percent1＝0.4mm，l2＝2.5mm，l31mm, and the thickness h of the substrate dielectric layer is 1 mm. The unit structure can realize 90-degree phase shift at 24GHz-26GHz by periodic arrangement.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (6)
1. A5G millimeter wave Doherty power amplifier based on a super surface comprises a power divider, a main power amplifier module (1), an auxiliary power amplifier module (2) and a 90-degree phase shift line, and is characterized by further comprising a phase shift module (3); the phase shift module (3) comprises a feed source antenna and a super-surface electromagnetic focusing lens array;
the input ends of the main power amplifier module (1) and the auxiliary power amplifier module (2) are connected with the total input end of the power amplifier through a power divider; the output end of the main power amplifier module (1) is compensated by the phase shift module (3) and then synthesized with the output end of the auxiliary power amplifier module (2) to form a total output.
2. The super-surface based 5G millimeter wave Doherty power amplifier of claim 1, wherein the super-surface electromagnetic focusing lens array is composed of a single layer of lens cells arranged periodically.
3. The super-surface based 5G millimeter wave Doherty power amplifier according to claim 2, wherein the single-layer lens unit is composed of two U-shaped frames and a T-shaped structure which are formed by microstrip lines.
4. The super-surface based 5G millimeter wave Doherty power amplifier of claim 1, wherein the feed antenna adopts a microstrip antenna structure.
5. The super-surface 5G millimeter wave Doherty power amplifier according to claim 4, wherein the feed antenna is in the shape of an inverted chevron.
6. The super-surface-based 5G millimeter wave Doherty power amplifier according to claim 1, wherein the antennas in the main power amplifier module (1), the auxiliary power amplifier module (2) and the phase shift module (3) are laid on a dielectric substrate in a patch form.
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| CN202110304219.0A CN112953402A (en) | 2021-03-22 | 2021-03-22 | 5G millimeter wave Doherty power amplifier based on super surface |
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| CN202110304219.0A CN112953402A (en) | 2021-03-22 | 2021-03-22 | 5G millimeter wave Doherty power amplifier based on super surface |
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Citations (5)
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|---|---|---|---|---|
| CN103368655A (en) * | 2013-06-21 | 2013-10-23 | 哈尔滨工业大学深圳研究生院 | Telescope array optical signal reception method and telescope array optical signal reception device based on self-adaptation control |
| CN106656054A (en) * | 2016-10-14 | 2017-05-10 | 重庆邮电大学 | High-linearity Doherty power amplifier based on active non-Forster circuit |
| CN107222173A (en) * | 2017-05-12 | 2017-09-29 | 清华大学 | Millimeter wave double frequency Doherty power amplifier based on single-frequency line |
| CN110620603A (en) * | 2018-06-19 | 2019-12-27 | 三星电子株式会社 | Electronic device including a plurality of switches selectively connecting an antenna having a plurality of feed terminals and a communication circuit, and driving method thereof |
| CN110718752A (en) * | 2019-12-12 | 2020-01-21 | 电子科技大学 | Ultra-wideband strong coupling lens antenna based on transceiving structure form |
-
2021
- 2021-03-22 CN CN202110304219.0A patent/CN112953402A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368655A (en) * | 2013-06-21 | 2013-10-23 | 哈尔滨工业大学深圳研究生院 | Telescope array optical signal reception method and telescope array optical signal reception device based on self-adaptation control |
| CN106656054A (en) * | 2016-10-14 | 2017-05-10 | 重庆邮电大学 | High-linearity Doherty power amplifier based on active non-Forster circuit |
| CN107222173A (en) * | 2017-05-12 | 2017-09-29 | 清华大学 | Millimeter wave double frequency Doherty power amplifier based on single-frequency line |
| CN110620603A (en) * | 2018-06-19 | 2019-12-27 | 三星电子株式会社 | Electronic device including a plurality of switches selectively connecting an antenna having a plurality of feed terminals and a communication circuit, and driving method thereof |
| CN110718752A (en) * | 2019-12-12 | 2020-01-21 | 电子科技大学 | Ultra-wideband strong coupling lens antenna based on transceiving structure form |
Non-Patent Citations (1)
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| 赵世巍等: "基于外场调制的方向图可控天线", 《压电与声光》 * |
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