CN-115801082-B - Phase precision debugging method

CN115801082BCN 115801082 BCN115801082 BCN 115801082BCN-115801082-B

Abstract

The invention provides a phase precision debugging method, which comprises the steps of firstly processing a debugging board and a positive template for all LTCC combined substrates respectively, obtaining initial phase precision of a beam forming matrix through the debugging board, designing a positive template surface phase line through the initial phase precision to realize coarse adjustment of the phase precision, then printing the corrected surface phase line on the surface of the positive template, finally changing the path length of a signal through cutting the debugging phase line on the surface of the positive template to further improve the phase precision and realize fine adjustment of the phase precision.

Inventors

WANG JIE
HUANG YONG
WANG XIAO
ZHANG HUIJING
Jin Rulei

Assignees

苏州博海创业微系统有限公司

Dates

Publication Date: 20260512
Application Date: 20220929

Claims (5)

1. The phase precision debugging method is characterized in that all LTCC combined substrates embedded with phase shifters are respectively processed into two blocks at the same time, and the two blocks are respectively defined as a debugging board and a positive sample board; After phase lines with the same shape and length are printed on the surfaces of the debugging plates, the beam forming matrix is manufactured by adopting the debugging plates, wherein the phase lines are obtained by superposing debugging phase lines on conventional phase lines, and the debugging phase lines are more than two line segments connected with the tail ends of the conventional phase lines in parallel; Testing a beam forming matrix to obtain initial phase precision from each beam to each corresponding feed source, calculating phase degrees required to be increased by other channels by taking a channel with initial phase precision of 0 in each beam as a reference, and obtaining the length of a surface phase line corresponding to each channel through the phase degrees required to be increased; Printing the surface phase line on the surface of the corresponding positive template, wherein the surface phase line on the positive template is identical to the phase line on the debugging board in length; Replacing a debugging board in the beam forming matrix with each positive template, and retesting the beam forming matrix to obtain coarse adjustment phase precision from each beam to each corresponding feed source; And cutting off part of parallel line segments of the debugging phase line in the channels which do not meet the phase precision requirement by taking the channel with the rough adjustment phase precision of 0 in each wave beam as a reference, so that the phase precision corresponding to each channel finally meets the requirement.
2. The phase accuracy debugging method of claim 1, wherein the method for calculating the surface phase line length corresponding to each channel of any beam comprises the following steps: Assuming that the current wave beam needs to be connected with N feed sources in total, corresponding to N channels, respectively recording phase differences between phase test values and target phase weights of the N channels as Taking the minimum value of the phase difference as delta phi min , taking the channel in which delta phi min is positioned as a reference channel, subtracting delta phi min from the phase difference of other channels to obtain the phase precision of the other channels respectively Based on the delta theta i , the material characteristics and the working frequency of the debugging board, the surface phase line length corresponding to each channel of the current wave beam is obtained by adopting an electromagnetic field simulation method.
3. The phase precision debugging method according to claim 1, wherein the parallel connection method of the debugging phase line and the conventional phase line is as follows: And adding more than two line segments parallel to the side edge of the conventional phase line, and communicating each line segment with the conventional phase line, wherein the more the number of the added line segments is, the larger the phase adjustable range is, and meanwhile, the distance between the line segments is the same as the distance between the first line segment and the conventional phase line, and the larger the distance is, the larger the phase adjustment gradient is.
4. A phase accuracy tuning method as claimed in claim 3, wherein the phase adjustment gradient is determined based on phase accuracy requirements.
5. The method for debugging phase accuracy according to any one of claims 1 to 4, wherein the debugging plate and the positive template are prepared by using the same batch of materials and the same co-firing process flow.

Description

Phase precision debugging method Technical Field The invention belongs to the technical field of communication and radar, and particularly relates to a phase precision debugging method. Background The beam forming matrix is a key component of a multi-beam communication system, a radar system and the like, and can be widely applied to the fields of satellite communication, radar systems and the like. The phase accuracy is one of the key indexes of the beam forming matrix, and directly affects the quality of beam forming, including important indexes such as the direction of the beam, the width of the beam, the side lobe level of the beam and the like, thereby ultimately affecting the quality of communication. When the size of the beam forming matrix is relatively large, the beam forming matrix needs to be realized through complex system design, the system comprises a plurality of functional circuit modules, connecting cables among the modules and the like, the functional circuit modules and the connecting cables can influence the phase precision, and the phase precision errors can be accumulated continuously through the errors of all stages of circuits, so that the phase precision can not meet the use requirement of the system. Taking 64 feeds to form a beam forming matrix of 109 beams as an example, the beam forming matrix comprises 109 paths of beam input signal power dividers, 109 sets of fixed phase shifters and fixed attenuators (each set comprises a plurality of feeds corresponding to the beams), and 64 paths of power synthesizers are output to the feeds. The input signals of each beam are split, the number of the split paths is the same as the number of the feed sources for realizing the beam, the split paths adopt unequal power dividers, so that the amplitude of each path meets the distribution requirement of the amplitude weight of the beam, then the signals of each path meet the distribution requirement of the phase weight of the beam through a fixed phase shifter, and finally the signals sharing the feed sources in all the beams are synthesized through an equal-power equal-phase synthesizer and then transmitted to the feed sources. The number of feeds forming the wave beam, the number of feeds and the amplitude phase weight are all preset. The schematic block diagram of the beam forming matrix is shown in fig. 1, and for convenience, the beam end is uniformly defined as a power distribution end, and the feed source end is uniformly defined as a power synthesis end. The connection relation between the output of the beam end and the input of the feed end is given by an amplitude phase weight table. As can be seen from the schematic block diagram of the beam forming matrix shown in fig. 1, the beam forming matrix includes three circuit modules, namely a power distribution circuit at the beam end, a phase-shifting attenuator circuit, and a power synthesis circuit at the feed end. The transmission of signals between different modules is completed through radio frequency transmission lines, such as radio frequency cables (including radio frequency connectors), microstrip lines, strip lines and the like. Through miniaturized design, the planar microwave circuit can be designed into a three-dimensional laminated circuit by three-dimensional lamination technology of LTCC (Low Temperature Cofired Ceramic, low-temperature co-fired ceramic) in each stage of the circuit in fig. 1, and the planar microwave circuit is embedded in a multi-layer LTCC ceramic substrate, so that the area of the circuit and the number of connecting cables are reduced. In addition, the number of used substrates is reduced by optimizing the topological structure of the beam forming matrix, so that the device is further miniaturized. Fig. 2 shows a block diagram of a miniaturized beamforming matrix LTCC substrate, where signals are transmitted between different substrates and between input and output terminals through radio frequency cables. Through miniaturized design, the planar microwave circuit can be designed into a three-dimensional laminated circuit by three-dimensional lamination technology of LTCC (Low Temperature Cofired Ceramic, low-temperature co-fired ceramic) in each stage of the circuit in fig. 1, and the planar microwave circuit is embedded in a multi-layer LTCC ceramic substrate, so that the area of the circuit and the number of connecting cables are reduced. In addition, the number of used substrates is reduced by optimizing the topological structure of the beam forming matrix, so that the device is further miniaturized. Fig. 2 shows a block diagram of a miniaturized beamforming matrix LTCC substrate, where signals are transmitted between different substrates and between input and output terminals through radio frequency cables. The first type of beam power distribution board is to divide 109 beam signals into 2 paths of signals, and the boards have 109 independent circuits and are distributed on 14 LTCC substrates with