PCB Tech - Choosing the appropriate circuit board material to reduce the size of the RF circuit

Choosing the appropriate circuit board material to reduce the size of the RF circuit

With the increasing demand for the mobility and portability of electronic facilities, the medium-sized design of the channel has become more and more important. In the beginning of the design of electronic goods, choosing a suitable circuit boardmaterial does not help to design a smaller volume of RF and microwave paths. Regarding a given frequency range, the use of route plate data with a higher dielectric constant (Dk) will generally make the size and structure of the path smaller. However, the adoption of a plate with a higher Dk value will result in an increase in the unplugging consumption of the passage, and there is a target function that can increase other areas of the passage. At the same time, the Dk value of the route board data will also reflect the target parameters of the path, similar to: radiation consumption, dispersion, meshing, etc.

Regarding the given frequency, the span in the medium will decrease with the increase of the circuit board productionmaterial Dk, which results in that the channel size envisaged on the route board data with a higher Dk value is larger than that of the route board data with a lower Dk value. The route envisaged on the route board data is smaller. In addition, the route board data stored in the higher Dk value will also increase the phase progress of the radio waves (EM) in the department data. The Dk of the route board data is generally used to measure the missing value through the z-axis position of the data (that is, the thickness position) at 10 GHz. The z-axis Dk value of commercial route board materials can be as high as 10 (or higher) or as low as 2 (compared to the atmosphere's Dk equal to 1). But subjectively speaking, but generally with a Dk value of 6 or higher, it can be regarded as a high dielectric constant sheet.

The transmission line manufactured by adopting the route board data with a lower Dk value is in a faster phase. Regarding the medium-sized concept of phase-sluggish pathways (such as phase-controlled defense zone lines), it is necessary to think about Dk's reaction. Therefore, the route board data with a higher Dk value exhibits greater dispersion than the route board data with a lower Dk value. The route plate material with higher Dk value is generally used to orient the engagement device and other passages that require higher engagement coefficient.

As far as a certain target of Dk is concerned, the route board data is generally isotropic. Although the Dk value of the data on the third axis is not opposite, it is generally used to compare the data based on the Dk value on the z-axis position of the data. . Regarding data with a higher Dk value, the Dk difference between the z-axis and the x-y volume of the channel is often greater than the data with a lower Dk value. The Dk values in all three dimensions of the route board data will individually determine the function of the transmission line (such as the microstrip line) being manufactured on the data. For many high-frequency channels, there is generally no need to think about the isotropic characteristics of the line board data Dk, but the isotropy does bring some potential unknown results, especially when the Dk value of the xy three-dimensional and the z-axis When the Dk value differs greatly. This difference can lead to unexpected results in the parallel meshing path beside it, because the meshing height depends on the Dk value on the x-y three-dimensional.

When trying to make the path medium-sized, the easiest way to realize is to minimize the thickness of the route plate data, but the thickness of the route plate data will reflect the multiple target functions of the high-frequency path. Although the radiation consumption of the high-frequency path will increase with the increase of frequency, the thicker route plate data will also show higher radiation consumption than the thinner route plate data with the opposite Dk value. Regarding the given path pattern and assumption, the choice of Dk will also reflect the size of the radiation consumption, because the radiation consumption of the route board material with a higher Dk value is lower than that of the route board material with a lower Dk value.

Regarding the paths that can cause resonance or stray interference (between paths in similar multilayer PCBs), it is not helpful to use thinner routing board data. Resonance spurious levels generally originate from the type of transmission line in the channel. Similar microstrip transmission lines are often more easily affected by resonance and transmission than other types of RF/microwave transmission lines (such as strip lines, coplanar waveguide CPW transmission lines). Thinner routing board materials can help reduce the volume of the PCB, and simultaneously limit the radiation consumption and transmission line circulation performance, such as resonance and intermodulation. Rarely used fortification experience is to use route plank data that is thinner than a quarter span of the highest mission frequency of the passage. But the safer way is to choose the thinner route board data than the one-eighth span of the highest mission frequency.

The line width of the transmission line (similar to the microstrip line) will originate from the thickness of the line board material (similar path laminate or prepreg material). The use of a thicker substrate will widen the amplitude of the superconductor, which can increase the superconductor consumption and pull-out consumption of the passage, but some radio waves may be transmitted under this condition. In order to choose between the thickness of the route board material used in high-frequency design, the general superconductor amplitude should also be less than one-eighth of the span of the highest mission frequency.

The Dk of the route board data plays a major role in determining the superconductor amplitude range of the transmission line. Because the oppositely dimensioned superconductor is envisaged on the high-Dk route board data, the opposite path on the low-Dk data has a lower impedance. Therefore, in order to maintain the 50Ω characteristic impedance of the path, the route envisaged on the route board data with a higher Dk value will be narrower.

Sensible choice

When using route board data that does not have the same Dk value to design a pathway, it is necessary to think about the performance of many measurement choices. The use of high-Dk route board data can not only reduce the size of the channel, but also can complete high-function medium-sized channels by combining high-Dk and low-Dk route board data. Similarly, the band-pass filter formed by the resonant unit is derived from the Dk of the line board material. Due to the distance between each filter unit, the meshing strength reflected by the path plate data Dk in the path is determined. Storage of high-Dk line board data requires stronger meshing, and more time is allowed between filter resonant units.

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