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Microwave Communication and PCB Overview

Microwave communication is a communication method that uses unique equipment and uses frequencies in this frequency band. Microwave communication is a wireless communication method, and wireless communication relies on the propagation of electromagnetic waves (radio waves) in space to transmit messages. Microwave communication is a wireless transmission method for long-distance, large-capacity communication. Microwave communication equipment pcb refers to the PCB circuit board that can be used in RF frequency communication equipment, it includes Radio Frequency PCB, RF Microwave PCB, high frequency rogers pcb,Microwave Radio Frequency PCB, RF communications products.

Considerations for PCB Design of Microwave Communication Equipment

What are the considerations for pcb design of microwave communication equipment(Digital Microwave Communication Equipment)? Mainly pay attention to the following five aspects:

1. Relative Permittivity

The relative permittivity refers to the ratio between the permittivity and the vacuum permittivity. The relative permittivity of substrate materials used for microwave PCB design must be high enough to meet space and weight requirements. However, other applications such as high speed interconnects require extremely low relative dielectric constants to produce high impedance circuits with acceptable line widths and impedance tolerances. Before the final substrate material is determined, a number of parameters must be confirmed, including the line width over a range of board thicknesses, the wavelength of the circuit operating frequency and the approximate dimensions of the main components. A sketch of the board diagram must be drawn in order to establish acceptable large and small relative permittivity. Also, the relative permittivity deviation provided by the substrate material manufacturer must be low enough to keep the electrical properties within tolerance.

2. Loss Tangent

Dielectric loss is a function of loss tangent and relative permittivity, and for some substrate materials, the dielectric loss per unit length can be offset by applying shorter wires that reduce conductor losses, which at high frequencies change. It is very important when it is obvious. Therefore, when estimating component loss parameters in some circuits, the loss per unit length or frequency is estimated rather than the ordinary loss per unit line length at a given frequency. Within a certain frequency range, substrate material losses must be low enough to meet input/output power requirements while avoiding heat dissipation issues. In addition, the power response of some circuit elements, such as filters, must maintain a sharp frequency roll-off in order to meet electrical performance requirements. Of course, dielectric losses affect this frequency characteristic.

3. Substrate Material Thickness

Substrate material thickness is associated with the following design elements:

Element	Consideration
Trace width	In order to maintain a given characteristic impedance, the thickness of the substrate material should be reduced to meet the requirement of reducing the trace width. High impedance traces on thin substrate materials may require extremely low trace widths when fabricated.
Mechanical properties	Circuits constructed on unsupported thin substrate materials may bend, bend or twist, which does not occur with rigid and thermoset materials.
Dimensional stability	Generally speaking, in terms of dimensional stability, the performance of thin substrate materials is worse than that of thick substrate materials. In addition, thin substrate materials can also create setbacks for manufacturers or lead to increased costs.
Cost	Generally, a thicker substrate material per unit area is more expensive than a thin substrate material per unit area.
Consistency	For boards that need to be bent into simple curved shapes such as cylinders or cones, the sheet can be bent to a lower radius of curvature without damage to the substrate material or copper foil.
Dielectric breakdown	For parallel plates, thin dielectric materials have proportionally higher dielectric breakdown voltages than thick materials.
Power handling capacity	The power handling capacity of high-frequency circuit boards can be reduced in two aspects by increasing the thickness of the substrate material. On the one hand, high power can be partially dissipated by heating. On the other hand, high peak power levels can cause the corona to start generating electricity and shorten the life of the substrate material.

4. Environment

Printed circuit board manufacturing and operating environments limit the choice of substrate material, and the main material properties that should be considered include:

Temperature stability, high and low temperatures for operation and technology should be guaranteed, temperature limits should be expressed as "peak" or "continuous", and electrical performance should be calculated at peak temperature and compared with design requirements. During intermittent temperature peaks, the board is unlikely to function properly, so "continuous" temperatures should be used to estimate performance. Permanent damage to the mechanical properties of the circuit board should be checked within the "intermittent" extreme temperature range.
Moisture resistance and chemical resistance. The substrate material should absorb low humidity so that the electrical properties of the circuit board are not significantly degraded in a high voltage environment. After all, additional eco-friendly solutions introduce additional manufacturing costs and design compromises, and the technology to be used needs to be compatible with the chemical and solvent resistance of the base material.
Anti-radiation performance, when RF microwave PCB is used in space or nuclear applications, the substrate material will be exposed to a large amount of ionizing radiation, and the impact of ionizing radiation on the mechanical and electrical properties of the substrate should be ensured and estimated. In addition, the cumulative effect should be ensured and the effective operating life of the board should be compared to it.

5. Other Design Rules for Substrates

The adhesion of the copper coil must be high enough to withstand the application and manufacturing environment to avoid permanent damage.
The relative permittivity varies with temperature, which may affect the electrical properties over the operating temperature range.
The reliability of surface mount devices (SMD) and plated through holes (PTH) is also related to CTE.
The thermal conductivity of the substrate material will affect the design, considering thermal management issues.
Board warpage should be considered in advance when deciding on the enclosure and installation.
Mechanical properties may affect assembly and installation design.
The specific gravity of the substrate material determines the weight of the circuit board.
The coefficient of thermal expansion (CTE) must be carefully considered during extreme ambient temperature and high power component designs, as well as reflow soldering or other high temperature manufacturing applications.
Resistivity may be an electrical property related element, especially when high impedance lines transmit high voltage power amplifier circuits.

Conclusion

The above is about the introduction of microwave video communication equipment pcb and the sharing of design considerations, I hope it will be helpful to you. Our company can produce Radio Frequency(RF) pcb and Microwave PCB Assembly, welcome to contact with ideaspcb.