Rogres duroid 5880 High Frequency PCB

Description
Data Sheet

1. Overview of Rogers Duroid 5880 & 5870 Microwave Laminates

Rogers Duroid 5880 and Rogers Duroid 5870 are high-performance microwave laminates, both belonging to non-woven glass microfiber reinforced polytetrafluoroethylene (PTFE) composites. Designed specifically for high-frequency precision applications, these two materials share excellent electrical and mechanical properties, providing reliable support for the design and manufacturing of microwave-level high-frequency circuit PCBs, especially in scenarios requiring low loss, high stability, and broadband performance.

2. Features and Benefits

Rogers Duroid 5880 and 5870 laminates stand out among reinforced PTFE materials with their comprehensive performance advantages, bringing significant value to high-frequency circuit design and production. Their core features and corresponding benefits are as follows:

Lowest electrical loss for reinforced PTFE material: This feature ensures low insertion loss during high-frequency signal transmission, effectively reducing signal attenuation and enabling the design of high Q circuits. High Q circuits have better selectivity and stability, which is crucial for precision microwave applications.
Low moisture absorption: The ultra-low moisture absorption of the materials eliminates the need for special storage requirements, simplifying the production and storage process. At the same time, it minimizes the impact of moisture on electrical loss, ensuring stable electrical performance even in environments with varying humidity.
Isotropic performance: The isotropic characteristics of the materials ensure consistent mechanical and electrical properties in all directions, which significantly improves the performance of filters and directional couplers, ensuring uniform signal transmission and reducing performance deviations.
Uniform electrical properties over frequency: The electrical parameters of the laminates remain stable across a wide frequency range, enabling repeatable circuit designs and making them suitable for very broadband applications, adapting to the diverse frequency requirements of modern microwave equipment.
Excellent chemical resistance: The materials are immune to the effects of typical processing chemicals used in PCB manufacturing, such as etching and plating reagents. This ensures the integrity of the laminates during processing, avoiding performance degradation caused by chemical corrosion and extending the service life of the final PCB products.

3. Typical Applications

Benefiting from their excellent comprehensive performance, Rogers Duroid 5880 and 5870 microwave laminates are widely applied in various high-end microwave and high-frequency fields, including:

Commercial Airline Telephony PCB
Microstrip and Stripline Circuits PCB
Millimeter Wave Applications PCB
Military Radar Systems PCB
Missile Guidance Systems PCB
Point-to-Point Digital Radios PCB
Antennas PCB

4. Microstrip Line Theory:
Basis for Microwave High-Frequency Circuit PCB Design

For microwave-level high-frequency circuits, the design of transmission lines is crucial, and microstrip line theory serves as the core basis for microwave high-frequency circuit PCB design. The specific principles and key points are as follows:

4.1 Formation of Microstrip Lines and Striplines

In a microwave-level high-frequency circuit PCB, each corresponding stripline forms an asymmetric microstrip line with the ground plate. For PCBs with more than two layers, both microstrip lines (asymmetric) and striplines (symmetrical microstrip transmission lines) can be formed. Different microstrip lines (on double-sided PCBs) or striplines (on multi-layer PCBs) form coupled microstrip lines with each other, thereby constructing various complex four-port networks and achieving the diverse characteristics of microwave-level circuit PCBs.

4.2 Key Parameters of Microstrip Lines

The characteristic impedance ZC of an air microstrip line is only related to its structural parameters (width w and height H). The effective permittivity εₑ is not only related to the structural parameters w and H but also to the relative permittivity of the dielectric substrate. By using the corresponding calculation formula, the characteristic impedance ZC of microstrip lines with different w/h ratios can be obtained when the dielectric constant of the substrate is εᵣ; conversely, the w/h ratio can also be calculated based on the required characteristic impedance ZC, providing a theoretical basis for circuit design.

4.3 Loss and Attenuation of Microstrip Lines

The loss of microstrip lines mainly includes three types: dielectric loss of the substrate, ohmic loss of the conductor, and radiation loss. Among them, dielectric loss and ohmic loss are the main loss sources. As long as the size of the microstrip line is properly designed and the dielectric constant of the substrate is appropriate, the radiation loss can be ignored. To reduce radiated interference in practical applications, the specifications of the microstrip line and the performance of the substrate material should be considered first.

Signal attenuation in microstrip lines is usually represented by the attenuation coefficient α, which is the sum of the dielectric attenuation constant α_D and the ohmic attenuation constant α_C, i.e., α = α_D + α_C. The attenuation coefficient α reflects the logarithmic value of the amplitude attenuation (voltage or current) of the signal per unit length of the microstrip line, directly affecting the signal integrity of the high-frequency circuit.

5. Supplementary Introduction to Rogers Duroid 5880

Rogers Duroid 5880 is a filled PTFE composite material designed specifically for precision stripline and microstrip circuit applications. Its unique filler formula endows the material with low density and a lightweight S-shape, which can well meet the requirements of off-frequency performance and applications sensitive to J5, making it more suitable for high-precision, lightweight microwave equipment scenarios.

Model: Rogers droid 5880 High-Frequency PCB

Material:Rogres RT5880 20mil(0.508mm)

Layer : 2Layers

D K : 2.2

Finished Thickness : 0.6MM

Copper Thickness : 1OZ

Dielectric Thickness : 20mil(0.508mm)

Surface Treatment：Immersion Gold

Application：Microwave Antenna PCB, Microstrip and Stripline Circuits pcb

Rogers duroid 5880 High Frequency PCB

Description

Data Sheet