Four MetroCirc™ Solutions

This section introduces the four characteristics of MetroCircTM.
MetroCircTM possesses the following four major characteristics.
* Click each of the characteristics to view further details.
MetroCirc™ (Multilayer Resin Substrate) Characteristics

SubTitleIconNo01 High Frequency and Low Loss

Compared to previous resin materials, MetroCircTM has a smaller relative dielectric constant and dielectric loss tangent, and it does not use adhesive to bond the layers in the multilayer substrate manufacturing process.
This makes it possible to achieve a substrate and components that have low loss in the high frequency range.
Low loss in the high frequency range indicates superior characteristics for recent applications for high-speed digital transmission.


Comparison of transmission line insertion loss

Comparison of transmission line insertion loss

This graph compares the loss of a MetroCircTM transmission line with an FPC transmission line. As you can see, MetroCircTM is able to achieve low-loss products to contribute to low power consumption and improve communication performance in customer products. It can also form more detailed electrode patterns compared to previous resin substrates. In addition to reducing the thickness variation by not using adhesive between the layers, the formation of minute electrode patterns enables highly precise impedance control, which is important in the high frequency range and in high-speed digital transmission.


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SubTitleIconNo02 Maintains Complex 2D and 3D Shapes


MetroCirc™, which can be cut out by laser cutting, bent in three dimensions and held that shape, enables complex 2D and 3D shape designs.
The following video introduces the bending and shape maintainability out of the characteristics of MetroCircTM.


In the MetroCircTM process, a laser cutter is used to cut out each individual product. Therefore, we can easily handle requests for various complex 2D shapes.
Because no molds are used, we can respond to design changes in a short delivery time and at a low cost.

Support for complex 2D shapes

Support for complex 2D shapes


Bending can be applied to 3D shapes according to customer needs thanks to the flexible, high-strength characteristics of the MetroCircTM material.
MetroCircTM that has not been bent is perfectly flat, but the necessary regions can be bent, as origami paper is folded, according to customer requests.

MetroSheet™ origami


It was difficult for the previous FPCs to maintain their shape due to spring back. However, MetroCircTM characterized by shape maintainability can help customers easily assemble products and reduce man-hours.


Comparison with FPC regarding support for complex 3D shapes

Comparison with FPC regarding support for complex 3D shapes


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SubTitleIconNo03 High-density and Thin Multilayer Substrate

MetroCircTM uses a batch press for its multilayer lamination technology, which achieves a high-density and thin multilayer substrate.

MetroCircTM
cross-sectional structure example and characteristics

MetroCirc™ cross-sectional structure example and characteristics


The following three characteristics contribute to the high density.
  • Finer patterns can be formed due to etching, compared to previous resin substrates.
  • Blind, buried, and other via holes can be freely formed.
  • Cavities can be easily formed.
The following four characteristics contribute to the thin profile.
  • Thin sheets with a highly precise thickness can be used.
  • Sheets with different thicknesses can be combined into multilayers.
  • Odd-numbered layers can be easily multilayered with batch lamination, as opposed to the previous build-up substrate method.
  • Adhesive is not required between layers.
Fusing all of these characteristics achieves thin multilayer substrate with high density, that contributes to customers’ flexible design and space saving inside products.


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SubTitleIconNo04 Resistant to Temperature Changes and Water

Compared to previous resin substrates (glass epoxy substrates, FR-4 substrates, FPC, etc.), MetroCircTM uses a resin material with a low ratio of water and moisture absorption.
In addition, adhesive is not required to bond the layers. Thus, MetroCircTM can achieve products with high reliability having excellent water and perspiration resistance.


Comparison of characteristic variations in a high temperature and humidity test

Comparison of characteristic variations in a high temperature and humidity test


The graph compares the changes in loss before and after the high temperature and humidity test for the MetroCircTM and FPC transmission lines.
As you can see, the MetroCircTM loss is stable.
This characteristic is effective for wearable devices and other products that are worn close to the body.


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