山下マテリアル List of Products and Services

Our company manufactures low-loss flexible substrates (GHz band, Microstrip Line). We would like to introduce a flexible substrate that significantly improves transmission loss compared to the combination of polyimide-based and standard coverlay products. Using a PTFE base with a low-dielectric coverlay, we can expect a 60-70% improvement in transmission loss at the 40GHz band compared to standard products. Additionally, while the performance is slightly lower compared to PTFE-based substrates, a combination of LCP base and LCP coverlay can also expect about a 50% improvement in transmission loss and is suitable for long-term heat resistance and low outgassing applications due to the absence of adhesives. *For more details, please refer to the PDF materials or feel free to contact us. *Abbreviation explanations: PTFE ... Fluoropolymer LCP ... Liquid Crystal Polymer

The "Ultra-Fine Circuit High-Frequency Flexible Substrate" is a flexible substrate designed for high-frequency applications in the GHz range, compatible with bare chip mounting. By using LCP (Liquid Crystal Polymer) with low dielectric properties as the core material and forming circuits using the SAP (Semi-Additive Process), it is possible to create transmission lines with a differential impedance of 100Ω at wiring pitches below 50μm. To accommodate wire bonding with bare chips, the mounting pads are treated with ENEPIG (Electroless Ni Pd Au plating) for surface treatment. One of the features of SAP is its high precision in circuit formation, with an accuracy of ±5μm, making it suitable for impedance control. *For more details, please download the PDF or contact us.*

The "Card Edge Compatible Multi-Layer Flexible Printed Circuit Board (FPC)" provided by our company is a multi-layer flexible circuit board designed to accommodate card edge connectors with double-sided contacts. By reducing the connection points between printed circuit boards and flexible circuit boards, a stable impedance line is formed, which is expected to improve signal integrity at high frequencies of 10 GHz and above. The substrate uses polyimide film, and soft resist ink is used as the insulating material, allowing for flexibility, making it suitable for installation in tight spaces. 【Features】 ■ A partially bendable structure that has similar functionality to rigid-flex boards, enabling the formation of highly reliable vias. ■ A structure that integrates flexible and rigid parts without connection points or via transitions, allowing for the formation of stable impedance lines. ■ High-density wiring is possible with 100μm pitch wiring and vias with a land diameter of 300μm or less. ■ Integration of connections between boards contributes to a reduction in assembly labor. *For more details, please refer to the PDF materials. Feel free to contact us with any inquiries.

Button-plated flexible printed circuit boards (FPC) can utilize the original thickness and characteristics of copper foil by applying through-hole plating only to the through-holes and through-hole lands. This allows for uniform maintenance of conductor thickness, enabling the formation of high-precision wiring, which is expected to provide high-accuracy impedance control, making it ideal for high-speed transmission applications. Compared to conventional panel plating methods, button-plated FPCs excel in flexibility and bendability, achieving ultra-thin designs. This enables the lightweight and compact design of products. The new method also allows for button plating on narrow pitch patterns. Product Features: 1. By applying copper plating only to the through-holes, the original characteristics of the copper foil are maximized. 2. High-precision impedance control is possible, demonstrating performance suitable for high-speed transmission. 3. Compared to panel plating methods, it excels in flexibility and bendability while achieving ultra-thin designs. 4. It provides stable quality with technology that has cleared reliability evaluations based on JISC5016. 5. Through-hole plating is possible even for narrow pitch patterns, which were previously difficult to achieve.

Achieving Thinness While Maintaining Transmission Characteristics! 【Features】 ■ This technology resolves the relationship between the thickness of the FPC and conductor loss, which is a challenge of microstrip lines. ■ By incorporating a slit design in the ground (GND) plane, it is expected to achieve a thinner FPC while maintaining transmission characteristics. ■ A 0mm slit processing is applied between patterns, accommodating a bendable 'slit shape'. *For more details, please refer to the PDF document or feel free to contact us.

The "Flexible substrate compatible with high-speed transmission connectors" combines the high-speed transmission connectors from Irisoh Electronics, [IMSA-11600S-30Y900 and IMSA-11501S-30Y900], with our YFC series (LVDS type microstrip line) RFM. By integrating them, it supports high-speed transmission up to 15GHz. 【Features】 ■ The LVDS-compatible FPC has been slotted. ■ It is easy to bend and can also be twisted for use. *For more details, please refer to the PDF document or feel free to contact us.

The low-rebound, high-speed transmission FPC adopts a stripline structure and is an excellent flexible substrate for noise countermeasures using shielding materials. Compared to conventional 3-layer FPCs, it is approximately 200μm thinner and reduces rebound force to about one-third, while keeping transmission loss at the same level or lower. This innovative FPC, developed for communication devices, is expected to improve assembly workability and be used in movable parts. 【Four Features】 1. Reduces transmission loss to the same level or lower compared to conventional 3-layer FPCs and decreases rebound force to about one-third. 2. Improves assembly workability and allows for use in movable parts. 3. Enhances noise countermeasures through the adoption of stripline structure and shielding materials. 4. Supports compact device design due to its thin profile. For more details, please refer to the PDF materials or feel free to contact us.