FUTURE CHALLENGES

1. The liquid crystal regions, however, show poor ability to mix with other phases, which can

result in weak weld lines in moulded parts.

2. LCPs are generally incompatible with other polymers.

3. Small processing windows and poor mesophase behavior4. For liquid crystal polymers (LCPs), the tightly ordered self-reinforcing structure tends to

exhibit anisotropic shrinkage. Coz Crystalline and semi-crystalline materials are particularly

prone to thermal shrinkage;

Due to faster transmission speeds in next-generation wireless communications, wirelessbase stations consume an ever-increasing amount of power. The millimeter wave frequencyrange above 30 GHz has a large amount of available bandwidth, because it delivers highspeed and good directionality, its potential for use in high-speed transmissions issignificant. However, due to millimeter-wave frequencies being higher than frequencies forconventional wireless transmissions, it has been difficult to develop amplifiers for practicaluse that are both compact and economical, and thus the millimeter band is not yet widely

used.

In the research area of interactions of EM field with biological systems there are lot of new activities. Extensive internationalactivities are then above all the studies of influence of EM field on man, especially theinfluence of mobile phone on head and brain of its user (these study include often severalthousands tracked men). Scientific studies of EM field effects survey e.g. on its influence onresponse time of man, ability to study new subjects, control of pain, speeding of treatmentprocesse after injury or operation, etc

Recent trends in microwave medical applications are to study the possibilities to develop new

diagnostics based on EM field resp. on microwace technique. A significant importance forthe future can be identified for the next methods:- Magnetic resonance (will not be a part of our project),- Microwave tomography,- Microwave radiometry,- Measurement of complex permittivity,- Imaging in the Terahertz waves band,- Microwave diagnostic radar

Characteristics of LCP

LCP include low dielectric constant, low loss tangent, very laminates with LCP can be fabricated by continuous low moisture absorption (0.040%), high temperature process at more than 200°C…….. without any adhesive and resistance (lead-free solder resistance), flame resistance, chemical resistance, and near hermetic nature. In addition, LCP consists of only aromatic hydrocarbon in chemical composition and adhesive is not necessary for making conductor clad laminates owing to its thermoplastic nature. Thus, this material is environmentally benign and can be recyclable.

Both single-sided and double-sided copper clad laminates with LCP can be fabricated by continuous process at more than 200°C…. without any adhesive and sufficient adhesion strength can be ensured.