DK-18 is a MgTiO3 based ceramic, which is widely used as Patch Antenna substrates in Satellite and GPS communication systems. This dielectric, coming in the medium permittivity materials, possesses extremely low dielectric loss (tand~10-5) in microwave frequency ranges.

Electronic ceramics with high permittivity (er>20) and low dielectric loss (tand<10-3) have a number of applications in microwave devices like filters, oscillators, multiplexers etc in terrestrial as well as Space communications systems ranging from UHF to mm-band frequencies. In such devices, it is desirable that the ceramics have high er to confine the electromagnetic waves near them. However, when applications like antennas and substrates are considered, 10<er<20 is desirable for better radiation field outside the ceramic and size reduction. Their advantages are small size, light weight, temperature stability etc. Globally, a few materials have been manufactured for use in specific range of microwave spectrum. This indigenously developed DK18 is equivalent to Kyocera SM200 and P series of Murata that are used as substrates for GPS antennas

Typical properties:

Appearance Light cream
Bulk density (g/cc) 3.7±0.15
Open Porosity Nil
TClosed Porosity <2%
Resistivity ( 1013
Coeff. of Thermal Expansion (10-6/K) 9.2
Dielectric constant (er) 19±1.5
Quality factor (Qu @ GHz) 12,000 (6.5)
Loss factor (tand, 10-5) 8.4
Temp. coeff. of frequency (tf, ppm/K) 0 ± 5
TE01d resonator size at 5 GHz (D=2L, mm) 14


ISRO is willing to offer the knowhow of this technology to suitable entrepreneurs / industries in India. Capable manufacturing industries interested in acquiring this knowhow may write with details of their present activities, requirements and plans for implementation, infrastructure and technical expertise available with them, their own market assessment, if any, and plans for diversification to the address given below:


Technology Transfer & Industrial Coordination Division (TT&IC)

Vikram Sarabhai Space Centre, ISRO PO

Thiruvananthapuram-695 022

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Ph: 0471-2564081

Fax: 0471-2564134

Ph: 0471-2564081/2565133/2565695

Fax: 0471-2564134 

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