Thin-film transmission line capacitors can be supplied on low-loss substrates, including quartz, glass, silicon, and alumina, in a variety of lengths and thicknesses

By Heather Hamilton, contributing writer

AVX Corp.
began the new year with the introduction of a line of ultraminiature, thin-film
transmission line capacitors designed for use in high-frequency links, DC
blocking in the UHF range (300 MHz to 3 GHz), and RF/microwave applications
requiring a high performance. The MV series of metal-insulator-metal
(MIM) capacitors
are highly customizable, enabling designers to
optimize the parts for their specific applications.

Complete
with a unique MIM structure, copper traces designed for exceptional circuit connectivity,
a gold-metallized backside ground, and a transmission line wire-bond pad, the capacitors
can be supplied on low-loss substrates, which include quartz, glass, silicon,
and alumina. The capacitors are available in a range of capacitance values from
0.3 pF to 50 pF with a ±20% tolerance, each made with a high-frequency
structure simulator (HFSS) that will combat electromagnetic challenges,
increase RF performance, and ensure reliability.

 

The
line capacitors can be purchased in three standard substrate thicknesses — 5,
10, and 15 mm (0.005, 0.01, and 0.015 in.) — and two standard substrate widths —
20 and 40 mm (0.02 and 0.04 in.). Lengths are determined by transmission line
dimensions, with average lengths about 20 to 80 mm (0.02 to 0.08 in.). The
company notes that lengths beyond 320 mm (0.32 in.) are not uncommon.

The
MV series is rated for up to 100 V, with specific capacitance values from 50 pf/mm2
to 100 pF/mm2, a dissipation factor of less than 0.1%, and a TCC
value of ±60 ppm/°C. The series exhibits 50-Ω standard impedance, though
maximum capacitance values depend on transmission line dimensions.

The
capacitors can be customized by impedance values, substrate materials, and
substrate thicknesses upon request. They are RoHS-compliant and tested to
MIL-STD-883-2011.8 for bond strength, MIL-STD-883-2018 for shear strength, and
MIL-STD-202-108 for lifetime.

There is a variety of packaging options
available, including anti-static waffle pack, tested but un-diced, and tested
and diced on tape. Lead time is 14 weeks. The series is available through AVX’s
distribution partner, Arrow
Electronics
.