Filter Design for Satellite Communications: Helical Resonator Technology
Filters employing helical resonators are a class of distributed filters that offer a trade-off between performance and size/mass that makes them valuable for use in satellite communications, explain Doumanns, Goussetis, and Kosmopoulos.
The helical resonator filter is another filter type for which the general design procedure is applicable.
Figure B2 shows the mechanical and electrical schematic of a typical five-section helical resonator filter, Once again, resonator parameters and coupling coefficients may be determined experimentally or analytically by the use of EM simulation tools, Usually, a low loss dielectric form that facilitates uniformity, placement and structure supports the helical resonator.
Helical resonator sources typically consist of a coaxial RF coil around a quartz gas pipe, both of which are surrounded by a grounded coaxial can.
The fourth state of matter comes in an assortment of sources, from Kaufmann ion sources to helical resonators.
wafer is much smaller than that probably needed for a helical resonator.
The ESRF Plasma Source is a helical resonator whose fluid-cooled dielectric walls can control internal wall temperatures to less than 150 C.
In an oscillator, suppression of all but the desired HBAR resonance has been accomplished using additional circuit selectivity incorporating one or two pole, helical resonator
Deslandes, "Parametric analysis of helical resonators
for resonant wireless power transmission links," IEEE NEWCAS Conference, 405-408, Jun.
The types of filters include single and multi-sections of waveguide, cavity, coaxial, combline and interdigital filters, as well as helical resonators
. The program is designed to take temperature effects into consideration for minimum frequency drift.