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Dual Band Circular Polarization Selective Structures for Space Applications

Lundgren, Johan LU (2016) EITM01 20161
Department of Electrical and Information Technology
Abstract
Satellites are key components in today's modern world, but they are expensive
to launch and the orbits are crowded. With use of a dual band
circular polarization selective structure (CPSS) the satellites can be improved
and the number of reflectors needed to carry out a certain task can
be reduced. A dual band CPSS reflects one handedness of circular polarization
and transmits the other, over a certain frequency band, and over
the other frequency band the opposite occurs. This can be done with use of
a CPSS coated reflector or a diplexer type setup. This thesis investigates,
through full wave simulations of normal incidence, dierent candidates for
dual band reciprocal symmetrical CPSS. The frequency bands of interest
in this... (More)
Satellites are key components in today's modern world, but they are expensive
to launch and the orbits are crowded. With use of a dual band
circular polarization selective structure (CPSS) the satellites can be improved
and the number of reflectors needed to carry out a certain task can
be reduced. A dual band CPSS reflects one handedness of circular polarization
and transmits the other, over a certain frequency band, and over
the other frequency band the opposite occurs. This can be done with use of
a CPSS coated reflector or a diplexer type setup. This thesis investigates,
through full wave simulations of normal incidence, dierent candidates for
dual band reciprocal symmetrical CPSS. The frequency bands of interest
in this thesis are 17.7-20.2 GHz and 27.5-30.0 GHz and the goals are: insertion
loss and return loss of less than 0.50 dB and an axial ratio of less
than 0.78 dB (or 1.74 dB if diplexer setup is considered) for the targeted
circular polarization within the frequency band.

The dual band CPSS candidates consists of multiple layers of non-resonant
metal elements, meander lines and capacitively loaded strips, on substrates
inter-spaced by low-permittivity foam sheets. Two meander line designs
of 6 and 9 layers fulll the goals specied for the diplexer setup with a
bandwidth of 14.73-20.55 GHz (33.0%) and 27.04-30.82 GHz (13.1%) for
the 6 layer design, 14.55-20.76 GHz (35.2%) and 27.20-30.31 GHz (10.8%)
for the 9 layer design. Moreover the 9 layer meander line design fulll most
of the stricter axial ratio requirement with bandwidth of 16.16-20.38 GHz
(23.1%) and 28.31-29.53 GHz (4.2%). (Less)
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author
Lundgren, Johan LU
supervisor
organization
course
EITM01 20161
year
type
H2 - Master's Degree (Two Years)
subject
keywords
circular polarization selective structure, polarization selectivity, circular polarization, dual band, CPSS, satellite, space application, meander lines
report number
LU/LHT-EIT 2016-540
language
English
id
8889877
date added to LUP
2016-09-20 11:17:52
date last changed
2016-09-20 11:17:52
@misc{8889877,
  abstract     = {Satellites are key components in today's modern world, but they are expensive
to launch and the orbits are crowded. With use of a dual band
circular polarization selective structure (CPSS) the satellites can be improved
and the number of reflectors needed to carry out a certain task can
be reduced. A dual band CPSS reflects one handedness of circular polarization
and transmits the other, over a certain frequency band, and over
the other frequency band the opposite occurs. This can be done with use of
a CPSS coated reflector or a diplexer type setup. This thesis investigates,
through full wave simulations of normal incidence, dierent candidates for
dual band reciprocal symmetrical CPSS. The frequency bands of interest
in this thesis are 17.7-20.2 GHz and 27.5-30.0 GHz and the goals are: insertion
loss and return loss of less than 0.50 dB and an axial ratio of less
than 0.78 dB (or 1.74 dB if diplexer setup is considered) for the targeted
circular polarization within the frequency band.

The dual band CPSS candidates consists of multiple layers of non-resonant
metal elements, meander lines and capacitively loaded strips, on substrates
inter-spaced by low-permittivity foam sheets. Two meander line designs
of 6 and 9 layers fulll the goals specied for the diplexer setup with a
bandwidth of 14.73-20.55 GHz (33.0%) and 27.04-30.82 GHz (13.1%) for
the 6 layer design, 14.55-20.76 GHz (35.2%) and 27.20-30.31 GHz (10.8%)
for the 9 layer design. Moreover the 9 layer meander line design fulll most
of the stricter axial ratio requirement with bandwidth of 16.16-20.38 GHz
(23.1%) and 28.31-29.53 GHz (4.2%).},
  author       = {Lundgren, Johan},
  keyword      = {circular polarization selective structure,polarization selectivity,circular polarization,dual band,CPSS,satellite,space application,meander lines},
  language     = {eng},
  note         = {Student Paper},
  title        = {Dual Band Circular Polarization Selective Structures for Space Applications},
  year         = {2016},
}