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Inmarsat Phased Array Design using Antenna Magus

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Searchable database

Design antenna

Synthesise array

Estimate performance

Export parameterized

CST STUDIO SUITE® model

Antenna Magus

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Inmarsat-4: Design Specifications

Gain nominal gain of 12 dBic and max 17 dBic across majority, (85%) of the spherical coordinates

Satellite Discrimination 13 dB

Steer angle 360 degrees azimuth, 180 degrees elevation.

Size constraints fit under radome = 1000 x 400 x 50 mm3

Single Element Phased Array

1518 MHz 1675 MHz

RHCP

Frequency [MHz]

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Element Choice (i): Bandwidth

Stacked element has

more bandwidth

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Element Choice (ii) RHCP

How to circularly polarize

the chosen element?

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Element Choice — Summary

Combine the desirable

characteristics of these

two antennas

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Initial Design

z-axis scaled for

better visibility

To improve initial design

Info browser in Antenna Magus

Design guidelines in Antenna Magus

Optimization in CST STUDIO SUITE®

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Finalized Design — within Specification

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Add the New Design to Antenna Magus

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Array Synthesis

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Construct Finite Array

Export distribution matrix to

CST STUDIO SUITE®

Construct array from element

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Simulation Results

Finite array with no beam steering (main lobe

is broadside).

Simulation requires 1.5 GB RAM and 1.25 hours

on a standard issue laptop.

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Scan Performance theta = 45°, phi = 45° theta = 50°, phi = 70°

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Simulated Like Measured Standard ARINC 781 ground plane 2.4 x 1.6 m section of a 3m radius cylinder

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Installed Performance

Phased

array

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Large library of antennas

New designs are easy

Quick estimation functionality

Include your own antenna in the library

Exports are parameterized

Perfect companions to CST STUDIO SUITE®

Conclusion