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Implementation of a low Profile Risley Prism Using Additive Manufacturing
KTH, School of Electrical Engineering and Computer Science (EECS).
KTH, School of Electrical Engineering and Computer Science (EECS).
2025 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Satellite communication provides an important al-

ternative to infrastructure in areas without internet access.

Risley prisms are a good option for Low Earth Orbit satellite

communication because of their beam steering properties. They

are cheap to manufacture and more compact compared to the

alternatives. In this report, an alternative design of a Risley prism

is proposed, which suggests a decreased total height of the prism.

Two matching layers is implemented to minimize reflections and

obtain better directivity. A prototype of the prism is designed and

implemented using additive manufacturing. Two ABS materials

with relative permittivities εr1 = 8 and εr2 = 3 are used for

the manufacturing. Simulations show promising results between

26 GHz and 28 GHz, with a directivity at approximately 25◦, a

side lobe level of approximately −15 dB and an S11-parameter

of −10 dB or lower. The directivity of the prism is measured to

refract approximately 25◦ and the side lobe level is approximately

5 dB. Due to restrictions of the manufacturing and losses from

the feeding antenna, the simulated results have a greater side

lobe level than the measured ones. The prism is tested using a

circularly polarized wave, when it is intended for a plane wave.

This causes the measured results to differ from the simulated

ones.

Abstract [sv]

Satellitkommunikation är ett viktigt alter-

nativ till infrastruktur i regioner utan tillgång till internet. Ris-

leyprismor är ett bra alternativ för satelliter i låg omloppsbana

(LEO-satelliter) tack vare sin goda strålstyrningsförmåga. De

är också billiga att tillverka och mer kompakta jämfört med

alternativen. I rapporten presenteras en alternativ design av en

Risleyprisma vars totala höjd är minskad. Prisman använder

två antireflektionslager som ska minska reflektioner och ge

en bättre direktivitet. En prototyp av prisman designas och

implementeras med hjälp av additiv tillverkning. Två material

i ABS-plast med relativa permittiviteter εr1 = 8 och εr2 = 3

används i tillverkningen. Simulationer av prisman visar lovande

resultat mellan 26 GHz och 28 GHz, med en direktivitet riktad

i approximativt 25◦, en skillnad mellan huvud- och sidlober

på approximativt 15 dB och en S11-parameter på −10 dB eller

lägre. Mätningar visar att prisman riktar vågor approximativt

25◦ och har en skillnad på approximativt 5 dB. På grund av

begränsningar i tillverkningen samt förluster från den strålande

antennen ger det simulerade resultatet en större skillnad mellan

huvud- och sidlober än det uppmätta. Prisman testas med en

cirkulärt polariserad våg när den är avsedd för en plan våg. Det

här gör att det uppmätta resultatet skiljer sig från det simulerade

reslutatet.

Place, publisher, year, edition, pages
2025. , p. 251-260
Series
TRITA-EECS-EX ; 2025:125
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-376027OAI: oai:DiVA.org:kth-376027DiVA, id: diva2:2033660
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Kandidatexamensarbete i Elektroteknik 2025, EECS, KTHAvailable from: 2026-01-29 Created: 2026-01-29 Last updated: 2026-02-06

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