GRGR‐‐UPM Antenna Designs using UPM Antenna Designs using g gg gCST Microwave StudioCST Microwave Studio

José‐Manuel Fernández González, Belén Galocha Iragüen, Manuel Sierra‐Castañer

Grupo de RadiaciónDepartamento de Señales, Sistemas y Radiocomunicaciones

Universidad Politécnica de MadridSpain

1March 23March 23rdrd , 2010, 2010

Outline

Microwave devices & Antenna Designs using CST:

• Conformal Arrays in Millimeter Band• Circularly Polarized Omnidirectional Millimeter Wave Monopole with Parasitic Strip Elements.• Omnidirectional Circularly Polarized Slot Antenna fed by a Cylindrical Waveguide.

M l ib Ci l l P l i d A i X b d• Multibeam Circularly Polarized Antenna in X band• Radar Array Antenna in L Band• Horn Antennas

• Corrugated Horn Antenna in Ku Bandg• Corrugated Horn Antenna in K & Ka Band• Corrugated Horn Antenna in C Band• Choke Horn Antenna in X Band

• Microwave devicesMicrowave devices• Microstrip Branchline Coupler in S Band• Microstrip Feeding Network Multiplexor in S Band

2

Circularly Polarized Omnidirectional Millimeter Wave Monopole with Parasitic Strip Elements

Frequency 36.7 – 37 GHz

Elevation coverage ‐10º to +30º over horizon line

SPECIFICATIONS: MANUFACTURED PROTOTYPE:

Elemento radiante

Polarizador

Elemento radiante

PolarizadorPolarizer

Radiating element

horizon line

Azimuth coverage Omnidirectional

Polarization RHCP

V.S.W.R 2:1

Transición guía - coaxialTransición guía - coaxialCoaxial to waveguide transition

Antenna to waveguide joint

Axial Ratio < 6 dB

ANTENNA STRUCTURE:Guía circularGuía circularCircular waveguide

290 mm290 mm

Transición guía - coaxialTransición guía - coaxialCoaxial to waveguide transition

Antenna input port –Coaxial to waveguide

transition

3

Monopole and conformal reflector – Polarizer with printed strips.for a signal identification system in millimeter band.

Antenna Structure

SIMULATION MODELSIMULATION MODEL:

2mm

5.5mm

Metal (Al)

Teflón

Cobre

2mm

5.5mm

Metal (Al)

Teflón

Cobre

20.64mm20.64mm

ELEVATION COVERAGE:AZIMUTH COVERAGE:RETURN LOSS:

4

Coaxial to Waveguide TransitionSIMULATION MODEL:

Ci l id

SIMULATION MODEL:

Disco adaptador

Guía

Disco adaptador

GuíaCircular waveguide

Matched ring

Reflection coefficient

Circular waveguide TM01

CoaxialCoaxial

TM01TE01

TE11

SIMULATION:

MEASUREMENTS:

5

100 mm100 mm

Prototype

FINAL  PROTOTYPE:

290 mm290 mm

ELEVATION COVERAGE:AZIMUTH COVERAGE:

6

Final Prototype with Radome

SIMULATION MODELSIMULATION MODEL:PVC Radome Teflon Radome

MANUFACTURED PROTOTYPE:

L1,Ø1

L2,Ø2

L1,Ø1

L2,Ø2

L1,Ø1L1,Ø1

L3,Ø3L3,Ø3L2,Ø2L2,Ø2

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Final Prototype with RadomePVC Radome

Teflon RadomeAZIMUTH COVERAGE:

ELEVATION COVERAGE:

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Omnidirectional Circularly Polarized Slot Antenna fed by a Cylindrical Waveguide in Millimeter Band

Frequency 36.7 – 37 GHz

Elevation coverage ‐10º to +30º over horizon line

SPECIFICATIONS: MANUFACTURED PROTOTYPE:

horizon line

Azimuth coverage Omnidirectional

Polarization RHCP

V.S.W.R 2:1

Double coaxial to waveguide transition Conformal slot array

Axial Ratio < 6 dB

Circular ANTENNA STRUCTURE:

Antenna to waveguide joint

waveguideANTENNA STRUCTURE:

Short-circuit

Slot pair Cylindrical

hs

ds

Dg

z

Antenna input port – Coaxial to waveguide transitionCylindrical waveguide

Waveguide discontinuity

Coaxial inner conductor

hg

hdlc

dc

y

x

Conformal slot array with circular polarization for a signal identification system in millimeter 

9

Coaxial cable

hd

wd

g yband.

Coaxial to Waveguide Transition

Circular waveguide

SIMULATION MODEL:

Reflection coefficient

Circular waveguide TM01

TM01TE01

TE11

SIMULATION:

MEASUREMENTS:

10

100 mm100 mm

Antenna Structure

SIMULATION MODEL: ELEVATION COVERAGE:

AZIMUTH COVERAGE:RETURN LOSS:

11

Return Loss & Polarization Optimization

ds+g/2+d

ANTENNA STRUCTURE:

ds

MEASUREMENT RESULTS:MEASUREMENT RESULTS:

12

Prototype

FINAL  PROTOTYPE:

MEASUREMENT RESULTS:

13

Multibeam Circularly Polarized Antenna in X band

Frequency RX: 7.25 – 7.75 GHzTX: 7.9‐8.4 GHz

P l i ti O ti RX b d TX b d

SPECIFICATIONS: PROTOTYPE:SIMULATION MODEL:

Polarization Option RX band TX band

1 LHCP RHCP

2 RHCP LHCP

V.S.W.R 1.6:1

ANTENNA:

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Multibeam circularly polarized antenna for satellite communication in X band.

Multibeam Circularly Polarized Antenna in X band

Dipoles

FoamSubstrate

Circular patchSIMULATION MODEL:

Ground plane

Feeding network

LHCP

SIMULATION:RHCP

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Radar Array Antenna in L band

SPECIFICATIONSFrequency 1215 – 1400 MHz

Polarization linear

SPECIFICATIONS:

PROTOTYPE:

SIMULATION MODEL:

SIMULATION:

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Radar Array Antenna in L bandSIMULATION MODEL:SIMULATION MODEL: PROTOTYPE:

SIMULATION: MEASUREMENTS:Array de 4HxSR. REFLEXIÓN FILA CENTRAL

-12.0S11 medido

-20.0

-18.0

-16.0

-14.0ii(

dB)

S11_medidoS22_medidoS33_medidoS44_medidoS33_simulado

-30.0

-28.0

-26.0

-24.0

-22.0Si

Array de 4HxSR. ACOPLOS FILA CENTRAL

-16-13-10 S12_medido

S13_medidoS14_medidoS23_medidoS24_medidoS34 medido

1.15 1.18 1.21 1.24 1.27 1.3 1.33 1.36 1.39 1.42 1.45Frecuencia (GHz)

40-37-34-31-28-25-22-19

Sij(d

B)

S34_medidoS13_simuladoS23_simuladoS34_simulado

17-55-52-49-46-43-40

1.15 1.18 1.21 1.24 1.27 1.3 1.33 1.36 1.39 1.42 1.45Frecuencia (GHz)

Study the effect of the radome on the antenna characteristics

SIMULATION MODELSIMULATION MODEL:

SIMULATION: MEASUREMENTS:Array de 4HxRC. REFLEXIÓN FILA CENTRAL

-18.0

-16.0

-14.0

-12.0

-28 0

-26.0

-24.0

-22.0

-20.0

Sii(d

B)

S11S22S33S44S33_simulado

Array de 4HxRC. ACOPLOS FILA CENTRAL

19-16-13-10 S12

S13S14S23S24S34S13 sumulado

-30.0

28.0

1.15 1.18 1.21 1.24 1.27 1.3 1.33 1.36 1.39 1.42 1.45Frecuencia (GHz)

-40-37-34-31-28-25-22-19

Sij(d

B)

S13_sumuladoS23_simuladoS34_simulado

18-55-52-49-46-4340

1.15 1.18 1.21 1.24 1.27 1.3 1.33 1.36 1.39 1.42 1.45Frecuencia (GHz)

Radar Array Antenna in L band

STUDY OF THE RADIATING ELEMENT COUPLING EFFECT:

REDUCING THE COUPLING EFFECT BETWEEN ELEMENTS WITH SUPPRESSORS:REDUCING THE COUPLING EFFECT BETWEEN ELEMENTS WITH SUPPRESSORS:

19

Radar Array Antenna in L band

MANUFACTURED PROTOTYPE:

20

Corrugated Horn Antenna in Ku band

SIMULATION MODEL:PROTOTYPE:

MESUREMENT RESULTS:

Ku band Corrugated horn Ku band Corrugated horn for for CassegrainCassegrain ESA ESA reflector at reflector at VillafrancaVillafranca del Castillo (Spain)del Castillo (Spain)

MESUREMENT RESULTS:

21

Corrugated Horn Antenna in K & Ka band

SIMULATION MODELSIMULATION MODEL:

MESUREMENT RESULTS:

22

Corrugated Horn Antenna in C band

SIMULATION MODEL:

PROTOTYPE:

Extended C band (3 625Extended C band (3 625 7 025 GHz) 7 025 GHz) 

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Extended C band (3.625Extended C band (3.625‐‐7.025 GHz) 7.025 GHz) Corrugated horn Corrugated horn for for HispasatHispasat Amazonas  Amazonas  

Earth Station at Earth Station at BrasilBrasil

Corrugated Horn Antenna in C bandMESUREMENT RESULTS:

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Choke Horn Antenna in X band

SIMULATION MODELSIMULATION MODEL: PROTOTYPE:

MESUREMENT RESULTS:

25

Microstrip Branchline Coupler in S band

SIMULATION MODEL: SIMULATION RESULTS:

-3dB

90º

PROTOTYPE: MEASUREMENT RESULTS:

3dB-3dB

3dB

26

-3dB90º

Microstrip Feeding Network Multiplexor in S band

SIMULATION RESULTSSIMULATION MODEL SIMULATION RESULTS:SIMULATION MODEL:

Circular polarization, sequential rotation MEASUREMENT RESULTS:PROTOTYPE:

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