Research Activities on Eleven Feed: 1-13GHz Eleven Feed and Dual - - PowerPoint PPT Presentation

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Research Activities on Eleven Feed: 1-13GHz Eleven Feed and Dual - - PowerPoint PPT Presentation

Jun 18, 2023 44 likes •231 views

Chalmers University of Technology Research Activities on Eleven Feed: 1-13GHz Eleven Feed and Dual Band (C/Ku) Solution based on Eleven Feed and Choke Horn Jian Yang, Xiaoming Chen, Adeel Yasin and Per-Simon Kildal Chalmers University of

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COSTic0603 ASSIST April 10, 2008 Limassol, Cyprus

Chalmers University of Technology

Research Activities on Eleven Feed:

1-13GHz Eleven Feed and Dual Band (C/Ku) Solution based on Eleven Feed and Choke Horn

Jian Yang, Xiaoming Chen, Adeel Yasin and Per-Simon Kildal Chalmers University of Technology Göteborg, Sweden

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COSTic0603 ASSIST April 10, 2008 Limassol, Cyprus

Chalmers University of Technology

Background: Alternative wideband feed technology

Feed developed at UC Berkley

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SLIDE 3

COSTic0603 ASSIST April 10, 2008 Limassol, Cyprus

Chalmers University of Technology

Log-periodic feeds for reflector antennas

Example: Lowest frequency 500 MHz The Eleven antenna: 11 times smaller ……-and better Breakthrough in wideband technology

Old technology New technology

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COSTic0603 ASSIST April 10, 2008 Limassol, Cyprus

Chalmers University of Technology

Idea behind Eleven feed new invention

  • Two parallel dipoles over

ground (Eleven configuration)

– equal E- and H-plane patterns – Beamwidth constant with frequency – phase center is locked to the ground plane – low far-out sidelobes and backlobes.

  • Decade bandwidth by

– Log-periodic array – Folded dipoles

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SLIDE 5

COSTic0603 ASSIST April 10, 2008 Limassol, Cyprus

Chalmers University of Technology

Previous developed Eleven antennas

for Green Bank radio telescope for 150 – 1700 MHz. for RATAN telescope for 500 – 3000 MHz

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SLIDE 6

COSTic0603 ASSIST April 10, 2008 Limassol, Cyprus

Chalmers University of Technology

CAD drawings (left) and photos (right)

  • f 1-13 GHz Eleven feed

Feed mounted between upper and lower support foam. Without upper a support foam.

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SLIDE 7

COSTic0603 ASSIST April 10, 2008 Limassol, Cyprus

Chalmers University of Technology

Input impedance analysis including center puck using “3 software method” (Chen Xiaoming)

T erm T erm 2 Z =50 O hm N um =2 H ybrid180 H YB3 PhaseBal=0 G ainBal=0 dB Loss=0 dB

IN ISO

T erm T erm 1 Z =50 O hm N um =1 D eem bed12 SN P10 File="D :\users\default\centerpuck_prj\data\centerpuck.s12p"

2 3 1 1 1 1 2 7 8 9 4 6 5 Re f 1

R R 1 R =50 O hm H ybrid180 H YB2 PhaseBal=0 G ainBal=0 dB Loss=0 dB

IN ISO

S1P SN P8 File="D :\users\default\centerpuck_prj\data\FoldPlt.s1p"

1 Re f

S1P SN P4 File="D :\users\default\centerpuck_prj\data\FoldPlt.s1p"

1 Re f

S1P SN P7 File="D :\users\default\centerpuck_prj\data\FoldPlt.s1p"

1 R e f

S1P SN P2 File="D :\users\default\centerpuck_prj\data\FoldPlt.s1p"

1 Re f

S1P SN P9 File="D :\users\default\centerpuck_prj\data\FoldPlt.s1p"

1 Re f

S1P SN P3 File="D :\users\default\centerpuck_prj\data\FoldPlt.s1p"

1 Re f

S1P SN P5 File="D :\users\default\centerpuck_prj\data\FoldPlt.s1p"

1 Re f

S1P SN P6 File="D :\users\default\centerpuck_prj\data\FoldPlt.s1p"

1 Re f

R R 2 R =50 O hm

CST center puck model Center puck S-parameter WIPL-D antenna model Antenna S-parameter ADS integration

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SLIDE 8

COSTic0603 ASSIST April 10, 2008 Limassol, Cyprus

Chalmers University of Technology

Measured and simulated reflection coefficient

2 4 6 8 10 12

  • 20
  • 18
  • 16
  • 14
  • 12
  • 10
  • 8
  • 6
  • 4
  • 2

Frequency(GHz) Reflection coefficient(dB) simulated by WIPL-D simulated by 3-software-method mearuement

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SLIDE 9

COSTic0603 ASSIST April 10, 2008 Limassol, Cyprus

Chalmers University of Technology

Radiation patterns in 45 deg plane

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SLIDE 10

COSTic0603 ASSIST April 10, 2008 Limassol, Cyprus

Chalmers University of Technology

Dual Band Solution based on Eleven Feed and choke horn

Simulation model photos of prototype

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SLIDE 11

COSTic0603 ASSIST April 10, 2008 Limassol, Cyprus

Chalmers University of Technology

Reflection coefficient for Eleven Feed

Simulated and measured data and the set-up of measurement

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SLIDE 12

COSTic0603 ASSIST April 10, 2008 Limassol, Cyprus

Chalmers University of Technology

Reflection coefficient for choke horn

Simulated and measured data and the set-up of measurement

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SLIDE 13

COSTic0603 ASSIST April 10, 2008 Limassol, Cyprus

Chalmers University of Technology

Coupling between Eleven and horn

Simulated and measured data and the set-up of measurement

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SLIDE 14

COSTic0603 ASSIST April 10, 2008 Limassol, Cyprus

Chalmers University of Technology

Radiation patterns for Eleven

6GHz 6.5GHz

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SLIDE 15

COSTic0603 ASSIST April 10, 2008 Limassol, Cyprus

Chalmers University of Technology

Radiation patterns for horn

10.5GHz 15GHz

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SLIDE 16

COSTic0603 ASSIST April 10, 2008 Limassol, Cyprus

Chalmers University of Technology

Conclusions for 1 – 13 GHz Feed

  • Reflection coefficient below -10 dB up to 7.5 GHz.
  • 3-software-method can give much better prediction up

to 13 GHz with much more computational efficiency.

  • Measured radiation patterns agree with simulation. But

there are shoulders in measured radiation patterns for high frequencies.

  • The used kapton film is not proper type which causes

unacceptable loss in the feed. We are manufacturing a new feed by using much lower loss dielectric films and hope the loss will be reduced.

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SLIDE 17

COSTic0603 ASSIST April 10, 2008 Limassol, Cyprus

Chalmers University of Technology

Conclusions for dual-band solution

  • Good performance at both bands
  • Low loss at both bands
  • Easy for manufacturing
  • Need to do more research to reduce the gap

between the two bands

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SLIDE 18

COSTic0603 ASSIST April 10, 2008 Limassol, Cyprus

Chalmers University of Technology

Thank you