Filtrujc antny Typical planar antenna Can be all the functions - - PowerPoint PPT Presentation

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Filtrujc antny Typical planar antenna Can be all the functions - - PowerPoint PPT Presentation

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Filtrujc antny Typical planar antenna Can be all the functions accomplished by a single structure? frequency spatial impedance filter filter matching VERDU, J., PERRUISSEAU-CARRIER, J., COLLADO, C., MATEU, J., HUELTES, A.

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Filtrující antény

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frequency filter spatial filter impedance matching

VERDU, J., PERRUISSEAU-CARRIER, J., COLLADO, C., MATEU, J., HUELTES, A. Microstrip patch antenna integration on a band-pass filter topology. In proc. 12th Mediterranean Microwave Symposium (MMS2012), no. EPFL-CONF-179874. 2012.

  • Can be all the functions accomplished by a single

structure?

Typical planar antenna

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  • Impedance discontinuities 

 forward and backward waves:

  • Pass-band: constructive interferences
  • Transmission line: d /dt

Planar filter

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  • If x = /2 …

Bandpass filter

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  • Currents on patches  radiated waves:
  • Main lobe: constructive interferences
  • Antenna: int( dt )

   

       

2 A 11 A 21

1 , , S AF D S    

Patch array, serial feeding

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WU, W. J., YIN, Y. Z., ZUO, S. L., ZHANG, Z. Y., XIE, J. J. A new compact filter-antenna for modern wireless communication systems. IEEE Antennas and Wireless Propagation Letters.

  • vol. 10. DOI: http://dx.doi.org/10.1109/lawp.2011.2171469
  • Last resonator in the filter replaced by

an antenna

Inspiration

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Patch array & apertures

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Equivalent circuit

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Planar antennas Apertures in ground plane Transmission line

Equivalent circuit

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Planar antennas Apertures in ground plane Transmission line

  • 3 parallel RLC resonators

                 1 1

2

L j RLC R RL j D C B A                    1 jJ jJ D C B A 

        

            l l Y l Z l D C B A

c c

    cosh sinh sinh cosh

  • 3 J inverters
  • 4 segments of

transmission line

Equivalent circuit

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Planar antennas Apertures in ground plane Transmission line

D CZ BY A D CZ BY A S       

11

Equivalent circuit

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  • Patch array  band-pass filter (BPF)
  • Synthesis of BPF  requested transmission characteristics

to be obtained

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        

      

2 A 11 A 21

1     S AF D S

Synthesis of filtering array

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  • Low-pass prototype: normalized element values

gn available to obtain requested characteristics

  • Band-pass antenna: coefficients re-computed comprising:
  • Required value of reflection coefficient
  • Acceptable level of fractional bandwidth

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Synthesis of filtering array

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HONG, J. S., LANCASTER, M. J., Microstrip Filters for RF/Microwave Applications, New York: J. Wiley and Sons, 2001. ISBN: 0-471-38877-7.

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Bandpass filter

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  • An example for 4 antenna elements,

|S11| < –10 dB and 0.08 < FBWs < 0.10

raida@feec.vutbr.cz

     

1 2 1 2

10 770 . 1 2 10 892 . 6 10 770 . 1 4 981 . 1 981 . 1             

 s

FBW FBW 1

5

  g g

1 1 2 2 4 1

10 143 . 3 10 173 . 1 10 354 . 1

         FBW FBW g g

1 2 2 3 2

10 708 . 3 759 . 1 10 257 . 3

        FBW FBW g g

       

2 A 11 A 21

1 S AF D S

Filtering array

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Transformace pásmová propust

                FBW

C 1 2

     FBW

2 1

    g FBW L

C S

            g FBW C

C S

1               g FBW C

C P

          g FBW L

C P

           

bandpass edge frequencies fractional bandwidth serial parallel

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  • Known normalized element values gn  values
  • f capacitances C and inductances L in equivalent

circuit can be computed

  • Known C and L  dimensions of planar equivalents

can be obtained

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Design

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f0 = 4.8 GHz; FBWs = 8 %; S11 < –15 dB

Test case 1

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f0 = 4.8 GHz; FBWs = 8 %; S11 < –15 dB

Test case 1

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f0 = 5.8 GHz; FBWs = 12 %; S11 < –10 dB

Test case 2

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f0 = 5.8 GHz; FBWs = 12 %; S11 < –10 dB

Test case 2

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f0 = 6.8 GHz; FBWs = 12 %; S11 < –20 dB

Test case 3

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f0 = 6.8 GHz; FBWs = 12 %; S11 < –20 dB

Test case 3

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Test samples

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f0 = 4.8 GHz; FBWs = 8 %; S11 < –15 dB

Test case 1

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f0 = 4.8 GHz; FBWs = 8 %; S11 < –15 dB E-plane H-plane

Test case 1

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f0 = 4.8 GHz; FBWs = 8 %; S11 < –15 dB

Test case 1

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f0 = 5.8 GHz; FBWs = 12 %; S11 < –10 dB

Test case 2

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f0 = 5.8 GHz; FBWs = 12 %; S11 < –10 dB E-plane H-plane

Test case 2

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f0 = 5.8 GHz; FBWs = 12 %; S11 < –10 dB

Test case 2

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f0 = 6.8 GHz; FBWs = 12 %; S11 < –20 dB

Test case 3

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f0 = 6.8 GHz; FBWs = 12 %; S11 < –20 dB H-plane E-plane

Test case 3

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f0 = 6.8 GHz; FBWs = 12 %; S11 < –20 dB

Test case 3

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  • Low-pass filter enforced to radiate:
  • 1. Fractal DGS antenna
  • Multi-objective synthesis in frequency and space:
  • 2. Dipole array
  • 3. SIW-fed patch array

Other filtenna concepts

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  • Filter parameters
  • Bandwidth (-3 dB): 5.7 %
  • S21 in pass band: ≈ -4.4 dB
  • S21 in stop band: ≈ -40.0 dB
  • S11 in pass band: ≈ -15.0 dB
  • Antenna parameters
  • Realized gain in pass band: ≈ 9.0 dB
  • Bandwidth (-10 dB): 1.7 %
  • Max. main lobe deflection (pass band): ≈ 5.0°

Fractal DGS

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Fractal DGS

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  • Frequency filtering
  • Impedance match: ̵ 10 dB (pass)
  • Gain response: 13.0 dBi (pass), 5.0 dBi (stop)
  • Spatial filtering
  • Sidelobe level: 6 dBi (pass), 2 dBi (stop)
  • Main lobe deflection:  5.0°

4NEC

Dipole array

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  • 4NEC: Pareto front of optimal solutions
  • Tuning space-mapping: CPU-expensive CST model

Dipole array

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Dipole array

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Dipole array

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Dipole array

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SIW array

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SIW array

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SIW array