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    Phase Shifter Design

    Uploaded by

    Ahmad Bilal
    This document describes the design of a reflection type phase shifter using a substrate integrated waveguide (SIW) coupler. It discusses using a double-layer SIW structure with two ports and a variable load to implement a phase shifter without a power divider. It also explores optimizing the coupler slot geometry, including effects of slot length, width, offset and rotation on bandwidth, isolation, and coupling fluctuation. The best design achieved a 36.5% bandwidth and over -15dB isolation using a rectangular main slot with a single cross slot.

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    © All Rights Reserved
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    Phase Shifter Design

    Uploaded by

    Ahmad Bilal
    13 views50 pages
    This document describes the design of a reflection type phase shifter using a substrate integrated waveguide (SIW) coupler. It discusses using a double-layer SIW structure with two ports and a variable load to implement a phase shifter without a power divider. It also explores optimizing the coupler slot geometry, including effects of slot length, width, offset and rotation on bandwidth, isolation, and coupling fluctuation. The best design achieved a 36.5% bandwidth and over -15dB isolation using a rectangular main slot with a single cross slot.

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    This document describes the design of a reflection type phase shifter using a substrate integrated waveguide (SIW) coupler. It discusses using a double-layer SIW structure with two ports and a variable load to implement a phase shifter without a power divider. It also explores optimizing the coupler slot geometry, including effects of slot length, width, offset and rotation on bandwidth, isolation, and coupling fluctuation. The best design achieved a 36.5% bandwidth and over -15dB isolation using a rectangular main slot with a single cross slot.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    13 views50 pages

    Phase Shifter Design

    Uploaded by

    Ahmad Bilal
    This document describes the design of a reflection type phase shifter using a substrate integrated waveguide (SIW) coupler. It discusses using a double-layer SIW structure with two ports and a variable load to implement a phase shifter without a power divider. It also explores optimizing the coupler slot geometry, including effects of slot length, width, offset and rotation on bandwidth, isolation, and coupling fluctuation. The best design achieved a 36.5% bandwidth and over -15dB isolation using a rectangular main slot with a single cross slot.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    of 50

    Phase Shifter Design

    Reflection Type Phase Shifter


    • Components:
    • Coupler
    • Variable Load Variable Impedance
    Coupler
    • Microstrip line Coupler

    Port 1 is input port


    Port 2 and 3 are 90° out of phase
    Port 4 is isolated

    • Latest studies: Substrate Integrated


    Waveguide (SIW) based couplers
    • Substrate Integrated Waveguide (SIW):

    • SIW based coupler (Single Layer):


    3 Transmit

    Recent study: TAP 2019


    • Antenna integrated with phase
    shifter using multilayer SIW 1
    Input Signal
    • Drawbacks:
    • Low bandwidth
    • Single port (As the signal is directly
    transmitted after phase shift)

    2
    Phase shift
    (Variable Impedance)
    Structure
    • We do not need power divider
    • We need two ports on a double layer SIW

    Variable Load

    Port 3 Output

    Input Port 2

    Vias Short Circuit Termination

    Side View
    Output
    Slots for Sh
    Variable load placement or
    tc
    irc
    uit
    us
    ing
    Sh via
    or s
    tc
    irc
    uit
    us
    ing
    via
    s
    This slot couples both layers
    Input
    GCPW to SIW Transition
    1. GCPW
    GCPW to SIW Transition
    2. GCPW with Tapering
    GCPW to SIW Transition
    3. GCPW with Tapering and Bend

    Loss
    GCPW to SIW Transition
    4. GCPW with Tapering, Bend and Vias

    Loss
    GCPW to SIW Transition
    5. GCPW with Tapering and Vias

    Loss (Problem is in the bend)


    GCPW to SIW Transition
    6. Troubleshooting
    GCPW to SIW Transition
    6. Final Design
    Optimizing Coupler Slots
    Optimizing Coupler Slots

    Single slot coupler


    Optimizing Coupler Slots

    2nd slot taking over


    Optimizing Coupler Slots

    7
    Slot
    Effect of Slot1 Length Effect of Slot2 Length

    Effect of Slot1 Width Effect of Slot2 Width


    Effect of Slot1 Offset Effect of Slot2 Offset
    Air filled waveguide
    Single slot
    Transverse Slot Coupler
    BW = 35%
    Full Device Simulation

    BW = 33%
    BW = 36.5%

    Isolation -10.6dB
    36.9%
    Final Device BW = 36.9% Isolation = -11.4dB Coupling Fluctuation = 0.85dB
    Improving Isolation
    Single slot  Good isolation
    Very narrow slot2. Isolation degraded. Why?
    Isolation Vs slot length

    Best isolation = worst fluctuation


    Rotation angle trades between fluctuation and isolation

    Slot rotated 45°


    Cross Slot
    15
    Effect of cross rotation
    45 degree gives best isolation
    Rectangular + 1 cross slot
    BW = 33.6% Isolation = -13.3dB
    BW = 34% Isolation = -14.3dB
    BW = 35% Isolation = -14.6dB
    BW = 35% Isolation = -15dB
    BW = 36.5% Isolation = -15dB

    Coupled & Through

    36% Bandwidth

    S11 Isolation = max(-15dB)

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