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Antenna Theory Lab #1Spring ‘16

Anthony Trautman

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Objective

• Design and simulate a printed strip dipole antenna

• 1 Ghz (lambda = 30 cm)

•

Greater than 17.5 dB return loss• 1.6mm substrate

• Design parameters to vary

• Length

• Width

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Substrate Defined

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Antenna Layout

132 mm

65 mm

4x5 mm

20 mm

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Design Approach and Results

The design approach was not very elegant but was effective. It was know that the overall length of the antenna needed

to be approximately 0.5 lamba (150 mm) and the width should not exceed 0.1 lamda (30 mm). Given these numbers as

starting point a trial and error approach was used to zero in on dimensions that met the design requirements of greater

than 17.5dB return loss @ 1GHz. The antenna dimensions achieved a 36.5 dB return loss.

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Design Approach and Results

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Input Impedance

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Lossy Substrate Results

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Current Density Visualization @ 1GHz

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Resonance at 2.5GHz

The resonance at 2.5 GHz (near 3GHz) at λ/2 cycles. This antenna will resonate at all k* λ /2 points.

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Current Density Visualization @ 2.5GHz

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High contrast Substrate

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Antenna Layout

132 mm

65 mm

4x5 mm

20 mm

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High Contrast Substrate Results

Adding the high contrast substrate significantly altered the resonant frequency and bandwidth of the original design.

This was expected as any material being put in close proximity with an antenna.

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High Contrast Substrate Results

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High Contrast Substrate Results

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High Contrast Substrate Results

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Lossy Substrate

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Antenna Layout

132 mm

65 mm

4x5 mm

20 mm

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Lossy Substrate Results

The lossy substrate moved the resonant frequency down 7 MHz and the return loss lost 0.2dB. These results were

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Lossy Substrate Results

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Lossy Substrate Results

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Lossy Substrate Results