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Design and measurements of an electrically small, broad bandwidth, non-Foster circuit-augmented protractor antenna
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10.1063/1.4736996
/content/aip/journal/apl/101/2/10.1063/1.4736996
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/2/10.1063/1.4736996
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Passive, 50 Ω, 300 MHz protractor antenna. (a) Side view. All dimensions are in mm. (b) Simulated and measured |S11| values.

Image of FIG. 2.
FIG. 2.

Passive frequency agile protractor antenna system. (a) |S11| values versus frequency as the capacitance across the NFRP gap varies from 1.6 pF (m1, fr  = 196.9 MHz, |S11| = −32.2 dB) to −0.6 pF (m2, fr  = 395.8 MHz, |S11| = −18.6 dB), and (b) the corresponding simulated resonance frequency and radiation efficiency values.

Image of FIG. 3.
FIG. 3.

Revised floating two-port NIC circuit for our protractor antenna. R1 = 85.6 Ω, R2 = 298 Ω, R3 = 4.3 kΩ, R4 = 68.1 kΩ, R5 = 82 Ω, R6 = 583 Ω, C = 82 pF, C1 = 6.8 pF, C2 = 82 pF, C3 = 82 pF, C4 = 82 pF, C5 = 10 nF, L = 220 nH, L1 = 11 nH, L2 = 82 nH, L3 = 330 nH, TL1 = 1 mm, TL2 = 2.5 mm, TL3 = 9.5 mm, TL4 = 6 mm, TL5 = 1 mm, TL6 = 8 mm, TL7 = 22 mm, and V_DC = 7.97 V. The width of all transmission lines is 1 mm.

Image of FIG. 4.
FIG. 4.

NIC-augmented protractor antenna. (a) 5-port ADS Momentum simulation model, and (b) front view and (c) back view of the fabricated system.

Image of FIG. 5.
FIG. 5.

Simulated and measured |S11| values versus frequency for the non-Foster circuit augmented protractor antenna.

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/content/aip/journal/apl/101/2/10.1063/1.4736996
2012-07-13
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Design and measurements of an electrically small, broad bandwidth, non-Foster circuit-augmented protractor antenna
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/2/10.1063/1.4736996
10.1063/1.4736996
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