Review of Theory, Fabrication, and Applications of High‐Impedance Ground Planes

Engheta, Nader; Ziolkowski, Richard W.

doi:10.1002/0471784192.ch11

Cited by 19 publications

(18 citation statements)

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“…3.4, as L =1.86 nH and C =0.628 pF, respectively. These values are consistent with, but not exactly the same as, the theoretical values [22], [29]. The dielectric loss of the substrate was represented as the loss resistance calculated by R loss = 1/ωC tan δ, which gives R loss = 11 kΩ and 5.5 kΩ at 1 GHz and 2 GHz, respectively.…”

Section: Equivalent Circuit Analysissupporting

confidence: 81%

Imaging Radio-Frequency Power Distributions by an EBG Absorber

Yagitani

Keigo

Nojima

et al. 2011

IEICE Trans. Commun.

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SUMMARYA thin electromagnetic band-gap (EBG) absorber is employed to capture the 2-d image of radio-frequency (RF) power distribution. The EBG absorber consists of an array of mushroom unit cells formed on a thin dielectric substrate with a metal backplane, and lumped resistors interconnecting the surface patches of the mushrooms. Around the resonance frequency at which the EBG structure acts as a high-impedance surface, the RF power incident on the surface is absorbed by the lumped resistors which are matched with the incident wave impedance. By detecting directly the amounts of power consumed by the individual resistors, an "RF power imager" can be constructed which captures the 2-d distribution of the RF power illuminating the EBG surface, where polarization discrimination is possible. The resonance (i.e., absorption) frequency is made tunable by adding varactor diodes in parallel with the lumped resistors. The EBG absorber tunable in the frequency range of 700 MHz-2.7 GHz is designed and fabricated, and its performance is evaluated by an equivalent-circuit analysis, simulation and measurement. It is shown that the small resistance of the varactors have a considerable effect on the absorption performance. RF power distributions radiated from a dipole antenna are successfully measured by a matrix of sensitive power detectors installed on the backside of the absorber. Using such an RF power imager, the power distributions of even impulsive RF signals and/or noises can be captured and visualized in situ and in real-time, while the electromagnetic environment is almost undisturbed by the EBG absorber.

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Section: Equivalent Circuit Analysissupporting

confidence: 81%

Imaging Radio-Frequency Power Distributions by an EBG Absorber

Yagitani

Keigo

Nojima

et al. 2011

IEICE Trans. Commun.

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“…Gain can be improved or maximized by either increasing the [14] etc.. These techniques are complex and antenna with these techniques will have integration problems in PCB's.…”

Section: Configuration Of Partial Ground and Parasitic Patchesmentioning

confidence: 99%

“…In literatures [10][11][12][13][14][15] several methods have been discussed for the suppression or cancellation of surface waves like high impedance ground structures, defected ground techniques etc.. In this paper instead of suppressing or cancelling the surface waves, they are provided with an in phase excitation by introducing parasitic patches (as shown in Fig.…”

Section: Configuration Of Partial Ground and Parasitic Patchesmentioning

confidence: 99%

“…In order to overcome above mentioned deficiency the thickness of the substrate should be more then quarter wave length. Though by increasing the substrate thickness the destructive interference will reduce but because of Perfect Electric Conductor (PEC) ground some of the waves will continue to propagate along the PEC ground and get radiated through substrate-ground discontinuity which in turn gives rise to surface wave problems as mentioned in [10,14].…”

Section: Introductionmentioning

confidence: 99%

“…Various techniques as reported in [10][11][12][13][14][15] are proposed for either suppression or providing an in phase excitation of the surface waves.…”

Section: Introductionmentioning

confidence: 99%

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High Gain and Low Cross-Polar Compact Printed Elliptical Monopole Uwb Antenna Loaded With Partial Ground and Parasitic Patches

Reddy¹,

Mishra²,

Kharche³

et al. 2012

PIER B

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Abstract-In this paper a low cost, high gain, low cross-polar and compact edge feed printed elliptical antenna with a partial ground plane and parasitic patches is proposed and investigated. The proposed antenna is fabricated on a 1.6 mm thick FR4 substrate with dielectric constant of 4.4 and loss tangent of 0.025. The total planar area of the proposed antenna (L × W ) is 28 × 24 mm 2 . Both the simulated and experimental result shows that the proposed antenna provides a frequency range compatible with the ultra-wideband (UWB) standard, i.e., 3.5 GHz-12 GHz frequency band. The radiation pattern produced by the proposed antenna is approximately omnidirectional with inphase excitation of Surface waves resulting in less cross-polarization level (less than 20 dB) compared to its co-polar component for the entire impedance band width. The maximum measured gain for the fabricated antenna is around 6.27 dBi with an average efficiency of above 90% throughout the bandwidth. A linear phase response (phase of S 21 ) accompanied by a constant group delay of 1 ns throughout the measured bandwidth makes the proposed antenna a good candidate for UWB applications.

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