Bandwidth enhancement in noncentered stacked patches

Rajo‐Iglesias, Eva; Segovia-Vargas, D.; Vazquez-Roy, Jose Luis; González-Posadas, V.; Martín-Pascual, C.

doi:10.1002/mop.1355

Cited by 19 publications

(6 citation statements)

References 4 publications

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“…5), it can be seen that as the linear displacement increases, the 10-dB impedance bandwidth is reduced with a corresponding slight decrease in the mean frequency of the band. Thus our results shown here contradict the results reported in [4,5], which used low-low dielectric material as the substrates, as the resonant frequencies of the antenna are further separated when displacement increases and a mismatch becomes serious in the central frequency band. Figure 6 shows the effect on S 11 caused by angular displacement at the origin, 0 ѯ 0°and the combination of linear and angular displacements at 4 ѯ 270°.…”

Section: Experimental Results For the Displacementscontrasting

confidence: 99%

“…They considered square patches of same size in the S band, printed on PVC substrates of r ϭ 3. However, the results in [4,5] cannot confirm the authors' claims of impedance bandwidth enhancement by offsetting the smaller top-patch. The reported results and Figures in [4] and [5] do show formation of a narrow dual-band due to the separation of the two resonant frequencies.…”

Section: Introductioncontrasting

confidence: 72%

“…Nonetheless, the effects of the deliberate patch offset or unavoidable layer misalignment on the obtainable broadband characteristics for the EMCP structure proposed in [6] have not been reported so far. Recently, Rajo-Iglesias et al reported on the effects of patch offset on the input impedance behavior and bandwidth enhancement for a conventional EMCP structure without an airgap between layers [4,5]. They considered square patches of same size in the S band, printed on PVC substrates of r ϭ 3.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The effect of offset patch on the broadband characteristics of an electromagnetically coupled patch antenna

Chung

Mohan

2003

Micro & Optical Tech Letters

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Section: Experimental Results For the Displacementscontrasting

confidence: 99%

Section: Introductioncontrasting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effect of offset patch on the broadband characteristics of an electromagnetically coupled patch antenna

Chung

Mohan

2003

Micro & Optical Tech Letters

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“…This is especially interesting when a prefixed stop-band is needed and, in particular, if there are any kind of constraints in reference to the available materials or other design parameters [6]. This software has been developed in MATLAB.…”

Section: Effect Of the Human Head On The Antenna Characteristicsmentioning

confidence: 99%

Dielectric electromagnetic band gap design with genetic algorithm

Rajo‐Iglesias

Sanabria‐Martínez

Fernández-Villacañas

2005

Micro & Optical Tech Letters

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distance d Ͼ 20 mm, the antenna effect could be negligible. It should also be noted that taking the effect of the human head into account is certainly justifiable and, depending on the operating frequency.Also from Figure 5, it is found that most of the investigated antenna shapes have acceptable SAR less than 1.6 W/Kg (IEEE standard). The best shapes are quad-band PIFA without and with fractal concept. Their SAR values equal 0.48 and 0.6 W/Kg, respectively. These values are much better than several mobile antennas in the market (such as Motorola V3688) with SAR of 1.91 W/Kg. Effect of the Human Head on the Antenna CharacteristicsIn this section, we summarize some of the results reported on the electrical characteristics for antennas in handheld devices. There may be a reduction in gain and change in the level of side lobes, as the antenna moves closer to the head. We can summarize these effects in the following points.1. The frequency is shifted down due to the presence of the human head. The maximum shift is 6%, but most of the antennas still operate in resonating band. This can be attributed to the coupling between the antennas and the human head. 2. The reflection coefficient of the antenna is increased, but the antenna is still matched for the most part. 3. The antenna-radiation efficiency is reduced due to the amount of the absorbed power in the human body. 4. The bandwidth is reduced by about 3% on average, but most antennas still operates with acceptable bandwidth. 5. The antenna directivity is reduced by about 4 dB on average. 6. The far-field radiation pattern is distorted. The front-to-back ratio is reduced. The pattern shape has some unpredictable changes, depending on the antenna position, orientation, and polarization directions. Figure 1. The rods or holes are placed to form a specifically shaped lattice (for example, square or triangular). These 2D structures need to be electrically small in their third dimension for application in the antenna. An EBG structure has several forbidden bands, but most applications use only the first one. To design a 2D EBG structure with a prefixed frequency band-stop, it is possible to consult an atlas of band diagrams [2], which are not available for every structure. Otherwise, the structure must be simulated with an appropriate software which requires a trial-and-error process to obtain the desired solution.In this work, we present a software that uses a genetic algorithm (GA) with a heating and cooling process to provide the design solution for a specific requirement and, if desired, includes constraints with regard to materials, dimensions, and so forth. This is especially interesting when a prefixed stop-band is needed and, in particular, if there are any kind of constraints in reference to the available materials or other design parameters [6]. This software has been developed in MATLAB. ANALYSIS METHODPreviously, to develop a program that includes an optimization process, it was necessary to create one's own MATLAB software that was able to analyze 2D diele...

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“…An alternative widely employed broadening technique is to use multiple resonances introducing additional resonant patches. In this respect, stacking microstrip elements can be used [7,8] and bandwidth of 10% to 20% can be obtained.…”

Section: Introductionmentioning

confidence: 99%

Bandwidth enhancement of a microstrip antenna using negative inductance as impedance matching device

Kaya

Kılınç

Yüksel

et al. 2004

Micro & Optical Tech Letters

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In this study, a novel technique for bandwidth enhancement of a microstrip antenna with a floating negative inductor matching network is presented. A compensation network consisting of three gallium-arsenide field effect transistors is employed at the input of a microstrip antenna operating at 10 GHz. The performance parameters of the designed microstrip antenna with and without compensation network are compared. The simulation results show that compensation network can improve the bandwidth from 17.21% to 32.67%.

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Bandwidth enhancement in noncentered stacked patches

Cited by 19 publications

References 4 publications

The effect of offset patch on the broadband characteristics of an electromagnetically coupled patch antenna

The effect of offset patch on the broadband characteristics of an electromagnetically coupled patch antenna

Dielectric electromagnetic band gap design with genetic algorithm

Bandwidth enhancement of a microstrip antenna using negative inductance as impedance matching device

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