Printed antennas for dual-band GSM/DCS 1800 mobilehandsets

Serrano-Vaello, A.; Sánchez‐Hernández, D.

doi:10.1049/el:19980215

Cited by 31 publications

(11 citation statements)

References 4 publications

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“…In [16], it is shown that the simultaneous use of slots and short-circuit vias allows to obtain a frequency ratio from 1.3 to 3 depending on the number of vias. Dualfrequency operation of the microstrip antenna with a spur-line filter embedded in the patch has also been reported in [17] where a frequency ratio of ∼2.0 between the two operating frequencies is shown. In such a dual-frequency scheme, the lower and higher operating frequencies are designed, respectively, at the resonant frequencies of a new resonant mode, generated by the perturbation of the embedded spur-line filter in the patch, and the T M 01 mode.…”

Section: Introductionmentioning

confidence: 69%

FDTD Analysis of a Dual-Frequency Microstrip Patch Antenna

Gao¹,

Li²,

Sambell³

2005

PIER

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Abstract-Characteristics of a single-layer, dual-frequency microstrip patch antenna, which uses a T-strip loaded rectangular microstrip patch, are studied. This antenna is easy to achieve good impedance matching at both frequencies by tuning the feed position and other design parameters. Another advantageous aspect is that it has high polarization purity. A detailed parameter study is performed and the theoretical analysis is based on the finite-difference time-domain (FDTD) method. The FDTD programs are developed and validated by measurement results. The effects of various antenna parameters on two resonant frequencies, frequency ratio, and radiation pattern characteristics of the antenna are analyzed and discussed. It is shown that various frequency ratios (1.5-2.49) can be obtained by varying the design parameters of this antenna. Similar radiation patterns with same polarization are obtained at two resonant frequencies. Several design curves are presented.

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Section: Introductionmentioning

confidence: 69%

FDTD Analysis of a Dual-Frequency Microstrip Patch Antenna

Gao¹,

Li²,

Sambell³

2005

PIER

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“…However, in modern communication systems, reduction in antenna size and dual frequency operation for mobile transceiver applications are important considerations. Dual frequency operation of the microstrip antenna with a spur-line filter-embedding patch has been reported in [1], where frequency ratio of ~2.0 between the two operating frequencies has been shown. In such dual frequency scheme, lower and higher frequencies are designed at the resonant frequencies of a new normal mode that is generated by the perturbation of the embedded spur-line filter in the patch and TM 01 mode.…”

Section: Introductionmentioning

confidence: 98%

Reduced sized dual frequency microstrip antenna

Bhunia

Sarkar

2009

Indian J Phys

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A novel, compact, single probe-feed square microstrip patch antenna for operation in dual frequency can be achieved by cutting unequal finger like rectangular slots perpendicular to the radiating edges. From the experimental results obtained, the proposed antenna is about 67% smaller compared to a traditional rectangular patch operating at the same frequency and we have got the dual frequency operation in two different bands i.e. L and S bands.

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“…On the other hand, due to the compactness of its size for a fixed operating frequency and the similarity of its radiation-pattern characteristics to those of a conventional rectangular patch antenna, the bowtie antenna has been proposed and much research has been conducted on it [8 -16]. The dual-frequency operation of the bowtie microstrip antenna with the spur-line filter technique [9], a shorting pin [10] and a pair of narrow slots close to the antenna's radiating edges [11] have been demonstrated. Moreover, the bowtie slot microstrip antenna is fed by CPW [12,13] and a tapered CPW feeding transition [14].…”

Section: Introductionmentioning

confidence: 99%

Design of a half-bowtie-shaped meander-type microstrip patch antenna for wide impedance bandwidth

Yoon

Kwak

2005

Microw. Opt. Technol. Lett.

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The Labview code also controls the capacitance of the varactors of the FSS through a reverse bias voltage provided by the analogue output of the DAQ card. The output of the latter can reach a maximum voltage of 10 V; hence, an operational amplifier circuit is employed to increase the output voltage to 15 V [see amplifier 1, Fig. 1(b)].The Labview code operates as follows: (i) it increases the FSS varactor voltage by small incremental steps (0.1 V); (ii) for every voltage value, the rectified transmitted signal is recorded; and (iii) the code sets the reverse bias voltage to the value that corresponds to the smallest rectified signal.Following a thorough calibration using a vector network analyser, the insertion loss of the waveguide setup was measured with and without the FSS panel. These measurements, shown in Figure 2(b), are required in order to determine whether the waveguide setup attenuation influences the smart FSS performance. The results demonstrate that the waveguide attenuation is approximately constant over the frequency range of interest.The rectifier's output voltage was then examined for various incident signal powers and frequencies, as it may also influence the smart FSS performance. The results are shown in Figure 2(c) for two input signal levels: Ϫ5 dBm and Ϫ20 dBm. There is a variation in the output voltage; however, it does not to affect the smart FSS performance. Figure 3 plots the transmitted signal power versus frequency for three different varactor reverse bias values: 0, 6.33, and 15 V. The plotted results were obtained using a spectrum analyser. The 6.33-V value was determined by the Labview code. Figure 3 confirms that this value is very near the optimum reverse biasvoltage value that most effectively blocks the incident 2.35-GHz signal. CONCLUSIONThis paper has provided proof of the concept that a smart FSS can be implemented through the use of a tunable frequency-selective surface and a PC. ACKNOWLEDGMENT This work was funded by

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Printed antennas for dual-band GSM/DCS 1800 mobilehandsets

Cited by 31 publications

References 4 publications

FDTD Analysis of a Dual-Frequency Microstrip Patch Antenna

FDTD Analysis of a Dual-Frequency Microstrip Patch Antenna

Reduced sized dual frequency microstrip antenna

Design of a half-bowtie-shaped meander-type microstrip patch antenna for wide impedance bandwidth

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