• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.16 no.10 s.101
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• pp.973-981
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• 2005

A modified half wavelength loaded line antenna is designed and implemented for mobile terminal applications. The antenna is constructed with a radiating element of half wavelength loaded line structure, dielectric substrate, feeding post and two shorting posts on the experimental PCB. The shorting posts are located at each side of the radiating element and lumped inductance elements are on between each shorting post and ground of PCB. By controlling value of inductors, one can adjust resonant frequency and input impedance respectively. Within inductance value of 12 nH, the antenna can have wide operating range of $1,470\~2,660\;MHz$ and good impedance matching. The measured peak gains are between -0.45 dBi and 2.03 dBi for the operating band.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.5
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• pp.792-797
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• 2006

In this paper, an internal integrated microstrop patch for PCS handset is designed. To increase the bandwidth of microstrip patch antenna, a configuration of stacked type using parasitic element is used. Furthermore, to reduce the size of microstirip patch antenna, the main radiator in the substrate is shorted to the ground plane using five shorting-posts while three parasitic elements on the superstrate are also shorted to the ground plane using two shorting-posts respectively. The antenna bandwidth and radiation characteristics are calculated by HFSS 7.0 software, and compared with the experimental results. Experimental results show that the return loss is less than -10dB over the band of 1766MHz to 1900 MHz(134MHz) and the size of the fabricated microstrip patch antenna are $23\times20\times6.35mm$.

• Proceedings of the IEEK Conference
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• 2003.07a
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• pp.625-628
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• 2003

In this paper, a wideband two-layer H-shaped microstrip antenna for WLAN is designed and studied experimentally. To increase the bandwidth of microstrip patch antenna, a configuration of stacked type using parastic element is used, Furthermore, to reduce the size of microstrip patch antenna, the first technique is H-shaped patch type. the second technique is that the main radiator and parastic patch are shorted to the ground plane using ten shorting posts. The antenna bandwidth and radiation characteristics are calculated by ENSEMBLE ver. 5.0 simulation software, and compared with the experimental results, Experimental results show that the return loss is less than -10dB over the band of 5.086GHz to 5.832GHz, which is quite good agreement with the calculations.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.41 no.3
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• pp.173-173
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• 2004

In this paper, a wideband two-layer H-shaped microstrip antenna for WLAN is designed. To increase the bandwidth of microstrip patch antenna a configuration of stacked type using parastic element is used. Furthermore, to reduce the size of microstrip patch antenna, two techniques are employed . the first one is H-shaped patch type and the second one is that the main radiator and parastic patch are shorted to the ground plane using ten shorting posts. The antenna bandwidth and radiation characteristics are calculated by ENSEMBLE ver. 5.0 simulation software, and compared with the experimental results. Experiment results show that the bandwidth of antenna in 740㎒ centered at 5.46㎓(13.5%), which is close agreement with the calculations, 770㎒(13%). Also, the antenna size can be reduced by 71.5% compared with the half wavelength rectangular microstrip antenna using the same substrate at the same frequency.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.18 no.8
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• pp.866-872
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• 2007

In this paper, we present a frequency tunable and compact antenna which consists of a first-order Peano curve, two shorting posts, and two inductors which are serially connected between the posts and the edge of the Peano curve. By properly choosing the inductance of two inductors, the operating frequency of the antenna can be controlled without sacrificing the fractional bandwidth. To give good demonstration of the operating mechanism, the equivalent circuit of this antenna is included. To validate the simulation results, we have fabricated the several antennas of being integrated with different inductors, and the measured results show a good agreement with the simulated ones. The measured results reveal that the operating frequency is shifted from 1.47 GHz to 0.586 GHz without the decrease of the input impedance bandwidth. In case of integrating two inductors of 91nH and 470nH, the electric size of the antenna is only $0.0246 {\lambda}{\times}0.0246{\lambda}{\times}0.0114{\lambda}$. The measured fractional bandwidth$(S_{11}{\leq}-10 dB)$ and the radiation efficiency of the antenna are 5.22% and 47.25%, respectively.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.41 no.3
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• pp.15-20
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• 2004

In this paper, a wideband two-layer H-shaped microstrip antenna for WLAN is designed. To increase the bandwidth of microstrip patch antenna a configuration of stacked type using parastic element is used. Furthermore, to reduce the size of microstrip patch antenna, two techniques are employed . the first one is H-shaped patch type and the second one is that the main radiator and parastic patch are shorted to the ground plane using ten shorting posts. The antenna bandwidth and radiation characteristics are calculated by ENSEMBLE ver. 5.0 simulation software, and compared with the experimental results. Experiment results show that the bandwidth of antenna in 740MHz centered at 5.46㎓(13.5%), which is close agreement with the calculations, 770MHz(13%). Also, the antenna size can be reduced by 71.5% compared with the half wavelength rectangular microstrip antenna using the same substrate at the same frequency.