• Proceedings of the Korea Electromagnetic Engineering Society Conference
• /
• 2005.11a
• /
• pp.397-400
• /
• 2005

In this paper, folded PIFA is proposed by using folding the end point of PIFA for the automobile DMB antenna. By turning down the end point on the opposite side of shortstrip, resonance frequency is presented at not $\lambda$/4 but $\lambda$/10. So the folded PIFA has size reduction effect approximately 60 % as compared to the conventional PIFA. Also by using the parasitic patch, folded PIFA provides wide band performance. As a result, the designed antenna can be in the application of Digital Multimedia Broadcasting(180 $\sim$ 210 MHz) antenna for the automobile.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.28 no.8A
• /
• pp.591-597
• /
• 2003

In this paper, a compact and broadband PIFA(Planar Inverted F Antenna) which has an additive short-circuit plate along the patch length was designed. For more compact PIFA short-circuit Plate along the patch width is reduced and an additive short-circuit plate along the patch length is used to broaden the bandwidth. The effect of an additive-short-circuit plate along the patch length was verified in single band PIFA and also verified in dual-band PIFA. The commercial software, IE3D, was used to design a PIFA and its performance was verified by comparing simulated results with measurement results.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
• /
• v.1 no.1
• /
• pp.47-52
• /
• 2008

In this paper, the small PIFA with dual bandwidth using LTCC is the proposed. The proposed PIFA is designed and fabricated for dual resonance bands (K-PCS and WiBro). It consists of two layers. The bottom layer shape PIFA has 120MHz bandwidth (1.727 ~ 1.847 GHz), it satisfied K-PCS. The top layer shape stacked element has 110MHz bandwidth (2.302 ~ 2.412 GHz), it satisfied WiBro. The top layer is stacked on the bottom layer for electric coupling. Maximum radiation gain of K-PCS, WiBro bands are 2.11 dBi, 3.71 dBi respectively. For miniaturization of the antenna structure, the PIFA using LTCC ( ${\varepsilon}_r\;=\;8$ ) chip is fabricated. The proposed PIFA shows the effect of SAR reduction also. A defect that is fabricated by stacking up the layers in the design of PIFA is complemented by fabricated in using LTCC chip.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.14 no.8
• /
• pp.855-862
• /
• 2003

This paper suggests the PIFA structure modified antenna in which short-circuit plate is located between planar element and ground plane, in order to solve the problem of narrow band of existing internal antenna, PIFA. It is also suggested that internal antenna has the perturbation in the patch to broaden the frequency bandwidth. It is possible that the antenna is installed into the mobile telephone with a low profile condition(h=0.015 λ) to use internally, and acquired desired bandwidth(5.2 %) through double resonance structure, remodeling the PIFA that is already well-known as an internal antenna. This paper investigated how characteristic is affected by the feeding point(Yf, Zf), short strip plate(Zs), short strip width(Ws), perturbation width(w), length(d), short plate height(h), dielectric($\varepsilon$$\_$r/) to be slim type antenna. It is compared with existing PIFA bandwidth, and is suggested pattern as the H.E plane. It is simulated using the Microwave Studio of the CST Inc. based on FIM(Finite Integration Method) method and analyzed antenna characteristic following the variation each parameters. The result proved the practical use of PIFA antenna by comparing the measured and simulated data of the antenna.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.11 no.1
• /
• pp.46-54
• /
• 2000

In this paper, PIFA on PCS handset for SAR reduction is designed. According to the position of PIFA attached on the handset, side mounted PIFA and top mounted PIFA are suggested. Resonance characteristics with variety of design parameters are analyzed. And monopole antenna with $\lambda$/4 length is designed and compared with PIFAs in bandwidth and SAR. At 1.83 GHz center frequency, the bandwidth of side mounted PIFA and monopole antenna are 8.2% and 21.7%, respectively. The 1 g and 10 g peak average SARs of side mounted PIFA are 0.686 and 0.353 respectively, which are about 1/3 of SARs of monopole antenna, 1.759 and 0.978, respectively.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
• /
• 2001.11a
• /
• pp.132-135
• /
• 2001

본 논문에서는 SAR를 저감시킬 수 있는 IMT-2000 단말기용 PIFA의 설계에 대한 내용을 다루었다. 안테나의 설계 파라미터에 따른 공진 특성을 분석하고, PIFA와 동일한 공진 주파수를 갖는 모노폴 안테나와 Side-mounted PIFA를 설계하여 공진 특성과 SAR를 비교\ulcorner분석하였다. 그 결과 중심주파수에서 PIFA의 대역폭은 213MHz로 Side-mounted PIFA보다 50MHz로 증가하였고, 모노폴 안테나와 비교시에는 87MHz정도 감소하였다. 또한, 1g 및 10g SAR 평균 첨두치는 PIFA가 0.9869, 0.453 으로 Side-mounted PIFA, 모노폴 안테나에 비해 각각 10.3 %, 50% 감소하였다.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
• /
• 2002.11a
• /
• pp.232-236
• /
• 2002

In this paper, a new compact PIFA, applicable to PCS system, is described. The central aim in design is to broaden the bandwidth within limited height of mobile phones. To overcome the narrow bandwidth characteristics, which is typical of a patch antenna, tapered type radiation patch is employed. The antenna is designed using CST microwave studio and its characteristics are compared with a basic PIFA with similar volume.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.17 no.3 s.106
• /
• pp.280-286
• /
• 2006

Determination method of optimum feeding point for the PIFA type internal antenna for the mobile phone handset was studied. Fundamental theory is that radiated gain is basically depended upon the electric field strength between PIFA conductor and ground plane. Feeding point, slit configuration, material and structure of carrier are main factors fur the PIFA performances. It is shown that maximum electric field strengths of other feeding points decrease in -2dB to -10 dB than optimum point. Ansoft HFSS EM simulator was applied to determine the best feeding point for 2 models of Samsung Electronics mobile phone handset.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.16 no.1 s.92
• /
• pp.66-77
• /
• 2005

This paper proposed a novel broadband PIFA(Planar Inverted-F Antenna) for IMT-2000/WLAN/DMB terminal. Two branch lines for meander line were utilized in order to improve the characteristics of PIFA which usually has a narrow band. The shorting strip between the ground plane and meander-type radiation elements were used in order to minimize the size of the antenna. The -10 dB return loss bandwidth of a realized antenna was $38.2{\%}$(1.84~2.71 GHz), which contains the broadband bandwidth with triple band. And the simulated and measured values of 1 g and 10 g averaged peak SAR on human head caused by the triple band PIFA mounted on folder-type handsets were analyzed and discussed. As a result, the measured 1 g and 10 g averaged peak SARs of PIFA were similar with the simulated values and were lower than the 1.6 W/kg and 2 W/kg of 1 g and 10 g averaged peak SAR limits.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.18 no.12
• /
• pp.1337-1344
• /
• 2007

It is shown that inverted ${\pi}$ feeder affects the gain improvement for the internal antenna of mobile phone. Generation of current on the inverted ${\pi}$ feeder, by the modification of conventional feeding structure for the PIFA and IFA, can apply T matching theory to the new feeder. Therefore, inverted ${\pi}$ feeder based on the T matching theory makes higher radiation resistance, and also increases the gain. To verify inverted ${\pi}$ feeding effect, feeder is applied to GSM/DCS dual band conventional PIFA, and measured return loss and patterns. By measurement, it's shown that this new feeding antenna has $0.23{\sim}0.84$ dB higher average gain for GSM band and $0.01{\sim}1.74$ dB higher average gain for DCS band than conventional fed PIFA without resonant frequency change.