• Journal of electromagnetic engineering and science
• /
• 제11권3호
• /
• pp.201-206
• /
• 2011

This paper presents a miniaturized epsilon negative (ENG) zeroth-order resonance (ZOR) patch antenna with an improved bandwidth. The miniaturization and the broad bandwidth of the ENG ZOR patch antenna are achieved by using a meandered via and a high permeability substrate instead of a straight via and a dielectric substrate. The use of a meandered via allows miniaturization of the ENG ZOR patch antenna without narrowing the bandwidth. The use of a high permeability substrate allows further miniaturization of the ENG ZOR patch antenna and improvement of the bandwidth. A high permeability substrate consisting of a multi-layered substrate is designed to have a small material loss. The antenna (kr=0.32) has a 10 dB fractional bandwidth of ~1 %, which is 1.74 times as broad as that of an antenna with a dielectric substrate.

• Journal of electromagnetic engineering and science
• /
• 제15권2호
• /
• pp.120-122
• /
• 2015

This study presents a new, simple method for improving the front-to-back (F/B) ratio of a microstrip patch antenna (MSA) based on surface wave suppression. The back radiation of the MSA is significantly reduced by using the meandered ground plane edges and placing split-ring resonators (SRRs) in the middle of the meandered slots. By loading SRRs near the center of the meandered ground plane edges, some parts of the diffracted back-lobe power density can be reduced further. Compared to the F/B ratio of a conventional MSA with a full ground plane of the same size, an improved F/B ratio of 18 dB has been achieved experimentally for our proposed MSA.

• 한국전자파학회논문지
• /
• 제19권8호
• /
• pp.920-926
• /
• 2008

본 논문에서는 확장된 대역폭을 갖는 소형 epsilon negative(ENG) zeroth-order resonance(ZOR) 안테나를 제안하였다. 대역폭을 유지하고 ENG ZOR 안테나의 면적을 줄이기 위해서 안테나 패치 위에 패턴을 새겼고 meandered via를 삽입함으로써 매우 큰 병렬 인덕턴스를 발생시켰다. 동일한 면적, 공진 주파수에서 동작하는 ENG ZOR 안테나에 직선 via 대신 meandered via를 삽입하게 되면 유효 유전율의 분포의 기울기가 공진 주파수 근방에서 더 낮아지고 따라서 대역폭은 넓어진다. 결과적으로 제안한 meandered via를 가진 ENG ZOR 안테나는 직선 via를 가진 나선 구조 ENG ZOR 안테나와 동일한 면적을 가짐에도 불구하고 1.38배의 대역폭을 가지고 있는 것을 확인하였다. 또한, meandered via를 가진 ENG ZOR 안테나는 일반적인 mushroom ZOR 안테나보다 64 %의 면적감소를 보였다.

• 한국정보통신설비학회:학술대회논문집
• /
• 한국정보통신설비학회 2007년도 학술대회
• /
• pp.427-431
• /
• 2007

Applications in present-day mobile communication systems particularly require miniaturized dimensions and low-profiles of antenna in order to meet the mobile units. Thus, size reductions and bandwidth enhancements are becoming crucial design considerations for practical applications of microstrip antennas. The motivation of further experiments have been stepped to follow those studies for achieving compact and broadband, even multiplied operation modes, which are greatly increased with much attentions recently. To obtain broadband, single-feed, circularly polarized characteristics of microstrip antennas, a design with feed-line ought to be a factor of two. Usually, diagonally balanced-line feeds with hybrid coupler are employed to attain circular polarizations. We firstly formulated DGS (Defected Ground Structures) based operation principles of the entire microstrip components and therefore were able to derive impedance variance of feed-lines. After verifying corresponding experimental results, we targeted the frequency bands of UHF RFID (Ultra High Frequency Radio Frequency IDentification) and approximately of 0.4-2.4GHz have exhibited remarkable two resonance amplitudes as a dual band antenna. Our secondary researches were aimed to design quad band microstrip antenna which represents four resonance characteristics within the identical frequency bands as well. Microstrip patch has been meandered to lengthen the electrical paths, and the other design criteria with respecting physical parameters including radiation patterns and impedance bandwidths measurements will be described for verification. Advisable applications of these antennas can be GSM850, GSM900, GPS (L1-1575 and L2-1227) and UMTS-2110 of cellular systems, which extremely desire multiband and minimum size.

• 전기학회논문지
• /
• 제66권6호
• /
• pp.923-926
• /
• 2017

In this study, a novel wideband conformal thin antenna is presented for endoscopic capsule application at the 915 MHz Industrial, Scientific and Medical (ISM) band. The thickness of the antenna is only 0.2 mm which can be wrapped inside a capsule's inner wall. By cutting meandered slots on patch, open end slots on ground and utilizing long arm, the proposed antenna can obtain significant size reduction. The net volume of the proposed antenna including substrate and superstrate is only $37.4mm^3$ ($187mm^2$ surface area). This conformal antenna has shown good performance through simulation and measurement with maximum gain of -23 dBi and wide bandwidth from 137 MHz - 205 MHz depending on different environment. In addition, the effect of internal materials specially metallic battery is discussed briefly.

• 한국전자파학회논문지
• /
• 제13권7호
• /
• pp.633-640
• /
• 2002

본 논문에서는 이중공진 칩 meander 안테나를 제안하였다. 제안된 안테나는 기존 meander 안테나의 소형화 특성을 유지하면서 인접한 주파수에서 이중공진하는 특징을 갖는다. LTCC-MLC 공정을 이용하여 제작하였고, 2.20 GHz와 2.883 GHz에서 이중공진(주파수비=1.35)하며, meander 패치의 크기는 15.7 mm $\times$ 6.52 mm( 0.32 λg $\times$ 0.133 λg)이다. 그리고 이중공진 meander 안테나의 추가적인 소형화를 위해 3차원 구조를 제안한다. 이 3차원 구조를 이용하여 약 50 %의 크기를 추가적으로 소형화하였다. 전류분포를 통해 제안된 안테나가 이중공진하는 원리를 확인하였고, 제작된 안테나의 반사손실 및 방사패턴의 특성을 분석하였다.

• 한국정보통신학회:학술대회논문집
• /
• 한국정보통신학회 2016년도 춘계학술대회
• /
• pp.77-78
• /
• 2016

본 논문에서는 소형 WLAN 안테나에 적용 가능한 안테나 설계를 설계하고 적용 가능성을 검토하였다. 제안된 안테나는 $20mm{\times}60mm$ 크기의 RF4 기판(비유전율 4.4, 두께 1.6 mm, 손실탄젠트 0.025) 위에 $20mm{\times}20mm$ 크기 이내로 마이크로스트립 패치 안테나를 인쇄하였다. 안테나 파라미터는 OpenFDTD 시뮬레이터를 사용하여 계산하였다. 계산 결과로서 WLAN 사용대역 2.4-2.48GHz을 고려할 때 정재파비가 2 이하인 주파수 대역은 1.82-3.05GHz(1.23GHz, 44.6%)로 나타났다.