• 한국전자파학회:학술대회논문집
• /
• 한국전자파학회 2001년도 종합학술발표회 논문집 Vol.11 No.1
• /
• pp.106-110
• /
• 2001

In this paper, a broadband sleeve monopole antenna using a loading coil in sleeve is proposed. The antenna of the proposed structure has the same of the single sleeve monopole antenna, except for using the coil instead of the inner conductor in sleeve. As a result, it is found that the bandwidth is 1.239～2.154 GHz(above 53.9%) for S$\sub$11/=-10dB(VSWR<2), and the antenna impedance is good for a communication system and feeder which the impedance has 50$\Omega$.

• 한국전자파학회논문지
• /
• 제26권8호
• /
• pp.710-717
• /
• 2015

본 논문에서는 철도 통신 환경에서 신뢰성 있는 초고속 통신을 위해 3개의 소자로 구성된 패치형 ESPAR(Electronically Steerable Parasitic Array Radiator) 안테나를 기반으로 한 배열 안테나 구조를 설계하였다. ESPAR 안테나는 단일 RF-체인을 가지는 능동소자와 능동소자를 둘러싼 기생소자들로 구성되며, 기생소자들의 리액턴스를 조절하여 빔포밍이 가능하다. 패치형 ESPAR 안테나 기반의 수직 배열 안테나 구조를 제안하고, 안테나 행간 거리와 안테나 수에 따라 시뮬레이션을 하였다. 시뮬레이션 결과, 안테나 행간 거리가 ${\lambda}$일 때 가장 큰 빔의 이득과 지향성을 가지는 것을 확인할 수 있다.

• 한국전자파학회논문지
• /
• 제10권7호
• /
• pp.1138-1147
• /
• 1999

본 논문에서는 단일 패치 안테나로 송수신을 동시에 수행할 수 있는 두 가지 형태의 Ku-밴드 위성통신 용 $2\times$ 마이크로스트립 패치 안테나 구현방안을 제시하였다. 첫 번째 형태는 단일급전 이중공진형 안테나로 9 90도 굽은 단일 급전선과 십자슬맛을 이용한 개구변 결합 급전방식을 적용하여 단일패치 방사소자에서 이중 공진과 서로 다른 직교면파를 만드는 방안을 제시하였으며. 두 번째 형태는 이중급전 이중공진형 안테나로 마이크로스트립 급전과 개구연 급전을 혼합해서 서로 다른 편파를 만들고 패치안테나에서 이중공진을 구현하 는 방안을 제시하였다. 특히 이중급천 이중공진형 안테나의 경우는 공기층을 삽입하여 대역폭을 확장하는 기 술을 적용하였다. 측정된 안테나의 성능을 살펴보면 두가지 형태의 안테나 모두 송수선 겸용안테나로서 동작 됨을 확인하였고, 이중급전 이중공진형 안테나의 경우 대역폭, 편파분리도의 성능이 우수함을 나타냈다.

• 한국자동차공학회논문집
• /
• 제9권2호
• /
• pp.210-215
• /
• 2001

The pole antenna of vehicles for AM/FM radio broadcasting receptions has many probems, such as damageable mechanical system and noise etc. It is considered that noise is composed of the structural vibration noise and the air flow induced aerodynamic noise. Also we find out that the setting process of a printed on-glass automobile antenna has many difficulties. Recently, the above mentioned problems can be reduced by employing enhanced wiper antenna which utilizes the windshied wiper arm. The new system is a passive antenna. In this study, experiments for the characteristics of a wiper antenna by measuring the SWR, radiation pattern and received powe have been carried out. The experimental results show that the efficiency of the wiper antenna has better performance than any other antenna.

• Advanced Composite Materials
• /
• 제17권3호
• /
• pp.215-224
• /
• 2008

The present study aims to design a multilayer microstrip antenna with composite sandwich construction and investigate fatigue behavior of this multilayer SAS (surface antenna structure) that was asymmetric sandwich structure for the next generation of structural surface technology. This term, SAS, indicates that the structural surface becomes an antenna. Constituent materials were selected considering electrical properties, dielectric constant and tangent loss as well as mechanical properties. For the antenna performance, antenna elements inserted into structural layers were designed for satellite communication at a resonant frequency of 12.2 GHz. From electrical measurements, it was shown that antenna performances were in good agreement with design requirements. In cyclic 4-point bending, flexure behavior was investigated by static and fatigue test. Fatigue life curve of the SAS was obtained. The experimental results of bending fatigue were compared with single load level fatigue life prediction equations and in good agreement. The SAS concept is can be extended to give a useful guide for manufacturers of structural body panels as well as antenna designers.

• Journal of Positioning, Navigation, and Timing
• /
• 제7권1호
• /
• pp.37-42
• /
• 2018

This paper proposed a microstrip antenna that can perform jamming of satellite signals from the GPS L5, GLONASS G3, BDS B2 frequency bands (1164 - 1217 MHz) that are employed mainly for military purposes among the GNSS frequencies using unmanned aircrafts over the enemy's sky in time of emergency. The single element in the proposed antenna can be easily mounted to unmanned aircrafts. This study analyzed the characteristics of miniaturization and beam of radiating elements by applying the image theories and perturbation effect to satisfy the uniform level at ${\pm}45^{\circ}$ of beam steering goal due to the phase delay after antenna array. The designed microstrip antenna had a miniaturized radiating element area (x-y plane), which was reduced by 76.3% compared to that of basic microstrip antenna, and its beam width was $190^{\circ}$ in the E-plane and $140^{\circ}$ in the H plane. In addition, the simulation was conducted to determine the characteristics due to the phase delay by arranging the designed single microstrip antenna by $1{\times}4$ array and the results showed that beam steering of ${\pm}45^{\circ}$ is possible in the H-plane on the basis of $0^{\circ}$. Thus, the proposed antenna was verified to be effective in satellite signal jamming in the air as it was attached to the lower end of unmanned aircrafts.

• 한국전자파학회논문지
• /
• 제27권11호
• /
• pp.972-977
• /
• 2016

본 논문에서는 920 MHz UHF(Ultra High Frequency) 대역과 13.56 MHz HF(High Frequency) 대역의 RFID 태그 안테나가 PE film에 단면에 프린트된 이중대역 태그를 설계하는 과정과 그 결과를 보여준다. 태그의 전체 크기는 일반 신용카드의 크기인 $80mm{\times}50mm$이고, 가장자리에 UHF 태그 안테나가 $76mm{\times}44mm$로 카드 크기보다 조금 작게 설계되었다. HF 대역 태그는 UHF 태그의 중앙에 $40 mm{\times}42 mm$ 크기로 상호작용을 감안하여 설계되었다. 단면에 실버잉크 Printing 기법으로 일반적인 HF용 태그와 다르게 Via를 사용하지 않고, 단면에 PE Film 위에 프린트를 한 후에 Jumper를 추가함으로써 HF 대역용 Loop 안테나와 UHF 태그와 같은 면에 설계하였다. 인식거리는 UHF 대역에서 약 6 m로 장거리에서 인식이 가능하고, HF 대역에서는 5 cm 이상으로써 두 개의 대역에서 사용이 가능한 태그로서 물류와 검증용으로 사용이 가능하다.

• 한국기계가공학회지
• /
• 제20권1호
• /
• pp.110-115
• /
• 2021

A multi-band, compact, and complex vehicle roof antenna has become important in terms of car exterior design and multi-functions which include Radio, DAB/DMB, SXM, GNSS, Telematics, and V2X. In this paper, we propose a compact multi-band V2X pole-type roof antenna. Using impedance change characteristic, a single pole antenna which has multiband such as radio, DAB/DMB, telematics, and V2X band is proposed. With two patch antennas for GNSS and SXM, the dimension of a multiband roof antenna is 131x63x37mm only.

• 한국정보통신설비학회:학술대회논문집
• /
• 한국정보통신설비학회 2007년도 학술대회
• /
• pp.151-154
• /
• 2007

This paper describes the project for constructing a traceability system for producing using RFID antenna in 900MHz frequency band and the consideration. In this project we reviewed analysis of properties classified by production process and RFID system through each frequency band, and designed a single unit RFID reader including antenna. The developed antenna is optimized to a field condition and this paper will show the test results. Also, we designed a single unit RFID reader by adding a reader to a designed antenna and explained the rule of tag memory allocation. Lastly, after running the system we could calculate visible and invisible effects of operation results and check up a wide possibility of application for RFID.

• Journal of information and communication convergence engineering
• /
• 제6권2호
• /
• pp.164-168
• /
• 2008

Wideband terminal and base station is required to serve not only existing 1st and 2nd generation mobile communication systems but also 3rd generation systems. In this paper, we presents a feasibility study on single feed compact wideband antenna for wireless communication applications including GSM (890-960 MHz), GPS (1575 MHz), DCS (1710-1880 MHz), PCS (1880-1990 MHz), UMTS (1900-2200 MHz), ISM (2400-2480 MHz), IMT2000 and satellite DMB bands. The original antenna was designed for partial discharge detection sensor in high voltage diagnostic system. However, we modified the original prototype to achieve shifted down resonant frequency for wideband wireless communication applications. The experimental result shows good return loss characteristics and radiation patterns except for the total gain at each resonant frequency. The maximum measured gain was 2.45 dBi${\sim}$3.18 dBi at 1710 MHz${\sim}$1880 MHz.