• Title/Summary/Keyword: Aperture-coupled

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The sideband Microstrip Patch Antenna with L-shaped Aperture (L자형 개구면을 갖는 광대역 마이크로스트림 패치 안테나)

  • Shin, Ho-Sub;kim, Nam;Jang, Yong-Woong;Rhee, Seung-Yup
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2000.11a
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    • pp.350-353
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    • 2000
  • In this paper, we designed the microstrip patch antenna with L-shaped aperture, which greatly enhances its bandwidth. We optimized to get a maximum bandwidth. The microstrip patch antenna with L-shaped aperture has the widest bandwidth of the conventional aperture coupled microstrip patch antenna. This antenna also has the low-cross polarization level. The effects of changing several key design parameters of the antenna are investigated. We calculated the VSWR, input impedance, and radiation pattern.

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A Miniaturized Aperture-Coupled Multilayer Hairpin Bandpass Filter

  • Moon, Han-Ul;Choi, Seung-Un;Yun, Sang-Won
    • Journal of electromagnetic engineering and science
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    • v.8 no.1
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    • pp.12-16
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    • 2008
  • In this paper, we introduce a coupling, which is achieved through the aperture instead of the conventional edge coupling, so that the bandpass filter is reduced less than half in size compared to conventional planar type. The resulting filter configuration has a near two-fold symmetry, where the aperture coupling is used in the middle of the coupling stages. We designed a bandpass filter using two tapped hairpin resonators, of which the order becomes four. The designed bandpass filter has the size of $8.9{\times}18.3\;mm$. It has the return loss better than 17dB and the insertion loss of less than 5 dB in overall passband. The measured results show good agreements with simulated ones.

Design of Modified H-slot Aperture-coupled Circular Polarization Microstrip Array Antenna (변형된 H형 슬롯 개구결합 원형편파 마이크로스트립 배열안테나 설계)

  • Park, Ki-dong
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.40 no.7
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    • pp.1363-1368
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    • 2015
  • Aperture-coupled circular polarization microstrip array antenna is proposed in this paper. The proposed antenna is useful for 2.4GHz ISM band and its aperture shape is a modified H-slot. The optimal design parameters for the antenna structure is found by using electromagnetic analysis tool HFSS repeatedly. The HFSS simulation results, such as return loss, axial ratio, radiation pattern and gain of the proposed array antenna are compared with results of the single antenna. It is able to verify that the proposed array antenna is valuable enough to be used in various applications as well as 2.4GHz ISM band.

Dice-Five Polarization-Agile Corner-Fed Patch Array Antenna

  • Vallecchi, Andrea
    • ETRI Journal
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    • v.27 no.3
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    • pp.250-256
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    • 2005
  • A novel planar polarization-agile microstrip subarray is proposed and its performance assessed by a thorough numerical investigation. The subarray consists of five square patches with a central element, directly coupled to a pair of microstrip feed lines by a cross-shaped aperture, which spreads the power outwards to the other patches through a network of suitable connections. By properly exciting the antenna at its input ports, any kind of polarization of the radiated field can be accomplished with fairly low cross-polarization levels. Moreover, since only two feed lines are required to drive the whole subarray, polarization agility is simply and attractively achieved by a single phase-shift circuit. The design concept is described and the results of the analyses and simulations performed by two completely independent full-wave approaches are presented and discussed.

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Wideband 4×8 Array Antennas with Aperture Coupled Patch Antenna Elements on LTCC

  • Jun, Dong-Suk;Bondarik, Alexander;Lee, Hong-Yeol;Ryu, Han-Cheol;Paek, Mun-Cheol;Kang, Kwang-Yong;Choi, Ik-Guen
    • Journal of electromagnetic engineering and science
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    • v.10 no.3
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    • pp.150-157
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    • 2010
  • We proposed a $4{\times}8$ array antenna with aperture-coupled patch antenna elements. The antenna was designed for 60 GHz operation and fabrication on the low-temperature cofired ceramic(LTCC) substrate($\varepsilon_r$=5.8). The feedline with the stub was designed to enhance the radiating element bandwidth and the transition characteristics between the waveguide (WG) and microstrip line(MSL). Through the optimization of the antenna and feedline geometry, the antenna gain and the performance of the 10 dB bandwidth were 20.2 dBi and 13 % up, respectively. The measured results agreed with the simulated ones.

Design of a Ka-Band Microstrip Array Antenna for Satellite Communication (위성통신용 Ka-Band 마이크로스트립 배열안테나의 설계)

  • 류정기;임인성;이덕재;민경일;오승엽
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.10 no.1
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    • pp.142-149
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    • 1999
  • In this paper, Aperture-coupled microstrip array antenna was designed and manufactured for satellite communication at Ka-Band. We analyzed a microstrip radiation element and designed power divider using $\lambda$g/4 transformer and T-junction power divider. A manufactured Aperture-coupled $2\times2$ microstrip array antenna has a resonant frequency of 20 GHz. The experimental results are as followings : resonant frequency of 19.62 GHz, VSWR 1.0692, return loss -29.61 dB, Bandwidth 1.76 GHz and -3 dB beamwidth $42^{\circ}$.

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Design of an Aperture-Coupled Dual Beam Microstrip Array Antenna (개구면 결합 급전 방식의 이중 빔 마이크로스트립 배열 안테나의 설계)

  • 이영주;박위상
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.10 no.5
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    • pp.738-746
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    • 1999
  • In this paper, a microstrip $18\times2$ dual beam array antenna is designed at 10 GHz. The radiating element is an aperture-coupled patch, and it is analyzed by the transmission line model. The feed is a tapered parallel-series type to reduce the side lobe level. To obtain dual beam at $\pm45^{\circ}$, The difference in phase excitation between the elements is $180^{\circ}$. In conclusion, the side lobe level is 25 dB, and the beam width $8^{\circ}$with two main lobes at $\pm44.5^{\circ}$.

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Development of hand-held coded-aperture gamma ray imaging system based on GAGG(Ce) scintillator coupled with SiPM array

  • Jeong, Manhee;Hammig, Mark
    • Nuclear Engineering and Technology
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    • v.52 no.11
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    • pp.2572-2580
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    • 2020
  • Emerging gamma ray detection applications that utilize neutron-based interrogation result in the prompt emission of high-energy (>2 MeV) gamma-rays. Rapid imaging is enabled by scintillators that possess high density, high atomic number, and excellent energy resolution. In this paper, we evaluate the bright (50,000 photons/MeV) oxide scintillator, cerium-doped Gd2Al2Ga3O12 (GAGG(Ce)). A silicon photomultiplier (SiPM) array is coupled to a GAGG(Ce) scintillator array (12 × 12 pixels) and integrated into a coded-aperture based gamma-ray imaging system. A resistor-based symmetric charge division circuit was used reduce the multiplicity of the analog outputs from 144 to 4. The developed system exhibits 9.1%, 8.3%, and 8.0% FWHM energy resolutions at 511 keV, 662 keV, and 1173.2 keV, respectively. In addition, a pixel-identification resolution of 602 ㎛ FWHM was obtained from the GAGG(Ce) scintillator array.

An Aperture-coupled Microstrip Shaped-beam Array antenna for the PCS Basestation. (개구 결합 구조를 갖는 PCS 기지국용 마이크로스트립 정형 빔 배열 안테나)

  • 여운식;김광조;강승택;김형동
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.8 no.6
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    • pp.363-644
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    • 1997
  • This paper presents the design and fabrication of a shaped-beam array antenna which will be used for a PCS basestation using structure that is coupled to a microstrip line by an aperture on the interening ground plane. The shaped-beam pattern is obtained by an antenna synthesis method. An array antenna considering the mutual coupling between array elements patches) and a feeding network are designed by CAD tools. The feeding network is designed by using the Wilkinson power divider to obtain the optimized shaped-beam. The designed results are compared with the measured data.

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A Study on Ku-band Antenna for Mounting on UAV (무인 항공기 탑재용 Ku대역 안테나에 관한 연구)

  • Park, Jin-Woo;Ryu, Ji-Ho
    • Journal of the Korea Institute of Military Science and Technology
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    • v.17 no.1
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    • pp.50-56
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    • 2014
  • In this paper, we proposed a Ku-band antenna that can be mounted on UAV. A proposed antenna structure has small size and light weight. It is considered long distance communication environment(LOS) and equipped UAV. Proposed antenna is designed $16{\times}2$ aperture coupled microstrip patch array antenna for high gain characteristics. In the measurement results, VSWR is less than 1.5 and the gain is over 21dBi in the bandwidth. Mechanical specifications of antenna assembly are ${\phi}250{\times}200mm$ of size and 3kg of weight.