Design school of reception antennas on digital terrestrial television for high school students by using WIPL-D

Three day design school of the reception antenna on the digital terrestrial broadcasting for high school students has been held by using the electromagnetic simulator WIPL-D. This school is the first trial of the education based on the electromagnetic simulator. The students designed the reception antennas composed of wire or planar conductor in the frequencies from 470 MHz to 518 MHz. The students could understand the antenna characteristics by seeing the animation of current and electromagnetic field distribution on the display of PC.ACES-2008, March 30 - April 4, 2008, Niagara Falls, Canad

Two Low Profile Unbalanced Fed Inverted L Elements on Square Conducting Plane for MIMO Applications

Two ultra low profile inverted L antennas located on the square conducting plane are numerically and experimentally analyzed as the multiple input multiple output (MIMO) antenna system. When the size of conducting plane is 0.45 λ by 0.45 λ and the height of antenna is 0.03 λ, the directive gain of 4.12 dBi and the return loss bandwidth of 3.67% are achieved. The proposed antenna has good diversity gain shown by the correlation coefficient, and becomes less than 0.02 at the frequency of 2.45 GHz band when the distance between inverted L elements is 0.33 λ. The results show the weak mutual coupling of the proposed antenna and its performances are promising as MIMO antenna applications

Dual Band MIMO Antenna Composed of Two Low Profile Unbalanced Fed Inverted L Antennas for Wireless Communications

A low profile dual-band multiple-input-multiple-output (MIMO) antenna system is proposed. The proposed MIMO antenna consists of two low profile unbalanced fed inverted L antennas with parasitic elements to resonate at 2.45 GHz and 5 GHz. The structure is uncomplicated by locating two ultra low profile inverted L antennas on the finite conducting plane. The proposed MIMO antenna is numerically and experimentally analyzed. When the size of conducting plane is 55 mm by 55 mm and the height of antenna is 9 mm, the directive gain of 4.11 dBi and the S11 bandwidth of 5.71% are achieved for lower frequency of 2.45 GHz. At the upper frequency of 5 GHz, the directive gain of 8.22 dBi and the S11 bandwidth of 6% are obtained. The proposed antenna has good diversity gain, shown by the correlation coefficient becomes less than 0.005 at the frequency of 2.45 GHz and 5 GHz band when the distance between inverted L elements is 41 mm. A good agreement between calculated and measured results is obtained. The results show that the weak mutual coupling of the proposed antenna and this feature enables it to cover the required bandwidths for WLAN operation at the 2.4 GHz band and 5 GHz band

Two element phased array dipole antenna on finite EBG ground plane

Two element phased array dipole antenna backed by finite EBG ground plane is proposed for the directional antenna. Two dipole element is fed with 90 degree phase difference. In the numerical analysis, the electromagnetic simulator WIPL-D based on the Method of Moment is used. The size of EBG ground plane is fixed to one wavelength by one wavelength at the design frequency of 2.45 GHz. The relation between the front-to-back ratio and the parameters of EBG ground plane is discussed. The maximum front-to-back ratio of 24 dB is obtained.ACES-2007, March 19-23, 2007, Verona, Ital

Miniaturization of ultra low profile inverted L antenna on rectangular conductor

The ultra low profile inverted L antenna, whose horizontal element is bent as a meander line shape, is proposed and numerically analyzed for the reception antenna for the keyless entry system of automobiles at 315 MHz band. In the case of the conducting plane of 70 mm by 350 mm and the antenna height of 31.7 mm, the directivity of 2.48 dBi is obtained. In the numerical analysis, the electromagnetic simulator WIPL-D based on the Method of Moment is used.2011 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, APSURSI 2011; Spokane, WA; 3 July 2011 through 8 July 201

Analysis of dipole antenna printed on thin film by using electromagnetic simulators

The printed dipole antenna on thin polyimide film is calculated by using WIPL-D and IE3D based on the method of moment, Micro-Stripes based on TLM method. Its input impedance characteristics are compared with measured data and discussed.2005 IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 3-7 April, 2005, Honolulu, Hawai

Adaptive Antenna Composed of Six Dipole Elements for Wireless LAN

International symposium on Antennas and Propagation (ISAP2008), Taipei, Taiwan, TP-C28, 1645414, Oct.29 2008

WIDEBAND SLEEVE ANTENNA

The wideband sleeve antenna is numerically and experimentally analyzed and its return loss characteristics are examined. This antenna is fed by the coaxial transmission line and has two sleeves. The outer conductor of the transmission line and the hollow larger conductor form the lower sleeve and the inner conductor of transmission line and the hollow larger conductor form the upper sleeve. This antenna is calculated by the electromagnetic simulator Fidelity based on the FDTD method. The return loss characteristics become wider near the resonant frequencies of two sleeves

Effect of ice algal community on the increase of chlorophyll a concentration during spring in coastal water of the Sea of Okhotsk

A seasonal study of size fractionated chlorophyll α concentration was conducted weekly in Monbetsu Harbor from October 1996 to November 1997 to investigate the annually persistent occurrence of the spring peak of the chlorophyll α concentration in the >10μm size fraction immediately after the retreat of sea ice, as described by K. Hamasaki et al. (Plankton Biol. Ecol., 45,151,1998). Species composition of natural phytoplankton assemblages was also investigated to study whether phytoplankton or ice algae were responsible for the spring peak in the coastal water. The spring peak occurred immediately after the retreat of sea ice but timing of the occurrence was different between the stations occupied in the present study. The spatial heterogenity in occurrence of the spring peak seemed to be related to the sea ice distribution between the stations. New sea ice provided only a small supply of ice algae due to the relatively short growth period inside of the harbor. Large ice floes provided for a large supply of ice algae due to the long growth period outside of the harbor. The magnitude of the spring peak was related to sea ice growth. However, those ice algae seemed to sink to the bottom with little contribution to phytoplankton assemblage in the harbor, while ice algae contributed significantly to the spring peak outside of the harbor. Species composition revealed relatively fast response of phytoplankton to the environmental change after the disappearance of sea ice. Surface assemblages of phytoplankton including ice algae seemed to respond fully to the regional optical condition by changing in the species composition

Numerical analysis of microstrip antenna by using electromagnetic simulators

The probe-fed truncated square patch microstrip antenna is calculated by using WIPL-D based on the method of moment, Micro-Stripes based on TLM method and Fidelty based on FDTD method. Its input impedance and radiation characteristics are compared and discussed.ACES-2004, April 19-23, 2004, Syracuse, N