| Title | Small Ceramic Patch Antenna for UHF RFID Tag Mountable On Metallic Objects |
| Author | *Jeong-Seok Kim, Won-Kyu Choi, Gil-Young Choi (Electronics and Telecommunications Research Institute, Republic of Korea) |
| Page | pp. 861 - 864 |
| Keyword | RFID, Metal tag, Patch, Ceramic |
| Abstract | A very small UHF band RFID tag antenna using ceramic material mountable on metallic objects is presented. The proposed tag size is 25x25x3 mm. The impedance of the antenna can be easily matched to the complex conjugate of the tag chip impedance from the size of the shorting plate of the side patch and the size of the feeding loop. The antenna satisfactorily operates on metal plates, so it is applicable in many applications. The proposed design is verified by simulation and measurements which show good agreement. |
| Title | Multi-Band Internal Antenna for DVB-H and GSM Services |
| Author | *Jeongpyo Kim (Hanyang University, Republic of Korea), Giho Kim, Wonmo Seong (E.M.W. Antenna. Co., Ltd., Republic of Korea), Jaehoon Choi (Hanyang University, Republic of Korea) |
| Page | pp. 865 - 868 |
| Keyword | tunable, pifa, dvb-h, gsm |
| Abstract | We propose a multi-band internal antenna for the DVB-H and the GSM services. The proposed antenna consists of a tunable PIFA for the DVB-H service and a dual band folded monopole for the GSM 900 and the DCS 1800. The resonant frequencies of the designed antenna are independently adjusted. It can be used for a complex mobile set for a broadcasting service. |
| Title | Semi-Blind Channel Estimation for OFDM with Multiple Receive Antennas |
| Author | *Jin-Goog Kim, Kyun-Sang Park, Hyun-wook Jo, Jong-Tae Lim (Department of Electrical Engineering and Computer Science, Korea Advanced Institute of Science and Technology, Republic of Korea) |
| Page | pp. 869 - 872 |
| Keyword | channel estimation, OFDM, semi-blind |
| Abstract | This paper presents a semi-blind channel estimation scheme for
OFDM systems with multiple receive antennas. Using the statistical
property of the received signal, we combine the pilot-based
least-squares estimator with the subspace-based blind estimator.
To improve the performance of the subspace-based method, we reduce
the effect on the residual error which affects the accuracy of the
noise subspace. Simulation results show that the proposed method
is effective and improves the performance. |
| Title | Simultaneous Estimation of Azimuth and Elevation Angles and Frequency of Plane Wave Signals Using a Modified Matrix Pencil Method |
| Author | *Muhammad Faisal Khan, Muhammad Tufail (Pakistan Institute of Engineering & Applied Sciences, Pakistan) |
| Page | pp. 873 - 876 |
| Keyword | Matrix Pencil, DOA, Parameter Estimation |
| Abstract | The modified matrix pencil method is extended from 2D to 3D for simultaneously estimating azimuth and elevation angles and frequency of multiple signals impinging on a volumetric array of sensors. Conventional matrix pencil method, which is used to estimate unknown parameters, needs a separate algorithm to associate the estimated components with each other to get proper groups of azimuth and elevation angles and frequencies of incoming signals. Proposed method automatically estimates unknown parameters in grouped form, thereby bypassing the computationally expensive pairing operation. |
| Title | The Variation of Ionospheric Slab Thickness at Thailand Equatorial Latitude Station |
| Author | Pusit Suvannasang, *Noraset Wichaipanich, Nipa Leelaruji (King Mongkut's Institute of Technology Ladkrabang, Thailand), Mamoru Ishii (National Institute of Information and Communications Technology, Japan), Pornchai Supnithi (King Mongkut's Institute of Technology Ladkrabang, Thailand) |
| Page | pp. 877 - 880 |
| Keyword | ionospheric slab thickness, TEC, NmF2, foF2 |
| Abstract | This paper presents the study and analysis of ionospheric slab thickness during the solar minimum in year 2006. The ionospheric slab thickness is obtained from the ratio of the total electron content (TEC) to the peak electron density in the F2 region (NmF2). According to the analysis of the total electron content and the peak electron density in the F2 region, the peak electron density in the F2 region by critical frequency (foF2) are determined by ionosonde technique. In addition, the total electron content are determined by the correlation of different time delay of 2 L - band signals from GPS satellites. All three parameters, critical frequency, total electron content, and peak electron density in the F2 region, are analyzed at the Chumphon campus King Mongkut’s Institute of Technology Ladkrabang station, located at longitude 99.3 °E and latitude 10.7 °N. The analyzed results show that there are irregularities of all parameters during the equinox period and the ionospheric slab thickness at low latitude peaks in the pre-sunrise. |