Young-Min Moon

Improved MIMO antenna by mutual coupling suppression between Elements

This paper describes a novel method for suppressing mutual coupling between antenna elements for application in MIMO antenna design. To suppress mutual coupling, several parasitic elements were employed in the proposed MIMO array antennas. Due to the effect of these parasitic elements, mutual coupling is markedly reduced. The proposed method shows that the improvement of mutual coupling is at least 10dB compared with conventional MIMO antenna arrays

The deadlock detection and resolution method for a unified transport system

In a unified transport system, traffic jams and vehicle deadlocks reduce efficiency causing the vehicles involved in it to cease moving. Deadlocks, in particular, halt the flow of vehicles. Therefore, predicting the possibility of a deadlock, identifying it and automatically resolving it are critical to improving lot delivery time. This paper proposes a method to detect a variety of deadlock phenomena in a unified transport system of 300 mm fab, thereby effectively improving lot delivery time.

A Small Monopole Antenna with Novel Impedance Matching Structure

A small monopole antenna with novel impedance matching structure is proposed in this paper. The proposed antenna is designed for W-LAN (IEEE 802.11b). The antenna design concept is based on lambda/8 folded monopole antenna with self-impedance matching structure. The size if the proposed antenna is smaller than the resonant length, thus the impedance at the terminal of the antenna becomes very capacitive. To compensate the impedance miss-matching, the proposed antenna employed a novel self-impedance matching structure. The self-impedance matching structure is located on the top of antenna; it improves the impedance matching and ultimately the efficiency of antenna

Compact 2-channel MIMO antenna for WiBro handy terminal application

A novel internal antenna of compact 2-channel MIMO for handy terminal is presented for WiBro(Wireless Broadband Internet) which operating at 2.35 GHz band. The proposed antenna is designed for minimum space occupation on PCB board of a mobile device so that the circuit design of a mobile device is convenient. We investigated for the reduction of mutual coupling between antenna elements. To decrease the mutual coupling, it is considered the projected(O) ground structure. By the adoption of the projected ground plane, the proposed antenna shows very low mutual coupling and also very low radiation coupling. The proposed antenna is well tuned in the 2.3 - 2.45 GHz WiBro band and have over 150 MHz (6%) bandwidth. The mutual coupling is under -17 dB at 2.35 GHz. Additionally, it is examined the S- parameters and radiation patterns with case of practical mobile device.

Small printed antennas with a parasitic folded shorted-strip for dual-band WLAN

Small printed antennas with a parasitic folded shorted-strip for dual-band WLAN are presented. The proposed antennas are based on the parasitic shorted-patch structure which is a popular approach for further bandwidth improvement. According to our simulation results, two prototype antennas are manufactured and measured. The obtained antennas operate in IEEE802.11a/b/g bands (2.4-2.484GHz and 5.15-5.35GHz bands) and can be adopted for various potable applications.

Self-Matched Miniature Antenna for WLAN

A miniature monopole antenna for W-LAN (IEEE 802.11b) is presented in this paper. The antenna design concept is based on lambda/8 folded monopole antenna with self-impedance matching structure. A size of the proposed antenna is smaller than the resonant length, thus the impedance at the terminal of antenna becomes reactive. To compensate the impedance miss-matching, the proposed antenna is employed a novel self-impedance matching structure. The self-impedance matching structure is located on the top of antenna; it improves the impedance matching and ultimately the efficiency of antenna

Electromagnetic coupled fed disk-loaded monopole antenna with multiple shorting pins [mobile applications]

In this paper, the effect of the number of shorting pins on a disk-loaded monopole antenna with electromagnetically coupled feed is investigated. The number and arrangement of the shorting pins affects the capacitance and/or inductance of the antenna. The variation of the capacitance and inductance changes the resonant frequency of the antenna, and therefore, its electrical size and frequency bandwidth are also affected. As the number of shorting pins increases, for an antenna having the dimensions of 11/spl times/11/spl times/11 mm, the center frequency, electrical size, and fractional bandwidth increases approximately by 327 MHz, 5.7%, and 0.112/spl lambda//sub 0/, respectively. The fabricated antenna for three shorting pins has a fractional bandwidth of 26.8% for a VSWR/spl les/2 with the center frequency at 2.556 GHz.