Yong-Sun Shin

A broadband interior antenna of planar monopole type in handsets

A novel internal antenna of planar monopole type is presented for broadband applications. The proposed antenna fed by a 50-/spl Omega/ microstrip line covers the digital cordless system (DCS, 1710-1880 MHz), personal communication system (PCS, 1750-1870 MHz), and international mobile telecommunication (IMT-2000, 1885-2200 MHz) bands within S/sub 11/<-10 dB. The antenna occupies a compact volume of 20/spl times/17/spl times/4.7 mm/sup 3/ and it is suitable to be built-in within the housing of a mobile phone. The bandwidth of the proposed antenna (VSWR<2) has 740 MHz starting from 1620 to 2360 MHz. The IE3D software and microwave studio (MWS) simulation are employed for optimizing the design parameters, and the simulation results are in agreement with those of the measured one, considering each associated case of the antenna itself, phone case, and battery.

GSM/DCS/IMT-2000 triple-band built-in antenna for wireless terminals

The development of electrically small antennas plays an important role in the rapidly growing mobile communication market. This work presents a novel design technique for a triple-band small internal antenna which covers the GSM/DCS/IMT-2000 bands. The proposed antenna consists of double shorting posts, feed post, and dual-crossed C-slot patch radiators. A high-frequency structure simulator simulation is employed for optimizing the design parameters, and the simulation results agree with the measured data. The IE3D simulation is also used to obtain the current distribution at the resonant frequencies. The maximum gains at the frequencies 950 and 1860 MHz are measured to be about 1.58 and 1.3 dBi, respectively. These positive antenna gains and triple-bands of the proposed antenna are very attractive features for GSM/DCS/IMT-2000 bands handset applications.

A Compact Loop Type Antenna for Bluetooth, S-DMB, Wibro, WiMax, and WLAN Applications

This paper presents a novel compact loop type antenna for Bluetooth, satellite-digital multimedia broadcasting, wireless broadband, and wireless local-area network applications. The proposed antenna fed by a 50-Omega coaxial line occupies a compact volume of 26 times 8 times 3 mm3 . The bandwidth is 19.9% (2.26-2.76 GHz) and 45.6% (4.03-6.4 GHz) at S11< -10 dB and the measured maximum gain is 6.41 dBi at 5.35 GHz. The Microwave Studio simulation is employed for optimizing the design parameters, and the simulated results agree well agree with those of the measured one.

A T-Shaped Wide-Slot Harmonic Suppression Antenna

This paper proposes a T-shaped wide-slot harmonic suppression antenna at 4 GHz. Harmonic suppression is achieved by using a narrow microstrip-line-fed and a grounded T-shaped conductor line. The return losses and radiation patterns of the antenna at the fundamental and harmonic frequencies are measured and compared to those of the conventional T-shaped slot antenna. Equivalent circuit models are also presented to give physical insight into harmonic suppression mechanism.

A novel PIFA type varactor tunable antenna with U-shaped slot

A planar inverted-F antenna type tunable antenna with U-shaped slot is proposed. A varactor diode is integrated between the slot and bias feeding strip line for tuning the operating frequency. This antenna covers from 1.64 GHz to 2.05 GHz refer to the dc bias voltage from 0 V to 20 V The frequency tuning range is about 410 MHz bandwidth which covers several mobile communication bands of DCS (1710~1880 MHz), PCS(1750~1870 MHz) and PCS(USA)(1850~1990 MHz). This antenna occupies a compact volume of 40 times 15 times 8 mm3. The simulation result is based on the Finite Integral Method.

A novel compact PIFA for wireless communication applications

A compact PIFA for Bluetooth, S-DMB, Wibro, WiMax, and WLAN applications is introduced. The proposed antenna is fed by a coaxial connector and has the modified shorting plate structure for the enhanced bandwidth at the low band. The bandwidth is 19.4% (2.28-2.77 GHz) and 47.7% (4.04-6.57 GHz) at VSWR < 2.5 and the measured maximum gain is 4.95 dBi at 6.3 GHz. Details of the antenna design and experimental results are demonstrated.

A chip antenna with magneto-dielectric material

This paper presents a chip antenna with the magneto-dielectric material. The proposed antenna with a supporter has a compact dimension of 9.5 times 3 times 1 mm3. The bandwidth is 875 MHz which range is from 3 GHz to 3.875 GHz at S11 Lt - 10dB and the maximum gain is 4.92dBi at 3.74GHz. In this case, the magneto dielectric material is not perfect because the real value of the complex permeability is not higher than one. So, in the near future, we will try to manufacture again and then apply to the antenna which covers other frequency band.

3D Spherical Antenna Measurement System for CTIA OTA Testing and Characterizing of Mobile MIMO Terminals

This paper describes the 3D spherical antenna measurement system for a passive antenna measurement, CTIA (Cellular Telecommunications & Internet Association) OTA (Over The Air) testing and characterizing of mobile MIMO (Multiple-Input Multiple-Output) terminals. The measurements of the monopole box are performed for the calibration of the proposed measurement system. Finally, the proposed system is able to measure the experimental model of MIMO terminal with adapting the diversity antenna system.

Diversity Planar Monopole Antenna for WLAN Application with Enhanced isolation characteristics

A printed diversity monopole antenna for WLAN operation at the 5 GHz band, such as the 5.2GHz (5150-5350 MHz) and 5.8GHz (5725-5875 MHz) bands is presented. The proposed diversity antenna fed by a coaxial connector consists of two planar monopole antennas which are symmetrical and a ground which has two slots for enhanced isolation characteristic between two antennas. The bandwidth of the diversity antenna (S1K-10 dB) has achieved about 2360 MHz starting from 4520 MHz to 6880 MHz. Details of the antenna design and experimental results are demonstrated.

Broadband internal antenna of planar monopole type for mobile handsets

The paper presents a novel internal antenna of a planar monopole type. The proposed antenna, fed by a 50 /spl Omega/ microstrip line, operates at DCS (1710-1880 MHz), PCS (1750-1870 MHz), and IMT-2000 (1885-2200 MHz) bands. The size of the antenna, not including the support, is 20/spl times/17/spl times/0.2 mm/sup 3/. The bandwidth of the proposed antenna (S11<10 dB) is 740 MHz, from 1620 MHz to 2360 MHz. Numerical simulation and experiment results are performed taking into consideration the antenna itself, the phone case, and the battery.