Jwo-Shiun Sun

COMPACT PRINTED SLOT ANTENNAS FOR WIRELESS DUAL- AND MULTI-BAND OPERATIONS

This paper presents a printed slot antenna using the printed structure in order to improve its dual-band and compact size performances. The printed slot structure is used as additional resonators to produce dual-band operation for covering the worldwide interoperability for microwave access (WiMAX) and the 5.2-GHz wireless local area network (WLAN) bands. In order to achieve wideband and multi-band operation, the slot antennas with a slotted structure and an inverted-L slot structure for covering the wireless communication operations are developed. Finally, we propose a novel and compact printed slot antenna with mixing slot structures to obtain and cover for the 2.4-GHz WLAN (2.4–2.484 GHz), the WiMAX (IEEE 802.16e in the Taiwan: 2.5–2.69/3.5–3.65 GHz), and the 5GHz WLAN (5.15–5.35/5.725–5.825 GHz). Several properties of the proposed antennas for dualand multi-band characterize radiation performances such as impedance bandwidth and radiation pattern. Measured gain has been confirmed experimentally for the multi-band wireless communication systems.

Design of a Multiband Antenna for Mobile Handset Operations

A compact internal antenna is proposed for GSM/GPS/DCS/PCS/UMTS/Bluetooth/WLAN/WiFi/WiMAX applications. The proposed antenna is comprised of a loop antenna and a monopole antenna. The antenna system shows wide multi-operation band as well as good radiation patterns and small volume. The antenna can be printed on the system circuit board of the mobile phone and short-circuited to the system ground plane to form a loop-type structure. A comparison with that of the existing antennas showed that wide impedance bandwidth of the proposed structure can be achieved without increasing the implementation complexity.

A New Printed Antenna for Multiband Wireless Applications

This study presents a new design of a printed antenna with simply shaped radiator element for multi-operating bands of the wireless communication systems. With a simple design configuration and slot form on a printed circuit board, the proposed antenna can be used in multiband wireless operations, covering the GSM (880-960 MHz), DCS (1710-1880 MHz), PCS (1850-1990 MHz), UMTS (1920-2170 MHz), 2.4-GHz WLAN (2400-2484 MHz), Mobile-WiMAX (IEEE 802.16e in the Taiwan: 2500-2690 MHz) and 5-GHz WLAN (5150-5350/ 5725-5825 MHz) bands. Several properties of the proposed printed antenna in multiband operation, such as impedance bandwidth, radiation pattern and measured gain are numerically and experimentally investigated.

Dual-Band Dipole Antenna for RFID Tag Applications

New design of a dipole antenna with rectangular fractal shape radiator element with two operating bands for radio frequency identification (RFID) is presented. By using fractal shape slot and metal meander patch, the proposed antenna has the wide and dual measured return loss bandwidth. Besides, the omnidirectional radiation pattern of the design antenna cover the entire frequency range including ultra high frequency (UHF, 860 MHz~960 MHz) band and microwave (2.45 GHz) band has been obtained. Several properties of the proposed antenna for dual-band operation such as impedance bandwidth, radiation pattern and measured gain have been investigated numerically and experimentally in detail.

Triple-Band MIMO Antenna for Mobile Wireless Applications

This letter presents a planar triple-band multiple- input-multiple-output (MIMO) antenna that meets GSM900/1800 and LTE2600 bands protocols. The antenna element contains three individual meander-line-type inverted-L radiators; the highest frequency band radiator is fed by a transmission line, while the other two utilize the proximity-coupling feeding mechanism driven by the highest band radiator. The MIMO antenna is incorporated with two symmetric triple-band antenna elements and two physical decoupling devices. The two antenna elements are closely spaced with 1/15 wavelength of the lowest band. The two decoupling devices, a T-shaped slot and a meandering microstrip-line resonator, are built for the highest and the lowest frequency bands, respectively. Meanwhile, a negligible mutual coupling effect in middle band is achieved by using a collinear-placed transverse meander-line pair in the MIMO antenna. The antenna prototype measurement results show good impedance matching with low mutual coupling effect. The calculated envelope correlation coefficient verifies the suitability of the proposed antenna for mobile wireless access applications.

A Novel Compact 2.4/5.2 GHz Dual Wideband Bandpass Filter with Deep Transmission Zero

In this study, a novel compact 2.4/5.2 GHz dual wideband bandpass filter was designed and fabricated on an Al2O3 ceramic substrate. First, a dual-band filter was designed based on two open-loop rectangular ring (OLRR) resonators, which were cascaded using a coupling connection in order to increase the bandwidths of the dual passbands. Diverging U-shaped dual feed input/output transmission lines were used for strong coupling. A shunt quarterwavelength open stub eliminated unwanted harmonic frequencies and transmitted the desired passbands. To achieve this, four open stubs were directly added onto the two OLRR resonators as bandstop resonators to reject undesired frequencies and improve the out-of-band rejection between the two resonant frequencies. The coupling sections between the two resonators were modified using a groove structure to regulate the coupling of the two modes and eliminate the ripple at the designed 5.2 GHz band. According to simulated and measured results, the proposed filter with optimized parameters exhibited dualwide passbands with bandwidths of 530 MHz (22.84%) and 650 MHz (12.29%) at 2.32 GHz and 5.29 GHz, respectively.

Characteristics of UWB antenna and wave propagation

This paper proposes an omni-directional UWB antenna pattern in azimuth cut, low voltage standing wave ratio (VSWR), and easy to construct antenna for ultra wideband (UWB) systems. The designed antenna uses the multi circular blade configuration with a radiating element and on two different ground planes (square and circular ground shape). The multi-circular blades UWB antenna suitable for IEEE 802.15.3a and IEEE 802.16 UWB communication applications at 3.1-10.6 GHz and 2-11 GHz bands is presented and in specification. This paper discusses the phenomenon of dispersal in UWB antennas and presents a simple design to evaluate the radiated fields from antennas structures. About the characteristics of UWB antenna of antenna bandwidth, antenna efficiency, co-polarization, cross-polarization and pattern integrity are discussed and measured and compared. New multi-blades circular metal for orthographical monopole UWB antenna design and enhanced which measured results exhibit extend return loss bandwidth and lower omni-directional pattern deviation in azimuth cut and lower pattern ripple. The antenna design allows a quick assessment of dispersion in design. The proposed multi-circular blades UWB structures is capable of achieving broadband and omni-direction at azimuth cut characteristics within 2-1 IGHz for UWB wireless communication applications and experiment.

CPW-Fed UWB slot antenna

A new design of slot antenna by CPW-fed is proposed for ultra-wideband (UWB) applications. The proposed antenna consists of a CPW-fed, and a pair of symmetry curved radiating slot. Using tapered slot forms obtain the bandwidth from 3 GHz to 20 GHz over entire UWB spectrum. The proposed antenna could cover simulated and measured results show that new design CPW-fed UWB slot antenna keeps acceptable patterns and gains. Detail design and experiment are showed and discussed in this paper.

A New Printed Slot Loop Antenna With Tunable Strips for 2.4- and 5-GHz Wireless Applications

This letter presents a new printed slot loop antenna with a pair of tunable strips for wireless communication systems in 2.4-GHz (2.40-2.48 GHz) and 5-GHz (5.15-5.95 GHz) bands. If a pair of the strips is inset at the center of the slot loop antenna, then the resulting impedance bandwidth for the two main operating bands can reach about 100 MHz for the 2.4-GHz band, and 1550 MHz for the 5-GHz band, thus covering the required operations of a wireless local area network (WLAN). Experimental results confirm in detail several properties of the proposed antenna design, such as the impedance bandwidth, radiation pattern and measured gain.

The 3D Far-Field Antenna Measurement Technology for Radiation Efficiency, Mean Effective Gain and Diversity Antenna Operation

In this paper, facilities of antenna measurement have recently commissioned a spherical far-field measurement system. The low profile far-field spherical scan system provides significant advantages over the older far-field testing including elimination of problem of simple theta (thetas) and phi (phi) rotary axis with indoor far-field range testing, complete measurement characterization of the antenna, and improved accuracy. The mobile phone under test of far-field range testing has been the plan at the Cellular Telecommunications & Internet Association (CTIA) certification program test requirements for performing radiated power and receiver performance measurement. This paper will discuss the antenna and wireless system integration tested with the TRP/TIS and spherical antenna measurement for far-field system. The spherical far-field antenna system applied to total radiation efficiency, mean effective gain (EMG) and diversity gain measurement and applications.