Yd Chen

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.

The Wideband Marchand Balun Transition Design

This paper presents a practical and simple broadside coupled-line balun with multi-layers profile microstrip line and broadside coupling structure to enhance the coupled coefficient and balanced output bandwidth. Designed broadside coupled-line balun design with a symmetric quarter wavelength coupled-line is developed to increase wider bandwidth efficiency and the return loss is better than the traditional planar marchand coupled-lines balun. The structure of the designed balun is fairly simple, practical and easily fabricated. The measured results show good agreements with those analyses data.

The Pliant Monopole Antenna (PMA) Design for Handset Phone Operation

This paper proposes a new antenna technique for pliant monopole antenna (PMA) as a radiator. This branch meander lines PMA based on two asymmetric meander lines with flexible structure exhibits good performances. Branch lines PMA radiator has the merits to improve antenna bandwidth with fine frequency tuning. The design bandwidth full cover 820 MHz~960 MHz and 1700~1990 MHz The PDA phone for GSM, EGSM, DCS, PCS, CDMA and CDMA2000 applications is well demonstrated with the integration and measurement of the co-designed PMA.

3D Far-field antenna scanning technique apply to radiation efficiency and mean effective gain measurement

This paper proposes a new antenna technique for flexible printed monopole antenna (FPMA) as a radiator. This meander lines FPMA based on two asymmetric meander lines with flexible structure exhibits good performances. Meander lines FPMA radiator has the merits to improve antenna bandwidth with fine frequency tuning. The PDA phone for CDMA2000 cellular (824-894 MHz), PCS (1850-1990 MHz) and GPS (1571.42-1579.42 MHz) applications is well demonstrated with the integration and measurement of the co-designed FPMA. Based on 3D far field antenna measurement system to get the antenna performance of total radiation efficiency and mean effective gain (MEG).

Dual-band 1-D PBG

This paper describes a harmonic tuning for 1-D microstrip PBG transmission line. ABCD matrix modeling for a periodic defect PBG structure on microstrip is determined. Microstrip PBG structure with wide stopband characteristic for broadband harmonic rejection tuning has been experimentally verified. Method of moment is applied to simulate the fields and currents distribution of the design. The results of full wave electromagnetic analyses are in good agreement with those experimental data. An optimal structure of the ID PBG microstrip structure is determined.

Mobile handset and radiation power absorption measurement

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. In this paper, facilities of mobile phone 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. This paper will discuss the antenna absorption and wireless system integration tested with the TRP/TIS and spherical antenna measurement for far-field system, and the results being achieved.

The Novel 3-Way Power Dividers/Combiners Structure and Design

A fabricated 1:3 power divider that provides equal power split to all four output ports over a large bandwidth is presented, which can be extended to an arbitrary number of output ports. A new wideband three-way microstrip power divider implemented on a single-layer printed circuit board (PCB) is presented in this design. The proposed three-way planar power divider consists of a branch lines and a combine line for three output ports of characteristics of equal magnitude and in-phase. To demonstrate the design methodology, one prototype is realized. The new design was simulated and validated by the measurement. Measured results show that 10 dB return loss of the three output ports has been achieved across the bandwidth from 1.8 GHz to 10.5 GHz.

The Tapered TEM Horn Antenna Design for EMC and Radiation Measurement

The semi-rigid cable for microwave band as a feeding network structure that effectively excited tapered TEM horn antenna geometry is proposed. The semi-rigid cable to parallel waveguide transition then to fed tapered TEM horn antenna. The designed tapered TEM horn antenna has the merits such as wideband, simple feeding network, low profile compact size with fairly good antenna performances such as return loss, peak gain and radiation patterns.

The Omni-directional Dipole Antenna Structure and Design

The design relates generally to the field on antennas and more specifically, to a low profile linear polarized H-shape dipole antenna. The antenna includes a printed circuit board that has a dielectric substrate provided with H-shape face and one dipole element formed on the dielectric substrate. The printed circuit board is also provided with a balance to unbalanced feed network that is operatively connected to the H-shape dipole arm element. In this design, the H-shape dipole antenna fed network with tapered balun is studied. The design and experimental results of low profile microstrip planar dipole antenna with tapered balun shows fairly good performances in this paper. The feed network of the design with wider bandwidth and lower power loss tapered microstrip line to overlap coplanar stripline (CPS) transition that provided unbalanced to balanced line with balanced equal power output of phase. The achieved planar dipole antenna exhibits 421 MHz for VSWR = 2 bandwidths. Full-wave EM analyses shows good agreement with those experimental data.

Wire antenna for dual wideband cellular phone application

A high performance wire monopole antenna fabricated using two folded and meander wires as radiator is presented. A prototype of the proposed monopole antenna with a compact area size of 46mm×10mm×9mm is implemented, and the antenna shows a wide operating bandwidth of about 273MHz and 557MHz for low band and high band bandwidth, making it easy to cover the GSM, EDGE, CDMA, CDMA 2000, W-CDMA and UMTS band for wireless communication and 2.5G/3G dual mode operation of a mobile handset phone. In this thesis, the study mainly focuses on the current trends in development of compact and low profile multi-media PDA and Smart mobile phone and provides a wideband monopole antenna design suitable for application in wireless communicating system in the near future. By utilizing the monopole antenna structure, the proposed antenna design is easy to be embedded into the mobile phone.