Kuo-Liang Wu

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.

Flexible printed circuit board (FPC) antennas for mobile phone operation

In this paper suggestion FPC for antenna design not only easy to control the antenna pattern on desired direction and radiation magnitude but also effective and quickly solved the complex tuning parameters of antenna application. Flexible printer circuit (FPC) board serves planar wireless antenna design. Effectively to supersede the antenna based on the traditional fixed printer circuit board (PCB) implement, and then provide free dimension of antenna and wireless system integration to designer. This paper proposes a new antenna technique for FPC printed monopole antenna as a radiator. This branch lines FPC monopole antenna based on asymmetric meander lines with flexible structure exhibits good performances. Branch lines monopole radiator has the merits to improve antenna bandwidth with fine frequency tuning. The PDA phone for CDMA2000 cellular, PCS, BT/WiFi, and GPS applications is well demonstrated with the integration and measurement of the co-designed.

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.

Flexible printed circuit (FPC) board for mobile antennas operation

In this paper suggestion FPC for antenna design not only easy to control the antenna pattern on desired direction and radiation magnitude but also effective and quickly solved the complex tuning parameters of antenna application. Flexible printer circuit (FPC) board serves planar wireless antenna design. Effectively to supersede the antenna based on the traditional fixed printer circuit board (PCB) implement, and then provide free dimension of antenna and wireless system integration to designer.

Artificial dielectric material and artificial magnetic conductor for emerging PCB application

Artificial materials of periodic dielectrics exhibiting an electromagnetic band-gap (EBG) performance have been proposed and applied antenna co-design and measurement. The artificial dielectric material (ADM) can enhance antenna performance. The artificial defected dielectric material has useful characteristics of harmonic rejection, band suppression and surface wave suppression. And then the design of an artificial magnetic conductor (AMC) for antenna application is present. Artificial materials of periodic structure exhibiting an electromagnetic band-gap (EBG) performance have been proposed and applied antenna co-design and measurement. Those artificial PCB can enhance antenna radiation performance, spread antenna bandwidth and improve antenna radiation gain and efficiency.

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.

A novel pogo pin connector design for high speed USB3.1 operations

A high performance connector and USB3.1 gen2 co-design fabricated using pogo pin and new RF pin structure are presented. A prototype of the proposed pogo pin connector with a compact area size of 1.8mm pitch is implemented, and the pogo pin connector shows a wide operating bandwidth, making it easy to cover the USB 3.1 gen1 and gen2 for high speed connector operation.

Wire antenna for dual band WLAN application

A high performance wire monopole antenna fabricated using two meander wires as radiator is presented. A prototype of the proposed monopole antenna with a compact area size of 24mm×10mm is implemented, and the multi-band WLAN antenna shows a wide operating bandwidth of about 637MHz and 1000MHz for low band and high band, bandwidth, making it easy to cover the IEEE 802.11a, IEEE 802.11b, IEEE 802.11g and IEEE 802.11n (MIMO) bands for wireless communication and future 4G wireless operation of a mobile VoIP/VoWLAN handset phone.