Multi-band monopole antenna using meander structure for handheld terminals

A multi-band monopole antenna with wideband characteristic is proposed for DVB-H/DCS1800/PCS1900/IMT2000/Wibro/WLAN/ S-DMB applications. By using a meander structure and tapered feeding line, wideband characteristic can be achieved. The proposed antenna has an omnidirectional radiation pattern and yields greater than -4 dBi of antenna gain at the DVB-H band and 3 dBi for high- band, respectively.     

Multiple meander strip monopole antenna

A novel multiple meander strip monopole antenna is presented. By iteratively meandering the vertical strip, compactness and broadband characteristics for the monopole antenna were achieved simultaneously. The designed monopole antenna with a radiation element volume of 14/spl times/14/spl times/14 mm/sup 3/ has the measured bandwidth ratio of 3.87:1, from 2.83 to 10.96 GHz for VSWR/spl les/2, with fairly frequency-insensitive omni-directional radiation characteristics.     

Compact stripline-fed meander slot antenna

A meander-type slot antenna fed by a stripline is proposed for use in miniaturised personal communication systems. By varying the slot configuration of the antenna, a 56% smaller antenna to substitute the conventional slot antenna is achieved. Simulated and measured results are presented     

Miniaturisation of rectangular loop antenna using meander line for RFID tags

A small rectangular loop antenna (RLA) for RFID tags has been designed and fabricated for the UHF band. As the structure of a meander line and a folded meander line is applied in a general RLA, the RLA is miniaturised. The size reduction rate of meander line RLA and folded meander line RLA are 85.4 and 92.2% compared with a general RLA, respectively. The radiation patterns are omnidirectional in the z-y plane (horizontal pol.). Also the gain of the meander line RLA and folded meander line RLA are -2.47 and -4.01 dBd, respectively     

Size reduced meander line annular ring microstrip antenna

A method to reduce the size of the annular ring microstrip antenna is presented. A parametric study shows a very large size reduction can be achieved.     

Compact microstrip-fed meander slot antenna for harmonic suppression

A novel compact microstrip-fed meander slot antenna is proposed to achieve suppression of harmonics and miniaturisation of the antenna. To obtain these characteristics, a meander-type slot radiator and U-shaped conductor line connected with the ground plane are applied. The real parts of the measured input impedance at the second- and third-harmonic frequencies are nearly zero. In the measured radiation patterns in E- and H-plane, the second- and third-harmonic suppressions are observed to be approximately less than -30 dB.     

Modified meander line monopole antenna for broadband operation

A modified meander line monopole antenna is presented for broadband operation. The impedance and radiation characteristics of the antenna are investigated. The proposed antenna achieved a bandwidth of approximately 845 MHz with S₁₁< -10 dB, which covered the GPS, DCS, PCS, UMTS and WiBro bands. The electrical characteristics of the proposed antenna appear to be attractive for mobile terminals and repeater applications.     

Stress-voiding of narrow conductor lines

The growth of voids in conductor lines that have no applied voltage nor imposed thermal or concentration gradients is examined. Such voids can cause narrow aluminium conductors in silicon ICs to fail spontaneously. Recent attempts to describe void growth mathematically as a stress-driven diffusive phenomenon are reviewed, and an expression for the time dependent void size is derived. The equation is used to explore the many variables of the void-growth problem     

Compact varactor-tuned meander line monopole antenna for DVB-H signal reception

A compact varactor-tuned meander line monopole antenna for DVB-H signal reception is presented. The operating frequency of the antenna is continuously tuned over the frequency range of the DVB-H standard 470-702 MHz. The antenna has an omnidirectional radiation pattern and covers the frequency range with requisite impedance bandwidth and gain level. The antenna element occupies a very small volume (0.7 cm³ ) and can be used in 40 x 100 x 10 mm devices.     

Frequency-scanning antenna using the crosstie-overlay slow-wavestructures as transmission lines

Crosstie-overlay slow-wave transmission lines are used in a traveling-wave antenna array to reduce the circuit size. Series connection of the antenna radiation elements and transmission lines makes the antenna integratable. These two properties make the antenna suitable for microwave monolithic integrated circuit (MMIC) elements. The measured radiation pattern is shown to agree with the calculated pattern. The antenna's frequency-scanning feature is demonstrated     

CPW-Fed UWB antenna with sharp and high rejection multiple notched bands using stub loaded meander line resonator

This paper presents a CPW-fed UWB filter-antenna with sharp and high rejection multiple band notches for band-notched UWB communication applications. The band notch operation is achieved by employing a sharp bandstop filter (BSF) with multiple reject bands using only one element meander line resonator at the bottom layer through theoretical calculations and parametric studies. The adjustment of the notched bands is successfully accomplished by loading the meander line with open ended stubs to modify the harmonic frequencies to the desired bands. The structure of the proposed BSF is simple and compact so that the proposed filter-antenna is achieved with the same size of the reference UWB antenna without an extra area. Measurement results show that the proposed filter-antenna has two notches at the WiMAX systems operating in the 5.8 GHz (5.725–5.85 GHz) and at the international telecommunication union (ITU) operating in the 8.2 GHz (8.025–8.4 GHz). Also, it has sharp rejection characteristics at the edges of the federal communication commission (FCC) band for UWB communications. The experimental measurements are in good agreement with theoretical and simulation results for the BSF and the filter-antenna. Moreover, the filter-antenna exhibits stable omnidirectional radiation patterns except at the notched bands.     

Planar meander sleeve monopole antenna for DVB-H/GSM mobile handsets

A novel planar meander sleeve monopole antenna for digital video broadcasting-hand held (DVB-H) and GSM mobile handsets is presented. By using the planar sleeve monopole type radiating element constructed with meander strips, the antenna provides a degree of miniaturisation while retaining a wide bandwidth covering the DVB-H and GSM-900 bands. A prototype is constructed and tested, which shows that an impedance bandwidth of 498 MHz (463-961 MHz) within 2.5:1 VSWR is achieved.     

Miniaturised CPW-fed circularly polarised corrugated slot antenna with meander line loaded

A novel CPW-fed circularly polarised antenna with corrugated structure and meander line loaded is presented. This antenna can achieve 44% size reduction compared to the conventional CPW-fed slot antenna. Predicted results are validated by experiment. The measured 3 dB axial ratio bandwidth and the 10 dB return loss bandwidth are 12.4 and 17.1%, respectively. The peak gain of the antenna is 4.0 dBi.     

A PLANAR ANTENNA OF CONDUCTOR MODULATING PERIODIC STRUCTURE

A novel planar leaky-wave antenna of conductor modulating periodic structure formillimeter wave application is proposed.Using the theory of two-dimensional periodic admittancesurface,theoretical analysis,numerical calculation and experimental study are carried out for thiskind of antenna.A planar antenna of conductor modulating periodic structure is realized in 8mmwave band.It has an aperture area of 90×90mm~2.The measured performances of the antennaare good.     

Compact oscillating slot loop antenna with conductor backing

An oscillating slot loop antenna working at 4.02 GHz is realised with a low cost GaAs MESFET. A conductor backing is used to obtain a unidirectional radiation pattern     

Double rectangular meander line loop monopole antenna for miniaturisation and bandwidth

The aim of this reported work was to achieve miniaturisation of an antenna for a wireless mic system covering the 216-224 MHz band. A double rectangular loop structure using a meander line was applied for size reduction and the broad bandwidth of the antenna. As a result of the installation of the mic, a length reduction ratio of 91.3% at 221 MHz and -10 dB bandwidth of 9.85 MHz (4.45%) were obtained.     

小型化低温共烧陶瓷片式天线研究

提出一种适用于蓝牙频段的小型化全向天线。该天线采用低温共烧陶瓷(LTCC)技术,将金属导线按曲折走线的方式内埋于LTCC微波陶瓷介质中,上下层导线通过通孔实现互连,有效缩小了体积,并保护了天线辐射单元以提高可靠性。通过分析天线三维结构,提取了天线等效电路模型,电磁场仿真与电路仿真结果基本一致。与传统天线相比,该天线具有全向性好、带宽大、性能稳定等优点,且外形短小紧凑,适用于对天线尺度要求比较苛刻的各种高灵敏度、低剖面的无线通信收发模块及移动通信终端。     

Pattern reconfigurable double folded slot antenna with background conductor

A novel pattern reconfigurable double folded slot antenna is presented. The antenna can work in three modes and their 3 dB beam widths can entirely cover the upper half space by implementing the tuning elements of the antenna. Simulated results are compared with measured data and good agreement is obtained.     

Broadband multilayer ceramic chip antenna for handsets

A novel broadband and small multilayer ceramic chip antenna has been designed and investigated. The proposed antenna has a small size of 14×2.4×1 mm³. A wide bandwidth of 33% (VSWR<2.0) has been obtained, and the measured antenna gain has an average value of ~1.2 dBi. These characteristics make the proposed antenna applicable to future mobile handsets