The Experts below are selected from a list of 51708 Experts worldwide ranked by ideXlab platform

Fu-shun Zhang - One of the best experts on this subject based on the ideXlab platform.

  • a frequency diversity printed yagi antenna element for apertures selectivity wideBand array application
    IEEE Transactions on Antennas and Propagation, 2018
    Co-Authors: Fukun Sun, Fu-shun Zhang, Hongyin Zhang, Hanjing Zhang, Chaoqiang Feng
    Abstract:

    A wideBand frequency diversity printed-Yagi antenna array is presented. The Operating Band of the single port L-/S-Bands antenna element can be selected by changing the states of p-i-n diode switches. The L- and S-Bands work independently. A $4 \times 4$ S-Band array can be constituted to a $2 \times 2$ L-Band array by modifying the element apertures. This array operates at 1–2 GHz/2–4 GHz in the L-/S-Bands with a fractional Bandwidth of 66.7%/66.7%, which is translated into an overall tuning ratio of 4:1. The spacing of adjacent antenna elements at each reconfigurable mode is less than $0.72\lambda _{0}$ ( $\lambda _{0}$ represents the free-space wavelength of the highest frequency in the Operating Band), which achieves no grating lobes in the radiation field. The proposed antenna array is simulated, fabricated, and tested with reasonable agreement between measurements and simulations. In this way, a rudiment of wider tuning ratio array is designed for wideBand reconnaissance applications.

  • A modified umbrella-shaped monopole antenna for multi-Band operation
    Proceedings of 2011 IEEE CIE International Conference on Radar, 2011
    Co-Authors: Fu-shun Zhang, Jian Wang
    Abstract:

    A novel multi-Band monopole antenna that consists of Umbrella-shaped patch and slots cut out of the ground, fed by 50-Ω microstrip feed line is introduced. The antenna has simple structure with dimensions of 40 mm×40 mm. The simulated impedance Bandwidth for -10 dB return loss is from 2.26 to 2.56 GHz, from 3.35 to 3.6 GHz, from 5.12 to 5.37 GHz and from 5.65 to 6.05 GHz, respectively, covering the 2.4/5 GHz WLAN and WiFi Operating Band and 3.5 GHz WiMAX Operating Band. Also, the omni-directional pattern, good gain, and broad Bandwidth performance over the Operating Bands have been obtained.

  • An 8-element Tapered Slot Antenna Array with a Bandwidth in Excess of 16.5:1
    2010
    Co-Authors: Yue Song, Yong-chang Jiao, Nai-biao Wang, Tian-ling Zhang, Fu-shun Zhang
    Abstract:

    A one-dimension single-polarized tapered slot antenna array fed by microstrip line is proposed. A modifled transformer is used to obtain the impedance matching from microstrip line to slot line in the Operating Band. A 1:8 microstrip line power divider is designed to feed the 8-element array. The experimental results also show that the proposed antenna array achieves a ratio impedance Bandwidth of 16.5:1 for VSWR • 2 from 0.8 to 13.2GHz, and exhibits good radiation patterns over the Operating Band that the cross polarized levels are better than 15dB.

Daniel H. Schaubert - One of the best experts on this subject based on the ideXlab platform.

  • Parameter study and design of wide-Band widescan dual-polarized tapered slot antenna arrays
    IEEE Transactions on Antennas and Propagation, 2000
    Co-Authors: Tan-huat Chio, Daniel H. Schaubert
    Abstract:

    A parameter study of dual-polarized tapered slot antenna (TSA) arrays shows the key features that affect the wide-Band and widescan performance of these arrays. The overall performance can be optimized by judiciously choosing a combination of parameters. In particular, it is found that smaller circular slot cavities terminating the bilateral slotline improve the performance near the low end of the Operating Band, especially when scanning in the H-plane. The opening rate of the tapered slotline mainly determines the mid-Band performance and it is possible to choose an opening rate to obtain balanced overall performance in the mid-Band. A longer tapered slotline is shown to increase the Bandwidth, especially in the lower end of the Operating Band. Finally, it is shown that the H-plane anomalies are affected by the array element spacing. A design example demonstrates that the results from the parameter study can be used to design a dual-polarized TSA array with about 4.5:1 Bandwidth for a scan volume of not less than θ=45° from broadside in all planes

Tan-huat Chio - One of the best experts on this subject based on the ideXlab platform.

  • Parameter study and design of wide-Band widescan dual-polarized tapered slot antenna arrays
    IEEE Transactions on Antennas and Propagation, 2000
    Co-Authors: Tan-huat Chio, Daniel H. Schaubert
    Abstract:

    A parameter study of dual-polarized tapered slot antenna (TSA) arrays shows the key features that affect the wide-Band and widescan performance of these arrays. The overall performance can be optimized by judiciously choosing a combination of parameters. In particular, it is found that smaller circular slot cavities terminating the bilateral slotline improve the performance near the low end of the Operating Band, especially when scanning in the H-plane. The opening rate of the tapered slotline mainly determines the mid-Band performance and it is possible to choose an opening rate to obtain balanced overall performance in the mid-Band. A longer tapered slotline is shown to increase the Bandwidth, especially in the lower end of the Operating Band. Finally, it is shown that the H-plane anomalies are affected by the array element spacing. A design example demonstrates that the results from the parameter study can be used to design a dual-polarized TSA array with about 4.5:1 Bandwidth for a scan volume of not less than θ=45° from broadside in all planes

Kin-lu Wong - One of the best experts on this subject based on the ideXlab platform.

  • hybrid dual antenna for the 3 6 ghz lte operation in the tablet computer
    Microwave and Optical Technology Letters, 2015
    Co-Authors: Kin-lu Wong, Hsuanjui Chang
    Abstract:

    A hybrid dual-antenna formed by an inverted-F antenna (IFA) and an open-slot antenna (OSA) for the 3.6-GHz LTE operation (3.4–3.8 GHz) in the tablet computer is presented. The dual-antenna is printed on a 0.8-mm thick FR4 substrate and has a compact planar structure of 4 × 30 mm2. The dual-antenna comprises a clearance region wherein the IFA is disposed and a metal pad wherein the OSA is embedded. The IFA's shorting strip is grounded through the metal pad to the device ground plane, so that an integrated compact dual-antenna structure is obtained. As the IFA and OSA have different excitation mechanisms (electric-current excitation on the IFA vs. magnetic-current excitation on the OSA), the two antennas are expected to have different near-field characteristics, thereby leading to decreased coupling. The proposed dual-antenna has a measured isolation of better than about 12 dB over the Operating Band. The IFA and OSA have measured antenna efficiencies of about 72%–86% and 57%–78%, respectively. Good envelope correlation coefficient of less than 0.1 is obtained. Over the Operating Band, the ergodic capacity of the dual-antenna is calculated to be about 9.8–10.6 bps/Hz. Details of the proposed dual-antenna are presented. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2592–2598, 2015

  • planar monopole with a coupling feed and an inductive shorting strip for lte gsm umts operation in the mobile phone
    IEEE Transactions on Antennas and Propagation, 2010
    Co-Authors: Chengtse Lee, Kin-lu Wong
    Abstract:

    A planar monopole having a small size yet providing two wide Bands for covering the eight-Band LTE/GSM/UMTS operation in the mobile phone is presented. The small-size yet wideBand operation is achieved by exciting the antenna's wide radiating plate using a coupling feed and short-circuiting it to the system ground plane of the mobile phone through a long meandered strip as an inductive shorting strip. The coupling feed leads to a wide Operating Band to cover the frequency range of 1710-2690 MHz for the GSM1800/1900/UMTS/LTE2300/2500 operation. The inductive shorting strip results in the generation of a wide Operating Band to cover the frequency range of 698-960 MHz for the LTE700/GSM850/900 operation. The planar monopole can be directly printed on the no-ground portion of the system circuit board of the mobile phone and is promising to be integrated with a practical loudspeaker. The antenna's radiating plate can also be folded into a thin structure (3 mm only) to occupy a small volume of 3 × 6 × 40 mm3 (0.72 cm3) for the eight-Band LTE/GSM/UMTS operation; in this case, including the 8-mm feed gap, the antenna shows a low profile of 14 mm to the ground plane of the mobile phone. The proposed antenna, including its planar and folded structures, are suitable for slim mobile phone applications.

  • Ultra-wideBand PIFA with a capacitive feed for penta-Band operation in the folder-type mobile phone
    2008 IEEE Antennas and Propagation Society International Symposium, 2008
    Co-Authors: Kin-lu Wong
    Abstract:

    A novel planar inverted-F antenna with a capacitive feed to generate a very wide Operating Band for penta-Band operation in the folder-type mobile phone has been proposed. The antenna is simple in geometry and occupies a compact volume to allow it to be easily embedded inside the housing of the mobile phone to operate as an internal antenna. For both the open (in-use) and close (standby) states of the folder-type mobile phone, the obtained Bandwidth of the antenna can cover GSM850/900/1800/1900/UMTS operation. Good radiation efficiency over the Operating Band has also been obtained.

P C Strickland - One of the best experts on this subject based on the ideXlab platform.