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Patch Antennas (patch + antennas)

Distribution by Scientific Domains
Engineering100%

Kinds of Patch Antennas

  • microstrip patch antennas
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    Selected Abstracts

    Probe-fed microstrip antennas loaded with very high-permittivity ceramics

    INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 5 2006
    Y. Hwang
    Abstract This article reports the feasibility study of miniaturizing probe-fed microstrip patch antennas by dielectric loading. The loading materials are barium tetratitanate ceramics of very high dielectric constant (,r = 38, 80). It is shown that, simply through loading, the antenna sizes are greatly reduced; however, the antenna performances are deteriorated. For instance, the antenna gain becomes lower. Then enhancement of the antenna performances follows. A substrate,superstrate structure is used to recover the gain. Both the experiments and the finite-difference time-domain (FDTD) simulations demonstrate that the gain and impedance bandwidth can be retrieved such that they are comparable to those of conventional microstrip antennas loaded with low permittivity materials (,r < 3). © 2006 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2006. [source]

    TLM modelling of microstrip patch antenna on ferrite substrate

    INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 3 2001
    M. I. Sobhy
    Abstract A new TLM modelling method has been developed for patch antennas on magnetized ferrite substrate. The antenna has magnetically controllable resonance frequency and beam direction. The anisotropic permeability tensor of ferrite is modelled by state equations derived from the Polder tensor. Simulation results agree with measurement. © 2001 John Wiley & Sons, Inc. Int J RF and Microwave CAE 11: 131,139, 2001. [source]

    Low-cost surface-reduction technique for RFID reader antennas

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2010
    Matthieu Egels
    Abstract A low-cost technique for surface reduction of patch antennas is presented. It is based on the slow wave phenomenon. To create slow wave, a frequency selective surface has been burned on the ground plane of a patch antenna. With this technique, a patch antenna has been designed. An antenna for RFID reader at 915 MHz has been designed and simulated. It uses a 1.6-mm-thick FR4 epoxy substrate (,r = 4.5 h = 1.6 mm tan (,) = 0.02) measures 61 mm × 65 mm. His maximum gain is 2 dB. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1469,1471, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25241 [source]

    Design of WiFi/WiMAX dual-band E-shaped patch antennas through cavity model approach

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2010
    Heng-Tung Hsu
    Abstract The design of dual-band, single patch microstrip antenna covering 2.4 and 3.5 GHz for WiFi and WiMAX applications based on E-shaped patch is presented. Although cavity model analysis is included in the design procedure, the slotted configuration is treated as the perturbed cavity to characterize the resonant frequencies of corresponding modes. Additionally, the feed point position is determined through the field distribution resulted from the modal analysis. A new equivalent circuit model based on the coupled resonators theory is proposed for analysis purposes. The relationship between cavity model analysis and antenna resonances is further evidenced by the surface current distributions on the conductors. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 471,474, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24954 [source]

    An X-band microstrip oscillator integrated with frequency-selecting patch antenna

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 8 2009
    D. H. Lee
    Abstract A simple design for microstrip oscillator consisting of an active source and an output patch antenna is presented. The active source is designed to possess negative-resistance over broad bandwidth but not to oscillate without the output patch antenna. Two different source circuits that are potentially unstable over full C-band and X-band are fabricated. Six different-size patch antennas are then connected with each source circuit to demonstrate the oscillation frequency control. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1963,1966, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24481 [source]

    Investigations on microstrip patch antennas with different slots and feeding points

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 11 2008
    S. Bhunia
    Abstract Single layer single feed dual and multifrequency patch antenna is introduced. Resonant frequency can be reduced and frequency ratio can be increased by cutting unequal rectangular slots at the edge. C band and X band operation can be successfully achieved with a size reduction of about 41%. Multifrequency operation can also be achieved by cutting two equal rectangular slots inside the patch. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2754,2758, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23790 [source]

    Small microstrip patch antennas with short-pin using a dual-band operation

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2008
    Cheol Yoon
    Abstract This article presents the design and fabrication of a short-pin dual-band E-shaped microstrip patch antenna for application in a 2.630,2.655 GHz band satellite-DMB with a 5.725,5.825 GHz band wireless LAN. The prototype consist of a short-pin and E-shaped patch. To obtain sufficient bandwidth in VSWR < 2, an air layer is inserted between the ground plane and the substrate. A small short-pin patch that has a dual-band characteristic is used. Important design parameters are the slot's existence, length, the air-gap's height, the feed point's position, and the short-pin's existence and point position. From these optimized parameters, an E-shaped antenna is fabricated and measured. The measured results of the fabricated antenna are obtained individually at 200 and 700 MHz bandwidths in VSWR < 2 referenced to the center frequency, and the individual gain at 8.79 and 10.26 dBi. The experimental 3 dB beam width is shown to be broad across the pass band in the E-plane, and in the H-plane is individually 73°, 65°, 74°, and 42°, respectively. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 367,371, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23099 [source]

    An improved design of harmonic suppression for microstrip patch antennas

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2007
    M. K. Mandal
    Abstract Harmonic suppression is an important factor for active microstrip patch antennas radiating harmonic frequencies. Here, a novel compact low pass filter (LPF) having high filter selectivity and wide stop band is used on the microstrip feed line of the patch antenna. The 15 dB LPF stopband exist over 10 GHz while implementing area is 0.1464,g × 0.1789,g at the cutoff frequency of 3.55 GHz. The fundamental antenna operating frequency falls in the passband of the LPF. The other harmonics falls in the LPF stopband and thus attenuated. An example shows up to fourth harmonic are suppressed while total occupying area remains compact. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 103,105, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22049 [source]

    Analysis of characteristics of a U-slot patch antenna using finite-difference time-domain method

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 9 2006
    Hsing-Yi Chen
    Abstract The finite-difference time domain (FDTD) method is successfully used to analyze characteristics of a U-slot patch antenna without using commercial software packages such as HFSS, IE3D, and CST. The method is proved to be an efficient tool for deep insight studies on complicated patch antennas. Numerical results of return loss, radiation pattern, current distribution, and antenna efficiency are presented. FDTD results are also compared with measurement data and shown to be in good agreement. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1687,1694, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21804 [source]

    A slow-wave structure with Koch fractal slot loops

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2002
    Jung-Hyo Kim
    Abstract In this Letter, a Koch slot loop in the ground plane has been utilized to obtain slow-wave characteristics, and its electrical performances are analyzed with the use of the ABCD matrix approach. The validity of this approach has been verified through experimental results, and this technique was then applied to microstrip patch antennas in order to obtain a small antenna size. The cross-sectional areas of this type of antenna are 47% to 65% smaller than those of conventional square patches. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 34: 87,88, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10381 [source]