Microstrip Patch Antennas (microstrip + patch_antennas)

Distribution by Scientific Domains


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]


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]


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]