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Feed Structure (feed + structure)
Selected AbstractsCharacteristic analysis of reverse-L-shaped microstrip-fed large-bandwidth printed slot antennaINTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 6 2002Yong-Woong Jang Abstract The characteristics of a reverse-L-shaped microstrip-fed structure is analyzed using the finite difference time domain method, and the characteristics of the proposed antenna are compared with a conventional antenna. The return loss, radiation resistance, and voltage,standing wave ratio in the frequency domain are calculated by Fourier transforming the time domain results. When the proposed feed structure is used, the bandwidth is extended in proportion to the slot width and the radiation resistance has the low value. When the slot width is 16 mm, the experimental bandwidth is approximately 50% (,10 dB , S11) at the center frequency of 2.3 GHz. In addition, the experimental data for the impedance and radiation pattern of the antenna are described. They are in good agreement with the calculated results. © 2002 Wiley Periodicals, Inc. Int J RF and Microwave CAE 12, 496,502, 2002. Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mmce.10055 [source] Broadband built-in antenna with new enclosed 3D coupling feed structureMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2010Byoung-Nam Kim Abstract Wideband built-in antenna with an enclosed 3D coupling feed structure for wireless terminals is presented. With the proposed design scheme, a nine-band built-in antenna that covers GSM850/GSM900/GPS/DCS1800/PCS1900/WCDMA/WiBro2350/Bluetooth/WiMax 2500 is experimentally tested. This novel nine-band built-in handset antenna is developed within the limits of a 40 × 17.5 × 6 mm3 volume, achieving good agreement between measurement and simulation. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2306,2309, 2010; Published online in Wiley InterScience (www.interscience. wiley.com). DOI 10.1002/mop.25441 [source] A low cost miniaturized circularly polarized antenna for UHF radio frequency identification reader applicationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2009Zhongbao Wang Abstract A low cost miniaturized CP antenna is proposed for UHF RFID (Radio Frequency Identification) reader applications. The antenna is composed of a vertical ground and a square-ring patch with truncated corners. A novel capacitively coupled feed structure is proposed for good impedance matching. The antenna has S11 < ,20 dB and a gain level of about 6.9 dBi at 920,925 MHz (Chinese RFID band). Comparing to the conventional CP antenna, the size of the proposed antenna can be reduced by 33%. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2382,2384, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24612 [source] Substrate-integrated-waveguide feed network for microstrip antenna arraysMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2009Mohsen Yousefbeigi Abstract In this article, a low-loss parallel-series feed structure using substrate integrated waveguide (SIW) technology for a single-layer microstrip antenna array is presented. In addition to reduction of feed radiation, the feed network benefits from typical advantages of planar structures such as compactness, low cost, integrability, and mass-producibility. A 2 × 8 microstrip antenna array of size 109 mm × 34 mm fed by the proposed SIW feed system is designed and fabricated. Measurements on the fabricated array verify a minimum gain of 17.5 dBi in the frequency range of 17.4 to 18 GHz. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1619,1621, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24412 [source] Compact dual-band filter design using crossly coupled ,/4 SIRs embedded with spur-line for WLAN applicationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 11 2008Pow-Wen Chen Abstract This article presents a compact dual-band bandpass filter (BPF) design using ,/4 stepped impedance resonators (SIRs) embedded with spur-line for the WLAN applications. The filter covers both the operating frequencies of 2.45 GHz and 5.2,5.8 GHz. The crossly coupled mechanism is used in the filter design to provide attenuation poles by the passband edges for enhancing the signal selectivity and increasing stopband rejection levels. The tapped-line is incorporated in feed structure to save the circuit space. The spur-line is embedded in each I/O SIRs to push the upper stopband limit to a higher frequency. Experiments are conducted to verify the circuit performance. A good agreement is observed between the simulation and the measurement. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2807,2810, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23846 [source] Surface-mount loop antenna for AMPS/GSM/DCS/PCS operation in the PDA phoneMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 9 2007Wei-Yu Li Abstract A surface-mount loop antenna very suitable for application in the mobile devices such as the PDA (Personal Digital Assistant) phone for quad-band operation is presented. The antenna comprises of a loop metal pattern for generating two wideband resonant modes at about 900 and 1800 MHz to cover the AMPS/GSM/DCS/PCS bands and a central coupling stub as the feed structure. Although quad-band operation is obtained, the antenna occupies a small volume of 7 × 8 × 60 mm3 or about 3.4 cm3 only and is easy to be embedded inside the PDA phone as an internal antenna. Details of the proposed surface-mount loop antenna are presented and discussed. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2250,2254, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22700 [source] Microstrip dual-band bandpass filter using slow-wave resonators for WLAN applicationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2007Xuehui Guan Abstract A dual-band bandpass filter using microstrip slow-wave resonators is developed for wireless local area network applications. The fundamental and higher order resonant harmonics of a microstrip open-loop resonator are analyzed against the length of the loading open stub. Then a dual-band bandpass filters is designed in the form of slow-wave open-loop resonators. A zero-degree feed structure is employed to produce transmission zeros near the passband to increase the rate of attenuations, and a quarter-wavelength feed line for impedance matching is added to get desired external quality factor at the input and output. The theoretical analysis and design procedures are successfully verified by experimental results. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 14,16, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22055 [source] | ||||||||||