A novel compact quad-band internal antenna for mobile handsets operating the , GPS (1575 Ϯ 10 MHz), DCS (1710 -1880 MHz), and PCS (1850 -1990 bands is proposed and implemented. The proposed antenna consists of a feeding strip, shorting strip, and folded loop radiating element with embedded tuning notches. Embedding the notches changes the current flow on the surface of the loop radiator so that the resonant frequencies can be controlled independently by their size and position. The measured impedance bandwidth (VSWR Ͻ 2) of the proposed antenna is 11.3% at GSM band and 27.4% at higher bands including GPS/DCS/PCS. The measured peak gains are 0.51, 2.06, 0.52, and 1.34 dBi, at the GSM, GPS, DCS, and PCS bands, respectively. ABSTRACT: We describe high-efficiency gratings illuminated by incident lights in the C ϩ L bands as the (de)multiplexers for dense wavelength division multiplexing (DWDM) application. This grating is fabricated in fused silica and replicate in polydimethylsiloxane (PDMS) and polyethylene terephthalate glycol (PETG) with the technology of nanoimprint.

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A compact multiband internal antenna for mobile handset applications is proposed. Multiband operation is realised by two connected patches in the lower frequency band and wide band characteristics in the higher frequency band. The simulated and measured results show that the proposed antenna can effectively cover GSM, GPS, DCS, PCS, UMTS, Bluetooth/WiFi, and SDMB bands. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 176–179, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22077

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The use of relatively small cavities of any shape is introduced for radiation efficiency measurements. Numerical simulations clearly show that the AUT location in the cavity does not change the estimation of radiation efficiency. To take into account cavity losses, a modified Huynh formulation is more adapted at high frequencies than the classical one. Both assumptions are strongly consistent with numerical and experimental results, which are based on antenna measurements in different shapes cavities. 2. P.-S. Kildal, K. Rosengren, J. Byun, and J. Lee, Definition of effective diversity gain and how to measure it in a reverberation chamber,