Results 81 to 90 of about 152,070 (212)
Design and analysis of reconfigurable filters employing varactor and PIN diodes [PDF]
Engineering and Technology JournalThis work presents a comprehensive and comparative study on reconfigurable/tunable microstrip filters, aiming to analyze and understand the impact of varactors, PIN diodes, lumped capacitors, and inductors on the overall filter performance.
Salah Mahdi +2 more
doaj +1 more source
Photoresponse of area-variable varactor diode
Electronics Letters, 1996 Photoresponses and microwave characteristics of an area-variable varactor diode are investigated in the frequency range up to 7 GHz. It is demonstrated that the on/off ratio of its capacitance corresponds to 18.5 at 1 GHz. The capacitance is also significantly altered by photoillumination, and a maximum on/off ratio of 450% is achieved at 1 GHz with ...
null Kim, null Kwon, null Hong
openaire +1 more source
A Tunable Single-Feed Triple-Band LTE Antenna With Harmonic Suppression
IEEE Access, 2019 This paper presents a single-feed planar inverted-F antenna (PIFA) that operates at three resonant frequencies within the LTE frequency range which would result in the enhancement of the antenna bandwidth and the increase of the data-rate speed.
Abdullah J. Alazemi, Gabriel M. Rebeiz
doaj +1 more source
PIFA based reconfigurable multiband antenna for wireless applications [PDF]
, 2010 Copyright @ 2010 IEEEA compact reconfigurable four bands Planar Inverted-F Antenna (PIFA) is presented for Digital Video Broadcasting - Handheld (DVB-H), Universal Mobile Telecommunications System (UMTS), Global System for Mobile Communications (GSM800 ...
AbuTarboush, HF +5 more
core +1 more source
Tunable Band Notched UWB Antenna With Wide Tuning Range and Notch Bandwidth Controllability
IEEE AccessAn ultra-wide band (UWB) antenna employing spoof surface plasmon polariton principles is introduced, offering tunable single- and dual-band rejection. Inserting slot resonators into the SSPP feed achieves band-notching.
Somia Sharma +2 more
doaj +1 more source
Millimeter-and submillimeter-wave multipliers using quantum-barrier-varactor (QBV) diodes
, 1990 Experimental results are presented using quantum-barrier-varactor (QBV) diodes in harmonic multipliers. Output powers and tripler conversion efficiencies of more than 2 mW and 5%, respectively, were achieved between 210 and 280 GHz. In a crude experiment,
Rydberg, Anders, +7 more
core +1 more source
A New Two-Port MIMO Filtenna With Tunable Bandwidth and Center Frequency
IEEE AccessA new two-port MIMO filtenna with center frequency and bandwidth tunability is introduced by integrating a tunable filter into the feeding section of a monopole antenna.
Alper Turkeli +3 more
doaj +1 more source
A Wideband Subharmonic Image-Reject Mixer With a Fixed IF Using Schottky Diodes
IEEE Journal of MicrowavesThis work presents a Schottky anti-parallel diode pair (APDP)-based wideband subharmonic image-rejecting mixer (SH-IRM) with high image rejection and port-to-port isolation.
Rijubrata Pal, Mrinal Kanti Mandal
doaj +1 more source
, 2007 A varactor diode for a ultra-high-frequency (UHF) TV tuner that can be operated within 5V of tuning voltage (VT) is presented. The fabricated diode has a shallow junction with a heavily doped p++ region on a steep hyperabrupt n+ region.
Shon, Yeong Soo, Choi, S.-Y., Kim, H. S.
core +1 more source
Comparison of Antennas Electrical Tuning Methods for Mobile Applications
Известия высших учебных заведений России: Радиоэлектроника, 2017 The various methods of antenna electrical tuning for mobile handsets working in several LTE frequency bands are described. The PIFA-type antenna containing high and low frequency branches is proposed.
A. D. Grigoriev, B. Djalilov
doaj