1993 documents found.

Ultra-low noise active microstrip antenna
Mahmoud Abdipour, Gholamreza Moradi, Reza Sarraf Shirazi
Published online : 01-10-2014
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An active receiving antenna for Radio Navigation and Radio Positioning applications in S-band frequency is designed and fabricated. In this active antenna, the amplifier is integrated with the radiator which is a rectangular patch antenna. This patch antenna is analyzed with full-wave momentum method. With the developed design routine, ultra-low noise active receiving antenna can be realized. The
applied to the optimal design of multi-stub matching network and a meander monopole
Nihad Dib, Ashraf Sharaqa, Richard A. Formato
Published online : 01-10-2014
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Variable , a new concept in antenna design and optimization, is applied to two optimization problems: a multi-stub matching network (MSMN) using biogeography-based optimization (BBO), and an ultra wideband meander monopole antenna (MMA) using central force optimization (CFO). BBO is a newly-proposed stochastic global search and optimization evolutionary algorithm (EA) used to deter
Gain enhancement over a wideband in CPW-fed compact circular patch antenna
Kirti Vyas, Garima Sanyal, Arun Kumar Sharma, Pramod Kumar Singhal
Published online : 01-10-2014
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The present paper reports the gain enhancement over a wideband (12?15 GHz) in a coplanar waveguide (CPW)-fed circular patch antenna with circular defected ground structure (DGS). Two compact coplanar circular antennas have been designed and fabricated with and without DGS of same volume 18 × 20 × 1.6 mm, built over FR4-epoxy substrate (? = 4.4). Gain enhancement has been achieved by optimizing the
Using parasitic elements for implementing sectoral patch antenna array for wireless applications
Abhishek Kandwal, Sunil Kumar Khah
Published online : 01-10-2014
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This paper presents the design and development of an X-band microstrip gap-coupled sectoral patch array antenna for application in wireless systems. A novel concept of bandwidth enhancement is considered for gap-coupled sectoral microstrip patch array antenna, which uses one active receiving antenna and multiple parasitic elements with finite ground plane. The parasitic elements give the possibili
MRF volume 6 issue 3-4 Cover and Back matter
Manfred Berroth, Arne F. Jacob, Lorenz-Peter Schmidt
Published online : 01-05-2014
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MRF volume 6 issue 3-4 Cover and Front matter
Manfred Berroth, Arne F. Jacob, Lorenz-Peter Schmidt
Published online : 01-05-2014
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EuMW special issue
Manfred Berroth, Arne F. Jacob, Lorenz-Peter Schmidt
Published online : 01-05-2014
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Millimeter-wave hetero-integrated sources in InP-on-BiCMOS technology
Thomas Jensen, Thualfiqar Al-Sawaf, Marco Lisker, Srdjan Glisic, Mohamed Elkhouly, Tomas Kraemer, Ina Ostermay, Chafik Meliani, Bernd Tillack, Viktor Krozer, Olaf Krueger, Wolfgang Heinrich
Published online : 01-05-2014
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The paper presents millimeter-wave (mm-wave) signal sources using a hetero-integrated InP-on-BiCMOS semiconductor technology. Mm-wave signal sources feature fundamental frequency voltage-controlled oscillators (VCOs) in BiCMOS, which drive frequency multiplier?amplifier chains in transferred-substrate (TS) InP-DHBT technology, heterogeneously integrated on top of the BiCMOS wafer in a wafer-level
A Ku-band RF-MEMS frequency-reconfigurable multimodal bandpass filter
Adrián Contreras, Jasmina Casals-Terré, Lluís Pradell, Flavio Giacomozzi, Jacopo Iannacci, Miquel Ribó
Published online : 01-06-2014
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In this paper, a uniplanar RF-MEMS second-order bandpass filter with reconfigurable center frequency is presented. It is based on quarter-wavelength slotline resonators and coplanar waveguide (CPW)-to-slotline multimodal immitance inverters (MIIs), which are reconfigured using RF-MEMS switchable CPW air-bridges (SABs). The filter can be adequately explained and designed using multimodal theory and
Evaluation of GaN-HEMT power amplifiers using BST-based components for load modulation
Mhd. Tareq Arnous, Alex Wiens, Paul Saad, Sebastian Preis, Zihui Zhang, Rolf Jakoby, Georg Boeck
Published online : 01-06-2014
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In this paper, the concept of load-modulated power amplifiers (PAs) is studied. Two GaN-HEMT power amplifiers (PAs), targeted for high efficiency at maximum and output back-off (OBO) power levels, are designed, implemented, and tested across 1.8?2.2 GHz. The load modulation in the first design is realized by tuning the shunt capacitors in the output matching network. A novel method is employed in