An influx of research has been devoted to use different di-electric substrate materials for antenna miniaturization. Design of A modified W-shaped ka band antenna on Al2O3 ceramic substrate is presented in this paper. The W shape is obtained from slotted conventional rectangular shaped patch. The ceramic substrate made with Aluminum oxide (Al2O3) with high dielectric constant and 1.5 mm thickne...

In this paper, a special algorithm is developed to accomplish segmentation for the Arabic speech based on energy level of the uttered words or sentences. In Arabic language, phonemes can be divided into two energy regions: unvoiced phonemes are categorized as low energy, for example, the sounds / س / (/s/) and / ـه / (/h/); On the other hand, vowels and semi-vowels such as / _َ / ) هحتف ( (/ ‘a ...

In this paper, we describe the design and experimental results from the rebuild of a 250 GHz gyrotron used for Dynamic Nuclear Polarization enhanced Nuclear Magnetic Resonance spectroscopy on a 380 MHz spectrometer. Tuning bandwidth of approximately 2 GHz is easily achieved at a fixed magnetic field of 9.24 T and a beam current of 95 mA producing an average output power of >10 W over the entire...

This paper presents a 2-GHz tunable direct sampling receiver with 40-GHz sampling clock and on-chip PLL, fabricated in a production 130-nm SiGe BiCMOS process. The measured SFDR and SNDR are 59 dB and 59.84 dB, respectively, over a bandwidth of 60 MHz, and the effective number of bits (ENOB) equals 9.65. Compared to the case where an external low-noise 40-GHz clock was used, no SNDR degradation...

A dual and quad element antenna array resonating at 2.4 GHz with narrow beam is proposed in this paper. An intention to put forward this work is to make use of microstrip patch antennas in beamforming to form directional beams in analog and digital domains; reducing co-channel / multipath interferences and improving Quality of Service (QoS) for senor arrays and 3G wireless networks. The size of...

W-band wireless transmission has attracted a lot of interest due to its wider available bandwidth (i.e. 75-110 GHz). In this article, we propose a direct-detection orthogonal frequency division multiplexing radio over fiber (OFDM-RoF) system via two cascaded single-drive MZMs at center frequency of 103 GHz. We discuss maximum bandwidth of different modulation formats under forward error correct...

Integration of multi-mode multi-band transceivers on a single chip will enable low-cost millimeter-wave systems for next-generation automotive radar sensors. The first dual-band millimeter-wave transceiver operating in the 22–29-GHz and 77–81-GHz short-range automotive radar bands is designed and implemented in 0.18m SiGe BiCMOS technology with of 200/180 GHz. The transceiver chip includes a du...

We report further progress on the development of a photonic mm-wave waveguide source suitable for application as a phase reference and as a local oscillator. The mmwave power was generated in a W-band waveguide mount by the beating of two 1.55 μm laser beams in a modified commercial photodiode. Maximum optical to mmwave power conversion efficiency of 1.8% was measured at 75 GHz, where an input ...

This paper presents a reflection-type phase shifter (RTPS) at W-band in a 0.13 μm complementary metal oxide semiconductor (CMOS) process. The RTPS is composed of a 90° hybrid coupler and two identical reflection loads. Lumped-distributed element transmission line is introduced in the 90° hybrid coupler to reduce the chip size. Series inductor-capacitor (LC) resonators are used as the reflective...