Modernization of DVB-S2 Standard Using Signal-Code Constructions Based on Amplitude Modulation of Many Components

It is proposed to modernize the DVB-S2 standard by using AMMC (amplitude modulation of many components) signals instead of 8PSK (8-phase shift keying) and APSK (amplitude-phase shift keying) signals, and to modernize the DVB-S2 standard equipment by using the AMMC modulator and AMMC demodulator. Usage of AMMC makes it possible to reduce the symbol error rate in communication channel up to 52 times. The satellite digital video broadcast systems that apply signal-code constructions based on AMMC are characterized by a higher energy efficiency from 1 to 2.6 dB compared with signal-code constructions based on 8PSK and APSK

Design of millimeter-wave six-port device for LTCC technology

In this paper a design of millimeter-wave six-port device for LTCC (Low Temperature Cofired Ceramic) technology is presented. Furthermore, problems with implementation of the project taking into account requirements of LTCC technology are discussed

Design of millimeter-wave six-port device for LTCC technology

In this paper a design of millimeter-wave six-port device for LTCC (Low Temperature Cofired Ceramic) technology is presented. Furthermore, problems with implementation of the project taking into account requirements of LTCC technology are discussed

Modernization of DVB-S2 Standard Using Signal-Code Constructions Based on Amplitude Modulation of Many Components

It is proposed to modernize the DVB-S2 standard by using AMMC (amplitude modulation of many components) signals instead of 8PSK (8-phase shift keying) and APSK (amplitude-phase shift keying) signals, and to modernize the DVB-S2 standard equipment by using the AMMC modulator and AMMC demodulator. Usage of AMMC makes it possible to reduce the symbol error rate in communication channel up to 52 times. The satellite digital video broadcast systems that apply signal-code constructions based on AMMC are characterized by a higher energy efficiency from 1 to 2.6 dB compared with signal-code constructions based on 8PSK and APSK

Study of D-band LTCC Leaky Wave Antenna Optimized for Broadside Radiation

This paper presents the design, fabrication and measurements of a Low Temperature Co-Fired Ceramic leaky wave antenna optimized for broadside radiation. The antenna consists of two DuPont 9k7 material layers. The thickness of each layer is approximately 115 um. The bottom layer plays the role of the main substrate and a top layer is used for creating a corrugated structure. The developed antenna operates in the frequency range of 125 GHz – 135 GHz with a minimized radiation pattern squint below 8 degrees in the whole operating bandwidth. The antenna reflection coefficient S11 is less than -10 dB in the operating frequency bandwidth and the maximum measured antenna gain is 9.9 dBi. Moreover a study of different antenna radiating structures and their capability of broadside radiation and reflection coefficient properties are discussed

Design of LTCC Based 3-D Antenna for Sub-THz Application

In the paper, selected aspects of LTCC technology for fabrication of passive elements for microwave application are presented. The research effect is based on the example of experimental 3-D antenna performed for a sub-THz scanner. For the described methods of antennas performance the achieved printing quality have been determined basing on observations using a digital microscope Hirox KH7700 and measurements of geometrical dimensions. The impact of geometrical structure dimensions and printed pattern resolution on its working abilities is also discussed. The main emphasis of the research work is on high resolution metallization obtainment by modification of screen printing parameters and conditions (the angle and pressure of squeegee, the mesh size), laser ablation and co-firing profile

New type of microstrip antenna with ferroelectric layer, Journal of Telecommunications and Information Technology, 2001, nr 4

A new type of microstrip antenna is proposed using a voltage-controlled ferroelectric thin tape in the multilayered structure. This paper presents the ferroelectric thin tape, its theoretical analysis and design. The results indicate that this concept has many advantages, is very practical and promising. It gives possibilities of several applications, e.g. in smart antennas

Phased array antennas in MIMO receiver, Journal of Telecommunications and Information Technology, 2007, nr 1

In this paper, a computer simulation of a MIMO system comprising phased array antennas (PAA) in all receiving branches is presented. In order to examine the system performance under relatively realistic conditions, a ray-tracing simulator was applied to generate a baseband channel impulse response matrix H. A bit error rate (BER) of two systems utilizing different detection methods: V-BLAST and simple matrix inversion was examined in order to determine phased array antennas applicability. Results of an attempt to determine relationship between BER and properties of particular matrix H realization are also provided

The Problems of Ultra Wide Band Antennas Design for High Resolution Radar Application

Abstract-The paper presents the analysis of properties of UWB antennas. It is stressed that conventional approach limited to impedance matching and radiation pattern analysis is often not sufficient in the case of UWB antennas. Distortions of transmitted UWB pulses can degrade performance of a system and thus phase characteristics of the transmission should be taken into consideration too. Having regard to those conditions two antennas are investigated in the paper: the conventional Vivaldi antenna and the designed shielded UWB monopole antenna

Millimeter-Wave Transmitter with LTCC Antenna and Silicon Lens

Millimeter-wave (mm-wave) transmitters are often fabricated using advanced technology and require a sophisticated manufacturing facility. Access to such technologies is often very limited and difficult to gain particularly at the initial stage of research. Therefore, to increase the accessibility of mm-wave transmitters, this study proposes a design that can be assembled in a standard microwave laboratory from commercially available or externally ordered components. The transmitter demonstrated in this paper operates above 100 GHz and is based on a low-temperature co-fired ceramic board in which the antenna array, microstrip lines, and power-supply lines are fabricated in a single process. Different technologies are used to assemble the module, e.g., wire-bonding, soldering, and wax adhesion. Advantages and disadvantages of the proposed design are given based on experimental evaluation of the prototype. Although the performance of the developed transmitter is not as good as that of the similar modules available in the recent literature, the results confirm the feasibility of a mm-wave transmitter that is assembled without employing advanced technologies and superior machinery