A 2-bit, 3.1 GS/s, band-pass DSM receiver for active antenna systems

CMOS Bit-Stream Band-Pass Beamforming

We introduce a unique bandpass ΣΔ based common module with reconfigurable, bit-stream based digital beam-forming (DBF). An array of bandpass ΣΔ modulators accurately and efficiently digitizes the IF signals. Beam-forming is implemented directly through bitsteam processing of the fast, low-resolution bit-stream outputs of the quantizers of each bandpass ΣΔ modulator. Fabricated in 65nm CMOS, the...

Design, Simulation and implementation of active dual-band dipole antenna using a series stub

In this paper, a new method for designing an active dual-band dipole antenna is proposed. The operating frequencies of the proposed antenna are 150 and 450 MHz that are usually used in military applications. Using a series stub is the main idea in the proposed dual-band antenna, where it makes an independent resonance frequency higher than the main resonance frequency of a conventional dipole. ...

Receiver Band-Pass Filters Having Maximum Attenuation in Adjacent Bands

A low complexity antenna diversity receiver for OFDM based systems

A low complexity antenna diversity architecture with a new combining technique suitable for Orthogonal Frequency Division (OFDM) based systems is introduced in this paper. For a two branch antenna diversity, this structure requires only one FFT at the receiver and allows optimum maximum ratio combining. For systems with a higher number of antennas, the number of required FFTs when using such te...

Typical Ka band Satellite Beacon Receiver Design for Propagation Experimentation

This paper presents the design and simulation of a typical Ka band satellite beacon receiver for propagation experimentation. Using satellite beacon signal as a reference signal in satellite wave propagation study, is one of the most important methods. Satellite beacons are frequently available for pointing large antennas, but such signals can be used for measuring the effect of natural phenome...