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This paper deals with the design of a Ku-band phased array antenna where phase shifting is performed through the use of reflection-type phase shifters controlled with varactor diodes. The paper describes a new calibration method which can provide the bias voltage to be applied to each phase shifter in order to scan the beam in the desired direction. This method is based on the use of a microstrip...
A fully-monolithic 3-element array of coupled voltage-controlled-oscillator (VCO) network was fabricated in a 0.18μm SiGe BiCMOS process for potential use in a Rx/Tx modules. A digitally controlled on-chip passive network was designed and used for controlling the coupling strength across the array VCO units. The operational bandwidth of this core network resides in the S-Band from 1.2GHz to 1.7GHz...
A fully monolithic 1-Dimensional (1-D) AC-coupled Voltage-Controlled-Oscillators (VCOs) network design for phased-array applications will be presented in this paper. This radio-frequency (RF) VCO array integrates on-chip inductors, varactors, and bias current sources and it contains an odd number of VCOs (i.e., 3 or 5, etc.) AC-coupled through on-chip switchable resistor networks with MOSFETs. Realistic...
This paper demonstrates a concept for transmitting on one set of elements of a phased array while concurrently receiving on another set at a separate frequency. Cases are analyzed using measured data from an 8×8 microstrip stacked patch panel array operating at 33.8GHz, and relative coupling levels from interfering elements to receive elements are characterized over various scan angles for two array...
In this paper near field focusing by a finite wire array composed of resonant wire elements executing time reversal is studied for the first time for the case of non-monochromatic sinusoidal pulse excitation. It has been shown that subwavelength focusing with characteristic resolution ~ lambdar/4 at the distance ~ lambdar/5 from the array is achievable with a very short array. We show that the resolution...
An integrated circuit design and analysis of a fully monolithic 1-Dimensional (1-D) AC-coupled voltage-controlled-oscillators (VCOs) network for potential applications on phase array antennas is presented. This fully monolithic RF VCO array integrates inductors with on-chip bias current sources and contains an odd number of VCOs AC-coupled through switchable resistor arrays. Our design can control...
This paper presents the effects of mutual coupling between the elements of an array, Mutual coupling between antenna elements can distort array pattern and increase reflected power to antenna feed system, To examine these effects in microstrip antenna arrays with 3times4 Butler matrix, prototypes of multilayer slot coupled and the Butler matrix were simulated. Furthermore, a four-antenna array was...
The results presented here suggest that there is a correlation between receive coupling and terminal current behavior in a phased array. Therefore, receive coupling can be used to design antenna elements, which will exhibit reduced mutual coupling effects when operated in a phased array. Since only two antenna elements are involved, this is much less computationally intensive than the calculation...
A Pareto GA approach has been used to optimize broadband dipole antennas for use in the LWA in terms of mutual coupling performance, sky noise frequency response, and radiation pattern quality. A simple receive coupling calculation between two antennas was used in the GA to estimate mutual coupling effects in a phased array. It was found that performance trade-offs must be made between sky noise response...
This paper presents a 22-24 GHz CMOS 4-element phased array based on the all-RF architecture with very low power consumption and chip area. The measured array performance, done at the system level at 22-24 GHz, shows an input and output match of <-13 dB, 9-12 dB gain, 7.5-8.0 dB NF, an IIP3 of -9.5 to -12.5 dBm, and a 4-bit phase control with an rms gain and phase error of <1.2 dB and <6deg,...
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