Number Of Phase Shifters Research Articles

An X-band experimental model of a millimeter-wave interinjection-locked phased array system

An interinjection-locked 10 GHz model of a millimeter-wave phased-array system has been built and tested. It has been successfully demonstrated that this novel technique can be used to control limited-scan phased-array antennas. A beam shift of +or-5 degrees has been achieved with only one phase shifter in a four-oscillator system. Adaptability to monolithic fabrication and a reduction in the number of phase shifters required make this method attractive for use at millimeter-wave frequencies. >

Multiple-beam sampler for continuously scanned array antennas

A multiple-beam sampler is described for continuously scanned array antennas using frequency modulation or time modulation for the scanning process. It is shown that for the special case of a linear array antenna with a number of receiving elements equal to an integer power of two, the multiple-beam sampler can be implemented using a minimum number of phase shifters and adders. The scheme makes use of the similarity of the expressions defining the discretized version of the beam sampling signal and the discrete Fourier transform. Extension of the multiple-beam sampler to planar array antennas is also considered.

Interpolation locking: a new technique for active array antennas

The paper describes theory and experiments on a new technique for reducing the number of phase shifters in active transmitting antenna arrays. Alternate elements in the array have no phase shifters and are locked to the mean phase of their neighbour elements by a signal mutually coupled from the radiating apertures. The technique allows both the number of phase shifters and the required locking power to be reduced by half in an active linear array. The beam steering angle is limited to about ± 30°, but steering angles up to greater than half this value may be obtained with very similar sidelobe levels to those for an array with phase shifters in each element. Very good agreement is obtained between a theory, taking into account the oscillator locking characteristics, and experiments on a 7-element X-band array of waveguide elements with impatt oscillators.

Efficient implementation of multiple-beam sampler for continuously scanned array antennas

A multiple-beam sampler is described for continuously scanned array antennas using time modulation or frequency modulation. It is shown that, for the special case of an array antenna with a number of elements equal to an integer power of two, the multiple-beam sampler can be implemented using a minimum number of phase shifters and adders.

Phase-interpolation locking: new technique for beam-steered active antennas

A new method of phase control for beam steering an active antenna array is suggested. Only half the normal number of phase shifters are needed, but there is a limit to he angle throught whih the beam ca be steered by this technique.