A Novel Beam-Switching Algorithm for Programmable Phased Array Antenna

Sanyal, Sugata; Alfred, Quazi Mohmmad; Chakravarty, Tapas

doi:10.2528/pier05122502

Cited by 30 publications

(23 citation statements)

References 4 publications

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“…The other alternative way is to combine only the amplitudes (power spectrum) and associate it with the phase values of any particular antenna taken as the reference antenna. The phase difference of different Fourier components might be calculated as shown in equation (14). Considering Ant-1 as the reference antenna ¶ , its phase values should now be associated with the signal received by antenna Ant-2, and then both these signals should be added as expressed in equation (15), where S total (f ) is the resultant spectrum.…”

Section: A Possible Methods For Combining Both Amplitude and Phase Spementioning

confidence: 99%

“…It is speculated that the uniform gain power spectrum antenna pattern theorem shall find major applications in the future designs of power spectrum monitoring stations, ultra wideband omnidirectional systems, receiving radio signals from artificial satellites or astronomical objects like the Sun or the Jupiter (radio spectrographs) etc. Presently the mechanically static antenna based phased array techniques for tracking radio sources are gaining popularity which involves complicated electronics [14], but the need for increasing bandwidth is on demand. Hence it is speculated that the present theorem might provide an alternative method to replace the dynamically tracking antenna systems by static ones in the near future.…”

Section: Remarks and Conclusionmentioning

confidence: 99%

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Uniform Gain Power-Spectrum Antenna-Pattern Theorem and Its Possible Applications

Joardar¹,

Bhattacharya²

2007

PIER

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Abstract-For certain applications in radio astronomy, viz. radio spectrographs, spectrum monitoring etc., only the amplitude power spectrum coverage within an angle of observation could be of interest. Ideally, the antenna structures of such instruments should illuminate this covering angle with a fixed uniform gain. This might be achieved using a combination of dipole antennas, a single vertical dipole, a loop antenna etc., but are subjected to limited bandwidth. This limitation could be overcome if many electrically-identical wideband antennas are positioned across the perimeter of a circle lying in the horizontal plane such that the antennas' adjacent half power beam angles touch each other. It has been theoretically observed that if two identical antennas are positioned at an angle with respect to one-another in such a way that their adjacent half power beam angles coincide, then if the amplitude power spectrums of the two are added, the result is effectively an amplitude power spectrum obtained from a single antenna having an uniform gain and uniform signal to noise ratio within the angle subtended by them. This angle also happens to be equal to the half power beamwidth of the individual antennas. A proper design using frequency independent antennas might possibly result to an user specified uniform amplitude power spectrum gain coverage across any required angle, with a theoretically unlimited bandwidth. More number of identical antennas might be positioned in similar fashion for extending the angular coverage. Joardar and BhattacharyaThe power spectrums from these antennas could be directly added which effectively represent the power spectrum from a single antenna possessing uniform gain coverage within an angle equal to the product of individual half power beamwidth angle with one less the number of antennas, thus achieving user defined gain, wide bandwidth, and uniform signal to noise ratio across the angle. It is also possible to recover the time domain signal by applying Fourier Transform on the outputs of the antennas followed by an addition of their amplitudes while keeping the phase information identical to that of one antenna (taken as reference), and taking its inverse Fourier Transform.

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Section: A Possible Methods For Combining Both Amplitude and Phase Spementioning

confidence: 99%

Section: Remarks and Conclusionmentioning

confidence: 99%

Uniform Gain Power-Spectrum Antenna-Pattern Theorem and Its Possible Applications

Joardar¹,

Bhattacharya²

2007

PIER

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“…A very popular type of antenna arrays is the circular array (CA) which has several advantages over other schemes such as all-azimuth scan capability (i.e., it can perform 360 • scan around its center) and the beam pattern can be kept invariant. CCAA that contains many concentric circular rings of different radii and number of elements have several advantages including the flexibility in array pattern synthesis and design both in narrowband and broadband beamforming applications [12][13][14][15][16][17][18][19]. CCAA is also favored in direction of arrival (DOA) applications since it provides almost invariant azimuth angle coverage.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mutual Coupling and Configuration of Concentric Circular Array Antenna on the Signal-to-Interference Performance in Cdma Systems

Fallahi¹,

Roshandel²

2007

PIER

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Abstract-The suitable use of an array antenna at the base station of a wireless communication system can result in improvement in signalto-interference ratio (SIR). In the present work, we consider circular array (CA) and concentric circular antenna array (CCAA) that are used for smart antenna systems. The performance criteria for SIR improvement is employed in this paper, is the spatial interference suppression coefficient. We first develop the expression of this figure of merit for CCAA and then analyze and compare the SIR performance for various configurations of eight and nine elements of CA and CCAA, with and without the element in the center by using circular patch antenna are provided. In addition, the effect of mutual coupling (MC) is taken into account.

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“…It also takes into consideration the increase in cell dimensions at lower elevation angles. The paper is arranged as follows; Section 2 discusses the use of both spot-beam antennas and phased antenna arrays [7,8] in the HAP radio coverage for cells formation and the geometry of the cell footprint. Section 3 reviews the terrestrial hexagonal cellular structure and its mathematical relations.…”

Section: Introductionmentioning

confidence: 99%

Design of High Altitude Platforms Cellular Communications

Dessouky¹,

Sharshar²,

Albagory³

2007

PIER

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Abstract-Cellular communications using high altitude platforms (HAPs) will predominate the existing conventional terrestrial or satellite systems but requires some optimization especially in the cellular radio coverage design. The design of HAPs cellular system suffers from increasing cell area when directing the same beam to cover lower elevation regions and therefore requires some modification in its location. In this paper either spot-beam antennas or antenna phased arrays are used in the radio coverage which are optimized in directing their beams to satisfy mostly uniform cellular layout with minimal coverage problems such as coverage gaps between cells or excessive cells overlap. The cells locations determination is done through proposed algorithm that takes into consideration the cell area increase at lower elevation angles and provides mostly uniform radio coverage especially at the cell edges.

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A Novel Beam-Switching Algorithm for Programmable Phased Array Antenna

Cited by 30 publications

References 4 publications

Uniform Gain Power-Spectrum Antenna-Pattern Theorem and Its Possible Applications

Uniform Gain Power-Spectrum Antenna-Pattern Theorem and Its Possible Applications

Effect of Mutual Coupling and Configuration of Concentric Circular Array Antenna on the Signal-to-Interference Performance in Cdma Systems

Design of High Altitude Platforms Cellular Communications

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