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Scanable sparse antenna array

A sparse array and antenna array technology, applied in the field of scanning, can solve problems such as distance reduction

Active Publication Date: 2006-12-13
OPTIS CELLULAR TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Thus, the problem with designing antennas is that the radiating elements in an array antenna have to be spaced less than a wavelength apart to prevent unwanted grid (secondary) lobes, and in the case of scanned beams the spacing is further reduced

Method used

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Examples

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Embodiment Construction

[0029] In order to explain the principles of the present invention, 2(R X )+2(T X ) waveguide test model. Then, the goal is to demonstrate the performance of interleaved antennas and the corresponding simulation effects. The design of this experimental model will be described.

[0030] The center frequency of the test model is selected as:

[0031] f RX =5.671GHz

[0032] f TX =5.538GHz

[0033] The slot length and slot displacement are calculated using an analysis program for waveguide slot slot antennas. The slot length and displacement are set to be equal for all slots in each frequency bin function.

[0034] The slot parameters were varied and analyzed until they matched the input impedance of each waveguide. The two unexcited waveguides are also calculated.

[0035] The final design parameters are shown below:

[0036] f RX =5.671GHz (center frequency)

[0037] f TX =5.538GHz

[0038] lambda g_RX =82.84mm (waveguide wavelength)

[0039] lambda g_TX =87.99m...

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Abstract

A sparse array antenna is disclosed. The antenna comprises series-fed antenna array columns tuned to a respective transmit and receive frequency. The transmitting and receiving radiation elements are formed with a given distance between each transmitting radiator element and each receiving radiator element, and the series-fed antenna columns are arranged in parallel, perpendicular to a symmetry line forming a symmetric interleaved transmit / receive array. Furthermore the receiving array columns operate as parasitic elements in a transmit mode and transmitting array columns operate as a parasitic elements in a receive mode, thereby reducing creation of grating lobes. The created sparse array antenna may further be arranged to be scanable to also provide reduced sidelobes entering visual space when scanning the main radiation lobe from an off boresight direction. Typically the series-fed array columns may be formed as extended ridged slotted wave-guides tuned to a respective transmitting or receiving frequency.

Description

technical field [0001] The present invention relates to an antenna array with a sparse antenna design and also provides a scan with reduced grid lobes. Background technique [0002] The increasing demand for capacity of area-coverage communication networks can be addressed by introducing array antennas. These antennas are arrays of radiating elements that create one or more narrow beams in an azimuthal plane. The narrow beams are directed or selected towards the customer of interest, thereby reducing interference in the network and thereby increasing capacity. An interleaved single aperture synchronous Rx / Tx antenna is disclosed in US Patent No. 6,509,881. [0003] With the help of Butler matrices connected to the antenna columns, many simultaneous fixed scanning beams can be generated in the azimuth plane. Since the generation of interference lobes (also called grid lobes) due to the constructive increase in phase repetition must be taken into account, the spacing of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q21/00
CPCH01Q21/005H01Q1/523H01Q1/525H01Q3/30H01Q13/22
Inventor B·斯文松K·法尔克U·恩斯特伦
Owner OPTIS CELLULAR TECH LLC
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