Grating lobe cancellation
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorJia-Chi Samuel Chieh
Life of this patent
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Abstract
A method for radiating a co-located antenna including radiating the co-located antenna using a dual mode, where the co-located antenna has an inter-element spacing of about 1λ and the dual mode includes a TM11 mode and a TM21 mode. The TM11 mode is radiated to generate a TM11 far field pattern, where the TM11 mode has a broadside pattern characterized with a beam peak at broadside and the TM11 mode produces grating lobes in addition to the beam peak at broadside. The TM21 mode is radiated to generate a TM21 far field pattern orthogonal to the TM11 far field pattern, thereby causing the TM21 mode to produce a null at broadside to suppress the grating lobes produced by the TM11 mode.
Claims8
An antenna system, comprising:
- a multi-mode antenna having a plurality of radiating elements, wherein the radiating elements have an inter-element spacing of 12 and can radiate in a dominant mode and an auxiliary mode where 2 is a wavelength of an operating frequency band of the multi-mode antenna;
- a beamformer, wherein the beamformer is integrated with a multi-chip module;
- an indium phosphate (InP) low noise amplifier;
- a gallium nitride (GaN) high power amplifier;
- and
- wherein the multi-mode antenna suppresses grating lobes by:
- i) applying an identical amplitude and phase to the dominant mode and auxiliary mode;
- ii) adjusting a phase shift until the null appears;
- iii) adjusting the auxiliary mode amplitude by using a 0.5 dB attenuation;
- and
- iv) repeating ii) and iii) until equal to or less than 30 dB of cancellation been achieved.
An antenna system, comprising:
- a multi-mode antenna having a plurality of radiating elements, wherein the radiating elements have an inter-element spacing of 12 and can radiate in a dominant mode and an auxiliary mode where 2 is a wavelength of an operating frequency band of the multi-mode antenna;
- a beamformer, wherein the beamformer is integrated with a multi-chip module;
- a gallium nitride (GaN) high power amplifier;
- and
- wherein the multi-mode antenna suppresses grating lobes by:
- i) applying an identical amplitude and phase to the dominant mode and auxiliary mode;
- ii) adjusting a phase shift until the null appears;
- iii) adjusting the auxiliary mode amplitude by using a 0.5 dB attenuation;
- and
- iv) repeating ii) and iii) until equal to or less than 30 dB of cancellation been achieved.
Dependencies are inferred from the claim text.