# US 12,119,557 B2 · Grating lobe cancellation

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- Number: US 12,119,557 B2
- Document ID: US12119557B2
- Status: Granted
- Kind: B2
- Application number: 18/366,856
- Filed: 2023-08-08
- Published: 2024-02-22
- Granted: 2024-10-15
- Earliest claimed: 2022-07-20
- Applicants: Naval Information Warfare Center Pacific
- Inventors: Jia-Chi Samuel Chieh
- Web page: https://patentgrep.com/patent/US12119557B2

## CPC

- H01Q 3/26: varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture ({H01Q3/12,} H01Q3/22, H01Q3/24 take precedence)
- H01Q 21/293: {one unit or more being an array of identical aerial elements (adaptive arrays H01Q3/2605)}
- H01P 5/16: Conjugate devices, i.e. devices having at least one port decoupled from one other port
- H01Q 9/0478: {with means for suppressing spurious modes, e.g. cross polarisation}
- H01Q 21/08: the units being spaced along or adjacent to a rectilinear path {(waveguide fed H01Q21/0037)}
- H01Q 21/10: Collinear arrangements of substantially straight elongated conductive units
- H01Q 25/04: Multimode antennas {(corrugated horns H01Q13/0208)}
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)

## 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.

## Claims

### Claim 1

A method of radiating a tapered slot antenna, comprising,
radiating the tapered slot antenna using a dual pattern, wherein the antenna has an inter-element spacing of about 1λ and the dual mode includes a differential mode and a common mode;
radiating the differential mode to generate a far field summation pattern, wherein the differential mode has a broadside pattern characterized with a beam peak at broadside, wherein the differential mode produces grating lobes in addition to the beam peak at broadside; and
radiating the common mode to generate a far field differential pattern orthogonal to the far field summation pattern, thereby causing the common mode to produce a null at broadside to suppress the grating lobes produced by the differential mode, wherein the grating lobes are suppressed by:
i) applying an identical amplitude and phase to the differential mode and common mode;
ii) adjusting a phase shift until the null appears;
iii) adjusting the common 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.

### Claim 2 (depends on 1)

The method of claim 1, further including splitting an RF signal between 1 or more radio-frequency integrated circuits using a Wilkinson power divider.

### Claim 3 (depends on 2)

The method of claim 2, wherein the Wilkinson power divider includes a split between 1 to 48 radio-frequency integrated circuits.

### Claim 4 (depends on 1)

The method of claim 1, wherein the grating lobes are cancelled in an amount of equal to or less than 30 dB.