# US 12,191,580 B2 · Lowband dipole with improved gain and isolation

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- Number: US 12,191,580 B2
- Document ID: US12191580B2
- Status: Granted
- Kind: B2
- Application number: 18/101,332
- Filed: 2023-01-25
- Published: 2023-09-21
- Granted: 2025-01-07
- Earliest claimed: 2022-01-26
- Assignees: John Mezzalingua Associates, Inc.
- Applicants: John Mezzalingua Associates, LLC
- Inventors: Niranjan Sundararajan; Wengang Chen; Jiaqiang Zhu
- Web page: https://patentgrep.com/patent/US12191580B2

## CPC

- H01Q 5/42: using two or more imbricated arrays (H01Q5/49 takes precedence)
- H01Q 1/246: {specially adapted for base stations}
- H01Q 1/521: {reducing the coupling between adjacent antennas}
- H01Q 21/26: Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

A lowband radiator has four dipole arms and a central region that is centered at the intersection of the dipole arms. Each of the dipole arms has a sequence of capacitive and inductive structures and a pair of high gain wings that are disposed in the dipole central region. In one embodiment of the lowband radiator, each dipole arm has a gap within the central region that is colinear with the dipole arm. The dipoles provide for improved isolation from nearby midband radiators while providing high gain.

## Claims

### Claim 1

A dipole for a multiband antenna, comprising:
four dipole arms arranged in a cross pattern, wherein the four dipole arms are arranged in a first pair of dipole arms and a second pair of dipole arms, the first pair of dipole arms are colinear and configured to radiate a first RF (Radio Frequency) signal at a first polarization angle and the second pair of dipole arms are colinear and configured to radiate a second RF signal at a second polarization angle, wherein the first polarization angle is perpendicular to the second polarization angle; and
a central region, wherein the central region is centered at an intersection of the first pair of dipole arms and the second pair of dipole arms,
wherein each of the dipole arms comprises a sequence of capacitive structures and inductive structures and a pair of high gain wings, wherein the pair of high gain wings are disposed in the central region.

### Claim 2 (depends on 1)

The dipole of claim 1, wherein the dipole comprises:
a PCB (Printed Circuit Board) substrate; and
a patterned conductive layer disposed on the PCB substrate, wherein each of the dipole arms are formed of the patterned conductive layer.

### Claim 3 (depends on 1)

The dipole of claim 1, wherein the sequence of capacitive structures and inductive structures comprises an alternating sequence.

### Claim 4 (depends on 1)

The dipole of claim 1, wherein each of the inductive structures comprises a high impedance line.

### Claim 5 (depends on 1)

The dipole of claim 1, wherein each of the high gain wings is disposed proximate to a perimeter of the central region.

### Claim 6 (depends on 5)

The dipole of claim 5, wherein each of the four dipole arms comprises a gap that is disposed in the central region, wherein the gap substantially occupies a region colinear with the dipole arm.

### Claim 7 (depends on 6)

The dipole of claim 6, wherein each high gain wing comprises an inductive choke disposed at a high gain wing corner.

### Claim 8

A multiband antenna, comprising:
a plurality of midband dipoles arranged in a plurality of unit cells, wherein the plurality of unit cells are arranged in columns; and
a plurality of lowband dipoles, wherein each of the plurality of lowband dipoles is disposed within a corresponding unit cell, wherein each of the lowband dipoles has four dipole arms arranged in a cross pattern, wherein the four dipole arms are arranged in a first pair of dipole arms and a second pair of dipole arms, the first pair of dipole arms are colinear and configured to radiate a first RF (Radio Frequency) signal at a first polarization angle and the second pair of dipole arms are colinear and configured to radiate a second RF signal at a second polarization angle, wherein the first polarization angle is perpendicular to the second polarization angle, wherein each of the lowband radiators has a central region, wherein the central region is centered at an intersection of the first pair of dipole arms and the second pair of dipole arms, wherein each of the dipole arms comprises a sequence of capacitive structures and inductive structures and a pair of high gain wings, wherein the pair of high gain wings are disposed in the central region, wherein each of the dipole arms has an outer arm that overlaps a corresponding midband dipole.

### Claim 9 (depends on 8)

The multiband antenna of claim 8, wherein each of the unit cells comprises a midband dipole spacing that corresponds to an azimuth beamwidth.

### Claim 10 (depends on 9)

The multiband antenna of claim 9, wherein the multiband dipole spacing is substantially 90 mm and the azimuth beamwidth is substantially 45 degrees.

### Claim 11 (depends on 9)

The multiband antenna of claim 9, wherein the multiband dipole spacing is substantially 114 mm, and the azimuth beamwidth is substantially 65 degrees.

### Claim 12 (depends on 8)

The multiband antenna of claim 8, wherein each of the four dipole arms comprises a gap that is disposed in the central region, wherein the gap substantially occupies a region colinear with the dipole arm.