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Method and apparatus for antenna radiation cross polar suppression

A cross-coupling, antenna array technology, applied in the field of cellular communication, can solve problems such as XPD difficult optimization practice

Inactive Publication Date: 2014-02-05
QUINTEL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Thus, for base station antennas, good XPD may prove a difficult optimization practice when designing antennas for wide bandwidth, multiband operation with VET

Method used

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  • Method and apparatus for antenna radiation cross polar suppression
  • Method and apparatus for antenna radiation cross polar suppression
  • Method and apparatus for antenna radiation cross polar suppression

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Example 1: Cross-coupling imposed between base station and antenna:

[0037] image 3 A cellular radio base station comprising a baseband processing section (200) and an RF processing section (300) is illustrated with two antenna RF ports (401A, 401B). image 3 Also illustrated is an antenna array 500 with antenna connection ports (501A, 501B) of the X-polarized antenna array. In one embodiment, as in image 3 Schematically shown in , after the base station modules (eg, the baseband processing section 200 of the base station and the RF processing section 300 of the base station) and before connecting to the X-polarized antenna (500) in the base station configuration is applied as above in figure 1 The cross-coupling function or module (100) shown in, therefore, the cross-coupling network is tuned / designed to maximize XPD over a predetermined or most significant range of azimuth, electrical inclination and frequency. It should be noted that the base station modules or...

Embodiment 2

[0039] Example 2: Cross-coupling imposed between power amplifier and duplex;

[0040] In another embodiment, as in Figure 4 As schematically shown in , after the power amplifiers (360A, 360B) but before any Tx / Rx duplex stages (370A, 370B) within the base station RF section (300) are applied as above in figure 1The cross-coupling network (100) shown in . In this embodiment, independent Tx and Rx path cross-coupling networks can be implemented. Transmit and receive RF channels in a frequency division duplex (FDD) base station system are commonly Tx / Rx duplexed (370A, 370B) within the base station RF section (300), where the Tx and Rx channels can be frequency-duplexed. are significantly separated and will result in different antenna XPD characteristics for Tx and Rx frequencies. This embodiment allows independent cross-coupling networks and tuning for the Tx and Rx paths. For clarity, Figure 4 Only the cross-coupling network applied in the Tx path is shown. However, a s...

Embodiment 3

[0041] Example 3: Cross-coupling imposed between base station and antenna using directional coupling devices:

[0042] as in Figure 5 Yet another embodiment, schematically shown in , uses a cross-coupling network (100A) with directional power coupling devices (111A, 112A, 111B, 112B) to perform the power splitting and recombining functions of the cross-coupling network. This cross-coupling network (100A) is figure 1 An alternative embodiment of the cross-coupling network (100). Transmit and receive RF channels in frequency division duplex (FDD) base station systems are commonly Tx / Rx duplexed within the base station, where the Tx and Rx channels can be significantly separated in frequency and will result in Different antenna XPD characteristics for Rx frequencies. This embodiment allows independent cross-coupling networks and tuning for the Tx and Rx paths. In other words, two cross-coupling networks can be applied, wherein both cross-coupling networks share the same spli...

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Abstract

Cross-polar discrimination (XPD) of a dual orthogonal cross-polarised antenna is maximized via a cross-coupling network between base station MIMO branches prior to connection to the base station antenna. In one embodiment, a cross coupling network combines each MIMO branch signal with an attenuated phase reversed (phase shifted) copy of the other MIMO branch signal. The amount of attenuation for each branch is equivalent to the cross polar suppression required for each antenna array. The cross-coupling can be applied at different stages of signal processing within a base station.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims the benefit of US Provisional Patent Application Serial No. 61 / 467,915, filed March 25, 2011, which is incorporated herein by reference in its entirety. [0003] The present disclosure relates generally to the field of cellular communications, and more particularly to maximizing cross polar discrimination of dual orthogonal cross-polarized antennas. Background technique [0004] The cross-polarization discrimination (XPD) of an antenna element or antenna array is a measure of the ability of an array to radiate in its intended polarization without entering its orthogonal (or cross) polarization. The radiated power into the orthogonal polarization (and thus the degradation of XPD performance) can be caused by a number of factors, including radiation from the common feed network, radiation from the element / common feed junction / balun network The fact that radiation, X or cross shapes are used for dual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/26
CPCH04B7/002H04B7/10H04B7/0469H04B7/0413H01Q1/246
Inventor D.E.巴克D.S.皮亚扎S.T.纽博尔德
Owner QUINTEL TECH
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