求救, 各位RFID的大侠

   Normal  0        0  2    false  false  false    EN-US  ZH-TW  X-NONE                                                            MicrosoftInternetExplorer4                                                                                                                                                                                                                                                                                                                         <!-- /* Font Definitions */ @font-face    {font-family:SimSun;    panose-1:2 1 6 0 3 1 1 1 1 1;    mso-font-alt:宋体;    mso-font-charset:134;    mso-generic-font-family:auto;    mso-font-pitch:variable;    mso-font-signature:3 135135232 16 0 262145 0;}@font-face    {font-family:新細明體;    panose-1:2 2 3 0 0 0 0 0 0 0;    mso-font-alt:PMingLiU;    mso-font-charset:136;    mso-generic-font-family:roman;    mso-font-pitch:variable;    mso-font-signature:3 135135232 22 0 1048577 0;}@font-face    {font-family:"Cambria Math";    panose-1:2 4 5 3 5 4 6 3 2 4;    mso-font-charset:1;    mso-generic-font-family:roman;    mso-font-format:other;    mso-font-pitch:variable;    mso-font-signature:0 0 0 0 0 0;}@font-face    {font-family:Calibri;    panose-1:2 15 5 2 2 2 4 3 2 4;    mso-font-charset:0;    mso-generic-font-family:swiss;    mso-font-pitch:variable;    mso-font-signature:-1610611985 1073750139 0 0 159 0;}@font-face    {font-family:"\@SimSun";    panose-1:2 1 6 0 3 1 1 1 1 1;    mso-font-charset:134;    mso-generic-font-family:auto;    mso-font-pitch:variable;    mso-font-signature:3 135135232 16 0 262145 0;}@font-face    {font-family:"\@新細明體";    panose-1:2 2 3 0 0 0 0 0 0 0;    mso-font-charset:136;    mso-generic-font-family:roman;    mso-font-pitch:variable;    mso-font-signature:3 135135232 22 0 1048577 0;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal    {mso-style-unhide:no;    mso-style-qformat:yes;    mso-style-parent:"";    margin:0cm;    margin-bottom:.0001pt;    mso-pagination:none;    font-size:12.0pt;    mso-bidi-font-size:11.0pt;    font-family:"Calibri","sans-serif";    mso-ascii-font-family:Calibri;    mso-ascii-theme-font:minor-latin;    mso-fareast-font-family:新細明體;    mso-fareast-theme-font:minor-fareast;    mso-hansi-font-family:Calibri;    mso-hansi-theme-font:minor-latin;    mso-bidi-font-family:"Times New Roman";    mso-bidi-theme-font:minor-bidi;    mso-font-kerning:1.0pt;}.MsoChpDefault    {mso-style-type:export-only;    mso-default-props:yes;    mso-bidi-font-family:"Times New Roman";    mso-bidi-theme-font:minor-bidi;} /* Page Definitions */ @page    {mso-page-border-surround-header:no;    mso-page-border-surround-footer:no;}@page Section1    {size:612.0pt 792.0pt;    margin:72.0pt 90.0pt 72.0pt 90.0pt;    mso-header-margin:36.0pt;    mso-footer-margin:36.0pt;    mso-paper-source:0;}div.Section1    {page:Section1;}--> /* Style Definitions */ table.MsoNormalTable    {mso-style-name:表格內文;    mso-tstyle-rowband-size:0;    mso-tstyle-colband-size:0;    mso-style-noshow:yes;    mso-style-priority:99;    mso-style-qformat:yes;    mso-style-parent:"";    mso-padding-alt:0cm 5.4pt 0cm 5.4pt;    mso-para-margin:0cm;    mso-para-margin-bottom:.0001pt;    mso-pagination:widow-orphan;    font-size:12.0pt;    mso-bidi-font-size:11.0pt;    font-family:"Calibri","sans-serif";    mso-ascii-font-family:Calibri;    mso-ascii-theme-font:minor-latin;    mso-hansi-font-family:Calibri;    mso-hansi-theme-font:minor-latin;    mso-font-kerning:1.0pt;}当读写器只用一个天线时, &,_?>.\[<  
会有大概15dBm的反射 .. /H.(d 4C  
o9~h%&  

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当读写器只用一个天线时, U:s}/to  
会有大概15dBm的反射入receiver, va`l*N5  
然而标签(TAG)反射回receiver的信号(-50dBm) |V5$'/Y  
却比天线反射的低, r7
8u=r  
如此receiver便无法读到标签的信号, \O8Y3|<  
请问怎么让receiver读到标签的信号而不是天线反射???