對於家庭娛樂網路，同軸纜線多媒體聯盟協定已經是一個業界通用的標準，尤其是在北美地區，同軸纜線多媒體聯盟(Multimedia over Coax Alliance，MoCA) 應用在數位機上盒與纜線數據機上非常普遍。本論文以數位機上盒與纜線數據機系統製造商的表面黏著製程 (Surface Mount Technology )常用的電感與電容元件實現低成本但高性能的多工器模組，改善傳統可調式空心線圈生產不易與二次迴焊時感值偏移情形，表面黏著製程可達到機板底層無貫穿孔，強化射頻模組抗拒無線干擾能力。 本模組多功器包含了四組濾波器: (1).同軸纜線多媒體傳輸標準帶通濾波器提供同軸纜線多媒體傳輸標準訊號路徑。(2).同軸纜線多媒體傳輸標準拒斥低通濾波器供給數位機上盒或纜線數據機非同軸纜線多媒體傳輸標準訊號路徑下載或上傳使用。(3).下載頻段的高通濾波器。(4).上傳頻段的低通濾波器。各濾波器特性如下: (1).同軸纜線多媒體傳輸標準帶通濾波器: 插入損失2.8 dB，返回損失6.3 dB，同軸纜線多媒體傳輸標準諧波帶衰減大於40 dB。(2).下載頻段的高通濾波器與同軸纜線多媒體傳輸標準帶拒濾波器:插入損失2.8 dB，返回損失10.9 dB，同軸纜線多媒體傳輸標準頻段與諧波衰減大於50 dB。(3).上傳頻段的低通濾波器:插入損失0.94 dB，返回損失10.6 dB，上傳諧波衰減大於54 MHz~88 MHz大於50 dB，88 MHz~126 MHz大於70 dB。For the home entertainment network，the Multimedia over Coax Alliance (MoCA) is the universal standard. The MoCA application on STB and Cable Modem is very popular especially in North American. The study is to design a low cost and high performance triplexer module with commercial SMD lump inductors and capacitors components for STB/Cable Modem OEM or ODM vender. It improves the traditional adjustable air wire wound inductors is hard to mass production and 2nd reflow issue. The SMD process without DIP (Dual In-Line Package) components make no through hole on PCB . It improves the RS immunity performance. This triplexer design including 4 filters : (1) MoCA bandpass filter for MoCA Path. (2) MoCA reject lowpass filter for normal Cable downstream and upstream application. (3)Downstream highpass filter for downstream path. (4) Upstream lowpass filter for upstream path. The triplexer measurement result is as below: (1) MoCA BPF: Insertion loss 2.8 dB and return loss 6.3 dB. The attenuation of MoCA harmonic is higher than 40dB. (2)Downstream HPF and MoCA Reject LPF: Insertion loss is 2.8 dB , return loss is 10.9 dB and the attenuation of MoCA band harmonic is higher than 50 dB. (3).Upstream LPF: Insertion loss 0.94 dB , return loss 10.6 dB , the attenuation between 54 MHz~88 MHz is higher than 50 dB and between 88 MHz~126 MHz is higher than 70 dB.
