傳統雙工器使用T行分波器與兩個共振器，因為要同時匹配兩個通帶，使得設計上較為困難，因此本論文使用一種電路架構，採用基板合成波導(Substrate Integrated Waveguide)製作n階濾波器由k個雙模共振器(TE101與TE201)與(n-k)對單模共振器(TE101)構成，利用雙模共振器取代T型分波器與兩個共振器，大幅縮小了電路面積與損耗，整體電路大約為26.7 mm*19.2 mm，還可以調整共振器的數量來改變隔離度。一般雙模共振器在控制兩通帶的比例頻寬有許多限制，因此在電路的輸入端增加一個偏移的饋入端口，得以增加設計的靈活度，並且將其圖表化，未來可以從圖表根據所需要的比例頻寬找尋對應的變數。 本文設計三階濾波器(k=1，n=3)操作在12GHz與14GHz來驗證此設計是可行的，並且再製作一個三階濾波器(k=2，n=3)與上述電路相同規格，比較兩電路的隔離度，以此證明因隔離通道縮短使得隔離度下降。 最後對量測結果與模擬結果做比較，探討兩結果的差異，並且將電路重新模擬，分析損耗來源與製程誤差對電路的影響。 ;The traditional duplexer uses a T- junction and two resonators. It is challenging to design two passbands at the same time, so make use of a circuit architecture in this paper. Using Substrate Integrated Waveguide to make n pair of The first-order filter is composed of k dual-mode resonators (TE101 and TE201) and (n-k) single-mode resonators (TE101). The dual-mode resonator is used to replace the T- junction and two resonators, which greatly reduces the circuit. In terms of area and loss, the overall circuit is about 26.7 mm*19.2 mm, and the number of resonators can be adjusted to change the isolation. Generally, there are many limitations of the dual-mode resonator in controlling the proportional bandwidth of the two passbands. Therefore, adding an offset to the input port of the circuit can increase the flexibility of the design. Base on the collecting offset variable data, we could make a data table that helps searching needed variables in the future. In this paper, we designed a pair of third-order filters (1st k=1, n=3; 2ed k = 2, n =3) with identical specifications and both were used under 12 GHz and 14 GHz as comparison to verify that the design was feasible. Comparing the isolation degree of these two designs so as to prove that the isolation degree was decreased due to the shortening of the isolation channel. Finally, compare the measurement results with the simulation results, discuss the difference between the two results, and analyze the influence of losses and process errors on the circuit.
