Ku頻帶8/16GHz倍頻器與Ku頻帶昇頻器

Abstract

論文分為兩部份: 一為將頻率從8GHz倍到16GHz的Ku頻帶二倍頻器，可供 耦合式振盪器天線陣列使用，以增加其掃瞄角度；另一為可移動式衛星通 訊用昇頻器，提供輸出功率大於0dB，頻率為14.1-14.6GHz的射頻訊號。 從8GHz倍到16GHz之Ku頻帶二倍頻器採用高移動載子電晶體為主動元件， 偏壓在B類工作區在輸入為8.4GHz時，其有最大的轉換增益4.17 dB；而0 dB 轉換增益的頻寬為7.9-8.7 GHz。載波對雜訊比約為6dB，接近理想狀 況。基波與第三次諧波抑制分別達到33dBc與35dBc以上。此電路大小 為30*40 (mm2)Ku頻帶衛星通訊用昇頻器包括了兩個模組，一為單端電阻 性混頻器另一為丁懿芬製作的頻率合成器。在本地振盪源為13.2GHz輸入 下，此昇頻器將0.9-1.4GHz的中頻訊號上變頻至14.1-14.6GHz的射頻訊號 ，其轉換損失小於9.6 dB。中頻訊號輸入大於7dBm，此昇頻器提供輸出功 率大於0dBm的射頻訊號。本地振盪訊號與2IF+LO抑制分別達到20dBc與25 dBc以上。 In this report, we present a frequency doubler which doubles frequency from8 GHz to 16 GHz for the phase shift array application and a Ku-Band up-converter for mobile satellite communications. Both of them are fabricated by hybrid-MIC technique. The active device of the frequency doubler is a high electron mobility transistor (HEMT) biased at class B. It doubles frequency from 8 GHz to 16 GHz.and has maximum conversion gain 4.17 dB at input 8.4 GHz; 0 dB conversion gain bandwidth is 750 MHz from 7.96-8.64GHz and Carrier to noise ratio (CNR) is 6dB. The rejection of fundamental and 3rd harmonic are greater than 33dBc and 35 dBc,respectively. The area occupied by the doubler is 30mm*40mm.The Ku-Band up- converter includes two modules. One is the signal-ended resistive mixer. The other is the Ku-Band frequency synthesizer developed by Ting. The up-converter converts IF (0.9 GHz~1.4 GHz) to RF (14.1 GHz~14.6 GHz) with LO 13.2GHz. The maximum conversion loss is 9.6dB. The RF output power is greater than 0 dBm when IF input power greater than 7 dBm. It also achieved LO rejection>20 dBc and 2IF+LO rejection>22.5 dBc. The phase-locked frequency has a bandwidth from 13.160 GHz to 13.208 GHz.