A microstrip mixer,tadapted for receiving a local oscillator signal and a feedback signal and outputting an intermediate-frequency signal corresponding to the frequency difference between the local oscillator signal and the feedback signal,comprising:two mixer tubes, wherein an end of both said mixer tubes are grounded; and a microstrip mixing line, comprising a first microstrip arm and a second microstrip arm integrally extended from said first microstrip arm and having a shared port, a mixing output port, and a localoscillator signal input port, wherein said local oscillator signal input port is electrically connected with said shared port through said first microstrip arm and electrically connected with the other endof one of said mixer tubes through said shared port, wherein said local oscillator signal input port is electrically connected with said mixing output port through said second microstrip arm and electrically connected with the other end of the other said mixer tube through said mixing output port,such that when a local oscillator signal is input through said local oscillator signal input port and a feedback signal is input through said shared port, so as to allow the high frequency feedback signal and local oscillator signal output from said shared port and said mixing output port to said mixertubes to be conducted to the ground and allow the intermediate-frequency signal corresponding to the frequency difference of the local oscillator signal and the feedback signal to be extracted.

抗干擾振蕩電路

本發明提供一種天線，包括一參考地和至少一輻射源，其中所述輻射源被相鄰地設置于所述參考地，以在所述輻射源和所述參考地之間形成一輻射縫隙，其中所述輻射源被電氣連接于所述參考地以使所述輻射源接地，從而使所述天線的頻寬變窄。當一電磁激勵信號自所述輻射源的一饋電點被接入時，所述天線的頻寬變窄可以防止所述天線接收或產生的電磁波信號受到附近的相鄰頻段的電磁輻射頻率或雜散輻射頻率干擾。

微波多普勒探測模塊

本實用新型提供一種微波多普勒探測模塊，其中所述微波多普勒探測模塊包括一電磁反射面和與所述電磁反射面相間隔地被設置的至少一對對偶耦合極子，其中一對所述對偶耦合極子具有一第一饋電端和一第二饋電端并自兩所述饋電端分別延伸有一第一輻射源極和一第二輻射源極，其中所述第一饋電端和所述第二饋電端相互靠近，并當所述第一輻射源極和所述第二輻射源極分別于所述第一饋電端和所述第二饋電端被同一激勵信號饋源饋電時，所述第一輻射源極和所述第二輻射源極的電流與電位分布能夠以所述第一饋電端和所述第二饋電端的連線的中點呈對偶分布狀態而以對偶方式耦合，降低了對所述微波多普勒探測模塊的尺寸要求，并能夠避免形成探測死區。