Patent ID: 6307524
Filing Date: 2001-10-23
Classification: H01Q

Abstract:
A Yagi antenna, comprising:an insulative circuit board having a proximal end and a distal end;a J-shaped driven element having an impedance .OMEGA.d and being printed on a top surface of the circuit board, wherein the J-shaped driven element comprises a short portion, a long portion that is twice as long as the short portion, and a connecting portion connecting the short portion and the long portion, the short and long portions being parallel to each other, and wherein a mid-point of the long portion of the J-shaped driven element is grounded;one or more director elements printed on a top surface of the circuit board at a position located between the distal end of the circuit board and the J-shaped driven element;a reflector element printed on a bottom surface of the circuit board at a position located between the proximal end of the circuit board and the J-shaped driven element;a microstrip transmission line printed on the circuit board, the microstrip transmission line having a proximal end, a distal end, and an impedance .OMEGA.w, the distal end of the microstrip transmission line being electrically connected to the J-shaped driven element; anda cable having an impedance .OMEGA.c, the cable being electrically connected to the proximal end of the microstrip transmission line, wherein the impedance .OMEGA.c matches the impedances .OMEGA.d and .OMEGA.w.