Eight-frequency band antenna

Abstract

An eight-frequency band antenna includes a carrier, a high-frequency segment, a low-frequency segment, a printed circuit board (PCB) and an inductor. The high-frequency segment is arranged on left side of the carrier and the low-frequency segment is arranged on right side of the carrier. The radiator on the bottom face of the carrier electrically connects with the micro strip of the PCB and the ground line of the ground metal when the carrier is fixed to the PCB. Moreover, the low-frequency segment is corresponding to a metal face with smaller area such that the low-frequency segment is at a free space to enhance the frequency response of the low-frequency segment and the bandwidth of the high-frequency segment. The area and the volume of blind hole on the carrier can adjust the effective dielectric constant to adjust the resonant frequency and bandwidth of the antenna.

What is claimed is: 
     
         1 . An eight-frequency band antenna, comprising:
 a carrier being a ceramic rectangular body and comprising a front face, a top face, a back face and a bottom face, the carrier having a plurality of blind holes defined on the front face and concave into the carrier, and at least one rib between two adjacent blind holes;   a high-frequency segment arranged on left portions of the front face, the top face, the back face and the bottom face of the carrier if viewing from the front face of the carrier;   a low-frequency segment arranged on right portions of the front face, the top face, the back face and the bottom face of the carrier if viewing from the front face of the carrier;   a printed circuit board (PCB) having a top side, a left slanting side, a slanting bottom side, a right short side, a recessed side and a right long side, the PCB having a first face and a second face, the first face having a first ground metal face and a micro strip, the micro strip having a front section and a rear section, the front section having a through hole, the micro strip having a front portion extended into the first ground metal face such that a gap is defined between the micro strip and the first ground metal face,   the first face of the PCB having an opened area with two fixing ends; an area portion of the first ground metal face, which is from the left slanting side to the gap being larger than an area portion of the first ground metal face, which is from the recessed side to the gap, a ground line extended on the smaller area portion of the first ground metal face extended from the recessed side to the gap, a separation defined between the ground line and the rear section of the micro strip, the first face having an opened area with two fixed ends;   an inductor arranged across the separation with one end electrically connecting with the rear section of the micro strip and another end electrically connecting with the ground line,   wherein the two fixed ends of the opened area of the first face are fixed to the bottom face of the carrier such that the low-frequency segment is corresponding the recessed side and corresponding to the smaller area portion of the first ground metal face extended from the recessed side to the gap and the low-frequency segment is at a free space to enhance a frequency response of the low-frequency segment and to enhance a bandwidth of the high-frequency segment.   
     
     
         2 . The eight-frequency band antenna in  claim 1 , wherein an area ratio of the blind holes on the front face and a volume ratio of the blind holes with respect to the carrier is adjustable to adjust an effective dielectric constant of the carrier, thus adjusting resonant frequency and the bandwidth. 
     
     
         3 . The eight-frequency band antenna in  claim 2 , wherein the area ratio of the blind holes on the front face is 30%-50%. 
     
     
         4 . The eight-frequency band antenna in  claim 3 , wherein the area ratio of the blind holes on the front face is 40%. 
     
     
         5 . The eight-frequency band antenna in  claim 2 , wherein the volume ratio of the blind holes with respect to the carrier is 20%-30%. 
     
     
         6 . The eight-frequency band antenna in  claim 5 , wherein the volume ratio of the blind holes with respect to the carrier is 24%. 
     
     
         7 . The eight-frequency band antenna in  claim 1 , wherein the high-frequency segment has a double-T shaped radiator, a first L-shaped radiator, a straight shape radiator, a winding radiator and a second L-shaped radiator, the double-T shaped radiator being arranged on of the front face, the top face, the back face and the bottom face of the carrier, and a portion of the double-T shaped radiator, which is arranged on the on the bottom face being used as fixed point for PCB, a bottom part of the double-T shaped radiator electrically connects with one end of a short side of the first L-shaped radiator is arranged on the bottom face, the other end of the short side of the first L-shaped radiator electrically connects with the straight shape radiator arranged on the front face and the bottom face, the straight shape radiator electrically connecting with the micro strip, a long side of the first L-shaped radiator arranged on the top face and the back face coupled to the winding radiator arranged on the top face and the back face, the second L-shaped radiator being arranged on the front face and the bottom face, a short side of the second L-shaped radiator being parallel to the straight shape radiator, a long side of the second L-shaped radiator being vertical to the straight shape radiator and parallel to the winding radiator, the long side of the second L-shaped radiator electrically connected with the ground line. 
     
     
         8 . The eight-frequency band antenna in  claim 7 , wherein the high-frequency segment provides a fourth frequency band, a fifth frequency band, a sixth frequency band, a seventh frequency band, and an eighth frequency band, and the fourth frequency band, the fifth frequency band, the sixth frequency band, the seventh frequency band, and the eighth frequency band are within 1710 MHZ˜2700 MHZ. 
     
     
         9 . The eight-frequency band antenna in  claim 8 , wherein pitches of the winding radiator are around 0.15 mm˜0.3 mm to provide LC resonance with 2400 MHZ˜2700 MHZ resonant frequency. 
     
     
         10 . The eight-frequency band antenna in  claim 8 , wherein the low-frequency segment comprising a first rectangular radiator, a second rectangular radiator, a third rectangular radiator and a fourth rectangular radiator arranged respectively the front face, the top face, the back face and the bottom face of the carrier and having different areas, the third rectangular radiator arranged on the back face is fixed point with the PCB. 
     
     
         11 . The eight-frequency band antenna in  claim 10 , wherein the low-frequency segment provides a first frequency band, a second frequency band, and a third frequency band, and the first frequency band, the second frequency band, and the third frequency band are within 700 MHZ˜960 MHZ. 
     
     
         12 . The eight-frequency band antenna in  claim 11 , wherein the second face has a second ground metal face, the through hole is opened to the second ground metal face and electrically connects with a signal feeding end of a coaxial cable, the second ground metal face electrically connects with a ground end of the coaxial cable.