Design Of Broadband Navigation Composite Antenna

The antenna apparatus as a radio communication system for receiving and transmitting electromagnetic waves,and plays an important role in a communication system,according to different radio systems,and the corresponding index structure of the antenna are not the same.Satellite navigation technology is widely used in various fields of national economy and military because of its functions of positioning,navigation,speed measurement and time service.As an important part of the satellite navigation system,the wide band,miniaturization and integration of the satellite navigation antenna have attracted the attention of researchers.According to the requirements of the frequency band of the global navigation satellite system,this paper designs a broadband satellite navigation antenna with small size,large gain,wide coverage of 3d B beam and high circularly polarized purity.The antenna is fed by a microstrip antenna with four feeds,which is slotted around the antenna patch and the coupling short circuit is added to improve the gain of the antenna.The impedance characteristics of antenna by L probe coupling structure to improve the antenna,improve the impedance bandwidth of the antenna feed network by using the broadband phase shifter network stripline structure,the bottom for the 180 degree phase shift network,the top two of the same structure 90 degree phase shift network,achieve four equal port output power by cascade,the adjacent port in turn signal with a 90 degree phase shift,and the two layer strip arranged in order to reduce the size of antenna feed network,so the phase shift is stable in a wide band signal coupled to the network through a shift of four L probes with 90 degree phase shift to the radiation patch,in order to achieve circular polarization antenna effect.Wireless local area network(WLAN)is a kind of mobile network access technology,which has the advantages of supporting mobile device access,easy networking,strong antiinterference and high data transmission rate.This paper introduces the design of a low profile,conformal conical sleeve monopole antenna according to the requirements of the Wi Fi band,and the short circuit loading technology of antenna around,in order to ensure satisfaction with high gain based on miniaturization,and horizontal omnidirectional.As a communication system,often has a communication frequency band,so the need for multiple antennas,due to space limitations and other requirements,the need for the integration of multiple antennas.Due to the combination of multiple antennas,the antenna can reduce the space occupied by the antenna,but it needs to consider the mutual coupling between antennas.According to the requirements of communication systems,the composite of satellite navigation antenna and wifi antenna,designed a work in the dual band dual polarization antenna,composite,navigation and data transmission to meet the communication requirements.