| With the arrival of the fifth generation communication technology,more and more rich spectrum resources have been developed and utilized and come into the eyes of researchers.And millimeter wave communication technology has attracted the attention of many researchers due to its high transmission rate,high channel capacity and low transmission delay.At present,the specific mm-wave frequency band division published is not a continuous band,but contains multiple discrete bands,such as Ka band(26.5～40GHz),Q band(30～50GHz),etc.,while the mm-wave multi-band antenna can make the antenna work in multiple bands at the same time.At the same time,in the modern communication systems,the interaction between the system and the system,the amount of data transferred also becomes more and more big,more and more,the transmission speed is also becoming more and more quickly,which requires the capacity of the system need enough big,link to open enough,and millimeter-wave broadband antenna can meet the demand of wireless communication system,It can be used to improve the communication quality of communication system.Based on the above research background and development needs,this paper has done some research on millimeter wave broadband antenna and dual-band antenna.The main research contents are as follows:1.A millimeter-wave broadband log-periodic antenna operating in the Q-band based on a multilayer PCB structure is proposed in this paper.The antenna element is fed by a broadband balun composed of sector slot and microstrip line.The log-periodic antenna element in this paper is formed by four dipole antennas,each of which is located on a dielectric substrate with different thicknesses from top to bottom and the dipoles are connected by metallic vias.At the same time,in order to obtain higher gain to meet the working requirements of the millimeter wave frequency band,a 4 4 antenna array is proposed in this chapter.The structure of the antenna array is symmetrical,and in order to ensure that the proposed antenna array can get a great cross-polarization level,the method of differential feeding is used to feed the antenna array.The simulated results show that the impedance bandwidth of the proposed antenna array is 31.4%(31.7GHz～43.6GHz),and the maximum realized gain in the operating frequency band is 17 d Bi;the measured results show that the bandwidth of the proposed antenna array is 32.5%(32.5GHz～45GHz),the maximum realized gain in the operating frequency band is 15.5d Bi.The content of this part has been submitted to AWPL,and the invention patent has been submitted.2.A 5G millimeter-wave dual-band antenna based on double split ring is researched,designed and produced.The microstrip double split-ring structure is used to realize the dualfrequency operation characteristics of the antenna in the millimeter wave frequency band,and the microstrip slot coupling structure is used to achieve differential feeding of the antenna element.The designed antenna realizes the dual-band characteristic of the antenna by performing split-ring operation on the microstrip double-ring antenna,thereby producing two double-ring antennas with different radii.At the same time,by loading the radiation branch in the middle of the dual-ring antenna,the high-frequency gain and radiation characteristics of the proposed antenna element can be effectively improved,and the high-frequency sidelobe level of the proposed antenna is reduced.Finally,through the simulate of electromagnetic simulation software,we can obtain that the current antenna element can obtain lower cross-polarization level and sidelobe level in the working frequency band.Based on the proposed millimeter-wave dual-band antenna element,in order to get higher radiation gain,a 1×4 antenna array is designed and measured.The measured results show that the working frequency bands of the proposed antenna array in the two bands are 26GHz～29.4GHz and 36.8GHz～38.65 GHz respectively,the maximum gain obtained was 12.7d Bi at low frequency and 14.9d Bi at high frequency.The content of this part has been submitted to AWPL,and the invention patent has been submitted. |
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