一种应用于n77/n78/n79频段的双频滤波天线

提出了一种基于双层结构的双频滤波天线，工作在n77/n78/n79频段。该天线由上层基板的2个矩形辐射贴片和下层基板的阶跃阻抗谐振器、2个“L”型枝节组成。2块介质基板材料均为FR4，且通过探针相连。上层介质基板上的2个矩形辐射贴片激发2个谐振模式，其中高频谐振用于形成n79频段，低频谐振用于形成n77/n78频段。为了获得双通带滤波效果，在下层介质基板中引入阶跃阻抗谐振器，在2个频段间形成带外辐射零点。此外，下层基板上的“L”型枝节可以引入额外的谐振点来扩大天线的带宽。该结构经过高频仿真软件(HFSS)优化，其仿真结果和测试结果均在3.37~3.53 GHz(n77/n78)，4.55~4.64 GHz(n79)2个频段范围内，可用于6 GHz以下5G的无线通信应用。

A dual-band filtering antenna for application of n77/n78/n79 bands

A dual-band filtering antenna based on a double-layer structure working in the n77/n78/n79 frequency bands is proposed. The antenna consists of two rectangular radiation patches on the upper substrate, step impedance resonators and two L-shaped branches on the lower substrate. The two dielectric substrates(FR4) are connected by probes. The two rectangular radiation patches on the upper dielectric substrate excite two resonant modes, among which the high-band resonance is employed to form the n79 frequency band, and the low-frequency resonance is employed to form the n77/n78 frequency band. In order to obtain the double bandpass filtering effect, a Step Impedance Resonator(SIR) is introduced into the lower dielectric substrate to form an out-of-band radiation nulls between the two frequency bands. In addition, the L-shaped branches on the lower substrate can introduce additional resonance points to expand the bandwidth of the antenna. The structure is optimized by High Frequency Simulation Software(HFSS). Its simulation results and test results cover the two frequency bands of 3.37~3.53 GHz(n77/n78) and 4.55~4.64 GHz(n79).The proposed antenna can be used for sub-6 GHz 5G wireless communication applications.