适用于无线通信系统具有滤波特性的微带天线设计

Design of microstrip antenna with filtering characteristic for wireless communication systems

    摘要
  • 摘要:
      目的  为开发一种具有传统辐射特性又具有较好带外抑制特性的微带天线，
      方法  采用滤波器综合设计方法，设计一种由微带天线、耦合线和2个谐振器组成的具有滤波特性的天线。微带天线除满足传统天线设计要求外，其外部品质因数应等于带通滤波器最后一个谐振器的外部品质因数，以实现微带天线代替滤波器最后一个谐振器后仍具有滤波器的各项性能；耦合线在滤波器设计中作为导纳变换器，以实现滤波器谐振器与微带天线间的能量耦合。
      结果  仿真结果表明：该微带天线的阻抗带宽为2.37~2.53 GHz，阻抗带宽内增益变化平缓，带内增益最大偏差约0.5 dB，最大增益为7.5 dB，在通带外100 MHz处增益迅速降为-10 dBi，具有较好的带外抑制特性。
      结论  该具有滤波特性的微带天线减小了滤波器与天线的总体尺寸，降低了滤波器与天线间的传输损耗，可以在现代无线通信系统中应用。

     

    Abstract:
      Objectives  This paper studies the development of a microstrip antenna with both traditional radiation characteristic and good out-of-band rejection characteristic.
      Methods  Through the filter integrated design method, the microstrip antenna with filtering characteristic, composed of a microstrip antenna, a coupled line, and two resonators is designed. In addition to the capability of meeting the traditional antenna design requirements, the microstrip antenna shall have the external quality factor that is equal to the external quality factor of the last resonator of the band-pass filter, thus enabling it to still function as a filter after being used as a substitute of the last resonator of the filter; in the filter design, the coupled line acts as an admittance converter to realize the energy coupling between the filter resonator and the microstrip antenna.
      Results  The simulation results show that as the impedance bandwidth is 2.37-2.53 GHz, the gain variation within the impedance bandwidth is gentle, the maximum in-band gain deviation is about 0.5 dB, the maximum gain is 7.5 dB, and the gain at 100 MHz outside the passband is rapidly reduced to -10 dBi, the microstrip antenna has good out-of-band rejection characteristic.
      Conclusions  The microstrip antenna with filtering characteristic designed in the paper reduces the overall size of filter and antenna and the transmission loss between the filter and the antenna, and can be used in modern communication systems.

     

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