A four-pole elliptic-function bandpass filter is designed using a compact miniaturized microstrip hairpin resonator. This miniaturized hairpin resonator is realized by using a stepped-impedance structure with parallel coupled lines. In addition, the bandpass filter is implemented using a high-permittivity ceramic substrate. These factors result in the reduction of the filter's size. The full-wave simulator IE3D is used to design the hairpin resonator, and to calculate the coupling coefficient of the basic coupling strictures. The responses of the fabricated filters using Al2O3 (εr = 9.7, Q × f = 350,000 GHz) and MgNb2O 6 (εr = 20, Q × f = 110,000 GHz) ceramic substrates are designed at a center frequency of 2 GHz. The compact size and the performance of this class of filters are demonstrated.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Electrical and Electronic Engineering