HTS AMPS-A and AMPS-B filters for cellular receive base stations

• Published in: IEEE transactions on applied superconductivity Vol. 9; no. 2; pp. 4018 - 4021
• Main Authors: Soares, E.R., Raihn, K.F., Davis, A.A., Alvarez, R.L., Marozick, P.J., Hey-Shipton, G.L.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.1999; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Band pass filters; Band spectra; Bandpass filters; Bands; Base stations; Cellular; Digital modulation; Equipments and installations; Exact sciences and technology; Filtering theory; Frequency; High temperature superconductors; Low-noise amplifiers; Mathematical analysis; Mobile radiocommunication systems; Radio spectrum management; Radiocommunications; Ripples; Stations; Superconducting filters; Superconducting materials; Superconductivity; Telecommunications; Telecommunications and information theory; High performance; Circuit design; s parameter; Base station; Band pass filter; Cell network; HTS filter; High temperature superconductor
• DOI: 10.1109/77.783909
• ISSN: 1051-8223

The multiple, interleaved pass band nature of the AMPS cellular system provides an excellent opportunity for high performance HTS filter technology for base station reverse link applications. The 25 MHz spectrum is divided into 4 unequal bands, 2 each for the A and B operators. For AMPS-A, the two band pass filters are connected in parallel, while for AMPS-B a band pass filter is cascaded with a band reject filter. All band pass filters have finite transmission zeros and the band reject filter is designed to have an equal ripple stop band. The design and performance of high selectivity filters for this application is described.