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A novel reflection-absorptive harmonic-rejection filter (RA-HRF) is presented for harmonic-terminated high-efficiency RF power amplifier (PA). It basically consists of a pair of reactive band-rejection filter and a dual-band Wilkinson power divider where its isolation resistor absorbs the reflected signals from the band-rejection filters. The reflection-absorptive property can solve a parasitic anti-resonance...
Adjacent channel leakage power ratio (ACLR) improvement method of a 5-GHz power amplifier using high-temperature superconducting reaction-type transmitting filters (HTS-RTF) is proposed. The aim of this paper is to clarify the amount of ACLR improvement which is offered by HTS-RTFs. Firstly, measurement results of ACLR improvement using a prototype filter is introduced. The prototype filter has an...
In order to meet stringent requirements on transmit filters, high-Tc superconducting dual-mode disk resonators with attenuation poles have been designed, fabricated, and measured. Using a ground-slot perturbation along the asymmetric plane from the feeder lines, the resonator fabricated with YBCO superconducting double-sided films showed high performance with attenuation poles at the both sides of...
An high-temperature superconducting reaction-type transmitting filter (HTS-RTF) based upon split open-ring resonators with novel surface current density reduction technique is proposed. Since reaction-type resonators do not resonate with high-power fundamental signals, an HTS-RTF enables both high-power handling capability and steep skirt property compared to existing planar-type HTS transmitting...
We propose a front-end with a combination of a circulator and receive and transmit superconducting filters (SCFs) for applications to the base stations of the future generation wireless communications. Ideally, all superconducting filters used are desirable. We made and estimated a preliminary front-end model with a volume of 43 liters using a duplexer, superconducting filters, and a cryo low noise...
Novel planar construction of high-temperature superconducting (HTS) filters that improve power-handling capability is proposed. Split open-ring resonators are developed to be used in reaction-type transmitting filters that have very sharp bandstop characteristics. Resonator structures to achieve high-unloaded Q-factors and low radiation as well as low surface current densities in the passband are...
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