This study describes a new low‐profile broadband circularly polarised (CP) antenna. The antenna comprises a directly fed CP patch of new configuration that excites four square parasitic patches in an upper layer and an L‐shaped parasite alongside the excited patch. This arrangement provides an improvement in axial ratio (AR) bandwidth over existing configurations, having an impedance bandwidth of 38% (return loss > 10 dB), with an AR bandwidth of 28.1% (AR < 3 dB) and a peak gain of 8.4 dBic.
For the first time, a novel narrow-band balanced bandpass filter (BPF) using two coupled rectangular dielectric resonators (DRs) is proposed. According to the electromagnetic (EM) field properties of the DR, the mode, as a dominate mode of the DR, can be differentially excited for constructing the fundamental passband of the balanced BPF. Meanwhile, the mode of the DR, functions as a common-mode response in this design, is tuned far away from in spectrum by optimizing the DR size so that the common-mode suppression in the differential passband can be improved significantly. To validate the proposed design concept, a second-order narrow-band balanced BPF is designed, fabricated and measured. The measured results show good agreement with the simulation data.Index Terms-Balanced bandpass filter (BPF), dielectric resonator (DR), narrow-band.
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