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In this letter, a balanced-to-unbalanced (balun) bandpass filter (BPF) with capacitive loaded coupled lines is presented. The bandpass filter is realized by two half-wavelength resonators which are coupled at their ends. Thus, it adds extra transmission zeros to the filter, which can effectively reject strong interference in the stopband. By using the symmetric and skew-symmetric feed structures,...
A co-planar waveguide (CPW) structure is proposed and implemented for notched band designing of ultra-wideband (UWB) bandpass filter (BPF) in this paper. This structure can be easily designed and applied for multiple notched bands, and the size of filter will not be increased. As the starting work of this letter, a single notched band has been constructed and the theory of it will be proposed, and...
In this paper, we have presented the transmitter, antenna array, transmission and evaluation of the circularly polarized ultra-wideband signal at boresight direction. From measurements, it has been shown that, in the frequency band of 2.6-5.5 GHz, the transmitted signal has axial ratio of < 1 dB, polarization tilt between plusmn30deg, and left-hand polarization sense.
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