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In this paper, a compact quasi-Yagi antenna with ultra-wideband balun filter is presented. The proposed balun filter is constructed with composite microstrip and slotline resonators. With the excited three resonant modes of slotline resonator and two additional resonant modes of microstrip lines, the balun filter with ultra-wideband response can be realized. Thus, with this proposed ultra-wideband...
This paper proposed a wideband bandpass filter with reconfigurable bandwidth using a cross shaped resonator. The proposed resonator has wide passband which can be used to implement a wideband bandpass filter. Moreover, the fractional bandwidth of this filter is only related to the characteristic impedance of the resonator stubs, using two sets of diodes can achieve the fractional bandwidth tuning...
This paper presents a microstrip dual-band bandpass filter (BPF) based on cross-shaped resonator and spurline. It is shown that spurlines added into input/output ports of a cross-shaped resonator generate an additional notch band. Using even and odd-mode analysis the proposed structure is realized and designed. The proposed bandpass filter has dual passband from 1.9 GHz to 2.4 GHz and 9.5 GHz to 11...
An ultra-wideband (UWB) bandpass filter (BPF) with two reconfigurable notch bands is proposed, based on cross-shaped resonator (CSR) without using coupled line structure. With the use of even and odd-mode approaches, the proposed UWB bandpass filter bandwidth is from 2.8–10.9 GHz, with 118% fractional bandwidth (FBW), and the dual reconfigurable notch bands is tuned from 4–5.3 GHz, and 7.9–8.8GHz.
A fully tunable bandpass filter using tunable transformers and multiple mode resonators (MMRs) is proposed. The proposed tunable MMR makes it possible to realize wide-band tunable filters. Thus the tuning ranges of the center frequency and bandwidth are wide. The novel tunable transformer may help to get the desired external quality factor (Qe) while the center frequency or bandwidth is tuned. Thus...
In this paper, a tunable microstrip antenna-filter is proposed based on a double U-shaped defected ground structure (DGS) and compact tunable square-loop dual-mode bandpass filter using capacitively loaded resonator. The antenna structure consists of a simple trapezoid monopole with a DGS microstrip feedline for excitation and this also yields a broaden impedance bandwidth covering 0.8 GHz to 2 GHz...
In this letter, double-sided parallel-strip line (DSPSL) has been used to build a novel differential filter with ultra- wideband (UWB) response. Swap structures, based on DSPSL, are employed in the design to realize 180° phase shift. So the swap structures can realize the conversion between differential- and common-mode. Utilizing the characteristic, the input common- mode signals will be cancelled...
A novel miniaturized microstrip dual-mode bandpass filter with simultaneous size reduction and spurious responses suppression is proposed. In this new filter structure, the stepped-impedance resonator (SIR) technique is used to not only shorten the resonator size but also suppress its spurious responses. A prototype dual-mode bandpass filter centered at 1.6 GHz with 3% FBW is designed and experimentally...
A novel compact microstrip dual-band bandpass filter based on transversal structure and centrally capacitive load is proposed. Take full advantage of the full-wavelength resonator and centrally capacitive load, two filter passbands can be designed independently whilst the transmission zero of transversal filtering is kept; and spurious at lower frequency is eliminated simultaneously. A dual-band prototype...
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