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A broadband low profile microstrip filter-antenna with an omni-directional pattern is presented. A coupled line is used to connect a microstrip antenna and the second resonator of a filter as admittance inverter. In the design, the antenna performs as a radiator; meanwhile it is also the last resonator of the bandpass filter. Therefore, the loss is reduced between the filter and the microstrip antenna...
A novel ultra-wideband (UWB) bandpass filter (BPF) with a notched band is presented, using a pair of triangle ring resonators with four open-stubs and defected ground structures (DGS). The double triangle ring resonators with four open-stubs which feed by a pair of interdigital coupled structure can obtain a UWB band with three modes. Then the medial circle ring DGS is added to create a notched band...
This paper presents a compact planar micro strip ultra-wideband (UWB) band pass filter (BPF) for the use in UWB wireless communication applications set by Federal Communications Commission (FCC). The filter is compact in size with dimension 17 X 17 X 1 mm3 of the ground plane. For designing of this structure FR-4 substrate having thickness of 1 mm and dielectric constant of 4.9 has been used. The...
A compact ultra-wideband (UWB) bandpass filter with an inherent notched band and steep slopes has been presented and implemented with the low temperature cofired ceramic technology. The filter is realized by a stepped-impedance T-shaped resonator (SITR) coupled to a pair of quarter-wavelength input/output feed-lines. The proposed SITR can facilitate not only a notched band, but also sharp roll-off...
A compact differential bandpass filter (BPF) based on Coupled Cross-Shaped Resonator (CCSR) with short termination is presented in this paper. The differential-mode (DM) and common-mode (CM) equivalent half circuits of proposed CCSR are given and discussed. In DM operation, a wide passband is designed from 4.0 GHz to 5.0 GHz with a fractional bandwidth (FBW) of 22% Under CM condition, controllable...
High-Q tunable filters are in demand in both wireless and satellite applications. The need for tunability and configurability in wireless systems arises when deploying different systems that coexist geographically. Such deployments take place regularly when an operator has already installed a network and needs to add a new-generation network, for example, to add a long-term evolution (LTE) network...
A new microstrip ultra-wideband (UWB) bandpass filter (BPF) with dual sharply rejected notched bands based on E-shaped resonator is proposed in this letter. The basic UWB BPF is designed using interdigital coupled lines and rectangular patch multiple-mode resonator (MMR). Then, the resonance properties of the E-shaped resonator are studied. The analyzed results reveal that the dual-mode resonant property...
A UWB band pass filter with ultra wide upper stopband is presented. A broad high selective notch band is also introduced in UWB passband to stop WLAN signals interference. The UWB filter is realized with a basic MMR structure. To achieve wide upper stop band a sharp cutoff lowpass filter is cascaded along with MMR. To eliminate WLAN signals from 5.15 to 5.5 GHz a dual mode fractal bandstop filter...
A new wideband LTCC bandpass filter with high stopband rejection is proposed in this paper. The filter with a central frequency of 1.5GHz and a 40% passband is implemented by using a five-resonator chebysheve bandpass filter circuit model. In order to achieve the excellent out-of-band suppression, an improved bandpass filter circuit with two transmission zeros by employing circuit transformation theory...
In this paper, realization of a novel extremely compact dual notch-bands (DNBs) ultra-wideband band-pass filter (UWB BPF) is investigated using combination of μ-strip multiple-mode resonators (MMRs) loaded with high-impedance open stubs without any via-hole or complicated multi-layer technology to facilitate the design process of this type of BPF. Here is also elaborated the realization of four transmission...
Generally, if using single low performance discrete PIN diode, it is difficult to get high isolation of Single Pole Double Throw (SPDT) switch at 2 GHz band. The PIN diodes are usually packaged in a standard package such as SOT23, SOT323, SOD323 or SOD523. Therefore, this paper proposed single switchable open stub resonator for isolation improvement of shunt SPDT discrete PIN diode switch for Time...
A compact quadruple-mode ultra-wideband (UWB) bandpass filter with sharp selectivity and extremely wide upper stopband is proposed in this paper, using a multi-stage stepped-impedance resonator, two open-circuited ends and a pair of high-low impedance stubs. The characteristics of the proposed multimode resonator are analyzed by simulation, demonstrating that the first four resonant modes can be appropriately...
We propose the improved configurations with dual-mode dual-square-loop resonators (DMDSLR) for quad-band applications. The resonant frequency equations of DMDSLR are introduced for simply designing quad-band bandpass filter (BPF). Resonant frequencies can be controlled by tuning the perimeter ratio of the square loops. To obtain lower insertion loss, higher out-of-band rejection level and wider bandwidth...
Tri-band bandpass filter using single open or short stub loaded resonators is presented in this paper. The second and the third resonant frequencies of the open stub loaded resonator can be flexibly controlled by tuning the length and impedance of the open stub, whereas the first resonant frequency is fixed. The first and the third resonant frequencies of the short stub loaded resonator can be flexibly...
A notch band ultra-wideband bandpass filter with good out-of-band rejection, controllable and multiple transmission zeros in notch band and good inband performance is presented in this paper. A shunt short-circuited stub is used to build up the initial ultra-wideband skirt. A slot is then embedded into the short-circuited stub to achieve cross-coupled effects. This cross-coupled circuit can effectively...
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...
This paper proposes an ultra-wideband bandpass filter based on slotted linear tapered-line resonator (SLTR) with embedded fold-slot feed structure which can create dual-notched band. The embedded fold-slot feed at both ends of resonator will be comprehensively described. The proposed filter has two notches in the passband, resulting from the embedded fold-slot feed. The center frequencies and bandwidths...
A 46MHz centre frequency, 2.046MHz bandwidth 6th order Chebyshev-I band pass integrated filter using a biquad Gm-C structure is designed and implemented. Negative resistance cells are used in the biquad structure to obtain high Q of the filter. The Tran conductor has a high linearity with source degeneration technique using MOS resistors. The whole filter circuit is designed and simulated in 0.35µm...
In this paper, a duplexer using the open stub band-pass filter(BPF) with parallel coupled line is presented. The suggested duplexer is composed of distributed elements and planar substrate and it has characteristic of excellent isolation. The operating frequencies of the duplexer are respectively 5.8 GHz and 4.8 GHz at the RX and TX for C-band wireless communication systems. Also, the deviation frequency...
A novel ultra-wideband (UWB) bandpass filter (BPF) with dual notched bands using the hybrid microstrip and coplanar waveguide (CPW) structure is proposed, to prevent interference problems between the UWB radio system and existing radio systems. A multiple-mode resonator on a CPW is formed to allocate its first three resonant modes around the lower-end, centre and upper-end of the 3.1 to 10.6 GHz UWB...
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