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In this paper, a novel method to implement capacitive coupling in planar (H-plane) waveguide filters is presented. It is shown that the signs of the coupling coefficients are, in certain situations, reversed from the predictions of the simpler given model. The principles of the change in the signs of coupling coefficients are presented and investigated in detail. A 3-pole H-plane example filter with...
This paper presents a collection of five filters in Ka-band using low temperature co-fired ceramic (LTCC) technology. Its purpose is to show an overview of the compacting possibilities with final sizes of complex designs in LTCC. The coupling matrix method is used in order to synthesize the frequency response of the filters, and the designs are carried out doing a systematic characterization of every...
A multilayer LTCC bandpass filter is proposed in this paper. The proposed filter consists of two pairs of improved stepped impedance resonators (SIR's). The improved SIR's have realized multi-coupling which makes the filter more compact. In addition, due to the multi-coupled SIR's, two transmission zeros are introduced to improve out-band characteristic of the filter. This filter has a central frequency...
A compact planar microstrip ultra-wideband (UWB) bandpass filter is presented. The proposed UWB filter is realised by cascading a highpass filter (HPF) and a lowpass filter (LPF). The HPF consists of complementary split-ring resonator (CSRR) with dual C-shaped couplings. The LPF is achieved by a hybrid microstrip and four backside corrugated slots etched on ground plane. Combining these two structures,...
This paper presents a novel Ku-band microstrip triple-mode bandpass filters with good square ratio and wide stopband rejection. The proposed novel triple-mode resonator is developed from T-shape dual-mode stub-loaded resonator. And the compact format of feed line enhances the parasitic coupling between input and output ports, so the filter can exhibit a quasi-elliptic response and good square ratio...
This paper describes a synthesis method for quadruple-passband microwave filters. A frequency transformation method is developed for finding the locations of poles and zeros of the filter response. An eight-pole microstrip quadruple-passband filter is synthesized for validation, with designed pass bands at 1.85–1.88, 1.943–1.97, 2.03–2.057, and 2.12–2.15 GHz. The filter is realized in microstrip and...
In this paper, a new coupling configuration of the stepped impedance resonator (SIR) has been presented to design dual-band bandpass filters with the small circuit size. We design the filter with higher selectivity based on SIR directing-coupling, cross-coupling, input and output external quality factors. Through resonance characteristics of a SIR, the second resonant frequency can be tuned by adjusting...
A compact wide-band bandpass filter (BPF) using the degenerate modes of a meander structure printed on the FR4 substrate is proposed. The resonator is based on a capacitive meander loop loaded with a perturbation strip at the center of the resonator for the coupling effects. Besides its simple structure, the filter shows low insertion loss and minified to small size, owing to the meander structure...
A novel stepped impedance resonator is proposed for a cavity resonator filter design. According to the basic principle of stepped impedance resonators SIR, a miniaturization coaxial cavity filter used in 3G communication is designed by using λg/4-type SIR as the basic harmonic unit. Simulation results show that compared with normal cavity filter, this filter has the advantages of small volume and...
Based on the design and improvement of traditional hairpin microstrip bandpass filter, a cross-hairpin bandpass filter is designed in this paper. The filter is used in WCDMA operating between 1920GHz and 1980GHz. This paper analyzes the filters consisting of two hairpin resonators of differential coupling structures and their 3D models are simulated using Momentum based on ADS. Comparison of simulation...
This paper presents a design of an improved on-chip open loop resonator band pass filter (OLR-BPF) for 60 GHz millimeter-wave applications in 0.18 µm CMOS technology. The proposed on-chip BPF employs the folded open loop structure on patterned ground shields. The adoption of a folded structure for the OLR-BPF and utilization of two transmissions zero permits a compact size and high selectivity for...
A direct synthesis method of elliptic function transmission-line filters is presented in this paper. The filter designs start from elliptic lumped prototype filters, and then Richards' transform is applied to obtain commensurate transmission-line circuits. To make the elliptic filters practicable in planar structures, two coupled-line structures and their equivalent circuits are introduced, and they...
A direct synthesis method is presented for folded bandpass filter prototype network. The prototype network consists of LC resonators coupled by frequency-dependent (L/C) couplings, which can model the filter responses over a wide frequency band. The synthesis method is generally applicable to a broad class of filtering characteristic functions. Commencing from transfer and reflection polynomials,...
This paper reports the application of non-resonating nodes to develop high-selectivity dual-passband microstrip filters. To this aim, these nodes are used as cross-coupling paths to increase the inter-resonator signal interactions. Thus, several transmission zeros can be created under signal-interference principles. Two alternative implementations for the non-resonating node, suitable for planar technologies,...
An original 3D pyramidal geometry for a low loss and compact (10.5 mm by 10.2 mm by 2 mm) filter is described in this paper. Nine low footprint Alumina filters are manufactured in one single fabrication by a 3D ceramic stereolithography process. Thank to this technology, high unloaded quality factor resonators (above 1000) have been fabricated and associated to create a low footprint 4-pole Chebyshev...
Dual-band filters are normally used for filtering two frequency bands that are not too close together. However, this paper presents a HTS dual-band bandpass filter that can be used to achieve isolation between two frequency bands that are only a few tens of MHz apart. Transmission zeros are placed in between the two frequency bands using electromagnetic coupling between non-adjacent resonators which...
A novel design concept for compact dual-band substrate integrated waveguide (SIW) filters using the complementary split-ring resonators (CSRRs) is presented. By loading two different types of CSRRs on the waveguide surface, two passbands propagating below the waveguide cutoff frequency are generated separately. The proposed structure allows relatively independent control over the center frequencies...
We present hermetically encapsulated, mechanically coupled, 20 MHz breathe-mode ring filters with ultra narrow bandwidths of 5.9 kHz and 8.9 kHz, which correspond to 0.029% and 0.044% bandwidth with less than 2.7 dB insertion loss. This is the narrowest percent bandwidth achieved by a mechanically coupled MEMS filter. The ability to attain an insertion loss this small for such a small percent bandwidth...
This paper presents a novel geometry for the realization of TM dual-mode cavities and filters having asymmetric filtering characteristics. In contrast to previous works, that are limited to structures with symmetric responses, the proposed cavity does not employ any intra-coupling elements, while the source and load of the cavity are directly coupled to both resonant modes. The latter coupling mechanism...
A new all-metal insert E-plane filter consisting of single, upper and lower ridge resonators placed alternatively along the waveguide housing is introduced. The proposed topology allows one, in large extent, to adjust the filter length, which can be particularly useful when designing manifold type diplexers of extracted pole variety. The concept has been validated by designing and manufacturing of...
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