Previous microwave distributed bandstop filters have had their second harmonic response centered at no more than three times the fundamental mid-band frequency, due to use of quarter-wave resonators. This limitation has now been removed by compound resonators having shorter electrical length. Some configurations incorporate lumped capacitors, resulting in additional design degrees freedom and wider passbands. The new theory developed apply both wide narrow stopbands. Example upper passband...

This article reports a three-channel, noncontiguous, manifold multiplexer operating from 220 to 330 GHz, 40% fractional bandwidth. The structure is designed and implemented using set of ridged substrate integrated waveguides (SIWs). SIW improves the stopband bandwidth reduces overall size by 35% over conventional design. triplexer utilizes an organic package technology developed Intel, featuring four thick copper metal layers continuous trench vias in lieu standard via fences, which...

This article investigates a diplexer design technique utilizing the strengths of both EM- and circuit-based simulators to provide accurate results with reduced computation times. The EM circuit cosimulation effectively reduces overall time in passive component design, while achieving results. method can be extended other designs, such as comb-line filter dielectric resonator filter, higher-order mode waveport calculation

We report structural, compositional, and magnetic properties for a commercially available doped barium hexaferrite material produced by Temex Ceramics. The is designed to absorb electromagnetic radiation near the upper edge of Ku frequency band (∼18 GHz) may serve as an important component microwave circuitry. To aid in development such circuits that utilize this or similar materials, we present results raw starting powder, sintered pucks, form film deposited aerosol deposition. find...

A new reconfigurable bandstop filter class is proposed, which has the unique property of possessing multiple insertion loss states with a common group delay state. These filters switch between low-insertion-loss allpass state and high-rejection The theory, synthesis, design these are presented. As demonstration concept, fourth-order constant-group-delay switched microstrip prototype was designed, built, tested. measured bandstop-state center frequency 1000 MHz, 3-dB bandwidth 119.15 stopband...

Two new classes of RF-power-dependent tunable bandstop filters that share a common filter topology are presented in this paper. RF-power-activated transition from resonant-allpass response to the presence high-power RF signal, allowing for optimum use spectrum when used solve interference issues receiver. Signal-tracking automatically tune their center frequencies eliminating need complex sensing and control systems. The theory design as well laboratory prototypes both. prototype achieves...

We present initial magnetic and structural characterization results of pressing barium hexaferrite pucks under the influence a field using custom-built uniaxial press. The press can be operated up to 500 pounds load inside 30 kG axially uniform field. details on system specifications operation procedures as well in 0, 25, or find that pressed 25 show similar properties but are significantly magnetically crystallographically textured along direction used during compared no-field pucks. For...

A Parallel-coupled line notch filter is introduced displaying a spurious-free passband region up to more than four times the stopband center frequency. An example presented with 4.3 GHz frequency, an upper extending beyond 18 GHz.

The theory of bandstop filters with minimum through-line length is developed in this paper. In contrast to conventional similar-resonator that employ odd multiples 90-degree impedance inverters between resonators, the proposed design technique enables restricted only which required obtain a desired coupling coefficient magnitude resonator and through-line. Both even- odd-order designs are shown verify concept. A 4 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

A new design technique is introduced for designing a 360-degree linear analog phase shifter at 5.2 GHz. Using tunable short-circuit terminated combline (STCL) filters as reactive loads, the circuit gives very small insertion loss (less than 1.5 dB) and an almost shift over filter bandwidth full range.

A second-order cross-coupled combline filter which has three finite transmission zeros is presented. The problem of the frequency-invariant coupling in a real circuit introduced. To make extra zeros, top metalized dielectric block used.

A six-pole folded 1030 MHz notch filter is introduced using high dielectric partially metallized evanescent mode resonators, intended for power application. The proposed structure employs low-profile puck resonators operated below the cutoff frequency cross-section. overall size of relatively small compared to cavity type or half-wave length waveguide and indeed smaller than popular capacitively coupled short circuited coaxial resonator design. Performance at least comparable.

A new bandstop filter design is proposed using evanescent mode cavities consisting of short-circuited lengths cylindrical waveguide operated below cutoff frequency. The shows a very high Q response at lower frequencies, unavailable with lumped element approach, and smaller physical size than can be achieved coaxial structures.

Full duplex communication systems promise to double the available spectrum by enabling simultaneous transmit and receive capabilities. Receiver linearity its effective isolation from transmitter must be extremely large allow detection of any desired signals in presence self-interference within receiver bandwidth. Echoes environment may introduce additional distortion that further hinder detection. These challenges are multiplied if full capability is achieved over wide bandwidths. This paper...

A full elliptic bandstop filter using direct circuit transformations is designed, without optimization, for an X-band application. The proposed structure eliminates a possible spurious resonance in the passband, usually caused by tuning elements or reactive terminations previously required less than ㎻/4-wavelength resonators.

Ahstract- The integration of a resonant power sensor, switch driver circuit, and switchable bandstop filter is shown in this paper. co-design these circuits enable that autonomously responds to an unexpected above-threshold interfering signal within its bandwidth orders magnitude less time than conventional or tunable filters. In contrast limiter are based on PIN diodes switched by RF power, the proposed autonomously-switchable has high linearity all states. A third-order suspended-stripline...

Power-dependent switchable bandstop filters are discussed in this paper. The co-design of a filter, sensing bandpass analog circuit, and switch driving circuit enable all-pass-to-bandstop that automatically activate when power above designable threshold is present within the bandwidth filter. A third-order suspended-stripline power-activated filter with second-order resonant sensor was fabricated measured to test technique at 2.15 GHz. all-pass state has less than 1.7 dB insertion loss while...

A structure consisting of dielectric-loaded feed lines (such as surface-wave similar to Goubau lines) and below-cutoff air-filled cavities can be used form essentially L-C sections. The capacitance is due electric-field coupling from the feed-line dielectric medium into section. inductance results combining inductors in inductive tee equivalent circuit for such Dielectric loading shorten guide wavelength at input evanescent section, increasing effective inductance. dielectrically loaded...

In wireless communication, there is a strong demand for tunable filters in scenarios that require adaptively coping with multiband interference RF front ends. Tuning devices, ferroelectric capacitors, ferromagnetic-material-based microelectromechanical systems and piezoelectric-material-based devices are commonly used center frequency tuning or bandwidth adjustment filter realizations. Tunable switchable essential this desired adaptability. However, each type has thus far demonstrated its...

A new switchable low-loss bandstop filter is presented based on an indirect switching method combined with all-pass coupled lines. The proposed design allows between mode and a for On/Off operation of response. Due to the location switch, which outside through line, passband insertion loss drastically improved this compared conventional configuration. In addition, provides consistent group delay throughout in both mode, capability that not commonly available multi-path-type switched...

A cylindrical cavity is partially loaded with a high dielectric constant disk that provided an appropriate longitudinal slot. The resonance of the thus split into pair dual modes approximately HE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11delta</sub> dependency. configuration similar to TE xmlns:xlink="http://www.w3.org/1999/xlink">111</sub> mode dual-mode resonator but addition disk, forming "composite" resonator. self-resonant frequency...

A broadband contiguous multiplexer is introduced using octave-bandwidth pseudo-highpass filters. The proposed design minimizes the number of capacitors in highpass channel filters, which total radiation loss from capacitors. It enables single-layer fabrication such as microstrip line facilitates size reduction high dielectric constant substrate. DC-18 GHz triplexer fabricated on a substrate and measured to demonstrate performance has three channels at DC-6 GHz, 6-12 12-18 bandwidth with...

A new design topology for a broadband channelizer and re-combiner sub-channel signal processing in RF-front ends is introduced by utilizing back-to-back connected multiplexers. The proposed configuration uses the multiplexer networks with parallel-connected of filters that have complementary even-number-order channel networks. improves insertion loss almost two times case using conventional cascaded diplexer configuration. obtained uniform over multi-octave bandwidth which eliminates...