An original and simple approach to the design of fully reconfigurable multi-band microwave bandpass filters (BPFs) with an arbitrary number passbands is reported in this paper. It exploits use innovative quasi-BPF configuration made up different sets controllable mono-frequency resonators separately shape each tunable passband. Thus, high-selectivity filtering transfer functions exhibiting independent control terms center frequency, bandwidth, transmission zeros can be synthesized....

The prospects for and the state of art adaptable RF hardware are reviewed, focusing primarily on traditional frequency planning bottleneck, filtering stages. First, a case is made that even banded systems can be greatly impacted by modest amount tuning. This done showing results fixed system in an unlicensed band upgraded with programmable front-end filter. Next, built specifically wideband tuning shown enables selection across 20-MHz-6-GHz-band. Cooperative operation multiple colocated...

With the exception of predistortion, most design methods for microwave filters are based on lossless prototype networks, with effects loss generally being considered afterwards, by analysis rather than synthesis. This paper presents new techniques, which either utilize existing losses, or add to improve performance bandpass filters. Unlike these techniques result in networks nonuniform dissipation. Experimental have been designed and measured results demonstrate improved compared that...

Intrinsically switched tunable filters are on and off using the tuning elements that tune their center frequencies and/or bandwidths, without requiring an increase in range of elements. Because external RF switches not needed, substantial improvements insertion loss, linearity, dc power consumption, control complexity, size, weight possible compared to conventional approaches. An intrinsically varactor-tuned bandstop filter bandpass bank demonstrated here for first time. The prototype has a...

A new class of adaptive Wilkinson-type filtering power divider that simultaneously exhibits single/multi-band operation, frequency tuning, and controllable number passbands is reported. It exploits the incorporation quasi-bandpass sections into input/output terminals divider, whose quarter-wavelength-long transmission-line segments are reused as impedance inverters between stages. In this manner, bandpass-type transfer functions realized at output nodes along with power-distribution...

Normal realizations of bandstop resonators with finite unloaded Q suffer from degradation performance due dissipation loss. In this paper, it is shown theoretically that there exists a class second-order networks which simultaneously exhibit an ideal resonance, infinite stopband attenuation, and perfect match at all frequencies. Theoretical analysis backed up experimental results for three different physical realizations.

A new approach to designing absorptive microwave filters using allpass networks in a parallel-cascade configuration is presented. signal divided into two paths, each comprised of number cascaded networks. The signals are then recombined, and frequency selectivity results from phase cancellation. It shown that this especially useful for dissipative loss compensation. general method the given. Bandpass bandstop microstrip prototypes were designed, built, tested.

A class of tunable multi-band bandpass filters (BPFs) that is based on a quasi-bandpass topology presented. Unlike other approaches, it features quasi-elliptic-type filtering response with controllable passbands in terms center frequency and bandwidth. Additional transmission zeros (TZs) are produced through cross couplings introduced between adjacent sections their non-resonating nodes (NRNs). These TZs synchronously tuned passband reconfiguration. The lack direct interaction among the...

A simple planar circuit method has been applied for the first time to measure dielectric permittivity of solvents in trace amounts (0.3μl 5μl) at multiple frequencies. It shown that due high sensitivity device it can be used effectively characterize quantity dissolved impurities a given solution. For relative measurements square ring resonator prototype fabricated. Three have as standards seven unknowns 1GHz, 2GHz and 3GHz. The measured results show excellent agreement with theoretical. An...

In this article, it has been shown that under certain circumstances, i.e., in a receiver, is possible to allow microwave filters have significant passband insertion loss. Systems analysis of various receiver configurations shows acceptable noise figures and intercept points may be obtained receivers containing lossy filters, ones with low-Q resonators. Thus, the engineering problem how develop design techniques for resonators, but response terms selectivity pass-band flatness. A review...

A frequency-selective limiter that uses a linear-phase, contiguous-channel double multiplexer topology and RF-power-dependent coupling structures is shown in this paper. Frequency-selective limiting achieved without the use of magnetic materials, nonreciprocal components, or parametric circuits. An L-band prototype with six contiguous 50-MHz-bandwidth channels was fabricated. Under measured low-power excitation, has flat, composite passband 300-MHz-bandwidth 1.6-1.9 dB insertion loss. The...

A unique design approach for narrowband tunable bandpass filters is presented which focuses on engineering the tuned center-frequency dependence of coupling coefficient between adjacent resonators. New architectures are presented, and equations derived from energy expressions. microstrip prototype with independently-tunable center frequency bandwidth was built tested, exhibits excellent performance.

The DC and RF electronic behaviors of GeTe-based phase change material switches as a function temperature, from 25 K to 375 K, have been examined. In its polycrystalline (ON) state, GeTe behaved degenerate p-type semiconductor, exhibiting metal-like temperature dependence in the regime. This was consistent with state performance switch, which exhibited low resistance S-parameter characteristics. amorphous (OFF) presented significantly greater that varied considerably bias temperature. At...

The intention of this article is merely to provide the reader with some basic concepts that will enable them better make intelligent decisions when specifying filters. We restrict discussion most common type filter, bandpass filter. Bandpass filters are intended minimize signal attenuation in one band frequencies (the passband), while achieving a specified another stopband).

<?Pub Dtl=""?> This paper presents the theory, design, and implementation of a new class component called an intrinsically switched multiplexer, which is comprised number contiguous bandpass filter channels that can be independently on off with very low architecture-related insertion loss flat group delay across adjacent switched-on channels. Coupled-resonator topologies are identified allow for optimum performance channel filters through crossover frequencies, coupling section provides...

A new approach using dual-coupled-resonator bandstop sections to realize microwave filters with arbitrarily short through-line length is proposed. In contrast our recent work in 2015, this does not require the resonator-to-through-line couplings be comprised of both electric and magnetic coupling, i.e., mixed coupling. An exact transformation from a conventional inline filter topology presented. design procedure given for all-dual-coupled-resonator designs (single-coupled...

This paper presents a new tunable bandstop resonator architecture which allows for both center frequency and bandwidth tuning. It consists of varactor-loaded transmission line with odd symmetry about one axis coupled twice to through line. No tuning elements are placed in the signal path. is based upon recently developed proposed coupling topology [2] where determined not only from strength couplings but also electrical length associated Bandwidth achieved by differentially two varactors...

High-performance filters with electronically controlled transfer functions are needed for future microwave systems. In commercial applications, frequency agility is necessary to address ever-evolving standards and an increasingly congested spectrum, while military requirements include cosite interference mitigation broadband systems adjacent-channel simultaneous transmit receive. These will enable new system architectures, which will, in turn, allow improved performance capabilities. For...

Tunable high-Q intrinsically-switchable quasi-absorptive bandstop filters are presented in the 4 GHz to 6 and 6.3 11.4 frequency ranges. Their responses can be reconfigured between all pass tunable filter by simply tuning center of their resonators, avoiding insertion loss control voltages associated with series switches required conventional banks that have similar response reconfiguration capability. In contrast previously shown filters, this paper require only one element per resonator, a...

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...

The performance of conventional microwave filters is degraded when resonators with finite dissipation are used. This paper presents a new filter synthesis technique which allows for the realization lossy ideal lossless transmission and reflection responses, offset by constant amount. In contrast to existing loss-compensation approaches classical predistortion reflection-mode networks, this does not require non-reciprocal devices. Example circuit-based designs given as well microstrip...

A frequency-agile narrowband microstrip bandstop filter technology able to maintain near constant absolute bandwidth while tuning over a frequency range of nearly an octave is described. The demonstrated by reconfigurable notch designed selectively remove unwanted spectral content prior final amplification in transmitter's output module. six-resonator planar uses hyperabrupt GaAs varactor diodes tune the operating 92% range, from 480 MHz 925 MHz. maintains 3 MHz-wide stopband attenuation 34...

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...

A perforated ground plane is used to suppress the coupling between adjacent and intersecting transmission lines. Experimental results indicate 40-dB suppression of broadside two 50-/spl Omega/ new option in design circuit routing schemes proposed by demonstrating 28-dB reduction