In this paper, we present the modeling and experimental validation of an efficient, compact, high-isolation waveguide duplexer operating at 225 GHz. While duplexers based on ferrite circulators are key components many monostatic radar systems, W-band frequencies above performance rapidly deteriorates. The design presented here uses a ferrite-free duplexing concept transmitting receiving in orthogonal circular polarizations. polarization is efficiently generated using septum orthomode...

Waveguide antenna feeders with reconfigurable circular polarization sense are proposed in this paper. They can be switched between right and left hand polarization, without any mechanical rotation the feeder antenna. Two types of presented. The polarizer works a single switchable for each state. dual work both polarizations at same frequency band simultaneously, one associated different rectangular waveguide port. is controlled by metallic posts that block or open signal paths connecting...

In this letter, several bandpass filters operating in the WR-1.5 band (500 to 750 GHz) are presented. The deep reactive ion etching (DRIE) silicon micromachining process is used for fabrication of filters. Two canonical filter topologies based on E- and H-plane implemented. work presented here has two specific objectives: a) get important parameters, such as tolerances, vertical angles, surface roughness, repeatability b) validate proper working waveguide terahertz band. These do not have...

Orthomode transducers (OMTs) using folded six-port waveguide junctions are presented for obtaining the maximum compactness in antenna feeds with very wide performance. The proposed based on well-known turnstile and Bøifot configurations, having two symmetry planes keeping isolation between orthogonal polarizations control of higher order modes. arms provide a combined effect: good matching significant size reduction, especially transversal plane, reducing mass satellite systems allowing...

An analytical procedure is presented for the synthesis of generalized multi-band filters. The applicable to both symmetric and asymmetric frequency responses effective any number passbands stopbands. optimum equal-ripple performance obtained in each passband stopband. Prescribed real or complex transmission zeros can also be employed filtering function.

Novel combline resonators and filters with enhanced dual-band characteristics are introduced in this paper. The proposed resonator is made up of three metallic conductors: an inner post, intermediate conductor, enclosure. This structure provides two asynchronous resonant modes that can be used for realizing compact microwave filters. Such offer the low cost, size, ease manufacturing features traditional filters, additional size reduction due to fact a single physical cavity electrical...

In this paper, an orthomode transducer (OMT) for dual-band operation and optimized stacked micromachined layers implementation is presented. The proposed design avoids the use of septums, irises, pins, or small features minimizes number equal-thickness required. way, micromachining fabrication simplified, making a very attractive candidate high frequency applications low-cost batch production. A W-band (one different polarization in each band) with more than 10% fractional bandwidth band 30%...

A new physical realization of an elliptic function filter response is proposed for achieving compact size, wide bandwidth, spurious free stopband and high-selectivity performance. The configuration can be implemented in conventional waveguide technology or embedded a multilayer low-temperature co-fired ceramic structure integration with other circuitry chip module. analyzed using rigorous mode matching. To validate the concept, prototypes four- six-cavity filters are designed following...

A microstrip to empty rectangular waveguide transition is presented for systems requiring a simple modular assembly with good electrical performance. The structure based on three building blocks, involving line dielectric-loaded waveguide, between and waveguides reduced height, final transformer standard waveguide. These blocks (segmentation the design point of view) are combined in parts which assembled straightforward way, without soldering. features very important signal feeders large...

The design, method of fabrication and experimental validation a pseudo-elliptical four-poles asymmetric response filter at 100 GHz with 10% fractional bandwidth is presented. designed part an image radar system must fulfill stringent specifications. proposed topology improves the out band rejection above pass in comparison other classical structures, while keeping low insertion loss level. A two-fold geometry for implementing transmission zero proposed, avoiding excitation first higher order...

The design and experimental validation of a pseudo-elliptical response filter at W-Band is presented. A micromachining technique based on the thick SU-8 photo-resist used to construct filter. optimized structure specially well-suited for implementation filters with transmission zeros by means techniques, since extracted poles are implemented simple stubs without irises. Furthermore, novel topology use only three layers This new topology, which includes input/output routing, can be...

In this paper, we report the development of a wideband compact orthomode transducer (OMT) for 180-270 GHz band. The OMT design is based on classical high performance Bøifot waveguide junction and implemented in split-block using precision CNC milling. obtained results validate operation 40% fractional bandwidth constitute remarkable achievement at frequency

This paper presents the application of low cost additive manufacturing technique named fused filament fabrication (FFF) to implement waveguide devices. In addition reduced price, it also has added benefit rapid prototyping, allowing designer modify geometry swiftly. Otherwise this kind manufacture opens way experiment with shapes until now unachievable by traditional subtractive techniques. order demonstrate its feasibility, experimental results three filters low-pass, high-pass, and...

This paper presents, to the best of authors' knowledge, first realizations Gysel-type power combiner/divider in ridge waveguide technology with two different configurations. Gysel combiners exhibit wider bandwidths than traditional combiners, while offering compact designs when implemented waveguide, compared combiners. In addition, provide relaxed requirements on handling capability terminating loads case fault conditions, which may result from imbalance between inputs. The offer better...

In this paper, an extension to the extracted pole technique for synthesizing N-order filters with N-transmission zeros at real frequencies is presented. addition, a new bandpass rectangular waveguide H-plane low-cost configuration filter high-power low-loss application (patent pending) that implements filtering function finite frequency transmission proposed. This structure operates as resonant cavity in central of and simultaneously introduces controlled zero out bandpass. Since every...

The design and experimental validation of an ultra-wideband (UWB) filter in a low temperature co-fired ceramic (LTCC) is presented. bandpass uses ridge waveguide resonators realized LTCC by printing parallel planar conductors for the top bottom walls closely spaced metal filled vias lateral walls. Filter coupling scheme stripline transitions are developed UWB requirement. mode-matching method used their design. via effect measurement setup also addressed. Finally, results nine-order (design...

This letter provides an experimental demonstration of extraordinary transmission in a closed waveguide system loaded with electrically small diaphragm. is situation where the standard surface plasmon polariton (SPP) theory does not apply. The theoretical explanation then based on concept impedance matching. has previously been applied by some authors to account for enhanced situations can be used: periodic arrays holes or slits flat metal screens. experiment this supports matching model,...

In this letter, additive manufacturing technologies have been evaluated for waveguide antenna array prototyping at Ku band. Direct metal laser sintering (DMLS) and stereolithography assessed in terms of limitations, electrical performance, accuracy, cost weight, compared with traditional methods. This assessment is performed on a corporate-fed end-user digital broadcast satellite communications The objective to manufacture intricate multilayer structure as single block, order prevent contact...

A monopulse horn feed with a triple-radiation pattern (sum, elevation difference, and azimuthal difference) operating at 35 GHz is presented. The device consists of three main parts: spline profiled horn, mode converter that generates the modal field combinations produce each radiation pattern, very compact single-layer comparator network. Unlike other state-of-the-art designs, novel based on excited by network implemented in single level for improving compactness easing quasi-2-D...

A new compact multi-section structure for broadband waveguide polarization rotation is presented. The twist component based on cascading multiple steps with bow-tie shape geometry, which are progressively rotated between the input and output rectangular waveguides. twists show an excellent performance in full operating frequency band, controlled number of sections their shapes can be designed any angle. Moreover, very short easily manufactured, being well-suited satellite applications....

In this paper it is shown that the traditional shunt admittance represented by a rational function yields an accurate wideband equivalent circuit for multi-aperture waveguide irises. The electromagnetic analysis of structures reveals two different types resonant phenomena. first type resonance associated with cutoff frequency <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">${\rm TE}_{10}$</tex>...

An improved E -plane power divider for compact waveguide triplexers with large separation between channels is presented.The configuration of the aims to exploit different behavior device frequency bands separation, leading a very asymmetric junction.H filters inductive windows are used each channel, in order obtain reduced insertion losses and lower sensitivity than metal-insert filters.The resultant triplexer compact, its design analyzed optimized by Mode-Matching.The experimental results...

This paper presents a new concept for multiport waveguide switches based on short-circuit loads integrated in power-divider ridge-waveguide junctions. The switching is achieved by means of actuating short and open circuit the path ridge waveguide, eliminating need bulky rotors, which are typically used conventional switches. A complete class single-pole <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">N</i> -throw ( up to 4) presented this concept....