This paper reports a new circularly polarized rectenna whose rectifying circuit includes two diodes. The consists of coplanar stripline (CPS) truncated patch antenna and CPS bandpass filter, which can block harmonic signals up to the third order reradiating from circuit. is printed on Rogers Duroid 5880 substrate with /spl epsiv//sub r/=2.2 thickness 20 mil. dual-diode provide at least twice dc output voltage than traditional only single diode, has same layout dimension as single-diode...

Microstrip reflectarray antennas present an alternative to conventional directive in that they are flat, inexpensive, easy install and manufacture, conformal the mounting surface, package, possess high power beam steering capabilities. For first time, a comprehensive, experimentally verified design procedure for microstrip is presented. In this procedure, has been shown be effective linear array capable of switching dual polarization. The also allows fed from feed-horn offset at any given...

This letter presents a novel ultra-wideband (UWB) bandpass filter (BPF) with notched band using ring resonator. Bandwidths of the resonator two stepped-impedance stubs are calculated by examining relations between resonant frequencies and characteristic impedance ring. Stepped-impedance ports used to obtain improved return losses in high-frequency band. Interdigital-coupled feed lines an asymmetric structure embedded developed avoid wireless local-area network (WLAN) signals at 5 GHz...

Novel uniplanar 180 degrees and 190 hybrids suitable for MIC MMIC applications are described. The crossover hybrid-ring coupler using a coplanar waveguide (CPW) slotline provides substantially improved amplitude phase characteristics over broad bandwidth compared to conventional microstrip couplers. Experimental results show that the new has of more than one octave from 2 GHz 4 with +or-0.4-dB power dividing balance +or-1 balance. A two-branch directional coupled rectangular ring also been...

Equivalent circuits have been derived for microstrip ring and varactor-tuned resonators. It was found that the resonant frequency is slightly lower as coupling gap becomes smaller. Varactor-tuned resonators developed with up to 15 percent tuning bandwidth using packaged varactor diodes. A dielectrically loaded circuit loss demonstrated. The results should many applications in electronically tunable oscillators filters both hybrid monolithic integrated circuits.

Transmission Lines and Waveguides. S Parameters Circuit Representations. Review of Semiconductor Physics. Varactor Devices Circuits. Detector Mixed Receiver Noise Figure Dynamic Range. p-i-n Diodes Control Devices. Oscillator Amplifier Circuits Using Two-Terminal Transferred Electron IMPATT Field-Effect Transistors. Bipolar Transistors, HEMTs, HBTs. Transistor Amplifiers. Oscillators. Mixers, Switches, Phase Shifters, Multipliers. Appendices.

A transmission-line model is used to extract the equivalent lumped-element circuits for closed- and open-loop ring resonators. The unloaded Q values of resonators can be calculated from lumped elements G, L, C. Four different configurations microstrip fabricated on low high dielectric-constant substrates are investigate Qs. largest difference between measured 5.7%, which due measurement uncertainties accuracies calculation. These simple expressions introduce an easy method analyzing in...

A dual-frequency polarization diversity antenna is present for multiple-input-multiple-output (MIMO) systems. The proposed produces horizontally polarized omnidirectional radiation fields caused by constant current distribution on its wing structures. measured return losses of 18 and 19 dB are achieved at 2.45 3.9 GHz, respectively. patterns dual-band MIMO systems other wireless communication applications.

This letter presents novel bandpass filters (BPFs) with a wide stopband using asymmetric stepped-impedance resonators (SIRs). An uncoupled section located within conventional coupled lines functions as means of achieving additional transmission zeros between each existing zeros, created by the lines. Designing two types resonators, which have same fundamental resonant frequency <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML"...

This paper reports a right-hand circularly polarized (RHCP) high-efficiency traveling-wave rectifying antenna (rectenna) designed in coplanar stripline (CPS) circuit that is etched on Rogers Duroid 5870 substrate with /spl epsiv//sub r/=2.2 and 20-mil thickness. A 4 times/ 1 array of RHCP high-gain dual-rhombic-loop antennas (DRLAs) reflecting plane are used to provide highly efficient RF-to-DC conversion the presence lower power densities regardless rectenna's broadside orientation. The...

This letter presents a miniaturized dual-mode microstrip bandpass filter with the right crossed slots. The slots perturb and reduce fundamental resonant frequency, but second resonance is not affected. Therefore, will be effectively higher than 2f/sub o/, where f/sub o/ frequency. Since frequency lower, smaller conventional filter. proposed shows 4.4% fractional bandwidth at 1.595GHz return loss of better 10dB an insertion less 2.5dB, while passband located around 2.88f/sub o/= 4.6GHz....

This paper reports a new circularly polarized (CP) high-gain, high-efficiency rectifying antenna (rectenna) array designed in coplanar stripline (CPS) circuit. The can maintain constant dc output voltage regardless of its broadside orientation. is etched on Rogers Duroid 5870 substrate with /spl epsiv//sub r/=2.33 and 10 mil thickness. High-gain dual rhombic loop antennas reflecting plane are used order to reduce the total number rectenna elements necessary cover fixed area. Each has CP gain...

A six-channel multiplexer composed of parallel-coupled microstrip bandpass filters is developed. The passbands the filters, i.e., channel frequencies, are 10, 12, 19, 21, 32, and 35 GHz. operating frequency range so wide that a new method harmonic suppression devised for designed at 10 12 simple does not require any change to conventional filter. design procedure then introduced with rule set up initial conditions better optimization. need tuning elements, measurement results show insertion...

New reduced-size uniplanar magic-T and hybrid-ring coupler suitable for MIC's MMIC's have been developed using a CPW-slotline ring that is 20% smaller than comparable designs. These circuits provide good amplitude phase characteristics over broad bandwidth. Experimental results show the has 1.3 octave bandwidth centered at 4 GHz of 1.6 from 2-6 GHz. Both maximum power dividing imbalance 0.4 dB 2.5/spl deg/ imbalance. Also new de Ronde's CPW-slot directional was with performance. The even-odd...

This paper presents a new time-delay phase shifter using piezoelectric transducer (PET) on microstrip line with computational and experimental results. Dielectric perturbation changes the capacitance propagation constant of line. The is varied, but insertion loss not much affected. A maximum shift 460/spl deg/ respect to unperturbed condition has been achieved an increased less than 2 dB total 4 up 40 GHz, dielectric controlled by PET. proposed should have many applications in antenna beam...

Wave PhotodetectorsH. F. Taylor, 0. Eknoyan, C. S. Park,K. N. Choi, and K. ChangDepartment of Electrical EngineeringTexas A&M UniversityCollege Station, Texas 77843ABSTRACTDesigns for traveling wave photodetectors in semiconductormaterials are presented, advantages over conventionalphotodetectors discussed.

Broad-band integrated circuit mixers rising a crossbar suspended stripline configuration and finline were developed with GaAs beamlead diodes. For the balanced mixer, less than 7.5-dB conversion loss for 15-GHz instantaneous, IF bandwidth was achieved LO at 75 GHz RF swept from 76 to 91 GHz. With 90 GHz, of 7.8 dB over 14-GHz instantaneous as is 92 105 8 12 32-GHz 108 Integrated building blocks, such filters, broadside couplers, matching circuits, varions transitions, also developed.

The design and measurement is described of a compact (59.94 mm × 59.94 1.14 mm) bidirectional ultrawideband modified equiangular spiral antenna with an integrated feed internally matched to 50-Ohm microstrip transmission line. An transition from parallel-strip line soldered short (1.14 twin-line feeds the spiral. currents on travel in direction approximately perpendicular at points where passes close proximity (0.57 mm). Holes were etched metal arms reduce impedance mismatch caused by...

The information on downward longwave (LW) radiation is necessary for the design of passive cooling system buildings. Because measured LW data are not available in most locations, few studies have focused modeling China. In this study, empirical models estimating were proposed under all-sky conditions based meteorological parameters such as ambient dry-bulb temperature, water vapor pressure, and relative humidity, which can be classified into four cases: All day, nighttime, daytimes with...

This paper presents the analysis and design of aperture-coupled microstrip patch antennas arrays fed by an dielectric image line. A theory based on cavity model antenna change in modal voltage line at aperture was developed to analyze single element antenna. The combined with array linear traveling wave X-band Ka-band frequencies. required taper excitations individual patches achieved varying dimensions. Experiments show very good results for arrays.