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A non-uniform C-section phaser is introduced as a powerful approach to enhance the design flexibility of uniform phasers. Moreover, an efficient synthesis technique is provided to design such phasers. Two design examples are presented. The first example is a single non-uniform C-section phaser. The second one is a cascaded double non-uniform C-section phaser featuring larger group delay swing and...
This paper presents a novel design of negative group delay circuit (NGDC) with very low signal attenuation (SA) and multiple-poles in group delay (GD) characteristics. The very low SA is obtained due to high characteristics of coupled lines. Theoretical analysis shows that the multiple-poles in GD characteristics can provide wider negative GD bandwidth and be obtained by connecting coupled lines resonators...
This paper presents the designs of monolithic left-handed coupled lines to achieve the coupling bandwidth exceeding 213 GHz. The interwoven-capacitor and the stacking-inductor are applied to achieve lower cut-off frequency of left-handed transmission line without sacrificing the size of the unit cell. The complex propagation constant of the single transmission line is extracted from two-port scattering...
This paper presents a novel structure for ultra broadband 4∶1 broadside-coupled PCB impedance transformer. Analysis, simulations and measurements of the developed transformer are introduced and discussed. Three prototypes of the proposed structure are implemented at center frequencies 5.65 GHz, 4.35 GHz and 3.65 GHz, respectively with fractional bandwidth of greater than 180 %. The implemented transformers...
Multi-band antennas are increasingly deployed in wireless systems (e.g., cellular base stations) utilizing multiple dissimilar radiators with separate feed networks for each band. A major difficulty in such design is to control the isolation between bands, and often the elements are widely separated in space, for example, by allocating the antennas for each frequency band to a separate dielectric...
A novel design of millimeter-wave antennas integrated with a high-impedance surface (HIS) reflector is presented within the particular context of 3D heterogeneous integration on silicon interposer an its specific requirements. Then, the design steps of a 60-GHz folded dipole antenna for short-range communications are detailed. Simulation and measurement results show promising performances in terms...
Cooperative spectrum sensing in cognitive radio (CR) avoids hidden terminal problems common to network architectures with central sensing nodes. It also lowers the requirements for the sensing radio front-ends. This paper presents a multi-chip module RF front-end implemented from custom RFICs realized in an 0.25 µm SiGe BiCMOS technology. Using an up/down-conversion heterodyne architecture, the front-end...
A novel wideband balanced power dividing/combining network is proposed in this paper. Based on matrix transformation, the differential mode and common mode equivalent circuits of the wideband balanced network can be easily deduced. A planar wideband balanced network with bandwidths of 55.3% (|Sdd21, 31| < 4 dB) for the differential mode with wideband common mode suppression is designed and fabricated...
A high ratio Wilkinson power divider is produced by cascading low ratio dividers. Combining two 1∶2 and one 1∶3 divider results in a 1∶8 ratio. Theoretically the 1∶8 divider has an S21 of −0.51dB and an S31 of −9.54dB. Under simulation the average S21 over a 1.7–2.7GHz band was −0.7dB and the S31 −10.3dB. A prototype was built on standard 1.6mm FR4 substrate. The 1∶3 divider uses stacked substrates...
In this paper, a novel 180° coupler is proposed. The proposed hybrid uses the input port of an ultra wide band Wilkinson power divider as the summation port and replaces the resistor by an additional fourth port having the same characteristic impedance; this port will act as the difference port. The design of the proposed hybrid is developed using microstrip line and slot line, hence avoiding any...
Vialess shielded composite right/left-handed (CRLH) stripline is proposed. The structure preserves the CRLH properties while preventing undesired radiations and minimizing electromagnetic interference (EMI) coupling from the surrounding noisy environments. The vialess topology also allows a simple realization option. As an application example, a 3-dB directional coupler and a novel broadband tunable...
A simple and efficient design method for tunable filters on lumped elements is presented. The method allows designing bandpass filters with tunable central frequency and constant absolute bandwidth. The filter circuit consisting of series LC-tanks and impedance inverters is used in contrast to the conventional approach. Theoretical restrictions of the method as well as practical factors limiting its...
This paper presents a novel type of tunable band-pass filters with constant bandwidth and wide tuning range. A constant absolute pass-band has been obtained by integrating a low-pass filter at the input and the output of the filter. The filter fabricated on duroid substrate can be tuned from 690MHz up to 1130MHz, by using RF-MEMS switches mounted in series with fixed capacitors. Matching is better...
A novel polarization rotation surface based on artificial magnetic conductor structure (AMC) is proposed, which can reflect incident wave in orthogonal polarization state and simultaneously offer a 90° phase difference. The feature is theoretically analyzed and validated. By using the proposed polarization rotation AMC, right-handed circular polarization is achieved for a linearly polarized dipole...
The design and experimental validation of a dual-band array antenna concept is presented. The antenna supports quasi-magneto-electric radiation characteristics which simultaneously utilizes both the electric and magnetic radiation characteristics in the overall radiation mechanism. A prototype of the antenna has been manufactured and the demonstrated performances include dual-band operation with large...
Due to the increasing demand of high data throughput and compact size of wireless communication devices, miniaturized multiple-input-multiple-output (MIMO) antennas are highly desirable. In addition, multiband operation is highly desirable for multitasking and covering different wireless standards. This paper presents a two element semi-ring multiband compact MIMO antenna having a total size of 32×42×1...
Patch sharing technique, to the best of the authors' knowledge, is the first time proposed in the application of patch antenna array arrangement. With this approach, the distance between antenna unit cell can be decreased significantly, which the inter-element distance is assumed as a key parameter for beam forming and to control sidelobe level of antenna array. However, most of the time this distance...
This paper evaluates a liability in use of modulated signal for microwave wireless power transmission. A microwave rectifier is designed and fabricated for the evaluation process. In design, inverse Class-F theory has been applied. Rectifier's RF/DC conversion efficiency is set as a Figure Of Merit (FOM). This FOM is acquired for different modulation type and bandwidth, in condition of equivalent...
In this article the design and the construction of an ultrawideband (UWB) 3 dB hybrid coupler are presented. The coupler is realized in broadside stripline technology to cover the operating bandwidth 0.5 – 18 GHz (more than five octaves). Detailed electromagnetic design has been carried to optimize performances according to bandwidth. The comparison between simulations and measurements validated the...
This paper describes a new pseudo-elliptic structure that has the same number of transmission zeros as comparable Cauer filters. The filter differs from previous structures in that it has two three-section stepped stubs which contribute an additional transmission zero, ensuring even better performance and substantially increased range of realizable stopband attenuation levels.
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