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With the rapid increase in the scale and complexity of circuits and systems, the storage of large amounts of output bit stream, which is the sequence of 0s and 1s, has become a severe problem. As the cost of data storage is high, typically for FPGA reconfiguration stream, a particular compression algorithm needs to be introduced to minimize the data size. However, current compression schemes either...
Bit-stream compression is very important in communication, data transmission and many other areas. The improvements to the compression ratio can save the storage space and transmission time, therefore, reduce the hardware's scale. However, traditional single compression algorithms such as run-length encoding and dictionary-based compression are just suitable for some specific bit-streams, for other...
This paper provides a ground plane solution for the fractal-shaped reconfigurable dual-band slot-ring antenna by using the Electromagnetic Band-Gap (EBG) surfaces. The EBG surface is designed with an in-phase bandwidth from 1.7 to 3.0 GHz. A distance between the EBG and the antenna is selected to be 7. 5 mm. The EBG-backed reconfigurable slot-ring antenna operates at two frequency bands based on the...
This paper presents a continuously-tunable single-polarized slot-ring antenna operating at S band. The frequency tunability is achieved by loading the slot-ring antenna with varactors. By properly designing the feeding network and biasing circuits, the slot-ring antenna is able to cover 2–4 GHz. A prototype antenna was fabricated and measured. The measured return loss is better than 9 dB from 2.66...
A reconfigurable single slot-ring antenna is able to switch between S and C bands using PIN diode switches. However, the fractional bandwidth of this single slot-ring antenna at lower band is narrow (11.4%). In this paper, four additional slots are added to form a double slot-ring antenna at the lower band. As a result, the antenna fractional bandwidth at the lower band is significantly enhanced from...
In general, the radiation pattern of an antenna array can be predicted by the array factor and the radiation pattern of the array element. However, the radiation pattern of a reconfigurable slot-ring antenna varies with ground plane size. To explore the reconfigurable slot-ring antenna array performance, the effects of the ground plane size on radiation pattern of the reconfigurable slot-ring antenna...
A novel design of frequency reconfigurable slot-ring antenna is proposed. The reconfigurability is achieved by using PIN diode switches across each slot. Two operating states are defined based on different states of the switches (ON or OFF). Separate microstrip feed lines are used to excite the antenna at lower (2.23GHz) and higher (6.81 GHz) frequency bands and two via holes are etched away near...
The effect of PIN diode switches on the performance of reconfigurable slot-ring antenna is studied and presented. An equivalent circuit is used to model the ON and OFF states of the switches in the antenna structure. Two different antennas with ideal switches and real switches are fabricated and measured. Measured results show that the PIN diode switches have some loading effects on the antenna. Parametric...
An electrically tunable planar hairpin filter integrated with a microstrip patch antenna is proposed in this paper. The patch antenna is integrated as a resonator, contributing to a second-order filter. The integration is performed to eliminate 50-ohm transition losses and reduce the overall structure size. The antenna is magnetically coupled to the hairpin resonator and operates at a center frequency...
A circularly-polarized (CP) filter/antenna system is presented herein. The filter/antenna system is formed by a cavity resonator and a single-fed corner-truncated patch antenna. The corner-truncated patch works as both a resonator of the cavity filter and a CP radiating element. By vertically integrating the CP patch antenna with the cavity resonator, a second-order filtering response is obtained...
For microstrip patch phased arrays, larger fractional bandwidth (FBW) and wider scan angle are challenging to achieve at the same time. Phased arrays on thin substrates typically can scan to large angles due to the reduction of mutual coupling caused by surface waves. However, thin substrates limit the achievable FBW of the phased array antenna. In this paper, an integrated filter/patch technology...
An evanescent-mode cavity filter integrated with a slot antenna is presented herein. Evanescent-mode cavities are commonly used to design low-loss filters due to their high quality (Q) factors and small size. The integration of the slot antenna and evanescent-mode filter provides nearly-zero transition loss with reduced size. The filter/antenna is designed at the center frequency of 8.56 GHz with...
With the advent of the knowledge-based economy, the enterprise's management philosophy advances with the times as the environment constantly changes. As market competition continues to intensify, marketing activities are enlarging and customer demand is increasingly growing and diversifying. More and more enterprises have empowered their own front-line salespeople. And managers in enterprises are...
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