Figure 6 Cutoff frequency f and maximum frequency f as T max a function of drain source bias of 1.25 = 90 m 2 double-heterojunction PHEMT device In summary, we have presented the design and performance of double-heterojunction PHEMTs for linear power applications. The dc and RF results indicate tha
Broadband circularly polarized microstrip antenna with a chip-resistor loading
β Scribed by Kin-Lu Wong; Gui-Bin Hsieh
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 159 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0895-2477
No coin nor oath required. For personal study only.
β¦ Synopsis
Simply by loading the microstrip antenna at a suitable ( ) position using a single chip resistor, circular polarization CP radiation can be obtained with a single feed. In addition, this design can also pro¨ide an enhanced CP bandwidth. Results of the proposed CP design applied to circular and rectangular microstrip antennas are presented and discussed.
π SIMILAR VOLUMES
The characteristics of a slot-coupled circular microstrip antenna with chip-resistor and chip-capacitor loadings are studied. With a chip-resistor loading, a significant decrease in the resonant frequency of the microstrip antenna is achie¨ed, which can result in a large antenna size reduction, and
Figure 4 Signal gain and noise figure as a function of laser wavelength The effects of the laser wavelength on the probe signal at s 1550 nm are given in Figure 4. As mentioned earlier, s the presence of an oscillating laser signal within the wavelength range of 1528α1533 nm reduces the upper level
A circularly polarized antenna, realized in a low-cost technology with an integrated feed, is presented for the land-mobile satellite seruice. This antenna presents large bandwidth, high gain, and good axial ratio in all frequency ranges.
## A new and simple technique for obtaining circular polar-( ) ization CP radiation of a single-feed microstrip antenna is demonstrated. This CP design is achie¨ed by insetting a single slit to the boundary of the microstrip patch, and placing a single feed along an axis 45Рto the one containing
A no¨el dual-feeding technique for a broadband circularly polarized aperture-coupled microstrip antenna operating in a 2.45 GHz system is presented. The dual feeds are placed in orthogonal directions, and are connected to a Wilkinson power di¨ider with a 90Рphase shift between its two output feedli