Active integration ring antenna∕phase shifter for direct conversions

Liu, J.-C.; Cheng, Ching-Chien; Chen, H.-C.; Chen, P.-C.

doi:10.1049/ip-map:20040507

Cited by 7 publications

(6 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the abovementioned techniques of direct conversion AIA [4][5][6][7][8], the necessary phase shifters are generally constructed by using the phasedelay line. The phases of 45°or 90°are dependent on the length of the 50⍀ lines.…”

Section: Microstrip Ring Phase Shiftermentioning

confidence: 99%

“…For the ring resonator, it is easy and feasible to determine the needed phases of 45°, 90°, or others by using the mode chart. According to the TM 110 configuration shown in Figure 3(a) from the mode chart in [8], it is found that the maximum voltages occur at 0°and 180°; in contrast, the maximum currents occur at the places of 90°and 270°. For the TM 210 configuration shown in Figure 3(b), the maximum voltages occur at 0°, 90°, 180°, and 270°, and the maximum currents occur at 45°, 135°, 225°, and 315°.…”

Section: Microstrip Ring Phase Shiftermentioning

confidence: 99%

“…The direct-conversion receiver constructed with an antenna low-noise amplifier (LNA), a local oscillator (LO), a mixer, a phase shifter, and filters is shown in Figure 1. Therefore, it has the advantages of compact size, simple circuits, and low cost and it can be realized in an active integration antenna (AIA) [2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Active integration ring antenna/phase shifter with annular ring slot for 5-GHZ WLAN direct conversions

Liu

Soong

Chang

et al. 2005

Microw. Opt. Technol. Lett.

View full text Add to dashboard Cite

A compact active ring antenna integrated for direct conversion or zero‐IF detection is presented in this paper. The ring antenna with annular ring slot exhibits wide‐bandwidth and high‐gain performances. Meanwhile, the ring acting as a phase shifter provides the necessary 90° characteristics to operate with I/Q signals for direct conversions. Two Schottky diodes are connected to the ring structure and used as the mixer. Conversion gain Giso = 4.2 dB. The work is the case at 5.0 GHz for WLAN applications. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 47: 475–480, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21205

show abstract

Section: Microstrip Ring Phase Shiftermentioning

confidence: 99%

Section: Microstrip Ring Phase Shiftermentioning

confidence: 99%

See 1 more Smart Citation

Active integration ring antenna/phase shifter with annular ring slot for 5-GHZ WLAN direct conversions

Liu

Soong

Chang

et al. 2005

Microw. Opt. Technol. Lett.

View full text Add to dashboard Cite

show abstract

“…It is a well‐known fact that active feedback presents really appealing physical features, such as simple structure, small size, and low cost. Because of all these interesting characteristics, Multi‐band low noise amplifier is expected to become a key device for the next generation multi‐band and multi‐mode wireless radios , and growing research activity is being focused on them . Various switching based techniques have been proposed to achieve multi‐band performance.…”

Section: Introductionmentioning

confidence: 99%

“…Various switching based techniques have been proposed to achieve multi‐band performance. Some of the topologies use separate oscillators to obtain multi‐band response while others use distinct resonators or matching networks to achieve the same. An alternative switched resonator technique is discussed, wherein, low noise amplifier is controlled by modifying microstrip line matching network length using a diode based electrical switch.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable active integrated antenna with log‐periodic matching network structures and reduced PIN diodes for WLAN/WiMAX applications

Mazloum

2016

Micro & Optical Tech Letters

View full text Add to dashboard Cite

In Figure 7, the simulated results using HFSS [15] and measured results show that a bandwidth from 2.4 to 11.0 GHz with S 11 < 210 dB, S 12 < 215 dB wholly, is achieved. The comparison in Table 1 shows the superiority, e.g. a smaller size, a wider band, an all-band higher isolation. The corresponding envelope correlation coefficient ECC calculated from far-field radiation patterns [8] is below 0.02 in Figure 8, ensuring good diversity performances. In Table 2 the calculated result can satisfy mean effective gain MEG 1 /MEG 2 3 dB and diversity gain DG is more than 9.4 dB and diversity gain EDG is more than 8.4 dB [6]. Gain variation in Figure 9 is below 3.5 dB [5] and efficiencies are above 70% [9] with scarcely any influence of adding the stepped ground stub. The field patterns at 2.4, 5.2, and 7.8 GHz in Figure 10 shows good agreements. The patterns are nearly omni-directional in the Y-Z plane [10]. CONCLUSIONIn this paper, a Bluetooth-UWB MIMO antenna with a compact size of 40 3 36 mm 2 is proposed. It covers multibands of the Bluetooth (2.4-2.484 GHz), WiMAX (3.4-3.69 GHz), WLAN (5.15-5.825 GHz), and UWB (3.1-10.6 GHz) bands. A stepped ground stub protrudes vertically to enhancing the isolation. A rectangular slot and a triangular trim on the planar polygon monopole element and two rounded corners on the ground are jointly used for improving the impedance matching. Meanwhile, it achieves good diversity performances. Hence, results show that our proposed Bluetooth-UWB MIMO antenna has a small size, a wide band and a high isolation at full frequency. So it is promising for various wireless device applications.ABSTRACT:: A novel reconfigurable active integrated antenna for WiMAX/WLAN applications is presented. By using a radiating patch with a pair of folded microstrip arms in the active feedback antenna two new resonances can be achieved. Also a novel reconfigurable low noise ABSTRACT:: The design of a circular polarization (CP) reconfigurable monopole antenna with enhanced boresight gain for the Global Navigation Satellite System (GNSS) is presented. The antenna is composed of two meandered monopoles perpendicular to each other, a switchable feeding network and a metallic reflector. The switchable feeding network consists of a Wilkinson power divider, a 908-phase shifter, a double-pole double-throw (DPDT) switch, and a defected ground structure (DGS). The power divider divides the input signal into two signals with equal amplitude and 908-phase difference. The two signals arrived at the two monopoles have a phase difference of 908 or 2908, determined by two DC voltage inputs to the DPDT switch hence to generate a right-or left-handed CP signal. Compared with the previous work, the antenna requires only two control DC voltages and so is much simpler. Measured results show that the metallic reflector placed at the back of the antenna increases the boresight gain by 5 dBi. The measured impedance bandwidth (S11< 210 dB) and axial-ratio bandwidth (AR< 3 dB) are from 1.28 to 1.97 GHz and 1.44 to 1.85 GHz, respective...

show abstract

T-coupled circular microstrip antenna with H-shaped aperture for active reflect-antenna applications

Liu

Chiang

Soong

et al. 2005

Microw. Opt. Technol. Lett.

View full text Add to dashboard Cite

The novel design of a T‐coupled circular microstrip antenna with H‐shaped aperture for active reflectantenna application is presented in this paper. The circular patch determines the frequency resonated; the H‐shaped aperture is used to obtain the responses of the desired 2.4–2.48 GHz ISM band and the T‐coupled feed line enhances the response of the band using the impedance‐matching technique. Meanwhile, the dual‐polarized ports of the T‐coupled microstrip antenna are developed for the active reflectantenna and applied to a corner‐wall structure. The antenna is capable of achieving high‐directivity gain, wide bandwidth, high isolation, and low cross‐polarization levels. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 46: 120–125, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20919

show abstract

Active integration ring antenna∕phase shifter for direct conversions

Cited by 7 publications

References 7 publications

Active integration ring antenna/phase shifter with annular ring slot for 5-GHZ WLAN direct conversions

Active integration ring antenna/phase shifter with annular ring slot for 5-GHZ WLAN direct conversions

Reconfigurable active integrated antenna with log‐periodic matching network structures and reduced PIN diodes for WLAN/WiMAX applications

T-coupled circular microstrip antenna with H-shaped aperture for active reflect-antenna applications

Contact Info

Product

Resources

About