Rectangular Active Microstrip Patch Antennas Revisited

Biswas²,

Bose³

2012

PIER Letters

A Gunn mounted active microstrip slot-ring antenna (ASRA) has been investigated for the reception of FM microwave signal. Current well/valley phenomenon has been successfully utilized to demodulate the modulation information. The monolithic behaviour of an active slot-ring antenna as a lock-in amplifier, FM (Frequency Modulation) to AM (Amplitude Modulation) converter and square law detector has been demonstrated in this paper. Theoretical analysis coupled with experimental results has been presented. The proposed receiving scheme is unique in the sense that it does not require IF electronics for the purpose of demodulation. It also works well in a multi-channel environment due to the excellent noise-squelching property of an Injection Locked Gunn Oscillator.

Section: Resultsmentioning

confidence: 93%

Section: Theoretical Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Active Slot-Ring Antennas as a Receivers

Biswas²,

Bose³

2012

PIER Letters

“…A large number of such active antenna elements are integrated to perform the function of both transmission and reception. A huge number of experiments/studies [5,6] have been made about the radiation performance of an antenna (slot and patch both) though studies on its reception performance are really a few. Some of them are operated in self-http://www.ispacs.com/journals/acte/2013/acte-00138/ International Scientific Publications and Consulting Services mixing receiving mode and proposed for signal detection.…”

Section: Introductionmentioning

confidence: 99%

“…Recently self mixing Gunn mounted active antennas have been reported [3,4] at L-band for a half duplex communication system and at X-band for transceiver and spatial power combining applications. An active antenna is basically an oscillator and then a radiator, its device characteristic under injection locked condition shows an interesting modification [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. In this paper, a detailed comparative study in case of reception of a FM signal between active microstrip patch antenna (AMPA) and active microstrip slotted ring antenna (ASRA) has been discussed.…”

Section: Introductionmentioning

confidence: 99%

Comparison on the Reception Property of Gunn Mounted ASRA and AMPA

Advanced Computational Techniques in Electromagnetics

Biswas²

2013

A Gunn mounted active microstrip patch antenna (AMPA) and active microstrip slot antenna (ASRA) has been investigated for the reception of FM microwave signal. Current well/valley phenomenon has been successfully utilized to demodulate the modulation information. Reception poperty of the both antennas are studied in multi-channel environment. Because of its simple circuit configuration and similarity in transmitter and receiver architecture, active patch antenna as demonstrated is well suited for commercial and military application as a two-way microwave communication system. A comparative study on the role of AMPA and ASRA as a receiver shows that ASRA do better performances than AMPA. In case of ASRA the modulating signal are demodulated without any distortion. ASRA also has large locking range (29 MHz) compare to AMPA (5 MHz). So the ASRA has broad band tuning capabilities than AMPA. With ASRA configuration demodulation bandwidth in excess of 14 MHz is realizable which can successfully accommodate a large number of voice or data channels.

Gunn-mounted active microstrip rectangular patch antenna – revisited

Int. J. Microw. Wireless Technol.

Pal

Bhattacharaya

et al. 2013

The microstrip active patch antenna behaves like a resonant circuit/cavity with multiple resonant frequencies; furthermore, depending on the non-linearity of the device, it generates significant amount of second harmonic radiation. The location of the device on the patch that maximizes the fundamental radiated power output is found to be not the position corresponding to the minimum second harmonic content in radiated power. An optimum location of the diode on the patch has been suggested. The paper also discusses the modification of the behavior of the active antenna, which is first an oscillator; and then a radiator, under injection-locked condition. The results are presented with respect to a Gunn-mounted rectangular patch.