Abstract: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 prop… Show more
“…Detection of an information signal in the presence of co-channel interference has been performed in this section. Injection-locking technique is efficient to demodulate the signal [22]. Fig.…”
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.
“…Detection of an information signal in the presence of co-channel interference has been performed in this section. Injection-locking technique is efficient to demodulate the signal [22]. Fig.…”
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.
“…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%
“…Conventional Discriminator output also studied here. Over the lock band AMPA and ASRA exhibits the phenomenon of FM-AM conversion [13,18,[21][22][23]. This results in a lock-in FM detector, where both the functions of FM-AM conversion and square law detection are combined.…”
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.
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