Bambang Setia Nugroho

Planar inverted-F antenna (PIFA) array with circular polarization for nano satellite application

In this paper, a new design of an S-band, self phased, planar inverted-F antenna (PIFA) is proposed for low orbit nano satellite application. The antenna consists of Four PIFAs which are arranged in circular array to generate circular polarization antenna. The antenna operates at 2.35 GHz with 107 MHz bandwidth of Return Loss less than -14 dB. Results show that the antenna has circular polarization properties with 1.21 dB axial ratio and unidirectional radiation pattern. Since the proposed antenna is compact and low cost, it is suitable for nano satellite communication system.

Dual polarized antenna decoupling for 60 GHz planar massive MIMO

Millimeter-wave (mm-Wave) Massive Multiple Input Multiple Output (MIMO) at 60 GHz is a candidate of advanced wireless communications for indoor environment. Mm-Wave massive MIMO antenna with lower frequency with sectoring technique has been proposed in previous research. Also dual polarized configuration for MIMO in lower frequency and lower number of antenna. Massive MIMO at 60 GHz mm-Wave is not evaluated yet in these previous research. In this paper, dual polarized mm-Wave massive MIMO has been proposed. Antennas are modeled in circular disk proximity coupled planar array. Bandwidth of dual polarized configuration is 4.349 GHz, wider than 4.303 GHz in single polarized configuration. Envelope Correlation Coefficient (ECC) of dual polarized configuration is 25 times lower compared to single polarized configuration. Dual polarized configuration shows better performance both in bandwidth and ECC compared to single polarized configuration.

Modeling of massive MIMO transceiver antenna for full-duplex single-channel system (in case of self interference effect)

Massive MIMO technology can increase capacity, data rate, and link reliability significantly without additional bandwidth or transmission power. Most of the previous study on Massive MIMO systems are using low frequency (2.6 GHz). This frequency is not suitable for future broadband technology, because IoT devices will use high frequency and possible cell coverage would be smaller. This work proposes Massive MIMO transceiver antenna that can be implemented in high frequency (60 GHz). This system provides broadband wireless communication which gives high capacity, high data rate and wide bandwidth. In this works the number of antennas is 64×64. Antennas can be set adaptively to capacity. In this case all of the antennas as a receiver are functioned to get redundancies and 32 antennas as transmitter adjusted to the required capacity. Configuration of antenna has been set to eliminate the mutual coupling effect. The system utilizes full duplex single channel (FDSC) which use the same frequency and time to transmit and receive data. In FDSC, bandwidth can be minimized, but self interference effect appeared and disturbing the system performance of Massive MIMO. The effect of self interference for Massive MIMO transceiver antenna simulated from 10% to 100%. The proposed system provides the channel capacity ≈ 390 bits/s/Hz or ≈ 39× spectral efficiency of SISO system. The simulation result shows that mutual coupling effect ≈ 0. The Massive MIMO have a tolerance of 20% self interference effect, however it could decrease 20% channel capacity as well.

Wideband parasitic antennas design and realization to improve laptop antenna reception

In laptop antenna reception, the received signal frequently experience significant decrease when laptop antenna is located on a deep fading position in multipath environments. In this paper, we propose a method of using parasitic elements to improve the reception of laptop antenna, which can be incorporated (pasted) at the back panel of laptop screen. The proposed antennas have a wide frequency band, ranges from 2265 MHz to 6233 MHz, to serve all frequencies in WLAN operation. The proposed parasitic antennas exhibit the gain improvement of 1.21 dB at low frequency band (2392.5 MHz) and 2.68 dB at high frequency band (5567.5 MHz). These antennas are able to cover all frequencies in the 2.4 GHz band and the 5.2 / 5.8 GHz band for WLAN systems.