حدیثِ لولاک کا تحقیقی و تجزیاتی مطالعہ A Research Review of the Hadith e Lawlāk

The importance and authenticity of the hadiths of the Prophet (PBUH) in the Muhammadan Ummah is an undisputed fact. A large number of Muḥaddithīn and imams spent their lives in collecting and editing the hadiths of the Prophet (PBUH) and compiled a collection of hadiths. These hadiths were classified according to their health and weakness. Due to the efforts of the imams, there are hadiths narrated from the Messenger of Allah on all sciences and knowledge and issues and rulings. Among them are Hadith Qudsī, Ma‘rūf, Mawkūf, Maktū‘, Saḥiḥ, Ḥasan Za‘īf and all other types of Hadith. The same Hadith e Qudsīyyah also includes a Hadith Lawlāk "لولاک" refers to those hadiths in which the Prophet ﷺ has been described as the cause of the creation of the universe and the origin of the universe. That is the hadith in which Allah Almighty has related the Prophet (PBUH) as the reason for creating the universe and its beings. However, the words of "Hadith e Lawlāk" The authenticity of the hadith has been made a subject of discussion. Some imams have declared this hadith to be weak and some have also said that it is valid. However, a large number of scholars have agreed on the authenticity of this hadith and the hadith has been declared correct in terms of meaning and has been recorded in the books of hadith, biographies and interpretations and other subject books. In the article under review, the sayings of Imams on the health and weakness of Hadith Lawlāk have been presented and research analysis of the said Hadith has been done through simulation and rational arguments.

Miniaturized Reconfigurable Dielectric Resonator Antenna

The tremendous growth of mobile wireless devices in various form factors requires efficient, compact, and multi-function antennas, capable of providing high data rates at multiple application bands. Modern wireless devices incorporate a number of different antennas to provide services for cellular voice, video, data, Wi-Fi, and GPS connectivity, across multiple bands. High data rate requirements also demand the design of multiple input multiple output antennas in order to implement spatial multiplexing and diversity schemes. Reconfigurable antennas possess the ability to change their characteristics (frequency, pattern, polarization) as per application demand. Dynamic alteration of the radiation characteristics makes them a suitable candidate for multi-function, small size wireless devices, where the requirement of multiple antennas can be circumvented by a single reconfigurable antenna. Dielectric resonator antennas (DRAs) offer a number of benefits over the conventional conductor-based antennas. The advantages include high radiation efficiency, small size, and a versatility of feed mechanisms. Despite many benefits, however, the size of the DRA must be excessively miniaturized to make their integration feasible in wireless devices of small size and various form factors. The aim of this work is to devise some novel reconfiguration and simultaneous miniaturization techniques for DRA based antennas. Hybrid structures comprising of DR and other resonant structures (like microstrip patch, slots) have been explored previously for enhancement of impedance bandwidth, multi-band, and wideband applications. Hybrid antenna structures combine the desirable features of both resonators and are much beneficial to meet the diverse application demands. This work proposes a hybrid combination of DR element, with ground plane (GP) slots to design compact, efficient, and multi-function reconfigurable antennas. The reconfiguration properties of the proposed antenna structures satisfy multiple application band requirements, while the miniaturization aspects assist to save valuable space in small devices. The GP slots can either be employed as a resonant structure or act as a defected ground structure (DGS) for the resonant DR element. The proposed technique has been applied for the design of frequency reconfigurable (FR), single-input-single-output (SISO), multiple-input-multiple-output (MIMO), and frequency plus pattern reconfigurable antenna designs. A few novel designs are presented in the current dissertation that effectively combine the GP slots and the DR resonances to obtain efficient, multi-band, antenna structures for SISO as well as MIMO applications. The combination of probe-fed and microstrip line fed DR elements with GP slots has thoroughly been analyzed and designed with an emphasis to get higher tuning ranges and better isolation. In almost all designs, the reconfiguration aspect has been incorporated by placing switches on the GP slots, which in turn alter the slot length and result in achieving either frequency or pattern reconfiguration.